Author Topic: KX 500 Flat on Mid and top end  (Read 29358 times)

0 Members and 2 Guests are viewing this topic.

Motorrad

  • Guest
Re: KX 500 Flat on Mid and top end
« Reply #45 on: April 09, 2013, 04:30:01 AM »
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)

Offline lsampson

  • Full Member
  • ***
  • Posts: 72
Re: KX 500 Flat on Mid and top end
« Reply #46 on: April 09, 2013, 04:32:58 AM »
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.
« Last Edit: April 09, 2013, 04:38:41 AM by lsampson »
When in doubt, throttle out!

Offline lsampson

  • Full Member
  • ***
  • Posts: 72
Re: KX 500 Flat on Mid and top end
« Reply #47 on: April 09, 2013, 04:33:45 AM »
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.
« Last Edit: April 09, 2013, 04:36:02 AM by lsampson »
When in doubt, throttle out!

Motorrad

  • Guest
Re: KX 500 Flat on Mid and top end
« Reply #48 on: April 09, 2013, 04:38:49 AM »
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.
« Last Edit: April 09, 2013, 04:42:01 AM by Motorrad »

Offline lsampson

  • Full Member
  • ***
  • Posts: 72
Re: KX 500 Flat on Mid and top end
« Reply #49 on: April 09, 2013, 04:42:25 AM »
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
When in doubt, throttle out!

Motorrad

  • Guest
Re: KX 500 Flat on Mid and top end
« Reply #50 on: April 09, 2013, 04:44:29 AM »
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.



Offline lsampson

  • Full Member
  • ***
  • Posts: 72
Re: KX 500 Flat on Mid and top end
« Reply #51 on: April 09, 2013, 04:46:43 AM »
Thanks again for the help. I'll let you know what I find out.
When in doubt, throttle out!

Motorrad

  • Guest
Re: KX 500 Flat on Mid and top end
« Reply #52 on: April 09, 2013, 04:50:40 AM »
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?

Offline lsampson

  • Full Member
  • ***
  • Posts: 72
Re: KX 500 Flat on Mid and top end
« Reply #53 on: April 09, 2013, 04:57:49 AM »
Just amateur hillclimbing in NW Colorado. Putting around. Thats about it. How did you know I lived in Colorado?
When in doubt, throttle out!

Motorrad

  • Guest
Re: KX 500 Flat on Mid and top end
« Reply #54 on: April 09, 2013, 04:59:57 AM »
Just amateur hillclimbing in NW Colorado. Putting around. Thats about it. How did you know I lived in Colorado?

Magic admin tools.  :evil:

Offline motopunk

  • Hero Member
  • *****
  • Posts: 1,150
    • www.der-motopunk.de.tl
Re: KX 500 Flat on Mid and top end
« Reply #55 on: April 09, 2013, 05:20:44 AM »
Just amateur hillclimbing in NW Colorado. Putting around. Thats about it. How did you know I lived in Colorado?

Magic admin tools.  :evil:

motorrad is the man,who knows everything ...    :wink:

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.
big 2 stroke bikes are weapons for real men, who don´t fear death or devil. ;O)
´83 kx250, ´87 kx250 (with 360 big bore), 87 kx500, ´93 kx500 sfc

---  www.der-motopunk.de.tl  ---

Offline lsampson

  • Full Member
  • ***
  • Posts: 72
Re: KX 500 Flat on Mid and top end
« Reply #56 on: April 09, 2013, 06:30:36 AM »
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!
When in doubt, throttle out!

Motorrad

  • Guest
Re: KX 500 Flat on Mid and top end
« Reply #57 on: April 09, 2013, 06:34:32 AM »
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. 

Offline lsampson

  • Full Member
  • ***
  • Posts: 72
Re: KX 500 Flat on Mid and top end
« Reply #58 on: April 09, 2013, 06:38:39 AM »
I'm ok with it since I have a 2012 Ski Doo! But I am ready for it to be bike season..
When in doubt, throttle out!

Offline sandblaster

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 8,271
    • OEM-CYCLE QUALITY USED PARTS
Re: KX 500 Flat on Mid and top end
« Reply #59 on: April 09, 2013, 06:56:53 AM »
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:

The four stroke engine: That's one stroke for producing power and three for wearing the engine out.