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Post by jlew2000 on Jan 11, 2024 14:11:59 GMT
Hi there, I have a 2000 Vespa px 125 with a 150cc top end and a sterling exhaust. I had a dellorto PHBH 28 on for a while but seemed too big so decided to put a PHBH 26 on instead. it runs and rides but doesn't seem to run as sweet as the 28 did. Any idea on what jets I require for either the 26 or 28?
Many thanks
Any advice much appreciated.
Jack
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Post by adrian on Jan 11, 2024 16:47:54 GMT
Personal I would go for a 24 si from a p200 with standard jetting and work from there
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Post by adrian on Jan 11, 2024 16:51:01 GMT
Had a 24 on the wife's 180 with sterling exhaust, just went up 1 or 2 with the main and between us we did some serious miles 1 and 2 up
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Post by shaunbond on Jan 11, 2024 20:15:10 GMT
Two things wrong in my opinion. 20mil carb is plenty for a low state of tune 150cc and a Stirling exhaust is a terrible match for the port timings of the cylinder. They are for high revving kits and even then they're not a very good exhaust.
You'll be much better off with a box exhaust which doesn't require high revs to make power.
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Post by gpowell on Jan 12, 2024 8:39:33 GMT
Two things wrong in my opinion. 20mil carb is plenty for a low state of tune 150cc and a Stirling exhaust is a terrible match for the port timings of the cylinder. They are for high revving kits and even then they're not a very good exhaust. You'll be much better off with a box exhaust which doesn't require high revs to make power. Absolutely agree with that. Stock 150 cant make the rev fir sterling pipe and big carb Some great box exhausts on the market, but i would suggest the SIPR2 and maybe consider a kit depending on what you want to achieve or some mild porting of the original cylinder |
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