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  1. djcramond

    Very short stroke 250cc single! Advise appreciated.

    What rpm range will you be running the motor in.
  2. djcramond

    Extreme bore stroke ratio

    I started with a KTM 250SXF motor, this is a water cooled motor.I then destroked the crank and balanced. Machined material from the top of the crankcase and from the base of the cylinder. This got the piston back to the correct deck height. I removed 1 link from the cam chain, skimmed the...
  3. djcramond

    Extreme bore stroke ratio

    Hi Guys I have built a 200cc single cylinder 4 valve head motor the bore is 76mm and the stroke is 44mm. The motor runs real good and make quite good power from 6000rpm - 14500rpm
  4. djcramond

    4-VALVE HEAD - OPTIMUM PORT VELOCITY??

    what does you ignition timing curve look like

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