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Old 07-18-2013, 08:48 AM
trophyman trophyman is offline
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Scratching My Head over this one!

OK, my 99 Lazer 60 CH25S commercial 60 was running great till this w/e. It runs, and mow's fine till all at once it shuts down like somebody turned the key off. Went through the fuel system, new fuel filter, switched tanks, even replaced the pump NO JOY.

So--here is what I've done to try and narrowed it down. I can run it all day long IF I don't turn the mower deck on and run it at FULL SPEED. If I open throttle to about 3/4 speed, it runs and cuts fine. If I push the throttle all the way open, while the mower deck is on, MOWING OR SITTING STILL, it will die after about a minuet or so. It's like somebody turned the key off. If I catch it, and shut the mower deck down, it will pick up like the key was turned off and back on.

So--safety switch?? Is there an over speed sensor someplace?? Any, and all, suggestions/thoughts are appreciated.
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Old 07-18-2013, 10:00 AM
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Valk Valk is offline
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Shot in the dark: fuel pump not meeting needs of full throttle?
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Old 07-18-2013, 10:10 AM
herler herler is offline
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Sure, I'll take a guess...

I am curious if you have checked the oil level lately, if the engine has low oil shut down it could make it act that way, on full throttle more oil gets shot around and there's less in the sump that could cause an intermittent failure such as which you describe, assuming the oil level is right there, either way I'd check the oil to eliminate this possibility.
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Old 07-18-2013, 10:11 AM
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piston slapper piston slapper is offline
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Unplug and check the connectors in the engine harness...also check for melted fuse holders..
If they check good..disconnect the white wire in the engine harness...this bypasses the safeties...try it again..
Im guessing you have a smart spark ignition system...it is grounded to the intake bolt...if it gets loose it will cause the problem you have..
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Old 07-18-2013, 10:14 AM
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piston slapper piston slapper is offline
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Quote:
Originally Posted by herler View Post
Sure, I'll take a guess...

I am curious if the engine has low oil shut down, and if you have checked the oil level lately.
There are no low oil shutdowns on lawnmowers...only horns..beepers..and lights..
Nothing that will stop or prevent it from starting...
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Old 07-18-2013, 12:20 PM
trophyman trophyman is offline
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Quote:
Originally Posted by Valk View Post
Shot in the dark: fuel pump not meeting needs of full throttle?
Yea, I thought bout that. Thats why I replaced the pump first off. No joy.
Quote:
Originally Posted by herler
I am curious if you have checked the oil level lately
Yep, thought that also. Oil is good, but thanks for both suggestions.

Quote:
Originally Posted by PISTON SLAPPER
Unplug and check the connectors in the engine harness.
I'm off to the shop to check your suggestions. Thanks so much for the trouble shooting sequence.
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Old 07-18-2013, 01:14 PM
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Molly's Dad 138 Molly's Dad 138 is offline
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Very curious to hear your solution. I bought the same model used from a guy near me on the Eastern Shore on Monday of this week. Ran great until last night when it started doing the exact same thing.
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Old 07-18-2013, 03:11 PM
wahlturfcare wahlturfcare is offline
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have you had the carb apart and checked the slow jet o rings? I have had a kohler 25 command do that before. you also might check the diaphram pump on the carb too as they also go bad over time.
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