Author Topic: loop frame throttle splitter delete?  (Read 960 times)

Offline DodgeBoy

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loop frame throttle splitter delete?
« on: February 22, 2024, 02:09:17 AM »
Hi,

my 72 Eldo has the factory setup where the Tommaselli single throttle cable gets divided by the cable splitter under the gas tank. I allready had the splitter disassembled, cleaned and greased but it seems I still have some issues with the intended free play on the carbs swaps beteween okay and getting to tight. I can only assume it has to do with the splitter being a fiddly thing?

Is it worth it to delete that throttle splitter by using a dual cable throttle setup? Plus i allways have the feeling that the short throttle cables from carb to splitter are way to tight pressed under the tank causing them to get rubbed blank at the lower tank seam...
1972 Moto Guzzi 850 Eldorado Police

Offline Paul_Tim

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Re: loop frame throttle splitter delete?
« Reply #1 on: February 22, 2024, 04:24:19 AM »
Not on a Guzzi but I've run both options on my '72 Triumph Bonnevile at one time or another over the past 30 years, can't say I've ever noticed a difference.

Offline Scout63

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Re: loop frame throttle splitter delete?
« Reply #2 on: February 22, 2024, 07:54:49 AM »
I used this throttle for my G5 rebuild.  Easy install but getting cables the right length with the right fittings was tricky for me.  I ended up refitting cables by cutting and soldering on new throttle ends. Splitters are a pain but verbal easier for me.

https://www.mgcycle.com/index.php?main_page=product_info&products_id=739
Ben Zehnder - Orleans, MA USA

Offline Antietam Classic Cycle

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Re: loop frame throttle splitter delete?
« Reply #3 on: February 22, 2024, 08:45:23 AM »
Hi,

my 72 Eldo has the factory setup where the Tommaselli single throttle cable gets divided by the cable splitter under the gas tank. I allready had the splitter disassembled, cleaned and greased but it seems I still have some issues with the intended free play on the carbs swaps beteween okay and getting to tight. I can only assume it has to do with the splitter being a fiddly thing?

Is it worth it to delete that throttle splitter by using a dual cable throttle setup? Plus i allways have the feeling that the short throttle cables from carb to splitter are way to tight pressed under the tank causing them to get rubbed blank at the lower tank seam...

Going with a 2C throttle is a good "upgrade" if you want to get away from the splitter. You'll also need "flip chokes" for on the carburetors. If you have to buy a new 2C and cables, you're looking at over $100 though - only you can answer if it's "worth" it.
Charlie

Wildguzzi.com

Re: loop frame throttle splitter delete?
« Reply #3 on: February 22, 2024, 08:45:23 AM »

Offline DodgeBoy

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Re: loop frame throttle splitter delete?
« Reply #4 on: February 22, 2024, 09:02:45 AM »
Thanks guys.

I just had an option to buy a rare NOS Tommaselli SuperPratic 2C throttle online. It is the dual version of the orignally used SuperPratic B that is installed on my bike right now so it is kind of a period correct modification one could say. It was not that cheap though...  :weiner:








Good thing is I am soldering my own cables from time to time so I can make them to the right dimensions.

Thanks for the hint with the manual flip chokes. I will think about if I wanna delete the the splitter completely or leave the choke splitter in... barely touching the choke tbh.
1972 Moto Guzzi 850 Eldorado Police

Online pehayes

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Re: loop frame throttle splitter delete?
« Reply #5 on: February 22, 2024, 10:31:51 AM »
My 73 Eldorado was converted to a Tomaselli dual cable throttle.  I kept the splitter and cables for choke activation.  Doing regular throttle balance maintenance is a whole lot easier with the double cable system.  Adjustments are up at the hand mechanism.

Patrick Hayes
Fremont CA

Offline bigbikerrick

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Re: loop frame throttle splitter delete?
« Reply #6 on: February 23, 2024, 01:39:43 PM »
On my 73 eldorado, I also installed a 2C throttle, and got rid of the splitter. I also installed a "tonti type" choke lever. Its much easier for me to balance the carbs, with the two adjusters up by the throttle. The dual super practic looks cool! I never knew they made that.
Rick.
"You meet the most interesting people on a Guzzi"

Offline cliffrod

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Re: loop frame throttle splitter delete?
« Reply #7 on: February 23, 2024, 02:34:45 PM »
Thanks guys.

I just had an option to buy a rare NOS Tommaselli SuperPratic 2C throttle online. It is the dual version of the orignally used SuperPratic B that is installed on my bike right now so it is kind of a period correct modification one could say. It was not that cheap though...  :weiner:








Good thing is I am soldering my own cables from time to time so I can make them to the right dimensions.

Thanks for the hint with the manual flip chokes. I will think about if I wanna delete the the splitter completely or leave the choke splitter in... barely touching the choke tbh.

Please report back about your results with the twin cable Superpractic throttle.  I assume it’s like a single cable Superpractic throttle with the chain assist (yours would likely have two chains) that is original equipment on many Ducati singles.   

On those bikes, it’s pretty common to change those to a simplified Daytona throttle for regularly ridden bikes.  As the chain ages and degrades in a SuperPratic, the throttle action can suffer.  Sticky throttles are not cool…
1973 V7 Sport  "Now THAT'S a motorcycle!"-  Master Sculptor Giuliano Cecchinelli
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Online Tom H

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Re: loop frame throttle splitter delete?
« Reply #8 on: February 23, 2024, 02:38:16 PM »
Not fun when the pin in the chain brakes at the cup for the ball on the cable. A paperclip got me home.

