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Post by swedishguy on Oct 1, 2021 21:15:57 GMT
Hey guys, I have recently heard that the VHST main jet needs to be higher than the PHBS. Is this true?
If so, I have a setup where I know many people run 125-130, with the phbs 26mm, how much higher should I go with the VHST?
Does it only concern the main jet?
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Post by henri on Oct 2, 2021 7:16:09 GMT
ive found flatslide carbs versus round slides use a slightly larger main ,an slightly smaller pilot ,so long as the venturi size is the same .as in say a 26 roundslide to a 26 flatslide .H
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Post by swedishguy on Oct 2, 2021 8:00:44 GMT
ive found flatslide carbs versus round slides use a slightly larger main ,an slightly smaller pilot ,so long as the venturi size is the same .as in say a 26 roundslide to a 26 flatslide .H Okay this is good information to know👍I’ve got a VHST 26, and I was trying 145 main jet and I know the PHBS 26 use 125-130 to same setup…. and when I go full throttle 1 gear I cant hear it go rich. What would be a good main jet to try next? 160, 170? Seems like a big difference from the round carb but maybe it’s normal. I also got a friend who has a 24 TM and similiar setup, it’s a smaller carb and different brand. Would I make sense to try convert his jetting to mine to get a starting point? I know about the mikuni cc and doll mm |
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Post by tzsteve on Oct 2, 2021 22:40:15 GMT
funny thing about carb jets is that they have different ways of measuring the size.
delorto and webber sizes are measured in mm at the narrowest point
ie 135=1.35mm
& 150=1.50mm
& 200=2.00mm etc etc
amal measure the flow in thimblefulls per minute at a standard preasure
the jap carbs can be measured in cc flow per minute at a standard preasure
or the diameter of the jet at the narrowest point depending on the make and model of carb
mix and match is not always a sane way to go
TM i guess is a variant on the mikuni TMX so jet size would have
no relationship to dellorto stuff
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Post by jbcollier on Oct 3, 2021 0:52:43 GMT
Get a range of mains and jet it properly. I always go until it’s just too rich and then go from there.
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Post by jonnysnatchsniffer on Oct 30, 2021 12:22:18 GMT
throw it away and get a keihin pwk, you wont regret it
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