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Old 11-25-2017, 06:17 PM   #1
HawkTwoFifty   HawkTwoFifty is offline
 
Join Date: Oct 2017
Posts: 93
VM26 Mikuni Clone Carb Air/Idle Screw Adjustment

So I just swapped out my stock carb on my Hawk 250 for a new VM26 Mikuni clone and am having an issue with the idle being way too low. My VM26 carb didnt come with any tuning instructions or manual so I am unsure which screw on the carb would require adjustment for increasing my idle. I searched online for answers but am still unsure what screw requires adjustment. With this being a Mikuni clone carb, I am finding it difficult to find answers or guides online for tuning this carb.

Before installing this new VM26 carb, I replaced the main jet to a 110, replaced the pilot jet with a 25, and put the clip on the needle 2 clicks up from the very bottom (pointed side) of needle. With the carb installed, I just took it out for a ride and in addition to the very low idle (will definitely stall without throttle), there seems to be a total lack of acceleration within the range of 1/4-1/2 throttle. So I couldnt get the bike over 30mph during my test run today. Every time I pulled the clutch in the bike would stall out so I know for sure that the idle requires adjustment but know that there must also be another issue since I have no midrange power.

Any help would be appreciated. Also, is there a Mikuni carb manufactured which is very close to be similar to this carb that I could use as a reference? When I look up a genuine VM26 Mikuni carb, there are definite differences between the two. If I could find a Mikuni carb which is nearly identical to this carb, than I would be able to find the info that I need. I just havent found such info yet. Any help is greatly appreciated, THANKS!!


 
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