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Old 08-01-2009, 7:10 PM   #1
 
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lt50 compression??????

hey all, im trying to get my friends 03 lt50 running. cleaned carb to no avail. checked compression and i can only get 90 psi out of this little thing. it seems low to me but do any of you know what the compression pressure should be?
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Old 08-01-2009, 7:11 PM   #2
 
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Re: lt50 compression??????

i would think 120-130
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Old 08-01-2009, 7:17 PM   #3
 
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Re: lt50 compression??????

thats about what i was thinking. ive been trying to find a spec online with no results but im pretty sure this is too low.
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Old 08-01-2009, 7:24 PM   #4
 
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Re: lt50 compression??????

Post subject: Re: Suzuki LT 50 Help
Posted: Thu Mar 26, 2009 3:14 pm
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Posts: 49 Hopefully you have a friend that has a compression tester.
There are 2 basic types. A hand held gauge that you press into the spark plug hole and turn the motor over.
The better of the 2 is one that threads right into your spark plug hole. I got mine at sears.
Crank motor over with wide open throttle till gauge peaks.
Normal reading would be approx 120.
Under 90/100 is bad.
Then you would need to disassemble the top end and have your cylinder bored to a new piston.

There is a possibility that you have a blown head/base gasket but the fact that it's running makes me believe that they are not the problem.
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Old 08-01-2009, 7:25 PM   #5
 
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Re: lt50 compression??????

hope that helps
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Old 08-01-2009, 8:05 PM   #6
 
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Re: lt50 compression??????

yeah, i do have a compression tester. i tested and can only get 90 psi out of the cylinder. i took the top end off to inspect and found the most beautiful piston i have ever seen. the cylinder walls still look really good. i can see all of the crosshatching marks. no verticle scarring or anything. i put it back together and retested compression again. still 90psi. i dropped a little oil into the cylinder to see if it would make the compression go up but nothing changed. im probably going to replace just the rings but im still going to search for a different cause to this low compression.
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Old 08-02-2009, 2:40 AM   #7
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Re: lt50 compression??????

Originally Posted by tunil View Post
hey all, im trying to get my friends 03 lt50 running. cleaned carb to no avail. checked compression and i can only get 90 psi out of this little thing. it seems low to me but do any of you know what the compression pressure should be?
Isn't it a two stroke?
If it is, the compression is probably only about 7:1 so it should be low.
The ports are still open for a lot of the up stroke so it only starts making compression halfway up the bore.
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Old 08-02-2009, 2:52 AM   #8
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Re: lt50 compression??????

Actually, I found some specs - Suzuki's new LTA50 Quadmaster - A new standard for "50cc kid's quads". - ATV at Off-Road.com

90psi from a 50cc two-stroke I'd be pretty pleased with that myself.
If you find out the actual test spec though let us know.
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Old 08-02-2009, 10:09 AM   #9
 
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Re: lt50 compression??????

wow really, even for a 2-stroke i thought this was low. maybe not. i will keep trying different things then. thanks for your help
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Old 08-02-2009, 12:43 PM   #10
 
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Re: lt50 compression??????

well i think i just found the problem. im tired of pulling this thing so i tried some starting fluid directly into the cylinder. it almost kicked off but not quite. i noticed when it tried to start that smoke was coming out of the pull cord case cover. now im pretty sure ive got a bad crank seal on the left side of the motor. do you know of any way to test this without a 2-stroke leakdown tester? i just dont have one yet. but im pretty sure this is my problem now.
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Old 08-02-2009, 12:52 PM   #11
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Re: lt50 compression??????

Originally Posted by tunil View Post
wow really, even for a 2-stroke i thought this was low. maybe not. i will keep trying different things then. thanks for your help
When I saw 5.6:1 in the specs I was impressed you even got 90psi :-)
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Old 08-02-2009, 7:00 PM   #12
 
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Re: lt50 compression??????

Originally Posted by tunil View Post
well i think i just found the problem. im tired of pulling this thing so i tried some starting fluid directly into the cylinder. it almost kicked off but not quite. i noticed when it tried to start that smoke was coming out of the pull cord case cover. now im pretty sure ive got a bad crank seal on the left side of the motor. do you know of any way to test this without a 2-stroke leakdown tester? i just dont have one yet. but im pretty sure this is my problem now.
sorry no, i dont think there is any other way other than just replace it or buy the tester
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Old 08-02-2009, 7:06 PM   #13
 
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Re: lt50 compression??????

o and of course if it is leaking dont run it for a long time as the leak allows extra air to be drawn it making it run lean
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Old 08-04-2009, 4:37 PM   #14
 
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Re: lt50 compression??????

took it apart and found the left side crank seal completely out of the hole its supposed to be in. its all chewed up as well. just ordered a new one for $3 plus shipping. this should solve the problem. i just hope the right seal is also good. ill find out when i put this side back together. thanks for all your help everybody. ill post again when its in.
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Old 08-04-2009, 9:52 PM   #15
 
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Re: lt50 compression??????

Originally Posted by tunil View Post
took it apart and found the left side crank seal completely out of the hole its supposed to be in. its all chewed up as well. just ordered a new one for $3 plus shipping. this should solve the problem. i just hope the right seal is also good. ill find out when i put this side back together. thanks for all your help everybody. ill post again when its in.
thats what were here for.. good luck that should fix er up
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