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  #21  
Old 09-13-2012, 12:58 PM
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cubs-n-bxrs cubs-n-bxrs is offline
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It does not to me sound fuel related to me whatsoever. If it is the restored tractor in your avatar I would be looking at ground issues. I would make sure where all ground wires are attached it is clean and unpainted surfaces. A loose motor will also give you grounding issues. BTDT Somehow you need to check the hot side of the coil when this problem is happening to see if the 12v is dropping out momentarily.
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  #22  
Old 09-13-2012, 02:54 PM
Fred's 123 Fred's 123 is offline
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Quote:
Originally Posted by Dave R View Post
Run it in the dark and watch for either a spark jump to ground, or a loose ground. It sounds like the ignition is grounding out when you hit a bump.
If you do go driving it around at full throttle and full speed on rough and bumpy terrain in the dark... please have someone take video of the incident for the rest of us to enjoy.
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  #23  
Old 09-13-2012, 03:01 PM
teejk teejk is offline
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get your kicks from America's Funniest Home Videos...(just kidding). But the fact that it doesn't happen at less than full throttle and he has been over the entire electrical system tells me it's fuel. maybe time for a new carb.
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  #24  
Old 09-13-2012, 03:07 PM
ajgross ajgross is offline
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I also agree with it being electrical. There is plenty of reserve fuel in the bowl to compensate for a float bouncing.

AJ
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1979 [COLOR="Red"][/COLOR]682- Mag18, Sleeve Hitch, Spring Assist, #1 Tiller
1980 [COLOR="Red"][/COLOR]782- Mag18, Sleeve Hitch
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  #25  
Old 09-13-2012, 06:13 PM
Fred's 123 Fred's 123 is offline
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I have a push mower with a horizontal engine (I guess most are), piston pumping front-to-back. Any time I run it into an obstacle, it misses a beat, just from the inertial shock out of time with the piston travel.

My interepretation of the original post is that it misses just one or two strokes on impact with a large bump in the terrain. I suspect in this case that it is not fuel related, as there are not many fuel supply problems I can imagine that will cause an engine to miss a quick stroke or two and recover. It's more likely a mechanical problem (governer bouncing, etc.) or electrical.

Is your ignition coil oil filled or potted? Oil filled ignition coils are KNOWN to display this behavior, as the coils bounce around unconstrained inside, and often break in intermittent fashion. I have been thru that exercise twice before.
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  #26  
Old 09-13-2012, 06:52 PM
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Time to get a diesel.
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Brinly 12inch plow, 2x cultivators and x2disc Brinly Tool bar cub10:
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  #27  
Old 09-28-2012, 06:50 AM
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I'm still fighting with this problem. Yesterday I went and bought a ignition coil and condenser from NAPA. The condenser didn't seem to helpand neither did the coil. I also replaced the aftermarket in line fuel filter that I had installed along with the fuel line. I guess I am going to have to go back to checking wires. I am hoping that I come across something I have missed before. Mark
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  #28  
Old 09-28-2012, 03:23 PM
messary messary is offline
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ok, I guess I'll throw my two cents in. Have you checked the float level? My 782 would stumble and miss when going over bumps. the float level was set too high. I assume it was letting fuel slosh and acutually flooding the motor temporarily. This might explain why it only happens at lower rpm. At high rpm, the motor can burn the extra fuel. Hope it helps
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  #29  
Old 09-28-2012, 04:25 PM
ajgross ajgross is offline
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You might check the plug for the ignition switch. They are prone to corrode. I know my 582 has it's moments when it refuses to start and I have to wiggle the plug at the ignition switch to get it to work..

AJ
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1981 [COLOR="Red"][/COLOR]582- Mag18, Sleeve Hitch, Spring assist
1979 [COLOR="Red"][/COLOR]682- Mag18, Sleeve Hitch, Spring Assist, #1 Tiller
1980 [COLOR="Red"][/COLOR]782- Mag18, Sleeve Hitch
1983 [COLOR="Red"][/COLOR]982- Stock, Fully Optioned
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  #30  
Old 09-28-2012, 07:58 PM
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Sam Mac Sam Mac is offline
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Quote:
Originally Posted by donnelly.me View Post
I'm still fighting with this problem. Yesterday I went and bought a ignition coil and condenser from NAPA. The condenser didn't seem to helpand neither did the coil. I also replaced the aftermarket in line fuel filter that I had installed along with the fuel line. I guess I am going to have to go back to checking wires. I am hoping that I come across something I have missed before. Mark
Part it out and as Donovan said get a Diesel.
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