Jraz Posted June 30, 2012 Report Share Posted June 30, 2012 So my first shee build , have a 4 mill, 65.5 bore, fmf pipes, mild porting, uni filter, stock carbs at about 530 elevation. Seems to Idle well not much color on plugs but some. Boggs at around 1/2 throttle and hits like a mofo. Any suggestion would be appreciated. Thanks Quote Link to comment Share on other sites More sharing options...
thomas h. Posted July 1, 2012 Report Share Posted July 1, 2012 320-330 mains 25 pilot mid clip on needle (stock) and the mix should be 1/2 out to 2 turns out then do a plug chop. Adjust for plug chop results. Super good idea to do a leak down. If you are jetted this way and stil have a bog check crabs and post back if you didn't get it fixed I have a HJR dune port 4 mill. I hope your needle is the stock one not the dyno jet long needle. You can try to choke the bike to see if your 1/2 throttle bog goes away. Quote Link to comment Share on other sites More sharing options...
Jraz Posted July 2, 2012 Author Report Share Posted July 2, 2012 Have other problems. Bought this Ada head and am having problems getting it sealed. O rings all good but Still has leak. Coolant getting in cyl and mix getting in head. It is getting hot very fast also. Out of curiosity I measured the outlet on carbs and measures 28mm. Mikuni. Not sure if they were ported or just round 28's. Bought this as a project but did run before the 4mill. Has 35 pilots, needle is quite long and pointy. Quote Link to comment Share on other sites More sharing options...
vulvafan537240 Posted July 2, 2012 Report Share Posted July 2, 2012 (edited) Have other problems. Bought this Ada head and am having problems getting it sealed. O rings all good but Still has leak. Coolant getting in cyl and mix getting in head. It is getting hot very fast also. Out of curiosity I measured the outlet on carbs and measures 28mm. Mikuni. Not sure if they were ported or just round 28's. Bought this as a project but did run before the 4mill. Has 35 pilots, needle is quite long and pointy. dont run it anymore while its leaking! itll smoke your top end quick. do you have ada domes or domes from another aftermarket head. i believe only ada domes work with their heads. 35 pilots are waaaay too big. 27.5s are what youll need. id say start at about 320 on the main and work your way down. fix that air leak first though. do a leakdown test. Edited July 2, 2012 by volfan537240 Quote Link to comment Share on other sites More sharing options...
vulvafan537240 Posted July 2, 2012 Report Share Posted July 2, 2012 forgot to ask if youre running a airbox or dual pod filters. if youre running an airbox, id agree to go with 25's. Quote Link to comment Share on other sites More sharing options...
Jraz Posted July 2, 2012 Author Report Share Posted July 2, 2012 forgot to ask if youre running a airbox or dual pod filters. if youre running an airbox, id agree to go with 25's. Running air box. Pretty sure it was 35. Crazy I thought. Have to get a magnifying glass. How do I figure out if the carbs are 26, or been opened to 28. That and wtf is with this head? Just purchased it. Ada domes 21cc. The o rings are in place but it's def leaking. Quote Link to comment Share on other sites More sharing options...
Jraz Posted July 3, 2012 Author Report Share Posted July 3, 2012 Carb outlet measures 28mm. How do I find out if the have been modified or are round 28's. Stumped!! Quote Link to comment Share on other sites More sharing options...
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