Maintenance & Technical > KX500 Original

1988 KX500?

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chipped tooth:
Sounds simple enough,  just looking at options.
I see the 88 has shorter stroke bigger bore!

dave916:

--- Quote from: chipped tooth on April 25, 2017, 06:54:22 PM ---Sounds simple enough,  just looking at options.
I see the 88 has shorter stroke bigger bore!


--- End quote ---
?
86mmx86mm all years
main differance between 88 and later year
1/ different barrel%and head {no center kips on 88}
2/ slightly differant angle on the carb boot
3/ lighter flywheel on 88/ differant stator cdi coil
4/ slight differances in cases / 88 has more case volume and no hole for the centre kipps

porting specs are very similar all years 1986 on 
Advantages of the 1988 barrel /no issue with cracking exhaust bridges / bigger water ways and bigger kips chamber and a smooth exit out the main exhaust port {which suit anybody looking to go bigger on the bore

umberto:
I think he was referring to the post by motopunk at the end of that other thread.  I think he (motopunk) may have been confused and thought I was talking about my 250.

chipped tooth:
Yup, I was reading the post and didn't think.... Long day lol

I'm just collecting as much info as I can before I tear it down.

Has a friend over that thought it was a 125 by the size of the pipe, he doesn't know much about anything mechanical.

Sorta got me thinking, I know the yz490 are "under piped" causing issue.
I wonder what other options other than the mass produced pipes are out there without having to go custom....

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