2000 polaris xplorer 250 carburator
#12
You've just answered your own question! 110 compression is too low! Probably why it was back firing to begin with! They will backfire and spit gas out of the back of the carb when the piston is worn out! Or crank seals may be leaking also causing the compression to be low OR could be a combination of both piston wear and seals! Time either for a new top end or a rebuild if the rod has any up and down play at the crankshaft. OPT
#15
110 pounds compression is the problem! Whether from piston/ring wear Or leaking crank seals! The stator sends the "signal" to the cdi module which sends the spark to the coil. The "timing" is electronically controlled by the cdi. OPT
#17
You can check the throttle,make sure that you have ONLY 1/8" slack at the thumb lever adjust cable if needed. Also hold the throttle WIDE OPEN when trying to crank,could be the engine is flooded,also you can try spraying a dab of starting fluid or contact cleaner and see if it starts,but the 110 compression reading is still not good! OPT
#19
What I've said before,low compression! They can start up and run ,but also when they get warm and cylinder expands and rings don't seat well against cylinder walls,they loose even more compression, won't idle and some just die. Then a lot are hard to restart until the engine cools down. OPT
#20
I called polaris they said 110-112 when pull starting, motor barely turning over isn't good but not necessarily bad. They said we needed to bring it in if we couldnt get a good check on it but Once we got it running today compression is at 115
Exhaust back on tomorrow after its cleaned and will try again.
Exhaust back on tomorrow after its cleaned and will try again.
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