When you throttle down at times the bike backfires
Backfire when throttle down can be;
1. dirty carbs that are running lean and need cleaning. Also the rubber grommets that hold the carbs can be leaking at the backside or even dry rotted.
2. no air filter
3. broken or open vacuum lines
4. an aftermarket exhaust that needs rejetting or an open exhaust system
SOURCE: bike backfire
Yes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...
SOURCE: 2006 honda shadow sabre backfires
valves need to be adjusted every 6000 miles your way past due also your carbs need to be in sync together a shop has to do this work
SOURCE: ktm 250 sxf 2008 backfires
go on google check the air mixture and altar the air screw on the carb to wot u find on the net easy job thers only 2 screws on the carb
SOURCE: Bike backfires and I can't get a smooth ride
I would say it is a faulty engine temp or Air temp sensor,
SOURCE: Backfire when I get off the throttle and down shifting
no your totally wrong the backfire is bcause if u juice the throttle there is excess fule in the cylinders witch give it no where to go so it ignights and creates a backfire witch is not necessarly bad.
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