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Author Topic: Too much smoke?  (Read 4686 times)

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Offline Stormer

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Too much smoke?
« on: May 06, 2013, 04:12:35 AM »
I have a yz125 and its always been smoking a shit ton. I used to run 32:1 but switched to 40:1. I cleaned the air filter and re-oiled. I'll be cleaning the carb this saturday. The compression seems to be low so Im gonna check that out as well. No idea what the hours are on the top end but maybe that could be the problem? It smokes alot at 3/4 to full throttle. A jetting kit could probably help but what do you guys think.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline TotalNZ

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Too much smoke?
« Reply #1 on: May 06, 2013, 05:20:28 AM »
Sounds like your right hand side crank seal is leaking.
Is it using trans oil?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline eprovenzano

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Too much smoke?
« Reply #2 on: May 06, 2013, 01:22:30 PM »
If you don't know the hours on the top end... well I'd start there 1st.  You can adjust the jetting, but the real issue I'll bet is a worn piston and ring.  Its time to refresh the top end.  While you have it apart, you may consider replacing the crank seal as well.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Eric Provenzano
2019 KTM 300 XCW TPI
2000 KTM 300 EXC (Son's)
2001 KTM 380 EXC
Sold 1991 KDX 200... fun play bike
Sold 1999 KX250
Sold 1999 YZ125 (son's)
Sold 2001 Yamaha TTL 125 (son's 1st bike)
Sold but never forgotten 1974 Honda Elsinore CR250M
Sold 1974 Honda Elsinore CR125
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