Maintenance & Technical > KX500 Original

Porting

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hughes:
Is their any porting I can do myself on the intake side of the motor :?:  :?: Anybody have pictures of their own porting?

KXcam22:
Hughes,
  I am not sure how close your cylinder is to my 92 but on mine there was a fair bit of work I did to remove casting flaws to smooth the flow.  Took a few hours but increased the bottom end noticeably.  Look at where the booster ports from the sides of the intake flow down into the main transfers. Also I had bulges in the outside walls of the main transfers (a main flow area), which I smoothed. I did not change any actual port timing.  If you are interrested I can tell you how to build an easy tool for your grinder for polishing. Cam.

Danger4u2:
Cam, lets see your home made polishing tool please.

Danger

KXcam22:
Danger,
  It's pretty simple and others may use a similar one. Get a long 6" to 8"  1/4" diam grade 8 bolt, cut off the head and threads to get a straight shaft. Cut a hacksaw blade width slot straight down on end of the shaft about 3/4" deep.  Fit the shaft in the 1/4" chuck of your mini grinder.  Take 12" long strips (can be varied) of 1" wide emory cloth (fine 240 or 320 grit) , put one end in the slot and roll the rest around the shaft in the direction your grinder spins.  Place the roll inside the port and let er fly. As the emory grit wears the cloth comes off always leaving an emory edge to polish with.  Wear eye protection and a dust mask and do it outside as it is a bit messy.  Fast and easy and does a great job.  The length makes it easy to reach deep into ports. The depth of the slot should aways be about 1/4" less than the width of the emory cloth you are using. Hope you can understand my description- can post a pic if needed. Cam.

hughes:
Thanks, I am tearing down the engine this winter for complete rebuild and replating. So am going to clean things up alittle.

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