900 cat ignition issues

justincredible5 · Mar 8, 2009

hey i have a 2003 900 mountain cat i was racing my brother across a lake and i blew a belt pretty hard put a hole in the belly pan bent the clutch cover so i put a new one on and the sled runs like crap it backfires and doesent have any power, i pulled the head off and the pistons look good so i was thinkin maybe i cracked my timing key, could someone please shed some light on this please!

spring snow hero · Mar 8, 2009

you need to stop riding it NOW, check your crank phase......it sounds like you twisted it.

Rixster · Mar 8, 2009

Yeah, what he said. Your crank is toast!

76FOMOCO · Mar 8, 2009

Rixster said:
Yeah, what he said. Your crank is toast!

X3^

justincredible5 · Mar 9, 2009

ok it hasnt been ridden how do i go about checkin the crank? is this a complete motor dissasembly adventure>?

diggerdown · Mar 9, 2009

First take the clutch off and set a dial inicator up at the pto end of the shaft to check runnout. .002 is pretty normal by the time you get past .005 you know you have a problem. Thats is quick and simple. Next set the dial indicator up at the spark plug hole, find top dead center on each piston and check that against the timing mark by the stator.

m_beeson · Mar 9, 2009

diggerdown said:
First take the clutch off and set a dial inicator up at the pto end of the shaft to check runnout. .002 is pretty normal by the time you get past .005 you know you have a problem. Thats is quick and simple. Next set the dial indicator up at the spark plug hole, find top dead center on each piston and check that against the timing mark by the stator.

X2

Just be sure to mount your dial indicator to the motor, and not any place else. It will give you a false reading.

justincredible5 · Mar 9, 2009

well thanks for the insight guys... not the answer i was hoping to hear lol, but thats what toys are all about. anyone gotta crank sittin on the shelf there not using

76FOMOCO · Mar 9, 2009

if its out of phase you can take it to a good crank guy and they can put it back in phase. this will be a full rebuild though and might just be worth the price to have it welded.

justincredible5 · Mar 9, 2009

so im guessin this is at least another thousand dallar bill under the hood?

76FOMOCO · Mar 9, 2009

if you do all the labor yourself and have a crank shop do the crank work you will be about 250. if you get a cat manufactured crank your looking about 700 out the door. i would put front and rear seals in if you have it to this point and a new base gasket for the jugs other than that you should be good.

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900 cat ignition issues

justincredible5

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spring snow hero

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