Author Topic: Moto Guzzi Stelvio NTX Valve Adjustment Procedure  (Read 25439 times)

Offline leafman60

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Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« on: July 29, 2012, 10:28:51 PM »
This applies to both flat tappet and roller tappet engines. Begin procedure with engine cold, at room temperature.

Start by blowing all loose dirt or grime away before loosening any fasteners or parts.  This helps avoid debris finding its way into the internals.



Next,  pry out the little “Moto Guzzi” emblems.  This may take more effort than you’d think if you had good dealer prep.  My dealer mechanic had added some glue to the underside of the emblems to avoid the common problem of lost emblems.  I used a thin-blade utility knife as a prying tool and worked the emblem out.  You have to get it up and then pull it loose from the glue.  I know that I’m kinda anal sometimes but I applied blue tape so as not to mar the plug wire retainer when I pried out the emblem.



This is what the little emblem looks like from behind.  The blob of glue is in the background.  Once the embem is out, you remove the retaining screw and the small spark plug wire cover piece.



Next is removal of the spark plug boot from the plug. Much has been written about this and several people have mutilated a plug wire/boot trying to remove it from the plug.  The shop manual says to insert a screwdriver through the rear fin opening and pry the boot up.  This is easier said than done.  The throttle body and the injector kinda get in the way.

I discovered that I could grab the boot and rotate it left and right several times to break loose its seal to the valve cover.  Then,  by twisting it a bit further the shoulder of the boot rides up on the valve cover with the effect of pulling the boot off the plug.  Help it with your fingers and it comes right off.  You can also slip a nylon zip-tie or a piece of strong twine etc around the boot head and pull it off. These plug wires are sensitive to damage so be careful. Official procedure to remove caps is to insert screwdriver through head fins to pry up the boots from the bottom. Be careful not to cut the boots with this method. (See posting about upgrading spark plug boots to NGK.)



Then take a long socket extension and a thin wall socket to reach the spark plug.  This is the same size socket as used to remove the plugs on the current BMW boxers. I use a Duralast 16mm deep that I bought from Autozone Parts.  If the wall of the socket is too thick, the socket will not go down into the valve cover. 



My socket did not have a rubber retainer inside so, once the plug was loose, I removed it from the well with a telescopic magnet.



Next, remove the valve cover retaining bolts.  Rubber washers are under them.   



Then,  remove the plastic heat guard that covers the rear of the valve cover and lift away the valve cover.



Just look at those easy-to-adjust rocker arms.  Ducati people, eat your hearts out.



The valve cover gaskets are rubber and re-useable after wiping clean.



Now, we have to get the piston to top-dead-center on the compression stoke so that all valves will be closed and the rocker arms off the heel of the cam with the valve lash present.  You can manually turn the rear wheel with the transmission in gear or you can put a 24 mm socket on the front crank nut.
 
First, pry off the rubber plug on the front of the engine to reveal the nut.  Then use the socket and ratchet to turn the engine.



There are marks on the flywheel, as with most Guzzi models, to indicate when each piston is at TDC but they are not as obvious as on the older engines.  You may want to paint a white mark on the flywheel once you have the proper TDC position.  First, remove the rubber plug on the rider’s right side behind the motor.



Another way to find TDC, upon which I relied, is to insert something soft like a soda straw into the spark plug hole to rest on top of the piston and move with the piston.  You just turn the engine with the wrench and watch the soda straw until it shows the piston reaching the top of its stroke. 

On the anal side, I like to come to rest at TDC as the crank would normally turn and not “back it up” to rest at my adjustment point. The theory here is to have the cam chain taut and not let any cam chain slack interfere with your adjustment points.  The engine crank turns in a clockwise direction if you are standing in front of the bike and looking back at the front of the motor.  Looking in the flywheel peephole, the normal direction of rotation would show the flywheel moving upward.

Remember  that you want the piston at TDC on the compression stroke.  You can watch the valves to figure this out.  When the piston comes to the top and all four valves are closed, that’s what you want.  You can verify this by grabbing the rockers and shaking them.  You’ll feel them a little loose.  You can also double-check by looking for the flywheel mark.



Before using the feeler gauges to check the lash, I like to squirt a little cleaner solvent (brake cleaner etc) on the lash joint to clean-out any oil that may interfere with a good gauge feel.  After completing the valve adjust, squirt a little oil back into the valve lash gap.   Intake is .006 inch, .15 mm.  Exhaust is .008 inch, .20mm.



The intake valves are on the rear, near the intake.  Exhaust valves are on the front where the exhaust pipe is.
 
