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Message: [QUOTE="Jasle, post: 1283490, member: 26675"] nope the pipe is not allowed. the class is a "stock" class. the cobra OI comes stock with almost 9hp. The JR does not come with the FMF stock. Thats why you cannot compete with a bike that has 2.5Hp. Even with the pipe the bike is still WAY off in power. you need some head work and porting to get even halfway there. Then you are still suffering in the suspension area. I've even seen rip snorting 60 kits...Still don't compete! I don't remember any jetting tips but I do remember being several sizes big on the main. Save the $200 you'd spend on the pipe for a decent bike. Over on poliniusa a guy is selling a decent x1 for $650... just keep looking and you'll find a deal you can afford eventually. Just let him get as good as he can on the stock JR. You can drop thousands in the jr and still not be competative with the racers... [/QUOTE]