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sycoracer911
06-05-2004, 03:55 PM
hello i hear of a lot of people doing this conversion...( cr 500r motor in a 250r frame)... well ne way id this hard to do. does it fit ok... i understand im going to have to make an airbox for this but the pipe should fit. well did ne one do this? is it worth it? is it hard? thank you

310Rduner
06-05-2004, 04:40 PM
Just buy a 500 cylinder for the R. Don't have the link, but there is a company with a 500 cc jug (its actually 4 something, but it strokes to 505).

jst
06-05-2004, 08:03 PM
Trinity has the cylinder you are looking for.I held it in my hands at the dealer show this year.

sycoracer911
06-05-2004, 09:54 PM
yeah patriot racing makes a cylinder over 500cc its supose to compete with the cheeter ktis for shee's. but that is a lot of money as i can get a cr 500 motor for under 1g... do u guys no of ne other conversion's you can do to the r... would a yz 426 go nice in the 250r frame?

wilkin250r
06-07-2004, 12:02 PM
That CR500 motor vibrates somethin' fierce.

RuffRyder
06-09-2004, 10:34 AM
Originally posted by wilkin250r
That CR500 motor vibrates somethin' fierce.

No counterbalance in those motors...so if you can hold on until your teeth rattle out, its one wicked ride. :macho

86atc250r
06-09-2004, 11:15 AM
If done correctly the vibration is not too bad. It's there, but manageable.

This is not a simple "drop in" project. If you decide to tackle this, be prepared for some work and some problem solving.

jethro
06-10-2004, 05:43 PM
the 500 cc cylinder is made by this place http://www.cpindinc.com/ not patriot racing this is the company that desighned the cheetah cylinders the cylinder made 80 hp bolt on with the crank the torque curve looked like a huge *** 4 stroke was nice and flat at 50 and held it there from 7,000 to 9,000 verry good :D

PEPwalshZ440
06-11-2004, 03:21 PM
yea dude screw the CR500 motor....get a CRF450 motor and hang on:macho

TCracin440ex
06-12-2004, 01:44 AM
a buddy of mine did this conversion put a 500r motor in a 250r stock frame...and every frame he bolted that motor to broke...too much vibration...so he bought a 86 model frame and put his stock R motor back in...i wouldnt even want to take the risk of ridding something thats going to be like ridding a big giant vibrator...when he did it...he didnt do any kind of mods to the frame...macracing.com did a cr500 topend on a 250r bottom and it seemed to me like it was pretty good...now htat 1 id want to ride...i watched a video of it and she had a plus 10 swinger on it and the frontend was still lifting off the ground about a foot and a half

TCracin440ex
06-12-2004, 01:46 AM
http://www.atvsource.com/articles/product_reviews/2002/011602_mac_racing.htm



here is some info on the trx500r

nacs400ex
06-17-2004, 07:46 PM
Originally posted by PEPwalshZ440
yea dude screw the CR500 motor....get a CRF450 motor and hang on:macho

HAHAHAH YA RIGHT, You seriously think a crf450 pulls harder than a cr500?:eek2:

XCredrider
06-28-2004, 04:45 AM
my uncl has a KX500 and that is still in the bike. When you sit on it whn it is idaling it blurs your vision cause of the vibbrations. It absolutely rips like nothing else though.

slick250
06-29-2004, 09:59 PM
Originally posted by nacs400ex
HAHAHAH YA RIGHT, You seriously think a crf450 pulls harder than a cr500?:eek2:
Thats just what I was thinking too. I'd rather have a 310 or 330 kit than a crf450. Just me though.;)

baseballplaya23
04-20-2005, 01:09 PM
i have a buddy that wants to do this conversion just because he wants to try to beat me and my cousin. he does not have any race experience. what is everyones opinion on this conversion. my cousin rides a 04 yfz and i got a 86 250r.

wilkin250r
04-20-2005, 02:29 PM
I'll admit, I've never done it, but I personally think the CR500 conversion is just plain dumb.

