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#1 dennis55 OFFLINE  

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Posted July 07, 2012 - 06:15 PM

hello, i have a craftsman mower with a 17 hp kohler moter ohv and hydraulic lifters..now for a while the moter was spitting gas out of the muffler, so i bought a new carb put it on and its backfireing. i thought the coil wasnt giving enough spark so i replaced it and it still does the same.is it possible that something internal is broke causing it not to start.. thanks for any help

#2 olcowhand OFFLINE  

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Posted July 07, 2012 - 06:21 PM

Could be a bent push rod, gas fouled spark plug, or a sheared flywheel key to name a few.

#3 KennyP OFFLINE  

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Posted July 07, 2012 - 06:30 PM

When you say backfiring, is that out the exhaust or intake? Could need the valves adjusted, or what Daniel said!

#4 Ryan313 OFFLINE  

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Posted July 07, 2012 - 08:17 PM

:welcometogttalk: Sorry, but I can't help much here. I just wanted to welcome you! We are a good friendly group here. Although, it seems like Daniel and Kenny both forgot their manners! :poke:
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#5 olcowhand OFFLINE  

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Posted July 07, 2012 - 08:19 PM

:welcometogttalk: We are a good friendly group here. Although, it seems like Daniel and Kenny both forgot their manners! :poke:



I stand reprimanded! Welcome Dennis!!!!!!!

#6 dennis55 OFFLINE  

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Posted July 07, 2012 - 08:38 PM

when i crank it after 10 secs or so it back fires or pops back out of the carb air filter, wont start. im think maybe a cracked head gasket? (if im lucky. i changed the plug,im getting a spark/fuel.im thinking maybe the float on the new carbs stuck?

#7 olcowhand OFFLINE  

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Posted July 07, 2012 - 08:41 PM

A stuck float or flooding for whatever reason could cause it. Sticky valve could too.

#8 dennis55 OFFLINE  

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Posted July 07, 2012 - 08:45 PM

after i put the new carb on it stopped throwing gas out of the carb when i started it for the first time(each time i used it) after the new carb didnt work i thought maybe the coil but after putting a new one on and no change im stummped.what internal parts would cause this

#9 KennyP OFFLINE  

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Posted July 07, 2012 - 08:47 PM

Welcome to the forum, Dennis!
Thanks, Ryan! I was busy reading and didn't look at post count!

#10 HDWildBill OFFLINE  

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Posted July 07, 2012 - 09:37 PM

Welcome to the Forum Dennis.

When troubleshooting go to the easiest thing first. Replace the spark plug. Not to long ago I was over at my buddy's house and he had just done a service on a Craftsmen and during that service he put a new spark plug in. When he fired it up it started doing the same thing. I would guess you may have had a sticking float on the old carb and now the plug is fouled.

#11 HowardsMF155 OFFLINE  

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Posted July 07, 2012 - 09:58 PM

I have heard somewhere that an incorrectly timed spark will cause a Kohler to wheeze and spit back gas. I'd suggest doing a basic tune-up, new plug, new gas filter, check valve clearance, check points for wear and re-gap or replace, maybe replace the condensor. Tell us what happens next. Also, if the engine was down for a several weeks while you were waiting for the new carb, try draining the tank and putting in fresh gas. Ethanol gas can go bad quickly.

#12 Texas Deere and Horse OFFLINE  

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Posted July 07, 2012 - 11:17 PM

Welcome to GTtalk ,glad you joined us here.

I would check the Flywheel key and make sure it's not been sheared.

#13 dstaggs OFFLINE  

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Posted July 08, 2012 - 12:09 AM

Welcome Wter in the Gas or Flywheel Key would be the first place I would check.

#14 JDBrian OFFLINE  

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Posted July 08, 2012 - 05:45 AM

I'd check the ignition system as well. If you have points they can suddenly stop producing a good enough spark to start the engine.

#15 dennis55 OFFLINE  

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Posted July 08, 2012 - 06:29 AM

could a broken flywheel key throw off the timimg and be causing this?




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