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Author Topic: 88 vs 90 kx500  (Read 1841 times)

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Offline Wilde1yamaha

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88 vs 90 kx500
« on: December 01, 2019, 01:15:23 PM »
Hey guys I'm almost ready to assemble my 1988 kx500 and put the track kit on, my question is are the 1988 and 1990 cases and cranks the same? I know the cylinder is way different but what is is different? Thanks
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Offline dave916

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Re: 88 vs 90 kx500
« Reply #1 on: December 01, 2019, 09:26:41 PM »
88 cases have more crankcase  volume/
88 cases boysen case port Wont match the 90 cylinder perfect
88 have no retainer on one gearbox bearing/ same size so no issue there
u need differant  lenght rear cylinder studs if  interchange 88/89 cylinders

Crank are pretty much the same 88/89 the just look differant /different method to balance/ holes vs countersunk area
 
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Offline Wilde1yamaha

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Re: 88 vs 90 kx500
« Reply #2 on: December 02, 2019, 02:28:32 AM »
Are the case halves the same besides the bearing retainer or are they different volume?
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Offline dave916

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Re: 88 vs 90 kx500
« Reply #3 on: December 02, 2019, 05:55:52 AM »
Quote from: Wilde1yamaha on December 02, 2019, 02:28:32 AM
Are the case halves the same besides the bearing retainer or are they different volume?
Differant volume / 88 had larger crankcase volume
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