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LX255 crank with no start.


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#1 KenM OFFLINE  

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Posted March 09, 2015 - 07:22 PM

Got an lx255 crank no start. Has spark and getting fuel to carburetor. Pulled flywheel off and checked key. It is still in place. Replaced bad ignition module (coil). Engine has compression. Pulled valve cover to inspect valve springs. The valve springs move as they should. Or at least appears to. It will backfire every now and then. Following video shows cranking with backfire. You can tell when it backfires as I get the living hell scared out of me and shake phone. Backfires get me every time.

http://vid859.photob...32132085526.mp4

Any clues on what could be wrong?

Edited by KenM, March 09, 2015 - 07:23 PM.

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#2 Auburn David OFFLINE  

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Posted March 09, 2015 - 08:05 PM

Checked compression?



#3 Auburn David OFFLINE  

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Posted March 09, 2015 - 08:06 PM

Doesn't sound like it has much..



#4 Auburn David OFFLINE  

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Posted March 09, 2015 - 08:11 PM

As unorthodox as is sounds put a little 80 wt gear oil in the spark plug hole..if it tries to crank then its rings(stuck or worn)other wise it is valves not seating or a cam/timing issue...well this how I do it anyway..



#5 KenM OFFLINE  

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Posted March 09, 2015 - 08:18 PM

Not sure about how much compression it has.  Just know that it has some compression.  I don't have a compression gauge yet.  Yet I say.  That may be on the list tomorrow.

 

I'm considering pulling the engine out and pulling pan off to check timing marks and cam gear since I cannot check compression yet.  Needs the oil changed anyway.  Oil does not smell like gas.  So gas is not getting by rings or valves.



#6 Auburn David OFFLINE  

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Posted March 09, 2015 - 08:34 PM

I would check the valves first..but the 80wt test works every time..



#7 KenM OFFLINE  

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Posted March 09, 2015 - 11:21 PM

Took the engine out and took oil pan off.  And here is what I found.....

 

http://vid859.photob...309_2223031.mp4

 

So what do you think?

 

P.S.  Don't make fun of my ratchet.  That stupid pin won't stay in.


Edited by KenM, March 09, 2015 - 11:22 PM.

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#8 Trav1s ONLINE  

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Posted March 10, 2015 - 09:20 AM

I would say there is NO compression either.  Unfortunately I am not familiar with the small OHV engines.  I think I would pull off the valve cover or top end of the engine and see if the valves are stuck.  


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#9 KenM OFFLINE  

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Posted March 10, 2015 - 09:56 AM

I pulled valve cover off already. All things seem to be moving properly. Possibly valves not seating properly causing lack of compression. It does have some though. With spark plug out it will force air out hole. Think I will pull head off and check valve seating surface. Possible carbon build up or something. Who knows. But gonna have to wait for a while. Out of town for a bit.
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#10 Trav1s ONLINE  

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Posted March 10, 2015 - 10:15 AM

I was thinking about carbon build-up too.


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#11 KenM OFFLINE  

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Posted March 13, 2015 - 10:39 AM

Found it. Carbon build up behind a valve is not the cause nor was it a case of valve not seating properly.

uploadfromtaptalk1426261045948.jpg

Exhaust valve seat came loose.
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#12 Trav1s ONLINE  

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Posted March 13, 2015 - 11:04 AM

Are you going to try to reseat it and run the machine?  Did that with a 4HP Briggs and it works great.  



#13 KenM OFFLINE  

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Posted March 13, 2015 - 11:07 AM

Gonna try to. If I can save $267.77, I'm gonna try that first.
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#14 KennyP ONLINE  

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Posted March 13, 2015 - 01:14 PM

Good luck!


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#15 KenM OFFLINE  

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Posted March 13, 2015 - 01:15 PM

Thanks. I got it back in place. Just gotta head to town and get new head gasket.




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