This is a procedure held over from my many years of BMW valve adjusting.  BMW recommends checking clearances with two feeler gauges at once.  The theory is that slop in the rocker shaft can alter your readings so you want to insert a feeler gauge on both valve trains to take out such free play.  I don’t know if it’s worth the trouble but I am used to doing it.
 
You still check and adjust each valve separately but you do so with a feeler gauge on the other valve while you’re doing it.  You can also try to bridge one feeler gauge blade across both valves.



Now, we do the exhaust.   So simple.  Loosen the lock nut, adjust the allen stud. You do have to play with it.  When you tighten the lock nut, your clearance may change a wee bit due to pulling the slack out of the threads.  You’ll have to back it off and work it until you get what you want after tightening down the lock nut. Play with it and you’ll get it correct.  You want a slight drag on the feeler gauge.  If you are in doubt, take the next size up feeler gauge and see if it will go in your gap.  If it does, you had them too loose.  Of course, remember-  too loose, is better than too tight.



Another look at the exhaust side after we have adjusted both valves to proper spec.



After one cylinder is completed, you move to the other side and repeat the procedure outlined above.  Get the piston to TDC and be sure all valves are closed and you can feel slack in the rockers that you’ll be adjusting.

In keeping with being very detailed, I like to squirt a little oil back into the adjusted joints after the lash adjustment is completed.
Wipe the valve cover gaskets clean and replace them on the cylinder head.



Before replacing the spark plugs, examine them.  Clean or replace if necessary.  Guzzi uses the twin point plugs like BMW.  I like to dab a wee bit of anti-seize compound on the threads.



Insert the plug into the well with your plug socket or, as shown here, the extension magnet.  Torque plug to specs.



I like to lube up the interior and exterior of the plug boot with some dielectric grease to ease that boot removal procedure we discussed at the beginning.



Position the valve cover on the head.



After replacing the  plastic heat guard,  rubber washers, valve cover screws,  and the spark plug wire cover, add a dab of silicone or some sort of glue to hold down that little MG emblem and re-insert the emblem.



That’s all there is to it.




« Last Edit: March 09, 2017, 08:10:43 AM by leafman60 »

Offline guzzisteve

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #1 on: July 29, 2012, 10:57:45 PM »
Nice write up, I'm the one who put Super Black on your emblems not the factory.
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Offline leafman60

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #2 on: July 29, 2012, 11:55:17 PM »
Lol, you sonofagun !

If I didn't live so far from you, you'd be doing this, ya know !

By the way, everything was consistent and about 1 thou on the loose side for all 8 valves. 
« Last Edit: July 30, 2012, 12:00:46 AM by leafman60 »

sceptick

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #3 on: July 30, 2012, 03:18:35 AM »
I understand the gap clearances are 6 and 8 for the 2012 NTX instead of 4 and 6 as the manual download from Guzzitech says? I'm getting prepared to do my first valve adjust for the new Stelvio NTX I bought last week.

Thanks for posting this excellent step by step procedure, and the pictures are very good.

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #3 on: July 30, 2012, 03:18:35 AM »

geeseman

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #4 on: July 30, 2012, 05:34:53 AM »
Now the big question is it still a flat tappet valve train as oppose to some it Europe who insist the new Stelvio's have a roller tappet valve train.

Excellent work there David !
« Last Edit: July 30, 2012, 05:39:37 AM by geeseman »

Vasco DG

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #5 on: July 30, 2012, 06:17:56 AM »
Now the big question is it still a flat tappet valve train as oppose to some it Europe who insist the new Stelvio's have a roller tappet valve train.

Excellent work there David !

I've only heard one anecdotal story of some Stelvios having the roller tappets.

If you look at Davida pics and then compare the cam boxes with those on my 8V posted up on Guzzirech you can clearly see the differences, including what for all the world look like guide marks for boring bigger holes for the roller tappet assemblies cast into the top of the camboxes.

Does this mean anything? Who knows? My guess is that the new Cali 1400 will be launched with considerable fanfare and much will be made of the roller tappets and twin plugs. Before anyone starts 'Woe is me-ing' though I think it has now been adequately proven that if you do the right thing by the flat tappet motors they are every bit as reliable as their predecessors.

I remain convinced that the motors that failed AFTER the initial batch of questionable tappets have done so through ignorance and neglect rather than there being any question of 'Fragility'. Do bear in mind though that my sample group is fairly small. Having said that 'Flat Tappet' Grisos and Stelvios from 'Reputable' dealers in most markets seem to work fine. Ones sold by 'Push 'em out the door with a 'Concrete Warranty' mobs seem to fare less well....

VDG

Offline leafman60

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #6 on: July 30, 2012, 06:58:53 AM »
I understand the gap clearances are 6 and 8 for the 2012 NTX instead of 4 and 6 as the manual download from Guzzitech says? I'm getting prepared to do my first valve adjust for the new Stelvio NTX I bought last week.

