Maintenance & Technical > KX500 Original
Powerband too short
81cr450:
--- Quote from: Foxx4Beaver on July 06, 2013, 12:46:42 PM ---another thing you can try for the surging...is adjust the idle screw so that it WON'T idle....I learned this off this site a while back because mine used to surge like mad.....it didn't completely stop the surging,but it made a huge difference.
--- End quote ---
That surge can be eliminated with the powervalves not over closing Foxx.
Foxx4Beaver:
mine don't over close...and from watching Gages videos,his weren't either.
it's just in the K5s nature to surge at some degree...some do it worse than others.
take an old YZ490 for instance....I rode a friends 82 that would shoot me right over berms every time.
Gage:
For a 88mm bore would my head needed to cut to fit? If so maybe that's the problem I have.
Pmcg:
I bought a motor that had an 87.5 piston and stock head. As a result the head gasket went and the front of the piston was destroyed. I have a picture somewhere ill see if I can find. But I would say you defineately should modify the head to fit. Site sponsor Pinsonnault racing did mine.
Foxx4Beaver:
--- Quote from: Gage on July 07, 2013, 02:27:35 AM ---For a 88mm bore would my head needed to cut to fit? If so maybe that's the problem I have.
--- End quote ---
that's a pretty important piece of info you left out in the beginning...I agree with Pmcg...you should have the head cut/matched....but I'm still not sold on that being 100% of your problem....you still have jetting issues that need to be fixed.I don't know if anyone on here is running a 165main,that's just too lean...I run a 168 and that's on the lean side,but my bike hardly ever sees WOT,so I can get away with it....and your low circuit jetting is causing your black oil/spooge problem.
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