Question about 2003 Yamaha YZ 125

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Hey mate , got a YZ 125 02 was riding the other day and its just had a full enghine rebuild ,clutch stopped working and it wouldnt go into first gear but would go into second . is this because second has a syncro??? thanks

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Dont do a hole lot on bikes myself but id try bleeding the clutch

Posted on Sep 07, 2010

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I wonder if the clutch "basket" broke off an "ear"?...I hate to say it,..but you might be in for a tear down and rebuild. Start with the parts you can access, clean/fix/replace with motor still in bike..eg; clutch plates/basket, "properly" fix the kickstarter spring/gear unit,...try to find thae cause of the metal filings,..check the clutch basket..etc. GL. [re-post with what's going on].

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Wont ride in any gear


hey mate, the first thing i would check is the drive belt and associated idler pulleys make sure these are all in tact and free from grass build up also check belt alignment ensure it is on the pulleys still and belt guides in tact and check belt for cracking and excess length(stretching), if all of this appears okay i would probably say that the problem is internal in the gearbox and would recommend taking it to your local small engine mechanic

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yz 250 two strok. measur your compresion. gas leak valve gasket cilinder. of your exhaust pipe full whit carbon. a good running 2stroke have a lot of power in al the gears. when is your last inspection of the engine? j kerkhof

Aug 02, 2009 | Yamaha YZ 250 Motorcycles

1 Answer

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

1 Answer

2003 yz 125 clutch


This sounds like dirt and grit in the oil is causing the clutch to grab. Change the gearbox oil. Ride the bike for a couple of hours using the clutch often. Now drain the oil again and put in fresh oil. This will flush out the dirt and grit. Use 10w40 motor oil. Stick with the major brands; Pennzoil, Quaker State, Mobil or Shell. Do not use synthetics or oils with "special" additives.

Other possible causes are > a need to adjust the clutch lever for 1/4" free play at end of the lever > warped clutch plates or friction plates > Clutch has been worked on and assembled wrong > low oil level in the gearbox > frozen clutch hub bearing > Incorrect clutch cable being used.

Please post a comment after the double oil change. The 2x oil change is a cheap way to eliminate a possible cause and hey, it isn't gonna hurt anything. If you still have the problem I can help with a clutch rebuild.

Jun 04, 2009 | 2003 Yamaha YZ 125

1 Answer

YZ not starting


I don't think this is a float issue. One way to check is to turn the gas off, take the bowl off the carb, hold the float up, and turn the gas back in. If fuel flows, the float needle is toast. It sounds suspiciosly like a worn topend, but it could also be a clogged jet ot fuel filter, or a faulty CDI.

Nov 10, 2008 | 2003 Yamaha YZ 450 F

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