Thanks for posting this excellent step by step procedure, and the pictures are very good.

Thanks all.

Yes, my current shop manual and all recent data call for the 6 and 8 settings on the Stelvio.  This was the first adjustment on this bike with about 950 miles on it. 

All eight valves were about exactly the same but rather than .006 inch and .008 inch, they were approximately .007 inch intake and .009 inch exhaust.  Maybe that was on-purposed to allow initial break-in settling.  I adjusted everything to spec.  The bike runs like a scalded dog.
« Last Edit: August 18, 2022, 09:20:50 PM by leafman60 »

Offline roofus

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #7 on: July 30, 2012, 07:26:09 AM »
Nice photography! Clean and crisp close ups! What camera did you use?
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Offline leafman60

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #8 on: July 30, 2012, 07:47:57 AM »
Cheap Canon pocket camera!

Those sharp pictures also show all the dirt on my bike!

Offline guzzisteve

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #9 on: July 30, 2012, 11:52:31 AM »
Leaf,   I knew you would take care of it, service. Hope it is acting ok for you.
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SS Twin

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #10 on: July 30, 2012, 05:02:48 PM »
Leafman, excellent write up and pics, as others have said. Thanks for sharing!   ;-T

Offline Luap McKeever

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #11 on: July 30, 2012, 05:59:13 PM »
Awesome write up and nice photos ;-T.  I would love to see more of this take place on other tasks as well.

I did learn something from it too...I would have adjusted my valves to the same tolerances as the '09, but now I know better.

Good job.
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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #12 on: July 30, 2012, 06:34:40 PM »
Awesome write up and nice photos ;-T.  I would love to see more of this take place on other tasks as well.

I did learn something from it too...I would have adjusted my valves to the same tolerances as the '09, but now I know better.

Good job.


I would verify that for your 09 Luap, The rockers and cam box has been redesigned  for the 2013 model 8V

Paging GuzziSteve or Mr. Vasco

Offline Luap McKeever

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #13 on: July 30, 2012, 08:39:59 PM »

I would verify that for your 09 Luap, The rockers and cam box has been redesigned  for the 2013 model 8V

Paging GuzziSteve or Mr. Vasco

I dont have the 09 anymore ;D, I traded it for the 12. that's what's good to know is that I wont set them on the 12 as I did on the 09.  Glad you pointed it out before I did it.  Guess it helps to read the manual  ;D
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Offline mtwillyman

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #14 on: July 30, 2012, 08:40:08 PM »
Thanks for the excellent tutorial Leafman! Well done.
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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #15 on: July 30, 2012, 09:00:49 PM »
Thanks for the writeup!  We need more of this on WG!   ;-T
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Offline Nick

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #16 on: July 30, 2012, 09:14:57 PM »
Thanks for the show and tell. I'm bookmarking this one.

Offline drw916

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #17 on: July 30, 2012, 09:52:35 PM »
Below and forward of the dipstick is an engine number that starts with either A5, or A8.

A5's are set at .10 intake.  .15 exhaust

A8's are set at .10 intake.  .20 exhaust

My 2010 is an A8

This is per the Stelvio service manual so I sure hope it is correct.
« Last Edit: August 06, 2012, 05:37:44 PM by drw916 »
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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #18 on: November 24, 2014, 08:43:14 AM »
I just wanted to say thanks to Leafman60 for this procedure.
I couldn't find a good procedure with my search in the shop manual and this really helped yesterday.
The straw method for find TDC worked awesome.

All the valves were tight on my Stelvio on this 6250 mile service.

Also went iridium spark plugs and swapped out the spark plug boots per another article by Leafman60.

Anyways, today I am thankful for the time that you put this together.

thanks again, Andrew.

Offline leafman60

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #19 on: November 24, 2014, 08:50:54 AM »
I just wanted to say thanks to Leafman60 for this procedure.
I couldn't find a good procedure with my search in the shop manual and this really helped yesterday.
The straw method for find TDC worked awesome.

All the valves were tight on my Stelvio on this 6250 mile service.

Also went iridium spark plugs and swapped out the spark plug boots per another article by Leafman60.

Anyways, today I am thankful for the time that you put this together.

thanks again, Andrew.

You are very welcome, Andrew.  Just like many others on here, all I try to do is help others with my own experiences.

