rabbithounds
Member
- May 23, 2007
- 15
- 0
Is it really necessary to do the frequent top end rebuilds on a 2 stoke? See below for the long winded Version.
We have a KX60 bought new this year as it was left over on the showroom from 2003. It has - I'm guessing 60 + hours on the original top end (likely more). Compression is 110 pounds. It has lost considerable power, put still hauls butt with a 50# rider. I took it apart at ~ 30 hours and it looked perfect lots of lube all over. Piston and skirt looked great, cylinder walls great with al the original cross hatches still visible. I put it back together just like it was with new circlips. BTW -Circlips are a pain - any suggestions?
I'm reading all these very avid professionals that recommend these little motors be rebuilt at intervals as little as 5 hours. From my experience thus far I would think this is overkill. The Clymer service manuel says the service limit for compression is 109 pounds. this is pretty much where the bike is currently so I am going to install a new top end tomorrow.
This is our first 2 stroke, but I would like to get rid of my xr250 ang get a kx125 or kx250 for myself. But are hesitant still wanting to see how the current 2 stroke hold up. My son rides this little bike pretty hard now and revs the pi-- out of it. Started off slow, but the last 30 hours have been fully in the power band. Just to give an idea - he's going thorugh 5 gallons or more of 32:1 mix a week.
So again-
Is it really necessary to do the frequent top end rebuilds?
We have a KX60 bought new this year as it was left over on the showroom from 2003. It has - I'm guessing 60 + hours on the original top end (likely more). Compression is 110 pounds. It has lost considerable power, put still hauls butt with a 50# rider. I took it apart at ~ 30 hours and it looked perfect lots of lube all over. Piston and skirt looked great, cylinder walls great with al the original cross hatches still visible. I put it back together just like it was with new circlips. BTW -Circlips are a pain - any suggestions?
I'm reading all these very avid professionals that recommend these little motors be rebuilt at intervals as little as 5 hours. From my experience thus far I would think this is overkill. The Clymer service manuel says the service limit for compression is 109 pounds. this is pretty much where the bike is currently so I am going to install a new top end tomorrow.
This is our first 2 stroke, but I would like to get rid of my xr250 ang get a kx125 or kx250 for myself. But are hesitant still wanting to see how the current 2 stroke hold up. My son rides this little bike pretty hard now and revs the pi-- out of it. Started off slow, but the last 30 hours have been fully in the power band. Just to give an idea - he's going thorugh 5 gallons or more of 32:1 mix a week.
So again-
Is it really necessary to do the frequent top end rebuilds?