Pwk 28 tuning for zs 155???? Need help!!!

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Dawson5567

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Hi I have a stock zongshen 155 that I am trying to tune a pwk 28 for. I was using a genuine mikuni vm 26 carb I’d bought off tbolt USA but the throttle response left something to be desired, so I thought I’d try a flat slide since this carb was given to me for free. Pretty sure the carb came off a ktm 85, so it’s a genuine keihin carb. I have a wide variety of jets and am just looking for a baseline to go from. I have a jjh needle main jets ranging from 100 to 120 and pilot jets ranging from 32 to 58. What would be the best combo to start with. I couldn’t find anything for a zs 155.
Thanks!!!
 

AntNZ

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on a stock 155ho i would try a 38pilot and 102-108 main to start with and that should get you running pretty good, then plug chops and general feel to fine tune...
hope this helps
 

Dawson5567

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on a stock 155ho i would try a 38pilot and 102-108 main to start with and that should get you running pretty good, then plug chops and general feel to fine tune...
hope this helps
Thanks so much for this I just saw this, I gave up on the bike last year because the season was over here I actually gave the carb to my brother who has a yx140 and he’s trying to tune it for his bike but I think it might just be too big. Any thoughts on this??
 

AntNZ

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yeah, too big for stock engine, i'd get an oko26 flatslide and put 38pilot and 102main in and should be good starting point
 

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