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 Post subject: 32mm jetting.
PostPosted: Tue Nov 07, 2017 4:07 pm 
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Expert racer
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Joined: Wed Oct 13, 2010 2:55 pm
Posts: 1223
Location: Southeast England
Country: England
Bikes owned: TS100, T200, GT250, T500, GT500, GT550, GT750, GS750
If you have an early T500, (1970), with 32mm carbs, is there any reason why you can't remove the round 150 main jet, and replace it with the later 97.5?

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 Post subject: Re: 32mm jetting.
PostPosted: Tue Nov 07, 2017 11:04 pm 
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Moto GP
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Joined: Mon Nov 03, 2008 10:47 am
Posts: 5841
Location: Illinois
Isn't the first generation of 32mm carbs "homopressure". If so, they are jetted quite differently because of the different float bowl pressure compared to regular VM type carbs and it's pressure differential between the venturi and float bowl that pushes fuel onward and upward.


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 Post subject: Re: 32mm jetting.
PostPosted: Wed Nov 08, 2017 12:22 pm 
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Joined: Wed Oct 13, 2010 2:55 pm
Posts: 1223
Location: Southeast England
Country: England
Bikes owned: TS100, T200, GT250, T500, GT500, GT550, GT750, GS750
Thanks for the response TZ...
I have zero experience with these early model 32s. Are jets available in increments of 2.5 like the later ones?, and what are people changing up to when running chambers and pods?

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 Post subject: Re: 32mm jetting.
PostPosted: Wed Nov 08, 2017 4:14 pm 
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Road race school
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Joined: Wed Jan 18, 2012 8:01 pm
Posts: 869
Location: North of Albany, NY
Country: USA
Bikes owned: T500R (now), T500M (30 yrs ago)
'72 and older have the homo-pressure carbs, with the bowl vented at the mouth of the intake. '73 and newer have standard carbs, with the bowl vented to atmosphere.

The older carbs need the larger 150 Main Jet. Even when mated to a '73 or later engine.

The large round Main Jets are available in 2.5 increments.


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