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Lt80 Hard To Start

  #11  
Old 03-19-2018, 10:04 AM
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Does it run on starter fluid? Most compression testers come with the right "standard" size for ATVs. Yes...you need to hold the throttle wide open when doing the test...


After you ran it and it died did you pull the plug by any chance? If yes, was it wet or dry?
 
  #12  
Old 03-19-2018, 10:17 AM
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Originally Posted by DirtDevil101 View Post
Does it run on starter fluid? Most compression testers come with the right "standard" size for ATVs. Yes...you need to hold the throttle wide open when doing the test...


After you ran it and it died did you pull the plug by any chance? If yes, was it wet or dry?
Iíve got it running 3 times so far and I believe I used starting fluid each time. One time it run for 2-3 seconds and died. The next two times I actually rode it around. And Iím pretty sure the plug was wet.
 
  #13  
Old 03-19-2018, 10:36 AM
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Petcock, no. should not cause this.
Head is a regular big spark plug. Any tester should have the correct adapter. 90 minimum for comp. Yes, hold throttle open.
 
  #14  
Old 03-19-2018, 06:56 PM
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ck the vacuum line at the fuel ****/fuel pump make sure no fuel is present on the vacuum side hose to the intake
 
  #15  
Old 03-19-2018, 08:11 PM
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Originally Posted by LT80 View Post
Petcock, no. should not cause this.
Head is a regular big spark plug. Any tester should have the correct adapter. 90 minimum for comp. Yes, hold throttle open.
So I didnít end up going to get a compression tester this evening... I decided to take off the top end to see if I could drain any fuel that may have gotten in the crank case. I noticed the head seems to be cracked. I wish I had checked my compression before I removed the top end. Before I removed it I raised the back wheels up to when I was turn it over just in case it start. When it was raised it had a hard time turning over. As soon as I let the back end down it turned over fine. I did a top end on another lt80 that didnt want to turn over after installing the top end. I removed the plug and turned it over witht the pull start and a bunch of fuel shot out and it start up once I put the plug in.

 
  #16  
Old 03-19-2018, 10:18 PM
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The heads can look like that.
 
  #17  
Old 03-20-2018, 09:47 AM
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Originally Posted by LT80 View Post
The heads can look like that.
So you think the head is fine?

Iím going to get another gasket set and put the top end back on.

Whats the best way to drain the crank case?
 
  #18  
Old 03-20-2018, 10:07 AM
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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.
 
  #19  
Old 03-20-2018, 01:19 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.
The base gasket is torn, not sure if it tore when I put it on or took it off. Okay Iíll try that. Iím hoping it was just a low compression problem. If the top end is properally installed, what else could cause low compression?
 
  #20  
Old 03-20-2018, 03:41 PM
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Bad/worn rings, hole in piston, scored cylinder wall, blown head gasket, warped head, wrong sized piston...I'm sure I missed a couple...
 

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