With the proper mods, how high can the cc's of a Banshee/yfz 450 go? I heard of a 400 Banshee and a 470 yfz. But, what do you guys think?

 

With deep enough pockets anything is possible: a 72mm big-bore, 16mm stroke Banshee triple would be 903cc's; not very reliable or practical, but...

There are many reliable Banshees running around over 500cc's with various stroke and cylinder combinations, and some with 800-1500cc bike/sled motors. I have heard of some good running YFZ's in the 500cc neighborhood. There is more than just engine size when it comes to horsepower.

 

YFZ you can get to 500 with stroker crank and a big bore. and with a banshee I have heard of 610 cheetah motors. Big bore and stroker crank.

 

where could i go to find these strokers crank and big bores for a banshee/yfz? what do you guys think the best brand is for these performance parts? [img]i/expressions/face-icon-small-smile.gif[/img]

 

Trinity racing is now building a 912cc nitrous-injected 248 horse power cheetah tripple banshee and it looks like a bad a$$ machine. Check it out on the link below.
http://www.trinityracing.com/pages/projects3.html

Trinity racing is a good place for all your big bore stroker kit needs. I hope you have some pretty deep pockets though, this can get pretty pricey. I would really do my homework here if I were you. Make sure you learn everything you can about this kinda stuff before you go jumping into anything serious. It can get pretty technical and with alot of mods comes alot of dedication and work. Good luck.

 

The biggest twin cylinder I've heard of was (I think) a 727.Jim at JIM'S SAND TOYS had it.His shop is in Waynoka,OK.

 

Does he have a ds650 too?? If so, I raced him a while back(3 yrs ago or so).......with my 650........and won, once he ran outta nos......

 

I have never heard of Trinity motors being anything special... I would check with some of the more specialized builders like A&S, K&K, Dave Moore, White Knuckle or even some of the more independent shops. Once I was told that if a shop has to advertise, their work isn't top notch... Good work sells itself through word of mouth.

 

Biggest I've seen is a 916cc Banshee, and 523cc YFZ. It cost $2550 for the base 523cc kit, and you would then need to add on the cost of bigger valves, head porting, cams, etc. ... plan on $5K. No idea what the Banshee would cost.

DV

 

I have a very reliable 558cc Banshee[img]i/expressions/face-icon-small-wink.gif[/img]