Tom
2004 Cali EV Touring
1972 Eldo
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1973 R75/5 SWB with Toaster
2007 HD Street Bob
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Offline DodgeBoy

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Re: loop frame throttle splitter delete?
« Reply #9 on: February 26, 2024, 04:47:15 AM »
Yes I let you know but it will take a few days.

The 1C SuperPratic on my bike is quite old thats why i inspected the chain once. It has some play but the links seemed to be firm. But yes it might be a critical component.

As the chain ages and degrades in a SuperPratic, the throttle action can suffer.  Sticky throttles are not cool…
Not sure what you mean with sticky. If the chain brakes the carbs loose throttle... Not pleasent by any means but i don't think it would cause an accident. Or did you mean if only one brakes on a 2c setup?

What i am wondering: some 2c twistgrips have cable adjustment screws right on the grip. The SuperPratic doesnt have these. Do i need to install some or will the setup screws on the carbs be enough?
1972 Moto Guzzi 850 Eldorado Police

Offline Antietam Classic Cycle

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Re: loop frame throttle splitter delete?
« Reply #10 on: February 26, 2024, 08:31:55 AM »
Yes I let you know but it will take a few days.

The 1C SuperPratic on my bike is quite old thats why i inspected the chain once. It has some play but the links seemed to be firm. But yes it might be a critical component.
Not sure what you mean with sticky. If the chain brakes the carbs loose throttle... Not pleasent by any means but i don't think it would cause an accident. Or did you mean if only one brakes on a 2c setup?

What i am wondering: some 2c twistgrips have cable adjustment screws right on the grip. The SuperPratic doesnt have these. Do i need to install some or will the setup screws on the carbs be enough?

As long as the chain(s) are kept lubed, chain breakage on the Superpratic throttles isn't an issue IMO. The one on my '69 Ambo has 111k miles on it and is still in great condition.

The "big" 2C uses cables that have an elbow and adjust at the top, they're not on the throttle itself.







When fitting a non-standard throttle, cables can be an issue.
Charlie

Offline paulbricey

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Re: loop frame throttle splitter delete?
« Reply #11 on: February 26, 2024, 03:43:11 PM »
I have Twin Pull Tommaselli 2C on V50 III. It was pretty cheap at 66 GBP in 2019 & I made the cables with Venhill kit & added adjusters at the top to make it easy. Choke is the classic splitter based lever mounted down next to LHS intake - only needs about 30 seconds even when really cold.



« Last Edit: February 26, 2024, 03:44:57 PM by paulbricey »
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Online Tom H

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Re: loop frame throttle splitter delete?
« Reply #12 on: February 26, 2024, 04:25:35 PM »
If I was you. For the choke cables. Look at the pic in this ad on Ebay, MG Cycle I think sells the lever and housing. Do your research for prices:

The link was too long and mess with this page. Search for this:
Moto Guzzi 1000 California II 2 VT 1982 - choke cables choke lever A1081


MG Cycle no body clamp and you will need the cables.
https://www.mgcycle.com/index.php?main_page=product_info&cPath=135&products_id=695

As mentioned just get the Tommaselli 2C from MG cycles. Also get the cables from them for either civilian or police bars.

Tom
« Last Edit: February 26, 2024, 04:27:59 PM by Tom H »
2004 Cali EV Touring
1972 Eldo
1970 Ambo V1000
1973 R75/5 SWB with Toaster
2007 HD Street Bob
1953 Triumph 6T (one day it will be on the road!)

Offline John A

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Re: loop frame throttle splitter delete?
« Reply #13 on: February 27, 2024, 09:59:36 AM »
For the choke lever I used one of these https://www.ebay.com/itm/275463177852
I like the original choke on my Ambassador so I retained the splitter and used it for only the choke. I also put a spring inside the splitter to put tension on the cables so with a gob of freeplay the ends of the choke cables wouldn’t come out of their sockets when the choke was off. I see the one I linked to is for a one inch bar but there are similar ones for a 7/8” bar.
« Last Edit: February 27, 2024, 10:02:18 AM by John A »
John
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Offline DodgeBoy

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Re: loop frame throttle splitter delete?
« Reply #14 on: March 08, 2024, 05:17:00 AM »
For those of you who are interested and since that 2c SuperPratic-B twist grip seems to be quite rare: That is the breakdown of the NOS one I just got. The screw in type cable ends were still in the chain ends so I suppose you can say it was never installed or fiddled around with... I just had to clean it because all the grease was hardned up after around 50 years in storage.





Unfortunatelly the seller did not mention that he does not have the second rubber grip with the twist grip. It is sad because I really like the haptics. Its much better than the ballon type "Granturismo" grips and a bit harder than the waffle type grips from the other earlier Moto Guzzis (and they look nicer imho). I would love to get the missing left hand grip... does someone know where to get one or how they are called? Its marked with AR-021. Since the Granturismos show 004 I assume the number represents the series?

I am still not sure if I will go with adjustment screws on the twist grip side or if the adjustment screws on the carbs will be enough... Since I will make my own pair of throttle cables I ll get sure they measure the exact same lenght...so maybe one adjustment side would be okay?
1972 Moto Guzzi 850 Eldorado Police

Offline huub

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Re: loop frame throttle splitter delete?
« Reply #15 on: March 08, 2024, 08:51:35 AM »
Not fun when the pin in the chain brakes at the cup for the ball on the cable. A paperclip got me home.

Tom

i rebuilt one with the chain from a sturmy archer 3 speed bicycle cable

 

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