07-20-2010, 10:46 PM
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Join Date: Oct 2003
Last Online: 04-14-2014 09:07 AM
86, or 87 cylinders work well for that. get an 85 head (more compression).
use as light a flywheel as you can for sand, without stalling on the starts. Plan to go up on your octane. your bike would like leaded fuels. drop the pj carburetor for a pwk that is larger. the kaw 500's came with a 39.5 that is really good. there are 40mm ones available. for sand dragging bigger is better and you can make that one bigger (cubic inches). I don't like those for any other riding, but hill climbs and dragging it works well on.
you can mill any of the heads to work fyi.
Porting is next, and unless you want to buy some cylinders and play with raising the exhaust port and then the transfers I would leave that to someone who knows that engine. if you want to try it, just start by raising the ports by using a spacer under the cylinder. .030" to start with and 010 after that is where I would start. then you will need to mill the top of the cylinder to get back to the original deck height. sooner or later the head will get milled even more.
speed is power, power is money. how fast do you want to go?