76arctic cat

I have a 76 arctic cat cheetah 5000 was backfiring out the intake i bumped the timing and know it backfiring out exhaust was wondering if anyone could give some advise. Thanks

RJ Gleason

Compression is?

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Old Cat Rider
'93 Wildcat 700EFI
w/ Comet 108 Pro-4 clutch & 01 ZR skid

'90 Wildcat Project in progress.

Vintage (sorta)
1980 Indy Trail 440 (for sale)
1980 AC Pantera (donor engine to the 90 wildcat)


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kccats

Have you been adjusting the timeing or had the flywheel off before this started happening?

76arctic cat

Compression is bout 95 and the person that had it before me had the flywheel off to change stator.

smokingcrater

No idea what compression should be on that, but that sounds low... Compression that low automatically means its going to be a pain to get started, fuel is harder to ignite without the compression behind it.

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1) 2000 Arctic cat ZR 700, which now thinks it is a 2001 ZR 600 EFI APV w/136" ripsaw. (for sale!)
2) 1995 Yamaha VMAX 600, which now thinks it is a Polaris! (Polaris x10 suspension, Polaris P85 clutch) (for sale!)
3) 2004 Yamaha Warrior
4) 2006 Yamaha Nytro

RJ Gleason

Compression should be 120 or better, under 100 means that if you get it started, it will run very poorly.

__________________
Old Cat Rider
'93 Wildcat 700EFI
w/ Comet 108 Pro-4 clutch & 01 ZR skid

'90 Wildcat Project in progress.

Vintage (sorta)
1980 Indy Trail 440 (for sale)
1980 AC Pantera (donor engine to the 90 wildcat)


http://www.dcdrifters.net/


Senior Warden; F&AM Dryden Lodge# 472
http://www.masonicdryden472.org/

Rules of this forum are strictly enforced!

76arctic cat

Ill look into the compression issue but what bout timing and backfiring issue.

kccats

Did you test with throtle wide open? If so then the compression IS your problem!

smokingcrater

fix one issue at a time, and often the other issues go away! The timing is going to have to be reset, no question there. The backfiring could be from the timing, but it could also be from the compression. (low enough compression the fuel charge doesn't always ignite in the cylinder, sometimes it will misfire and send raw fuel out the exhaust, where it will ignite.)

__________________
1) 2000 Arctic cat ZR 700, which now thinks it is a 2001 ZR 600 EFI APV w/136" ripsaw. (for sale!)
2) 1995 Yamaha VMAX 600, which now thinks it is a Polaris! (Polaris x10 suspension, Polaris P85 clutch) (for sale!)
3) 2004 Yamaha Warrior
4) 2006 Yamaha Nytro

76arctic cat

I didn test compression with wot

kccats

Either get a second tester to confirm, or pull it down!