Question about 2003 Yamaha YZ 125

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Stuck in first gear 2001 Yamaha YZ 125

My 2001 yz 125 jammed in the first gear a few weeks ago, I had to get it home that why I couldn't get it out of first when I got home I messed about a while now [any ideas thx ] @

Posted by Bobyy Devine on


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SOURCE: 1999 yz 125 service or owners manual and or

these both have detailed pdf files you can look at.

Posted on Mar 26, 2009



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SOURCE: what oil should i have in yz 125 2 stroke

The clutch and gearbox share the same oil. The oil for the motor is 10w40. Stick with the major brands; Pennzoil, Quaker State, Mobil, Yamalube or Shell.

Posted on Apr 19, 2009



  • 44 Answers

SOURCE: what spark plug for yz 125?

I have a dennis kirk book, the correct spark plug is a --BR9ES--(NGK)

i always used SAE 10w-30 oil on all my dirtbikes,
no transmission fluid

for the chain you should move the back tire back until the chain is at a snug tension

Posted on Apr 24, 2009


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SOURCE: How much shuld I ask for???

Without bent forks the bike would sell for about $1500. With the shop charge of $900 to fix the forks and a buyers hesitation to purchase a bike with problems, it will probably sell for $500 as a fair price.

I don't get paid for my answers but I do take pride in them, and I am only trying to help. So if you will, > > A “very helpful” rating for this answer? Thanks!

Posted on Jun 13, 2009


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SOURCE: how do i decode yamaha yz 125 engin id number

You don't decode it. It is only a production run series number. Mororcycles are like cars in that respect. It is the frame number, AKA the "VIN number", is what carries all the information. Call a dealer with the frame number and he can tell you year, paint color, specific model and more. They may have a problem if the bike is too old. Yamaha changed to a newer code system a few years back.
Can I get a “very helpful” rating on this answer?

Posted on Aug 28, 2009

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2001 yamaha yz 125 motor seized

If the clutch drags you need to check the plates and the worse thing to do when a bike wont crank is to pop start it you just do more damage and defiantly only use the right oil

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On my yz 125 my kick start is jammed

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99 yz 125, just put a new crank and new gaskets, ran great, readjusted the timing after initial break in, still ran great, a few weeks later its missing at top end, and sounds like it jumps immidiatly to...

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Jul 11, 2009 | 2003 Yamaha YZ 125

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Will main clutch casing fit yz 125 2001 from 1997?

Hey Ryan! Long time since hearing from you.

When you say "main clutch casing" do you mean the right side cover for the gearbox or do you mean the primary driven gear (AKA "clutch basket") that the clutch boss (AKA "clutch hub") and all the clutch plates fit into?

If you mean the right outer casing > they are slightly different, '97 pn 4JY-15431-10-00 and 2001 pn 4JY-15431-12-00. The entire clutch is the same from 1997 through 2001.

Jun 07, 2009 | 2003 Yamaha YZ 125

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