480 kit???

[yernkie]

I am looking at an 05 450r with a 480 big bore. Anyone have any input on these big bore kits?

[Jake250ex]

Im building a 10.5:1 470, an 05. Should be strong reliable power. cheapest way to do it is re sleeve your stock cylinder and get a 96mm piston. I got my piston brand new (a wiseco) for 80 bucks shipped on ebay

[Fast470r]

may have a Cylinder Works cylinder herd good things about them see what els you can find out more about them

[DnB_racing]

Originally posted by yernkie
I am looking at an 05 450r with a 480 big bore. Anyone have any input on these big bore kits? there hit or miss... based on several Ive had im my shop, this is what Ive seen

about 25% of the cylinders within the first several hours will develop a coolant leak caused by the water jacket being thin and breaking, if you make it past 10-12 hours of operation, then you should be good and you have one of the 75% good ones,

as far as performance i see a bigger gain from stock with high compression,

but if your looking for pulling power the big bores do seam to give that extra low end grunt,
if your looking for a strong mid-range I would go high comp with a good port job and and hc2 or hrc or web cam, but its all in what your looking for

I would try to keep the compression on the low side with the big bores, to eliminate any chance of head gasket failure

[dunner250]

You will see better gains with a ported head then a bb kit. I put one on mine and a hc2 with a pipe and was still losing to a cam nodded yfz. After the money I spent on everything I was pretty disappointed. I had a my head ported and went from 47 HP to 52 HP with the same set up. So I would do in this order pipe, cam, hc piston. Porting, then bb kit. Hope this helps