Question about 2003 Yamaha YZ 125

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My yz 125 cut out when i put it into gear! why?

Its a 2000 modle and it is low on compresion

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  • 64 Answers

The piston and rings have to be replaced if you haven't done so in the last 100 hours of riding.

Posted on Jun 23, 2009


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I have 2003 yz 125 it runs teriffic and shift's grate 1-5 but it wont go in to 6st gear . any ideas

Well - you will first have to buy an earlier model to get into 6th gear. The 2003 YZ 125 is a 5 speed transmission. There's nothing wrong with your bike.

Feb 17, 2011 | 2003 Yamaha YZ 125

2 Answers

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.

May 14, 2010 | 2004 Yamaha YZ 125

1 Answer

I have a 1985 yamaha yz 125 wont start

By what you have written,I take it the motor still turns over.Take the spark plug out and see how much compression you have.If there is very little,it may have been the piston seizing.When they cool down,they can sometimes be moved again.This is the most likely cause of your troubles.If you have compression,take the s/plug out,put the bike in first gear and see if you can turnover the motor AND g/box.What you are looking for is a broken part in the g/box that locked up the driveline.Do this in each gear.Sometimes you can take the pipe off at the head and see into the combustion chamber through the exhaust port.Otherwise the head needs to come off.Hope this helps you

May 11, 2010 | 2003 Yamaha YZ 125

1 Answer

Yz 250

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

2 Answers

I have a honda cr 125 with no compression dp u no wat it is and its a 98 modle

its one or more of the next few things. bad rings, bad head gasket, hole in piston

May 05, 2009 | Honda XR 650 R Motorcycles

1 Answer

What oil for yz 125?

I would use maxima mt 75w gear oil in all 2-stroke trans.

May 01, 2009 | 2003 Yamaha YZ 125

1 Answer

1997 yamah yz 125 lots of white smoke comeing out of pipe

How much was it smoking previously? Too much smoke (oil) is a whole lot better than not enough smoke (oil). If you are mixing the oil and gas then cut back on the mixture. Obviously it is out of balance. Put 1/2 gallon of raw gas in the tank to cut the mix. After a tank or so you should get the balance back.

You need a new shift shaft and probably need a new shift lever due to the bad splines. You can try the JB Weld but I suggest that you go ahead and drill the lever an shaft then put in a cold roll split pin from the hardware store. You have nothing to loose since the shaft and the lever are already toast.

Please rate this solution. Thanks!

May 01, 2009 | 2003 Yamaha YZ 125

2 Answers

Yz 125 2001 stays in gear when clutch pulled in

Lose the Honda transmission oil. It may have swollen the cork on the friction plates. Go with 10w40 in the gearbox. Any major brand; Mobil, Shell, Quaker State, Pennzoil, etc.. Try the new oil and give the cork a week to shrink back down > if they will. You may need to put in a new set of plates.

Apr 17, 2009 | 2003 Yamaha YZ 125

3 Answers

Removing water pump impeller

you might have to split the case to get to the back side of the impeller.

Mar 28, 2009 | 2004 Yamaha YZ 125

1 Answer

Yz 250 1992 wont kick start

check your compression I had a 94 yz that done that when i checked the compression it was really low so I put new rings on the piston and that's all it took to bring her back to life

Feb 03, 2009 | 2000 Yamaha DT 125 R

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