I once had a motor with with lots of power, and ungodly vibration. It was fast, no doubt, but an absolute nightmare to ride for extended periods of time, and an even worse nightmare to maintain. Sure, the power was fun. In the beginning, it was worth every bit of vibration. Like any new toy, however, the thrill wore off, but the vibration was still there. I would imagine the CR500 would be much the same.

The vibration is tolerable for short, quick rides, like drag-racing. But while the CR500 is fast and powerful, it doesn't compare to the tricked-out 100HP banshees. If drag racing is your thing, there are MUCH better motors out there.

So, all in all, if you can't ride for extended periods of time it makes a horrible machine for anything but drag racing, and will never be King of the drag strip, so why bother? I've never met anybody that was wholly satisfied with their CR500 conversion. Of those I have talked to that HAVE done the conversion, not a single person would ever do another, or recommend it to anybody.

Now, if the motor was counterbalanced, that would be another story. It would make a terrific duner...

zedicus00
04-20-2005, 02:29 PM
http://www.saberracing.com/

i believe if you want anything that that would be it. near bolt on kit. 500cc.

baseballplaya23
04-20-2005, 04:27 PM
yea me and my cousin both decided that if he really goes thru with this that we will both just punt his *** to the wall show him whats up. haha

Mechanix311
04-20-2005, 06:13 PM
I have done two of these and i wont do another again. No doubt it is extremely fast and i did indeed do pretty well on the drag strip, the vibration was too much to handle. I tried lots of different mounting poly, rubber, etc and could never find a good way to reduce vibration. Do not use a 250r pipe, big mistake have a out of frame drag pipe built.

machwon
04-20-2005, 07:47 PM
zedicus00 is right on a place to get the near bolt on kit. They are cast by CP Industries but they only sell them to a select few. It will use your stock counter balancer, so vibes are still ok. Sabertooth has probably now cracked a 100 rear wheel HP by now which give alot of shee''s problems. Trick racing put a turbo kit on one and got over 150 at the rear wheels. Definitely, look out most banshee's!

250-R-250
04-20-2005, 07:50 PM
The SaberKit Looks AWSOME.....Anyone have a price on what one would cost to pick one of those kits up?

machwon
04-20-2005, 07:54 PM
I'm not sure on Saber's price, but I think Trick's price is in the 4 grand range without a turbo. Keeping in mind they include a crank, head, cylinder, piston kit, pipe and carb too I think.

wilkin250r
04-20-2005, 08:21 PM
You need to realize that any kit that will triple your horsepower is going to be extensive. You're not going to get 100hp with a simple $400 bolt-on modification.

With any such modification, you can't just add a huge displacement without other modifications, like carb, pipe, and peripherals. Plus, the addition of a complete new crank. Extensive modifications and upgrades aren't cheap, so any "package" deal is going to be expensive.

zedicus00
04-21-2005, 09:20 AM
really its not horribly expensive considering what you get. like i said. new cdi new carb new complete topend and piston. new crank, new pipe, gaskets, head plus the porting work. a pro-x "kit" is over $1000 for just a new topend.

Eddiesanders250
04-21-2005, 10:39 AM
ya i emailed him and he said for all the parts neccessary it would cost 2600. thats including the cylinder rod piston

wilkin250r
04-21-2005, 11:35 AM
So the $2600 is the basic package? Cylinder, crank, piston, head, reed cage.

I wonder how much the deluxe package runs, complete with carb, pipe, and ignition.

They also sell a lock-up clutch, that baby is probably expensive. Last time I looked up lock-up clutch kits, they ran about $800

zedicus00
04-21-2005, 02:35 PM
o yeah the complet kit comes with the lockup clutch too. and dont forget ported for however you want it. its 4200$

Eddiesanders250
04-21-2005, 04:15 PM
ya thats what it was called. the basic package is 2600. i asked him how reliable it was he said hes had no problems yet and thinks it is fairly reliable. but if you get that package its basically for dragging.