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Discussion Starter #1
<cross posted>
01 660.
I'll get right to it, bought a 01 660 for I hope the right price. Bought as no start. Wants to crank, it labors / cranks slow and backfires. New battery and cable repaired (third one with bad positive cable). Fluids ok and 12 volt power seems ok. After reading a million posts here and elsewere I am leaning towards decompression problem? Before I start tearing things apart I wanted some input from people that have experienced this problem.
I am an auto guy, ASE master and all that. Not afraid of repairing, just want direction. Thanks!
Update: flat tow around block, no fire. Can crank with just starter, but if I open throttle starter struggles/stops. 2+2 when cranking no help. has spark. Prior owner replaced carb, kinda sketchy job. Sounds like strong compression, my gauge is at work. Intermittent backfire on start attempt. Repair history on this quad unknown.
HELP
 

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Master of the Electron
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Try starting with fuel petcock off using starting fluid - successful at least trying to run? Carb issues! I suspect you are extremely rich.

It could be a decomp issue - but pull starting would get around that... yet it didn't.
 

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Discussion Starter #4
I am going to check valve clearance today, if good then tearing it down to check decompression pin and system.
 

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Master of the Electron
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Run a compression test... if it's much over 100psi the decomp is not working properly.
 

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Discussion Starter #6
Its gotta be the decompression. Adjusted valves, fresh battery, way too much draw when trying to crank. I rebuild Volvo motors all day long so this should not be too much of an issue. Just wish I had a manual...........
 

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Discussion Starter #7
Better yet, if your off 3 teeth on the timing chain....... Love buying these things from idiots. Should be burning gas this afternoon.
 

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Discussion Starter #9
Thanks Maniac!
I set the timing chain to where I believe it is right, now it cranks normal but no fire. Gonna read through the manual, bring home a real spark tester and compression gauge and diag it tonight.
 

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Discussion Starter #10
Ugg, what a mess. Prior owner tried to put piston in, now I have head off fixing things. There was no decomp spring or pin in cam.leakdown is excessive on piston with ATF poured in jug, so he prob screwed the rings also. Minor damage to cam journals on head from trying to start with oil starvation due to missing pin. Waiting on parts again. At least the bike runs
 

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Master of the Electron
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Aaaarrrgh... I love having to fix other people's failures. Good luck.
 

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Master of the Electron
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Good luck - let us know how it comes out.
 
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