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PostPosted: Tue Oct 23, 2018 8:37 pm 
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On the street

Joined: Fri Jul 05, 2013 10:07 am
Posts: 29
Country: U.S
Bikes owned: '75 GT750, '73 Norton...yeah I know, not here
Hi 'yall,

it's been a while...

I'm in the middle of converting my CV bike to VM carbs. so far everything is going as planned except the throttle housing... going from push pull to pull only the entire housing moves back. I've tightened the 2 screws on the housing as tight as possible and it still moves. Am I missing something? has anybody had this problem? do I need to wrap the bars with tape to get stronger clamping strength? Is there something in the earlier throttle housing that the later models don't have?

Any advice or info would be greatly appreciated.

Mario


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PostPosted: Mon Nov 05, 2018 10:35 pm 
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Moto GP
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Joined: Mon Nov 03, 2008 10:47 am
Posts: 6006
Location: Illinois
You could split the throttle housing and file a small amount off the split so that it tightens better. Better to get a 72/72 single pull throttle though - IIRC the drum is larger so allows less rotation to fully open the carbs and if you are using larger than 32/34 you will need an aftermarket throttle housing. Otherwise it would be hard to get them fully open


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PostPosted: Wed Nov 07, 2018 7:07 am 
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AMA Superbike
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Joined: Tue Oct 14, 2008 6:47 pm
Posts: 1725
Location: Blythewood, SC, USA
I used a Tommaselli quick-turn on mine.

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If you stroke it more than twice; you're playing with it.

Too many bikes, too much time, ENOUGH SPACE, FINALLY! Never enough money.........


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PostPosted: Wed Nov 07, 2018 8:46 am 
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Around the block

Joined: Thu Dec 05, 2013 12:32 pm
Posts: 84
Country: Austria
Bikes owned: GT750
I am using VM34 on my BIMOTA kettle with a Kawasaki Z900 throttle control / switch gear, and the original 72 GT750 cable splitter. The force required to open the slides is considerable, it is quite demanding, much stronger as with the VM carbs. How was this adressed with the early VM32 carbs in ´72 kettles?


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PostPosted: Wed Nov 07, 2018 8:46 am 
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Around the block

Joined: Thu Dec 05, 2013 12:32 pm
Posts: 84
Country: Austria
Bikes owned: GT750
I am using VM34 on my BIMOTA kettle with a Kawasaki Z900 throttle control / switch gear, and the original 72 GT750 cable splitter. The force required to open the slides is considerable, it is quite demanding, much stronger as with the VM carbs. How was this adressed with the early VM32 carbs in ´72 kettles?


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PostPosted: Sun Nov 11, 2018 11:51 am 
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Road race school

Joined: Wed Jul 10, 2013 12:04 pm
Posts: 829
Country: England, UK
Bikes owned: FZ50, GP100, RG125 Gamma, GT380, Bandit 1200S
I noticed similar on my GT380. Very tough springs on the carbs. Was thinking of putting an assisting spring on the lever.


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