Maintenance & Technical > KX500 Original

kx5 biggest bore

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YUNGGUNNAZ:
saw on a post here awhile back on the subject of big bore #'s like 540 and even 6 something kits by the way of stroking but no other detail info.
would like to find more on this since we sand drag alot here.

gowen:
If you are sand draging, there is no need to up past 2mm overbore (520) due to the fact that the more bore you have, the lower the powerband.

I sand drag my KX and am untouchable with a 520cc kit. There are other parts you can get to increase your performance in the sand besides a huge ass bore.

YUNGGUNNAZ:
gowen, where do you race at?there doesn't seem to be many tracks here in Va. doing this.i really like to explore any other combinations to see its merits or down falls at a mechanics point of view.untouchable uh?wait til I tell katie!lol

Brett:
Don't bother inceasing youre bore size untill you have to due to wear.  Sand drags not that i do them myself i am sure the things you should be looking at are: port timings, make wilder by lifting barrell or porting; compression, increase via machining cylinder or head; expansion chamber, find the biggest in diameter you can get your hands on; and then tune carby to suit.  All these things will give you a motor that has a s**tload more topend power that will be in a narrow powerband and give violent power delivery.  Leave the bore size alone changing from 500cc to 520cc is only about 4% increase in power statistically but why f**k up a perfectly good cylinder for meager returns.

YUNGGUNNAZ:
brett,all of what you spoke of has been done.cylinder ported,head reworked,2mm over,jemco pipe(two of these as one was builted in 91)and other tricks.but i am always looking for more.willbe trying something new this weekend at the last drags.here is site for race,www.bikerenews.com.dirt drags

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