Big Bore Kit for XR600

3 replies to this topic
  • tuts

Posted March 10, 2002 - 11:35 PM


i have heard several things....
what exactky does 628? big bore kit entail?

  • Matt96xr6

Posted March 11, 2002 - 06:04 AM


YOu will need to bore the cylinder, install the sleeve and piston. The HRC usually comes with a cam and new jets.

It is cheaper to go to a 660 kit these days. About 1/3 the price of the HRC 628 kit


[ March 12, 2002: Message edited by: Matt96xr6 ]

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  • ossagp1

Posted March 11, 2002 - 10:48 PM


WOW,,Idon't know where matt is getting his pistons, but I need to know!!

Anyway, I was thinking if I ever did it again, instead of using a sleeve I would send it off to either RPM or Ericgorr and get them to bore and replate instead of sleeve. the plating works so good on stock and two stroke big bores i would like to try it on a 4stroke.

In short you will need a manual and probably take your engine out of the frame. It isnt that hard really.

  • Victor_Venturo

Posted March 17, 2002 - 06:37 PM


The real 628 kit that was used for racing was very expensive. The big boost came from high compression piston and bigger cam and taller gearing that was all part of the kit from Honda raceing. It was hard to start but very fast.
A lower compression bigger bore setup for pump gas and easy starting might be better for a play fun bike. If your cams are good then a new pistin and rings will make a lot more power on an older engine for under $200.

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