Thread: XT660 Tuning and durability
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  # 7  
Old 06-06-16, 10:16
Brutank Brutank is offline
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Join Date: Oct 2015
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Quote:
Originally Posted by Kev View Post
Been there done that, any engine performance modification will affect the long term reliability of a motor. The cylinder is to thin at 104mm & you may brake the cylinder skirt off with a 104mm.

Bore the casing & go as big as you want right up to 108mm.

A 105.5 bore with +2mm valves, 5050 cam stage 3 air filter will see around 76 rear wheel HP.

You can never compare the XT to a 690 KTM they are two different bikes, I am yet to see an XT anywhere the same weight of the KTM, we know we have the capability's of getting these motors up 125 rear HP as done on the 700 Raptors .
Hello, I was looking at Boring my engine out in a few months as I have acquired a house with a garage. you say the Cylinder is too thing at 104mm, but then talk about a 105.5mm bore ? is 104mm their safe "limit" ?

As I would love to go around 105mm

Kind regards - Brutank