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Lt80 Hard To Start

  #21  
Old 04-07-2018, 01:56 PM
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Originally Posted by DirtDevil101 View Post
Bad/worn rings, hole in piston, scored cylinder wall, blown head gasket, warped head, wrong sized piston...I'm sure I missed a couple...
so my compression was 50 psi after the new top end was installed. I removed the top end again and put back together and still got 50 psi. I removed it again and put another new kit on it and still got 50 psi. The only thing I can think of is that my head is damaged. It has a few cracks as you can see in the above picture but I canít tell if itís warped.
 
  #22  
Old 04-07-2018, 01:58 PM
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Originally Posted by LT80 View Post
Head is fine imo.
If the base gasket isn't tore, you can re-use both gaskets.
While apart, you could try placing a rag on top and blowing air down around the crank. Usually it's together and we take the plug out, disconnect the wire to the coil, use rag, and spin motor till most is gone. Then apply full throttle till is starts and cleans out.
so my compression was 50 psi after the new top end was installed. I removed the top end again and put it back together and still got 50 psi. I removed it again and put another new kit on it and still got 50 psi. The only thing I can think of is that my head is damaged. It has a few cracks as you can see in the above picture but I canít tell if itís warped
 
  #23  
Old 04-07-2018, 05:40 PM
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Did you try squirting some oil in since the new rebuild to see if the comp raised?
 
  #24  
Old 04-08-2018, 04:01 PM
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Originally Posted by LT80 View Post
Did you try squirting some oil in since the new rebuild to see if the comp raised?
I torqued the nuts down to about 115 inch pounds, squirted some oil into the cylinder and got 105psi. Still wouldnít crank.
 
  #25  
Old 04-08-2018, 10:56 PM
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Won't start.. wet plug after trying (gas not oil)? If not put 2 fingers in front of carb to hand choke it. If wet, maybe flooded. Apply full throttle till it starts and cleans out.
 
  #26  
Old 04-09-2018, 03:45 PM
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Originally Posted by LT80 View Post
Won't start.. wet plug after trying (gas not oil)? If not put 2 fingers in front of carb to hand choke it. If wet, maybe flooded. Apply full throttle till it starts and cleans out.
Okay so now when I try to start it, it will turn over for a few seconds and then it will stop turning over and the starter relay will start clicking. I hit the reset button on the back of the quad which will click and then I can turn it over for a few seconds and then the same thing will happen. Does this mean my relay is bad?
 
  #27  
Old 04-10-2018, 11:08 AM
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Sounds like it...


BTW, 105 PSI on a fresh top-end is not right...should be 120+...my LT80 rebuilds have all been 130+...
 
  #28  
Old 04-10-2018, 12:26 PM
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Originally Posted by DirtDevil101 View Post
Sounds like it...


BTW, 105 PSI on a fresh top-end is not right...should be 120+...my LT80 rebuilds have all been 130+...
Would psi increase once it runs and the rings seat all the way?
 
  #29  
Old 04-10-2018, 02:44 PM
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I don't think so...but Jack is the Pro so I'll defer to him...
 
  #30  
Old 04-10-2018, 03:05 PM
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I think rings seat..depending. If you run synthetic (and everyone should) they take forever to seat if they do. It's advised to run a petroleum based oil to seat the rings. Then go to synthetic.
I run synthetic. Period.
With all that said, 105 is certainly enough to for it to start.
 

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