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Damaged cylinders can be repaired by welding and re-machining before plating.

Power was rated at 120 hp, but the sound was what hooked riders.

This in turn has led us to the development of our own proprietary formulas for calculating the correct intake, transfer and exhaust areas for increased power levels.

Also for us, EFI was the choice for fuel delivery on upcoming 2-stroke engines and the difficulty in developing and calibrating a 2-stroke multi pipe engine with EFI is much more difficult than a single pipe due to the variation in pipe volume in mass production.

00 Cylinder Re-Sleeving New sleeves are bored and honed to piston size.

While single stage reeds compromise low end smoothness for top end power, the double stage system delivers both.

Yamaha bumped up the 4-cylinder displacement in 1995 to 791cc putting out close to 150 hp.

If you wanted to convert your 1000 to use carbs we have a conversion kit that will allow you to do this again this is a race application only.

The over-square triples bore diameter larger than stroke length could now rev higher and that typically meant more peak HP.

With these improvement from Rotax it picked up an extra 20cc which is about 6-7 HP.

On the race track the hp race was escalating when the 634cc and 744cc twin-cylinder race sleds emerged.