John Deere LA115 runs at very low rpm... Help! - Lawn Mower Forums : Lawnmower Reviews, Repair, Pricing and Discussion Forum
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post #1 of 8 (permalink) Old 09-19-2019, 03:17 PM Thread Starter
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John Deere LA115 runs at very low rpm... Help!

I have a 2009 with 91 hrs on it John deer that randomly stopped working 10 minutes into the cut. I couldn't start it again. I cleaned the carb completely, replaced the goofy gasket (everything was lined up correctly when I put it back together), checked the plug bushed it clean (new last year). It started hard, and sounded very slow. Not the screaming monster it usually is. I replaced the fuel pump and inline filter. Still nothing better. The compression checks out good at 120, plug gap is .030. fuel is getting into the system, but still no power!

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post #2 of 8 (permalink) Old 09-19-2019, 03:43 PM
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Did you check your valve clearance? These motors tend to eat cams and this causes a variety of problems.

When you say it started hard, did it crank slowly, or did it just take a while to catch?

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post #3 of 8 (permalink) Old 09-19-2019, 09:11 PM
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Plugged gas cap vent?
Dirty air filter?
Choke plate closed?


Is this a single or twin cylinder?
If a twin, one cylinder not firing?

Experience is something you don't get until just after you need it.
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post #4 of 8 (permalink) Old 09-22-2019, 02:40 PM Thread Starter
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The compression is at 120, so wouldn't that mean the valve clearance is good?

Air filter is clear I'll check the gas cap...
post #5 of 8 (permalink) Old 09-22-2019, 02:41 PM Thread Starter
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Quote:
Originally Posted by Grunt View Post
Plugged gas cap vent?
Dirty air filter?
Choke plate closed?


Is this a single or twin cylinder?
If a twin, one cylinder not firing?
Single cylinder
post #6 of 8 (permalink) Old 09-22-2019, 02:42 PM Thread Starter
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Quote:
Originally Posted by motorhead12 View Post
Did you check your valve clearance? These motors tend to eat cams and this causes a variety of problems.

When you say it started hard, did it crank slowly, or did it just take a while to catch?
It cranked slowly, but tended to catch quickly once it started to spin.
post #7 of 8 (permalink) Old 09-23-2019, 05:17 PM
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If the compression release is broken, it might cranks slow. You should probably still check the valve clearance.

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post #8 of 8 (permalink) Old 09-26-2019, 07:08 AM
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Like Grunt mentioned, check that the choke is functioning and not stuck shut (easiest cheapest check). Being Briggs OHV it more than likely valve train related (regardless of hours). It's very easy to check the valve operation by pulling the valve cover. Typical issues with them is a hot engine (nest or grass clippings under cowling) causing the valve guide to walk out, shortens travel of the rocker, valve can't open far enough, pushrod bends, loss of power. Compression will show because valves are still shutting. Since you did mess with the carb, check your oil level to make sure it's not high (fuel contaminated) which will also cause a loss of power.
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