Lawn tractor always backfires when I turn it off?

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Old 06-13-08, 11:24 AM
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Lawn tractor always backfires when I turn it off?

Huskee 17hp 42 inch deck, automatic hydrostatic trans. I tune up my tractor every season, yet I always end up with the same problem. When I finish cutting the lawn, and shut down the mower, I suddenly get a backfire. What is causing this?
 
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Old 06-13-08, 01:13 PM
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Hello holechaser

Get an inline fuel cut-off.That will cure the backfire problem,or simply idle the engine down for 30 sec's or so B 4 cutting it off.Ya see fuel is still being pumped into a "HOT" cylinder till it stops spinning.
 
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Old 06-13-08, 10:08 PM
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the back fire is caused by unburned fuel passing through the engine after the spark is cut off and ingniting in the exhaust. idle it down before shutting off and allow the engine temp to drop, or shut off the fuel supply when killing the engine. it will be exasperated by the governer trying to speed the engine when you kill it and opening the throttle to pass more fuel into the engine.

life begins when the kids leave home and the dog dies
 
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Old 06-14-08, 10:13 PM
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Originally Posted by holechaser View Post
Huskee 17hp 42 inch deck, automatic hydrostatic trans. I tune up my tractor every season, yet I always end up with the same problem. When I finish cutting the lawn, and shut down the mower, I suddenly get a backfire. What is causing this?


Thanks for the advice!
 
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