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Old 11-04-2013, 06:42 PM
Fubba Fubba is offline
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Stihl Km-130 will not run

I was trimming hedges with the unit when suddenly the motor stopped running. I was able to take the motor apart later to find that one of the valves had broken. I've had this particular unit for 2 years so no warranty. I have an older KM-130 as well, so I swapped the valves out. The guides, springs, and retainers are all still in good shape. Re-lashed the valves correctly, and it still would not start.

Next I took the cam gear cover off and checked the flywheel. The flywheel key had sheared, so I put the flywheel from the older unit on the broken one. I reset the timing at TDC with the arrow of the flywheel pointing to the right coil bolt and the cam gear lobe pointed straight down. Put it all back together, and the unit still will not run. I have spark. What should I check next? Everything is moving correctly inside the engine. There is a dent in the piston from the broken valve, but it shouldn't be enough to keep it from running. Any ideas?
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Old 11-04-2013, 06:59 PM
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BigFish BigFish is offline
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Google 4 mix valve adj., and scroll down to the golftech one. It's a good pdf.
It says "pdf 4 mix troubleshooting and repair"

I tried linking to it, but no go.
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Last edited by BigFish; 11-04-2013 at 07:08 PM.
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Old 11-04-2013, 07:20 PM
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BigFish BigFish is offline
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Did you check for bent pushrod/s, check the valve seat/s, re- adjust the valves after you put the new flywhl on?
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Old 11-04-2013, 07:42 PM
Fubba Fubba is offline
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Quote:
Originally Posted by BigFish View Post
Did you check for bent pushrod/s, check the valve seat/s, re- adjust the valves after you put the new flywhl on?
Yep did all that. Seats and pushrods were fine.
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Old 11-04-2013, 07:52 PM
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BigFish BigFish is offline
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When you adj. the valves, did you make sure the piston was on TDC compression, and not TDC of "valve overlap" ?
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Old 11-04-2013, 08:45 PM
Fubba Fubba is offline
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Quote:
Originally Posted by BigFish View Post
When you adj. the valves, did you make sure the piston was on TDC compression, and not TDC of "valve overlap" ?
I'm certain I did the first time. I'm not totally sure about the second time. I'll redo it.
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Old 11-04-2013, 09:16 PM
themadcutter themadcutter is offline
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Quote:
Originally Posted by BigFish View Post
When you adj. the valves, did you make sure the piston was on TDC compression, and not TDC of "valve overlap" ?
this is important because it is actually a 4 stroke. am I correct? so after the compression stroke the next top dead center is what you call valve over lap?

is that an exhaust stroke or what?
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Old 11-04-2013, 09:18 PM
ricky86 ricky86 is online now
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Oh no..... not again.
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Old 11-04-2013, 09:22 PM
themadcutter themadcutter is offline
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when you tried to get it to start did you pre prime the cylinder with fuel any time and see if it would fire?

There is a small possibility that there is a second problem. I see why there would be no reason tho think so seeing it was running and you found an obvious problem but that does not mean a second different problem could not exist.

It also could be a cracked pan i think. I only know from looking over a bunch of old fs engines I was given for scrap that one of the ones that had a broken valve also had a cracked pan.

not sure what the connection between the two is but I'm guessing its possible.
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Old 11-04-2013, 09:23 PM
themadcutter themadcutter is offline
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Oh no..... not again.

what?
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