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Got a 2000 yz 80.Starts on 1 kick but its low on compression.Will new rings/pro-x piston kit improve.? Also the clutch wasnt fully dis-engaging.rode it about two more times and it quit working altogether.?any opinions...thanks

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  • 7 Answers

Yes it need a rebuild kit and for the clutch the plates are probably worn down

Posted on Feb 20, 2013

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Posted on Jan 02, 2017

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FoRdMaStEr
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SOURCE: 1997 yz 125 wont start, please help

2 stroke bike are very dependent on compression. and being a bike that is 12 years old my best educated guess is that the top end needs to be rebuilt. i usually have to have the top end done on my honda about every three years.

Posted on Jan 13, 2009

  • 3567 Answers

SOURCE: while riding my yz 125 it just died and won,t kick up again

  • If a hole in the piston then install new piston and rings. Next, clean the carbon off the head and install a new head gasket.
  • If cylinder wall is scared the piston has seized up. Pull the cylinder off and take it to the dealer. Have them bore the cylinder and return it along with a new oversize piston and rings.
  • While at the parts counter, get a new stock spark plug and a supply of Yamalube Two Stroke Motor Oil. You need to add 4 ounces per gallon when filling up. This will be a 32/1 gas to oil ratio. NEVER ride the bike without at least the needed 32/1 mix.
Please rate the solution as a "FixYa" if able. Thanks!

Posted on Mar 23, 2009

  • 86 Answers

SOURCE: how much is my yz 125 worth?

the retail value in good condition is approx $1,500. meaning it looks good, runs good, good tires, breaks,chain and sprokets. but with the extras you have and the after market up grades, i would start with a little higher price.

Posted on May 21, 2009

co7196
  • 3433 Answers

SOURCE: kick start has no compression but runs fine once i get it going

Does it feel like yhe kick is even engaging and turning the crankshaft? Are you full stroking/kicking it over or short stroking it? when cold, are you using the choke. I suggest taking a compression test when it feels as if it hs no compression It could be undersized piston, rings, or a simple. good luck

Posted on Jun 12, 2009

ollie reece
  • 1167 Answers

SOURCE: Hello!, My Kawasaki KMX 125 (B11). I've just had a

hi mate did you replace the small end bearing when you replace the piston

Posted on Aug 26, 2009

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1 Answer

Dirtbike kick star


this happened with my sons pw50 where the piston ring had snapped and when it locked it was stuck bewteen the piston & bore

i would seek a shop or mechaninc to look at the top end and isnpect the piston & rings for wear or damage

dont keep kicking as this could result in further damage

Mar 20, 2014 | 2003 Yamaha YZ 125

1 Answer

I put a new piston into my 94 Yamaha yz125 dirt bike and when i tried to start it has low compressions


I had a similar problem check to make sure the rings line up right and if that dosent work let me know

Jan 02, 2013 | Boyesen Yamaha Yz125 Rad Valve Yz 125 1994

1 Answer

Kxl 110


Not sure by free wheels, does the motor turnover and seems to free wheel? If so, you may have very low compression in which the piston rings and or pistons may need to be changed, which is common if the bike is rode hard, the interval change is about 35 hours on these parts in most cases. If You kick the motor over and there is no tension on the kickstarter the spring may be bad.

Sep 03, 2012 | kawasaki KLX 110 Motorcycles

1 Answer

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

Mar 03, 2011 | 2003 Yamaha YZ 125

1 Answer

Kick starter has no compression, will not shift


hi, will the shift lever shift up when the bike is being pushed along, is it stuck in neutral, if its in neutral then push it down make sure it goes into 1st gear then can u get someone to push u whilst holding the clutch in then release the clutch and see if you can jump start the bike that way.

when you push the kick start down is it turning the engine over properly and if so if the compression is really to low then the chances are the piston ring has broke and scored the side of the cylinder if this is the case then you need to get new piston and rings and a new cylinder.

The problem with moto x bikes is they are high power and work at really high temp so parts need changing more often the piston rings need changing every 25 to 35 hours of riding time you need to do this as they ware and brake if used any longer.

you also need to make sure you get the petrol and oil mixture spot on as if its not getting enough oil it will blow the piston and rings so you need to measure exactly the correct mixture.

these bike are expensive to maintain and need new parts on a regular basis so remember this the next time you get the bike running

Mar 01, 2010 | 2005 kawasaki KLX 110

1 Answer

My 2000 300 exc it will still get into band but is gutless down low is that my rings


It could be worn out piston rings. But it could also be many other things, like: plugged up slow jet circuit in the carburetor, an air leak between the carburetor and the engine, excess carbon buildup inside the exhaust pipe - or in the exhaust port.
First, I would check the compression. WIth the gauge attached and the throttle held wide open, several good kicks of the kick starter should reveal at least around 100 psi of compression. If it's much lower than that, plan on new rings - or re-boring the cylinder to the next oversize and go with a new piston and rings.
And keep in mind that two stroke motocross engines are all relatively gutless at low RPM.

Dec 10, 2009 | 2000 KTM EXC 300

1 Answer

Hard to start when cold, low compression in kick starter


you might of burnt your pistons ring out and now they are not pressing against the edge of the cylinder

Jun 14, 2009 | 2004 Yamaha YZ 250 F

1 Answer

Kick start has no compression but runs fine once i get it going


Does it feel like yhe kick is even engaging and turning the crankshaft? Are you full stroking/kicking it over or short stroking it? when cold, are you using the choke. I suggest taking a compression test when it feels as if it hs no compression It could be undersized piston, rings, or a simple. good luck

Jun 12, 2009 | 2004 kawasaki KX 250 F

1 Answer

While riding my yz 125 it just died and won,t kick up again


  • If a hole in the piston then install new piston and rings. Next, clean the carbon off the head and install a new head gasket.
  • If cylinder wall is scared the piston has seized up. Pull the cylinder off and take it to the dealer. Have them bore the cylinder and return it along with a new oversize piston and rings.
  • While at the parts counter, get a new stock spark plug and a supply of Yamalube Two Stroke Motor Oil. You need to add 4 ounces per gallon when filling up. This will be a 32/1 gas to oil ratio. NEVER ride the bike without at least the needed 32/1 mix.
Please rate the solution as a "FixYa" if able. Thanks!

Mar 23, 2009 | 2003 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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