Question about 2005 kawasaki KX 250

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Polish and port

I have a kx250f and i was wondering wat precautions i should take and is therea certain way i should do it

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Take some duct tape and put it around the shape of the new port opening. Now put on a second layer of duct tape. This does two things. First it outlines the size and shape of the revised port, and second when the rotary grinder skips out of the port, (as it is going to do a bunch of times), the grinder bit won't nick up the cylinder wall.

The only polishing needed is on the face of the new port area. Give the burned gas a smooth exit into the exhaust pipe. Don't go too extreme on the changes. Too much and you loose performance. This is the voice of experience talking.

Please rate this answer. Thanks!

Posted on Apr 16, 2009

  • tombones Apr 17, 2009

    The intake port gets the same polishing

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Wash parts an blow clean really well after any polish / grinding

really don't know why would when KIP's give it the most power stock

bolt on power try some boysen reeds

if motor is tried an beat freshen it up with

over size jug to 265cc with wiesco piston kit an
la sleave to bore out jug with cast sleave

Posted on Apr 16, 2009

  • mr Overland Apr 17, 2009

    yes never open the top part of exhaust port cause will loose compression if do so. same for intake runners just smooth ex / in channels



    forgot to ask is cyl jug within service spec to warrant the work

  • mr Overland Apr 17, 2009

    sorry wrong link for wiseco here is the correct piston kit PK1238

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