Bobbert
Serious Thumper
Offline
CHOP IT
Posts: 836
Los Angeles, CA
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I dont know why the bike is having trouble at the top end, but it's pretty obvious why you're getting backfiring:
your carb is running lean at idle
the Savage carb has at least three ranges: idle to 1/4 throttle, 1/4 to 3/4 throttle, and 3/4 to wide open. The spacer affects 1/4 to 3/4. You've richened the mixture in this range, but when you let off the throttle, it drops back down to the idle range, and because you're lean here, it backfires. To fix this backfiring, you need to richen the idle mixture. The carb has a screw that regulates the amount of gas that is added to the mix in that idle to 1/4 range. If yours hasn't ever been tinkered with, you'll have a brass plug over this screw that you'll need to pull out before you can mess with it. The screw will be on the right side of the carb and if you have the plug on, it will probably have white paint on it. If you're lucky, it's already gone. Otherwise you'll have to pull it out, but I'm not the guy who can tell you how thats done.
Once you get that plug out or if it's already gone, follow Lancer's carb tuning guide with this screw and you'll get rid of that backfiring real quick.
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