Thumper Club Forum

Technical => Bike Problems/Questions => Topic started by: tommy on July 28, 2009, 10:29:14 PM

Title: big bore xbr
Post by: tommy on July 28, 2009, 10:29:14 PM

hi guys i just got me hands on a 650 dominator for my xbr  and it needs a rebore its not a bad bore but could do with a freshen up ok so i rings nornman hyde and they can do a 680 kit for a xr 650 they dont have a listing for a dominator so has annyone fitted this kit to a nx650 ...............i had a look a that xbr 666 link but i dont speak ze german so i dont understand it  thanks guys   yoshi

Title: Re: big bore xbr
Post by: SteveC#222 on July 29, 2009, 04:56:31 PM

This guy used as 670cc convertion using a ceramic coated piston - may be something similar?

http://lovik.tripod.com/Clubman6-schottmeier.html (http://lovik.tripod.com/Clubman6-schottmeier.html)

http://lovik.tripod.com/Clubman7-schottmeier.html (http://lovik.tripod.com/Clubman7-schottmeier.html)

Title: Re: big bore xbr
Post by: turkeyuk on July 29, 2009, 09:20:33 PM

The XR is 80mm stroke & the dommie is 82mm so i dont think it will work.

I have a Venolia 101mm (654cc) high comp forged piston in mine which gives 11:1 compression ratio on a standard dommie head.

heres some interesting reading for tuning rfvc engines.

http://www.thumperpage.com/articles/gb-500faq.html

Title: Re: big bore xbr
Post by: tommy on July 30, 2009, 11:58:06 PM

thanks guys for the help ............................turkeyuk is that 80mm stroke for a xr 600?where did you get your piston kit regards yoshi ..............tigercraft xbr   mmmmmmmmmmmmmmmm; lovely any photos?

Title: Re: big bore xbr
Post by: turkeyuk on July 31, 2009, 11:12:46 AM

Hi Yoshi, yes 80mm for the XR,

My piston came with my Tigcraft racer as a spare, i have an invoice from Race techniques who supplied it:

http://www.racetechniques.com/

Or Venolia themselves should be able to supply it or let you know who is your nearest distributor.

http://www.venolia.com/

I dont have any pics of the Tigcraft at the moment as it is in pieces.

It is basically the same as this:

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Title: Re: big bore xbr
Post by: tommy on July 31, 2009, 10:19:31 PM

thanks turkeyuk thats a big help  ..................yoshi