Maintenance & Technical > KX500 Original
Sleeve Transfer port matching
3Razors:
--- Quote from: kaw rider on September 10, 2010, 02:32:30 AM ---is it the left or right side rear transfer that has this.
--- End quote ---
Its on both the left/right side with the front/rear transfers, and also the auxillary exhaust ports seemed to have the same issue now that I remember. Also FMF did porting in the tunnels in this area, how high or if they raised them I do not know until I get home and measure it. One thing is for sure if the sleeve ports are not at least the dimensions of the stock cylinder something just isn't right imo.
kaw rider:
razor
you are right it's not right. you will have to degree the cylinder or get the height of the ports to see if the sleeve are at stock height or it fmf ported the tunnel roofs too high. I would just put a plated cylinder on it and sell that sleeve cylinder. with this being a low rpm motor its not as important.
3Razors:
Ok so here's some pics. Turns out the transfer and exhaust ports are the same size as stock. The intake ports have all been opened up quite a bit. The roof height on the transfers is higher than the sleeve by 1.5mm. From the top of the transfer to top of cylinder on both stock/fmf cylinder is roughly 69mm. Now my understanding is that all this portwork on the intake is basically useless because the transfers/exhaust ports are same as stock?
jonny500:
sounds like this cylinder was tuned (or Fu#*@d up) and then bought back to standard. it depends on what you require from your engine, personally i think the standard tune is fine and would not need any more. if you open the transfer ports you will change the peak power. i have some mathematical formulas so you can calculate the port duration , but its pretty full on
kaw rider:
razor
well the intake ports are a big problem on these cylinders. Whats done to that cylinder is a improvement from stock. don't raise the exhaust and raise the transfer.
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