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Lots of backfiring on start up and idle after rebuild?

W
Apr 20, 2016
14
0
1
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Breckenridge, CO
Hey guys,
Let me start with my sled and some info.
2013 Polaris RMK Pro 800
Just did a top end rebuild with:
Wiseco Pistons, rings, pins, and bearings
"Durability" spacer
V-Force3 reeds
all new gaskets
new plugs
new ignition wires and boots
tps adjustment

And i have A LOT of backfiring on startup and while idling. I had to adjust the throttle to keep the idle up because it has a very low idle. I originally thought it was flooded because i actually had this issue before so i took the cylinders off again to check ring gap again, all good, and saw a lot of fuel and oil in the y-pipe.

Does anyone have a clue whats going on?! I feel that I've tried everything
 
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