2004 XVS650 Afterfire/Backfire through carb
I'm having issues with the 2004 V-Star 650 Classic I just bought for a really good deal. 25k miles, Ran fine with no pops, backfires, hesitation or stuttering for about a week. Put away for the night after riding and went to start the next day: had crank but no spark.
Diagnosed the issue as the pickup coil as it tested way under spec via multimeter, after testing entire ignition system.
Ordered a new pickup coil/stator assembly from Electrosport (ESG652) since the pickup coil and stator are sold as one unit and claimed to be better than OEM.
Status: Put it all back together and it started right up, but the issue is that once it warms up it now
- backfires/pops at idle through the front cylinder exhaust and occasionally front cylinder carbs.
-Idle is unsteady and speeds up and slows down randomly.
-When backfire/popping occurs lights get brighter or dim.
- Carb boots slightly cracked, sprayed brake fluid on them but made no difference. All vacuum lines have checked out, exhaust checks out as well.
- has fire in both cylinders, new spark plugs are gapped to spec but look sooty and black?
My instinct is telling me it's that aftermarket stator(Electrosport ESG652) is the problem, as some threads have claimed it can sometimes be problematic and cause similar issues.
Only other ideas are timing, valves, and carburetor.
I'm out of ideas. I'm a newbie when it comes to bikes and any help would be much appreciated before I end up taking it to a shop and potentially getting screwed on repair costs. Like I said, it ran fine before the pickup coil/stator replacement.
Last edited by StarRider65096; 07-18-2019 at 07:20 PM.