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View Full Version : TRX250R into TRX500R?


smoxy
08-21-2005, 09:19 PM
Has anyone ever mated the bottom end of a 250R counterbalanced motor with a CR500 jug? I don't see why this couldn't be done with a lot of machining and possibly some spacing. This would have been awsome if Honda had of done this at the time of the Quadzilla!
Fred55
08-21-2005, 09:20 PM
i think most ppl put on scrambler 400 heads, i guess the holes are within millimeters of lining up.
TheFontMaster
08-21-2005, 09:24 PM
It's been done before. A couple years ago in dirtwheels there was an atc500r that I belive had a cr500 cylinder on it.
cdrookie
08-22-2005, 02:52 AM
that thing had the whole cr engine if i remember right.

it'd take alot of machining to get the 500 jug to work with a 250 bottom. too much work. the stroke is way different and the 500 piston isn't what the 250R's counterbalancer was designed for.
zedicus00
08-22-2005, 07:07 AM
its been done. theres a review of one on the net sumwhere... had to weld up all the stud holes in the cases and make new ones. i think a new rod had to be used too...
smoxy
08-22-2005, 07:22 AM
Do you know where this article is on the net? Thanks!
wilkin250r
08-22-2005, 11:00 AM
If it's a 500cc engine you want, check into www.saberracing.com

Huge bore, huge horsepower. I would venture to say it would be better than a CR500 top end.
JDiablo
08-22-2005, 11:27 AM
Originally posted by wilkin250r
If it's a 500cc engine you want, check into www.saberracing.com

Huge bore, huge horsepower. I would venture to say it would be better than a CR500 top end.

OMG that is destruction in every way,shape,and form!!!!!
08-22-2005, 01:17 PM
I wear this shirt :)

http://www.island-designs.com/pictures/4stroke_shirt.gif
zedicus00
08-22-2005, 02:14 PM
http://www.atvsource.com/articles/product_reviews/2002/011602_mac_racing.htm

and

http://www.atvsource.com/articles/product_reviews/2001/112601_mpracing_polanda_engine.htm

sumone already mentioned saberracing

and pro-x jugs which top out at 400cc bored an stroked

dont forget the pilot jug hybrids which get close to 500cc's and r more reliable then the polondas

and PSI does there own thing entirely

good luck
smoxy
08-22-2005, 10:41 PM
Thanks for the articles and links guys. This is great stuff!
09-02-2005, 11:13 PM
check out ftzracing.com they have some killer set up like that