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #20 on: November 24, 2014, 09:47:59 AM »
Thanks Leafman for sharing this. I wish I had witnessed this before I buggered up my factory plug boot. I was very gentle with it but still managed to split the insulation at the top bend. Live and learn. I purchased replacement ngk's but they do not seem to have the same seals as the originals. I am inclined to order factory replacements as they look to have a better seal design . Certainly with all the concerns recently with tappet failures we all will be keeping a close eye on valve lash clearances. Your step by step tutorial will be appreciated by many. Dave

Offline leafman60

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #21 on: November 24, 2014, 12:57:56 PM »
Thanks Leafman for sharing this. I wish I had witnessed this before I buggered up my factory plug boot. I was very gentle with it but still managed to split the insulation at the top bend. Live and learn. I purchased replacement ngk's but they do not seem to have the same seals as the originals. I am inclined to order factory replacements as they look to have a better seal design . Certainly with all the concerns recently with tappet failures we all will be keeping a close eye on valve lash clearances. Your step by step tutorial will be appreciated by many. Dave


Lucian, if you look at my postings about the NGK plug caps, I describe how the proper NGK seals come on another NGK cap besides the one appropriate for the Stelvio. Just buy a couple of those other NGK caps with the correct size seals, remove the seals and install them on the NGK caps that fit the Stelvio. They make a tight seal to the spark plug insulator.

I included pictures of all that.

Look here-


http://wildguzzi.com/forum/index.php?topic=61267.40

.

« Last Edit: November 25, 2014, 06:03:41 AM by leafman60 »

Offline Calimero

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #22 on: November 24, 2014, 02:15:14 PM »
Hey, I can use this. My first do it yourself valve adjustment is coming up. ;-T
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Offline brlawson

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #23 on: November 24, 2014, 06:34:50 PM »
Waiting to see the pics on that one.  :pop
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Offline brlawson

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #24 on: November 24, 2014, 06:40:41 PM »
David,

I wish I had seen your fancy 2 gauge setup before before I spent the big bucks on a pair of the BMW setup

http://www.beemerboneyard.com/wurthairhead.html


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Offline leafman60

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #25 on: November 24, 2014, 08:02:53 PM »
David,

I wish I had seen your fancy 2 gauge setup before before I spent the big bucks on a pair of the BMW setup

http://www.beemerboneyard.com/wurthairhead.html




Those are Wurth brand feeler gauges and are well known, especially in the BMW world.

To make a double gauge like I use, just rivet two individual gauges together. You don't have to connect the two feelers but I find it helpful.

Not everybody uses that set-up but it is stressed in the BMW service manuals as the best way to get the clearances more perfect on two-valve rockers like the BMW and the 8V Guzzi. The theory is that any slack in the rocker arm can alter the final clearances on individual valves when adjusted with a single feeler. Using twin feelers helps hold the rocker steady while you set the clearances on both valves.

I really don't know if it's the best way but I've done it that way for years of working on BMW 8V motors.
« Last Edit: November 25, 2014, 05:11:55 AM by leafman60 »

Offline jacksonracingcomau

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #26 on: November 24, 2014, 11:54:48 PM »
I've only heard one anecdotal story of some Stelvios having the roller tappets.

IBefore anyone starts 'Woe is me-ing' though I think it has now been adequately proven that if you do the right thing by the flat tappet motors they are every bit as reliable as their predecessors.

I remain convinced that the motors that failed AFTER the initial batch of questionable tappets have done so through ignorance and neglect rather than there being any question of 'Fragility'. Do bear in mind though that my sample group is fairly small. Having said that 'Flat Tappet' Grisos and Stelvios from 'Reputable' dealers in most markets seem to work fine. Ones sold by 'Push 'em out the door with a 'Concrete Warranty' mobs seem to fare less well....

VDG


However, since then it's all changed a bit


I just wanted to say thanks to Leafman60 for this procedure.


All the valves were tight on my Stelvio on this 6250 mile service.
.

Any comment on tight valves,  Pete ?

Offline Wayne Orwig

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #27 on: November 25, 2014, 12:18:23 AM »
David,

I wish I had seen your fancy 2 gauge setup before before I spent the big bucks on a pair of the BMW setup

http://www.beemerboneyard.com/wurthairhead.html





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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #28 on: November 25, 2014, 12:19:45 AM »
No why would I? I have no knowledge of this particular bike or its servicing.

As for the first quote? It is over two and a half years old and like all observations is subject to revision and re-examination in the light of further events. Problem?

Pete

Offline leafman60

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Re: Moto Guzzi Stelvio NTX Valve Adjustment Procedure
« Reply #29 on: November 25, 2014, 05:10:38 AM »

You can get a few feet of shim strips in about any thickness for a few pennies from McMaster Carr.


Or you can go down to your local auto parts store and buy a relatively inexpensive, high-quality set of feelers that are already die-cut for ease of use.  
« Last Edit: November 25, 2014, 05:20:31 AM by leafman60 »

 

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