2003 Yamaha YZ 125 Logo

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thomas Posted on Nov 02, 2011
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What piston goes in a 1989 yz 125 - 2003 Yamaha YZ 125

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john morgans

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  • Expert 339 Answers
  • Posted on Nov 04, 2011
john morgans
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1answer

1989 yz 125 has a flat piston or dome piston

hiya

flat piston

hope this helps

John
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I have a 2000 yz 125. Melted a hole in the piston but didnt score cylinder. Replaced top end. Wont start. Has good fire. Crank case oil was a little grey. New plug,fluids,fuel.

I would be checking compression it may not be visible score on cylinder but it does not take much to loose compression on small bore motor with one piston ring and 11 years old
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My yamaha yz 125

if your getting spark than i would take the carb off and clean it you could have a cloged jet.( just because your getting fuel from tank to carb dont mean its getting from carb to jug) i would try that first......yz-maniac.
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Yz 125 bog

Sounds too lean to me or lacking fuel.

Partially blocked jet in carb. May have to remove / clean.

Check also that carb butterfly / piston is travelling to full open position.
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2004 yz 125 std bore size,and what size do the pistons go up in,thanks

The std bore is 54mm and some available piston sizes are (Vertex Pistons)

53.93
53.94
53.95
53.96
53.97
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YZ 125 Keeps burnig piston & Ring on Exhaust side cant find problem on 4th or 5th piston & ring

only reason would be your running too lean. which causes more heat, which causes pre-gnition and pinging. Also if timing is off you create more pressure which in turn causes more heat
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