Hey i have a 300 ex and wanna squeeze some more outta it. i am thinkin about boreing it out 80 over. i got a piston kit from wiesco lined up.. i was just wondering if anyone has this or rode one with it done.. does it give a little more juice? i want to run a kinda radical cam but cant find one that floats my boat.. any help would be awsome.. thanks

 

Put that bore money and the price you'll get for your 300 and buy a bigger bike. Boring it out is not going to give you a reasonable power gain for the money. You can find 400 ex's out there for a dime a dozen. I'm not a fan of the 400 either as far as power goes but it will be much more than a bore job on your 300. JMO.

 

boring it out will give you alot more low end! as far as top end you need a longer stroke! try a high compression wiseco piston maybe port and polish. ill guarenty you will notice alot of gain, top and bottom. that is the only way to gain power. there is no replacement for displacement!!!