850T: Installed a big bore kit. Carb suggestions?

[Antietam Classic Cycle]

Don't like Black manifolds? Here's another way to skin the cat. They go from a 36mm intake and reduce down to 30mm at the head. You'll probably need some step studs.

https://www.officine08.com/p68647_intake-manifold-moto-guzzi-serie-grossa-carburetor-dell-orto-vhb-30-kit-conical-straight.html

I bought a set of the 40mm-36mm for my 850 Lemans engine. they are nice looking.

Another source (but also out of stock):
https://hmb-guzzi.de/Inlet-manifold-set-CNC-for-PHF-36-carbs-tapered

[Semitone]

What type of and where did you get a 1000cc kit for a T that didn't require rebalancing? I was told they all did.
Thanks, cause I have a T and was considering this.

I bought the kits from mgcycle. I think the manufacturer is Meteor. You will want to rebalance motor after installation if you want to maintain its balance factor. Fortunately for me, the balance factor was higher, about 55%, than I wanted with the original 850cc set up. The added weight of the new pistons brought the balance factor down to about 52.5%, close enough to my target of 52% so that I didn’t need to add any weight to counter balance.

[Semitone]

  When in doubt , refrain from small incremental changes in jetting . Go at least 2 to 3 sizes up ( or down) and
see if it improves , or gets worse , that should lean you in the right direction , excuse the pun . Also , a lot of
cams don't always respond well to full throttle at lower (under 4 grand ) revs , particularly in higher 2 gears !
Have fun , tuning is a true test of patience :) . Peter

Thanks for the suggestion! I think I might start with jet settings for an SP1000 and see where I’m at.

[frozengoose]

I bought the kits from mgcycle. I think the manufacturer is Meteor. You will want to rebalance motor after installation if you want to maintain its balance factor. Fortunately for me, the balance factor was higher, about 55%, than I wanted with the original 850cc set up. The added weight of the new pistons brought the balance factor down to about 52.5%, close enough to my target of 52% so that I didn’t need to add any weight to counter balance.

Thanks for the reply, what exactly did you have to do to modify this for the T? The MG ad says it's for a T3 but then has a note: "This kit is adaptable to other 850cc engines such as 850 Eldorado and 850T although some minor modification may be required to accommodate push rod tunnel locations.

[Semitone]

something to consider perhaps...

Intriguing. I actually have the room for the Weber. Methinks the cost of manifold for this carb would be more expensive than the carb itself!

[Antietam Classic Cycle]

The Weber is intriguing. Methinks making up a custom manifold would cost more that the carb itself!:)

Not to mention trying to jet it to work. Automobile carbs on motorcycles are rarely a good idea.

[Semitone]

Thanks for the reply, what exactly did you have to do to modify this for the T? The MG ad says it's for a T3 but then has a note: "This kit is adaptable to other 850cc engines such as 850 Eldorado and 850T although some minor modification may be required to accommodate push rod tunnel locations.

I didn't have to modify anything. No issue with the pushrod tunnels!

[frozengoose]

I didn't have to modify anything. No issue with the pushrod tunnels!

OK thanks Paul, food for thought, as they say...

[Turin]

Quote from: Turin on July 19, 2022, 03:27:31 PM
Don't like Black manifolds? Here's another way to skin the cat. They go from a 36mm intake and reduce down to 30mm at the head. You'll probably need some step studs.

https://www.officine08.com/p68647_intake-manifold-moto-guzzi-serie-grossa-carburetor-dell-orto-vhb-30-kit-conical-straight.html

I bought a set of the 40mm-36mm for my 850 Lemans engine. they are nice looking.

Hello again Turin. It’s more about the black Dellortos I don’t like, but thanks for link to the manifolds. I’m certainly going to need something like this when going to a bigger carb. Wonder if I’d be able to mate the Mikunis to this without too much fuss. P

Summit racing has a great selection of Mikuni Carbs, and the guzzi puch on rubber manifolds should work.
https://www.summitracing.com/search?SortBy=BestKeywordMatch&SortOrder=Ascending&keyword=mikuni%20vm

[Semitone]

Summit racing has a great selection of Mikuni Carbs, and the guzzi puch on rubber manifolds should work.
https://www.summitracing.com/search?SortBy=BestKeywordMatch&SortOrder=Ascending&keyword=mikuni%20vm

Thanks for the link Turin. It seems that the Mikunis do not come in L/H, R/H versions. Trying to figure out how adjustments are to be made with angled manifolds.

[Semitone]

Another source (but also out of stock):
https://hmb-guzzi.de/Inlet-manifold-set-CNC-for-PHF-36-carbs-tapered

Thank you for the link Charlie!

[guzzista]

I have LM 36mm manifolds. PM if interested

[Semitone]

I ran 38mm Mikuni flat slides on my big bore (950cc) , cammed T5.

G

Geoff, what did you use for intake manifolds? Also, since the TMs only come with right side idle screws, how are you adjusting the left carb?

[Kredge75]

Geoff, what did you use for intake manifolds? Also, since the TMs only come with right side idle screws, how are you adjusting the left carb?

Sorry to jump in here- when I ran Keihin copies I bought an extended mixture screw which is adjustable by hand. It has a large knurled head that sticks out and I could just get my hand in there and turn it with the tips of my fingers.

[Tony F]

Sorry to jump in here- when I ran Keihin copies I bought an extended mixture screw which is adjustable by hand. It has a large knurled head that sticks out and I could just get my hand in there and turn it with the tips of my fingers.

I have Mikunis on my SP1000. I managed to find a screwdriver around 500mm long which can reach through from the righthand side to adjust the left hand carb.

[geoff in almonte]

Geoff, what did you use for intake manifolds? Also, since the TMs only come with right side idle screws, how are you adjusting the left carb?

I dont remember.  I sold the T5 over 20 years ago.

G