My lads 04 beta rev 50 was running well but kept oiling plugs up, so i altered the fuel mix messed around with the carb but the rear silencer was oiling up all the time. No matter what I did to the bike it always ran well but smoked alot.
I had the bike for four months or so and dropped the gear box oil and guess what, no gearbox oil so thought the promblem was crank seal.
Took it all apart, took the crankseal out, it was in backwards and it has a tiny little lip on the seal which had been torn when fitted in the factory( I surppose) put the new seal in, run the bike at 70:1 semi syn and a 6 plug and the bike has never run better it revs out really clean and now the best bike he has had , happy days, AS with all kids when the bike is not running right its the dads fault!!!!!!
