Suzuki Discussions about Suzuki ATVs.

Lt80 Hard To Start

Old Mar 19, 2018 | 09:04 AM
  #11  
DirtDevil101's Avatar
Pro Rider
Joined: Oct 2015
Posts: 1,107
Likes: 1
Default

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?
 
Reply
Old Mar 19, 2018 | 09:17 AM
  #12  
jashworth's Avatar
Thread Starter
|
Weekend Warrior
Joined: Mar 2018
Posts: 19
Likes: 0
Default

Originally Posted by DirtDevil101
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?
I’ve 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 I’m pretty sure the plug was wet.
 
Reply
Old Mar 19, 2018 | 09:36 AM
  #13  
LT80's Avatar
Extreme Pro Rider
LT80 Expert
20 Year Member
Liked
Joined: Mar 2001
Posts: 8,340
Likes: 33
Default

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.
 
Reply
Old Mar 19, 2018 | 05:56 PM
  #14  
thanasi's Avatar
Weekend Warrior
Joined: Feb 2013
Posts: 17
Likes: 1
Default

ck the vacuum line at the fuel ****/fuel pump make sure no fuel is present on the vacuum side hose to the intake
 
Reply
Old Mar 19, 2018 | 07:11 PM
  #15  
jashworth's Avatar
Thread Starter
|
Weekend Warrior
Joined: Mar 2018
Posts: 19
Likes: 0
Default

Originally Posted by LT80
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 didn’t 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.

 
Reply
Old Mar 19, 2018 | 09:18 PM
  #16  
LT80's Avatar
Extreme Pro Rider
LT80 Expert
20 Year Member
Liked
Joined: Mar 2001
Posts: 8,340
Likes: 33
Default

The heads can look like that.
 
Reply
Old Mar 20, 2018 | 08:47 AM
  #17  
jashworth's Avatar
Thread Starter
|
Weekend Warrior
Joined: Mar 2018
Posts: 19
Likes: 0
Default

Originally Posted by LT80
The heads can look like that.
So you think the head is fine?

I’m going to get another gasket set and put the top end back on.

Whats the best way to drain the crank case?
 
Reply
Old Mar 20, 2018 | 09:07 AM
  #18  
LT80's Avatar
Extreme Pro Rider
LT80 Expert
20 Year Member
Liked
Joined: Mar 2001
Posts: 8,340
Likes: 33
Default

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.
 
Reply
Old Mar 20, 2018 | 12:19 PM
  #19  
jashworth's Avatar
Thread Starter
|
Weekend Warrior
Joined: Mar 2018
Posts: 19
Likes: 0
Default

Originally Posted by LT80
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 I’ll try that. I’m hoping it was just a low compression problem. If the top end is properally installed, what else could cause low compression?
 
Reply
Old Mar 20, 2018 | 02:41 PM
  #20  
DirtDevil101's Avatar
Pro Rider
Joined: Oct 2015
Posts: 1,107
Likes: 1
Default

Bad/worn rings, hole in piston, scored cylinder wall, blown head gasket, warped head, wrong sized piston...I'm sure I missed a couple...
 
Reply

Thread Tools
Search this Thread

All times are GMT -5. The time now is 10:54 AM.