KX Riders

Maintenance & Technical => KX500 Original => Topic started by: Apoole6 on January 27, 2018, 08:56:59 AM

Title: Need a 1988 KX 500 crankshaft
Post by: Apoole6 on January 27, 2018, 08:56:59 AM: I recently purchased my second KX 500. It had issues when I bought it, he crank has side to side play which I know usually means a spun bearing or such.

I can't for the life of me find a crankshaft for an 88 model.

Any info on compatability,if anybody has one they could get rid of, or any suggestions on what I could possibly do to get this bike running would be much appreciated.

Thanks!
Title: Re: Need a 1988 KX 500 crankshaft
Post by: Apoole6 on January 27, 2018, 01:55:14 PM: I have cash in hand and willing to pay top dollar for one if somebody has one.
Title: Re: Need a 1988 KX 500 crankshaft
Post by: sandblaster on January 27, 2018, 03:23:30 PM: Yep... That crank is a one year only.
Here is some info that might help you..

http://www.oem-cycle.com/forum/viewtopic.php?f=49&t=344&start=10 (http://www.oem-cycle.com/forum/viewtopic.php?f=49&t=344&start=10)
Title: Re: Need a 1988 KX 500 crankshaft
Post by: dave916 on January 28, 2018, 02:40:06 AM: Quote from: Apoole6 on January 27, 2018, 08:56:59 AM
I recently purchased my second KX 500. It had issues when I bought it, he crank has side to side play which I know usually means a spun bearing or such.

I can't for the life of me find a crankshaft for an 88 model.

Any info on compatability,if anybody has one they could get rid of, or any suggestions on what I could possibly do to get this bike running would be much appreciated.

Thanks!

Any year crank will fit the 88 88-2004
86/87 u would also do but you would need the primary gear / nut / keyway
86 is heavier

U could weld/regrind the journals on your own crank

IT also could have spun the bearing in the cases
Title: Re: Need a 1988 KX 500 crankshaft
Post by: Apoole6 on January 28, 2018, 12:32:20 PM: Are you sure? Has anybody done this before? Just don't wanna dump more money and have it not work out. Thanks!
Title: Re: Need a 1988 KX 500 crankshaft
Post by: umberto on January 28, 2018, 03:43:20 PM: Dave916 knows a lot about the 86-88 500s. I asked him so many questions when I was building mine. The 88 motor actually shares a lot with the 89 and up motors, with the cylinder (KIPS) being the major difference. The cases are pretty similar too. I actually bought a set of 89 and up for mine to keep as a spare set (thanks to Sandblaster). The 86-87 motors have a lot of similarities, but not much carries forward to the newer models besides the cylinders, which can be made to fit.
Title: Re: Need a 1988 KX 500 crankshaft
Post by: dave916 on January 28, 2018, 10:25:04 PM: Quote from: Apoole6 on January 28, 2018, 12:32:20 PM
Are you sure? Has anybody done this before? Just don't wanna dump more money and have it not work out. Thanks!

Yes i am 100% sure any 88/2004 crank will fit / {Circlip primary gear }
88 looks a little differant because of balance holes on ether side rod conrod /89on crank is just countersunk more in that area {they are the same weight}

Probably 70% of all secondhand kx cranks will have a worn journal/ look for shiny journal
Title: Re: Need a 1988 KX 500 crankshaft
Post by: Apoole6 on January 29, 2018, 07:18:35 AM: Thanks! Found a new 89-04 crank assembly for about 500 so I think I'm gonna try to go with that.