anhedonian Posted April 13, 2010 Hey, Anyone got a mikuni pumper working on a 430? I can't seem to get it right with the jets I've got.. It's running a JE 430 piston at 10.5:1 comp, stock exhaust with no baffle, hiflo air filter with the snorkel uncorked. Not that it makes a difference but there's a s1 hotcam in there too. The carb's set up now as I got it from the shop (will have to check tomorrow to tell what jets they are), tuned for stock combustion at 0-1000ft. Ran perfect as a 400, plug's black as sin as a 430! W. 2001 XR400 Share this post Link to post Share on other sites
Trailryder42 Posted April 13, 2010 I'd say definitely find out what jetting is in it. I'd start with a 130 main and 15 pilot for your setup. The fuel screw will need retuning for the 430. The vacuum signal to the carb jetting and air jet will be a little different from the stock bore. Share this post Link to post Share on other sites
