Guest Kelsey Mitchell Posted January 14, 2004 Share Posted January 14, 2004 Hey there, I have problem with my triple mukini surging between 4250 and 5500. I dont have a clue on what this is but if you put it on a dyno, it would look like the teeth on a saw blade! THis is starting to get on my nerves and all help would be great! Cheers in advance! Quote Link to comment Share on other sites More sharing options...
JMortensen Posted January 15, 2004 Share Posted January 15, 2004 You should be on the main air and fuel jets at those rpms. Seems kinda weird that you would have a hesitation over such a narrow rpm range if it were a jetting problem. Makes me think it might be ignition related. Does it do this regardless of whether you floor it to get to those rpms or whether you gradually get there at say a steady 3/4 throttle? That would eliminate the accelerator pumps completely, but I think they're pretty much done at that rpm anyway... Are these new carbs for you? Do you have all the same jets in every jet block? That would be a pretty bad mistake, but it's worth checking if these are new-to-you carbs. What kind of ignition are you running, and when was the last time you did a tune up with plugs/cap/rotor/wires? Jon Quote Link to comment Share on other sites More sharing options...
Tony D Posted January 16, 2004 Share Posted January 16, 2004 make sure your jetblocks have not vibrated loose. Mine used to do funky surging and I found several have vibrated loose. Finding a screwdriver to fit the jets correctly so it doesn't cam-out of the groove is difficult, but worth it. I ended up with a 1/4" drive flat blade that was hollow ground that fit well, and the small ratchet lets me torque it so it won't come loose again. I agree, you should be on mains and surging usually indicates a lean mixture. Are you sure you are not having a spark issue (ground problem)? I've seen that, too! Good Luck. Quote Link to comment Share on other sites More sharing options...
JMortensen Posted January 16, 2004 Share Posted January 16, 2004 Tony's got a good point. I've seen the jet blocks come loose on other people's Mikunis. Never happened to me because the guy who taught me always told me to put them in tight. Still think it wouldn't cause that type of problem over such a narrow rpm band, but definitely a common Mikuni issue. Jon Quote Link to comment Share on other sites More sharing options...
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