KX 500 Flat on Mid and top end

[Motorrad]

where did you measure the piston BTW?

you know Pistons are egg shaped from front to back right?

measure them, you would find that many pistons are as much as 0.010" out of round.  (all bikes)

[lsampson]

sorry about that, so what is the best way to check piston-wall clearance? I used a feeler guage, slid it between the piston and the cylinder on the intake side of the jug, and let to drop to around mid-bore,  and came up with .127mm with the new wiseco. The box states .100mm is the clearance on the box.

[lsampson]

I measured on the skirt, 90 degrees from the wrist pin. Thank you for the help. I'm not totally ignorant to this stuff, but this one has me stumped.

[Motorrad]

I measured on the skirt, 90 degrees from the wrist pin. Thank you for the help. I'm not totally ignorant to this stuff, but this one has me stumped.

have a camera?  Im curious what kidn of shape the CYL is in...    

the more and more we dig on this.   the more and more you need to go to a local machine shop and have a bore guage stuck int hat thing... 

somthing aint right.



or if your local to san diego.       We can do it.

[lsampson]

I will try to take a pic, and like I said I'll be measuring the bore tonight. The cylinder looks good. I can still see the cross hatching in the walls in most places, and no significant gouges

[Motorrad]

I will try to take a pic, and like I said I'll be measuring the bore tonight. The cylinder looks good. I can still see the cross hatching in the walls in most places, and no significant gouges

yea. lets wait till we have that measurement before we jump to any conclusions.

[lsampson]

Thanks again for the help. I'll let you know what I find out.

[Motorrad]

Thanks again for the help. I'll let you know what I find out.

curious. what you goign to be using the bike for?   colorado singletrack?

[lsampson]

Just amateur hillclimbing in NW Colorado. Putting around. Thats about it. How did you know I lived in Colorado?

[Motorrad]

Just amateur hillclimbing in NW Colorado. Putting around. Thats about it. How did you know I lived in Colorado?

Magic admin tools. 

[motopunk]

Just amateur hillclimbing in NW Colorado. Putting around. Thats about it. How did you know I lived in Colorado?

Magic admin tools. 

motorrad is the man,who knows everything ...   

and i agree to him.first you have to measure your cylinder and then its time to find out the right piston size. motorrad is a great guy and will help you to find the right piston.

[lsampson]

Copy that motopunk. Thank you for all your help as well! Its blizzarding here as we speak, perfect timing to figure this bike out! I hate it when the bike is down and the day is perfect for riding!

[Motorrad]

Copy that motopunk. Thank you for all your help as well! Its blizzarding here as we speak, perfect timing to figure this bike out! I hate it when the bike is down and the day is perfect for riding!

you can keep all that white stuff. 

[lsampson]

I'm ok with it since I have a 2012 Ski Doo! But I am ready for it to be bike season..

[sandblaster]

It's a shame we couldn't take all the information in Motorrad's head and store it in a neatly filed spread sheet form.
Then you could simply click on the info you needed
Like this: