Maintenance & Technical > KX500 Original

86 bottom end with 88 top end

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don46:

--- Quote from: kwakman on April 11, 2012, 03:48:57 AM ---hold up. you said 86 to 88 on 89 on bottom end? No problem whatsoever. sorry, I read that wrong.if you mean old bottom end to new cylinder you need to check your 86-88 cases against an 89 on gasket before you decide. don46 has the facts on this I believe he runs one on one of his engines, or has at some point....K.

--- End quote ---

Kwakman,

You are right you can go older top on a newer bottom no problem, to go the other way, would take alot of work and you'd have to be a heck of a welder and machinist. There are a few minor differences with the power valve governor, nothing earthshaking. the arm and drum are different, the pin in the arm is bigger, which come to think of it may be better.

jyeomans:
 Thanks , about the gaskets!

No, I just meant a 1988 top end mounted on a 1986 bottom end.
I was pretty sure that it was straight forward but I needed check to be sure.
I picked up my top end today from the post office, opened the package to find out someone stripped the power valves out of the cylinder when I paid for the valves to come with it.
Kinda bummed. But I called and they are gonna send me a carb for free.
I now have to track a set down, which from what I understand are hard to find.
Anybody have any suggestions on the best place to find a set?

kwakman:
your 88 cyl will go on 86 cases, they are same generation. Ask Sandblaster about power valves....

dave916:

--- Quote from: jyeomans on April 12, 2012, 06:42:13 AM --- Thanks , about the gaskets!

No, I just meant a 1988 top end mounted on a 1986 bottom end.
I was pretty sure that it was straight forward but I needed check to be sure.
I picked up my top end today from the post office, opened the package to find out someone stripped the power valves out of the cylinder when I paid for the valves to come with it.
Kinda bummed. But I called and they are gonna send me a carb for free.
I now have to track a set down, which from what I understand are hard to find.
Anybody have any suggestions on the best place to find a set?

--- End quote ---
A carb  is not worth as much as powervalves
 A 88 top end is worthless without good powervalves, seeing that they are not made anymore,
 how much did u pay for the 88 top end? and what did it included {i asume it came with the head as the 88head is completly differant to the 86

A 89on top end will fit 86/88 cases it just a matter of drilling a hole for the 3rd kipps idler gear

also make sure your 86 bottom ends is in good condtion , make sure there is no side play on the crankshaft, i usual try  sideplay with a large flat between crank webs and cases
good luck
 



 

jyeomans:

Well I was bummed about getting the valves stripped,but they were gone and the free carb made things a little better even though I know its not worth as much.
I paid $95 for the cylinder the head and it was supposed to have the valves. Not a bad deal I thought because parts are hard to find in my part of Canada. The whole package was in pretty good shape really.
Im very familiar with the L series kx 250's but this will be my first kx 500 build.

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