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Help jetting trinity stage 4 single carb pwk 38mm


jimmy2450

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  • 1 month later...

The single carb sort of isolates where your problems can be.  I will offer a few tips to help. 

 

1.  Swap the plug wires L and R.  If the problems still exist on the R cylinder, the electronics are not your problem, move on.  Assuming you have fresh plugs.  

 

2.  the leak down test should be performed and should easily show the culprit if this is air leak related.  

 

3.  PORTING!  I have seen this before.  If those cylinders are ported, you may very well have ports that do not match, thus one side wants different jetting than the other.  This becomes a port correction job.  

 

4.  REEDS!!!  This is probably one of the very first things I would have looked at.  If the pedals are damaged or not seating, when the piston goes down, proper crankcase compression cannot be built up, thus depriving the top side of fuel/air.  Though most people do not follow proper practice, fiber reed pedals should be flipped periodically to ensure they seal correctly.  

 

Above all, I would NOT be chasing jetting at this point with a single carb.  If you have one cylinder running good, and the other one not, that is not jetting.  There is something different between the two sides.  Only once you find that culprit will you be able to properly jet it.  

 

 

Brandon

Mull Engineering

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