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Posted

if these are the kits that you put a new sleave into you banshee cylinders then all you are doing is makeing your already small transfers even smaller.

 

You will see better performance from the 400cc aftermarket cylinders than from banshee cylinder with 420cc sleave

Posted

Ive got the 420 big bore done and there was a big power increase. But at the same time I got it ported and a new head with smaller domes so I don't know how much of the increase was due to the bigger bores. I am very happy with it though. I started with T5 pipes it had all kinds of mid range, I could pick the tires up in every gear like a four stroke, and it was way more forgiving for hill climbing. If your rpm's dropped a little it would keep pulling where before I would have died out. I then changed to Cpi pipes and have much more top end but still way more mid than it had before the 420. I would recomend the 420 if you want more power and you are on a budget as it is about the cheapest way to go, but I have been told the strokers will make more power, however they are a lot more money as well.

 

Hope that helps

Posted

I was looking around and i found a 400cc/68mm cylinder kit from rossier engineering. The kit comes with new power valve cylinders, head, pistons, rings, pins, yz250 reed cages w/ v-force reeds. The kit doesn't look too bad. Little on the expensive side-2500 dollors. Thank god for tax returns. does anybody know anything about this kit or anybody that has it.

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