ok so i went and bot a Ski-Doo Legend 380 and it was ok it was a nice little sled but i blew the engine it just dint have anofe power so i let it sit for along time and then my friend was bragging about how he could do 100 mph on his sled big deal so i went and bot a rotax 503 and made it fit and work its just like it was it has all the 380 plates on it and i worked to find stuff to make it fast well i have got my 503 doing just about 100 mpg but it wont make power at all i don't no what is wrong with it i have tried everything would the magneto be a problem

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Haha