rstacy Posted April 5, 2012 #1 Posted April 5, 2012 I have looked and looked and I cant find this screw. I just picked up an 89 and it runs well enough but I swear that it has a lean idle. The previous owner told me that his Yamaha dealer rebuilt the carbs but I don't know what they did or didn't do. I think that they left it too lean. It requires full choke when cold and takes at least 2-3 times as long as my 86 to come off of choke. Also when pulling out from a stop, it requires more throttle and lags a small bit until it gets going. And this is after it is warmed up. Accelerating while moving is laggy for the first 15% of the throttle. I read in a thread that three turns out on the idle screw is a good place to be. Is this a good method or should I just drive the bike to PA to see Earl?
rstacy Posted April 5, 2012 Author #2 Posted April 5, 2012 PS - I just synced the carbs today. They werent too far off. I also just got a laundry list of things to check from Earl. Thanks Earl!
dingy Posted April 5, 2012 #3 Posted April 5, 2012 First picture is location of mixture screw, yours may have a brass plug over hole in center of picture. If it does you drill a small hole in brass plug & start a screw in new hole, then pull plug out with screw. 2nd picture shows idle mixture screw in lower right laying on bar. Gary
chabicheka Posted April 5, 2012 #4 Posted April 5, 2012 Can someone send me a pic of the idle mixture screw? here ya go.....glad to be of assistance.
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