It will work on any Yamaha Jog or Spree motor for certain, as well as on the Derbi engines. probably many more also, but especially well mon the Jog, etc. Just take of the 4 bolts holding the exhaust, place the flange end up into a vise, etc. and carefully expand the exhaust bore be 6-8m.m. That's it! Also, make it or any auto mix 2-stroke motor run cooler, better with "Synergyn" oil. It'll blow your mind.
Re: What was it?
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