how to get 75hp

aloha450x · Post by **aloha450x** » January 22nd, 2009, 12:22 pm

I called and talked to dean is It? anyway 6k is some serious coin. yeah it would be badass but I don't think the trx motor mounts are the same a the cr500. if they were then maybe and that's a big maybe. so if it dosent you have to find a roller, trx botom end, mod the frame, drop 6k on the kit. by the time you are done you looking at 8k. imagine a 100hp 70lbs of torque street legal supermoto. haha that fucking nutz, but so is the grand total.

Post by **AlisoBob** » January 22nd, 2009, 12:26 pm

aloha450x wrote:by the time you are done you looking at 8k. ...fucking nutz, but so is the grand total.

I know a guy who spent more than that.... didnt even get a brake pedal.

dannygraves · Post by **dannygraves** » January 22nd, 2009, 1:00 pm

AlisoBob wrote:
aloha450x wrote:by the time you are done you looking at 8k. ...fucking nutz, but so is the grand total.
I know a guy who spent more than that.... didnt even get a brake pedal.

ouch!

dannygraves · Post by **dannygraves** » January 22nd, 2009, 1:01 pm

aloha450x wrote:I called and talked to dean is It? anyway 6k is some serious coin. yeah it would be badass but I don't think the trx motor mounts are the same a the cr500. if they were then maybe and that's a big maybe. so if it dosent you have to find a roller, trx botom end, mod the frame, drop 6k on the kit. by the time you are done you looking at 8k. imagine a 100hp 70lbs of torque street legal supermoto. haha that fucking nutz, but so is the grand total.

the atc250r botomend also works w/ that jug and has all the benefits of the TRX motor, but I'd bet it would fit in a bike chassis better.

aloha450x · Post by **aloha450x** » January 22nd, 2009, 1:29 pm

what ar the oodds of the mounts being the same? excluding the swingarm and head?

dannygraves · Post by **dannygraves** » January 22nd, 2009, 1:37 pm

I'm pretty sure they are not the same. but the idea was to build an a/f specifically for the 250r motor.

aloha450x · Post by **aloha450x** » January 22nd, 2009, 1:52 pm

who's gonna do it??? that would be fucking nasty!!!! what frame would be best? what is the most ridiged frame?

100hp honda · Post by **100hp honda** » January 22nd, 2009, 4:04 pm

saber MIGHT fit on old style cr250 bottom, which would fit in AF no problem

. if you use my idea dont be taking credit for thinking it up

pstoffers · Post by **pstoffers** » January 22nd, 2009, 5:22 pm

100hp honda wrote:saber MIGHT fit on old style cr250 bottom, which would fit in AF no problem .

aloha450x · Post by **aloha450x** » January 22nd, 2009, 8:57 pm

will it fit????? also how many gears does the older cr250 trans have and what are the ratios? and what year cr250? 98? and up or older?

100hp honda · Post by **100hp honda** » January 22nd, 2009, 9:26 pm

you be the judge

cr250

trx250

aloha450x · Post by **aloha450x** » January 22nd, 2009, 10:30 pm

what year cr motor is that? does it use the same crank? looks like she might go. so are you gonna do it or are you gonna make me do it

iggys-amsoil · Post by **iggys-amsoil** » January 22nd, 2009, 11:25 pm

First I would look at the 85-86 ATC motor, same counter balancer and 6 speed. The mounts maybe closer than a newer TRX.
Then check the tranny gear ratios. What are the ATC 5th and 6th verses the CR 4th and 5th.

Would the trany be worth it at that point? Would the 6 speed make a AF more 125 like in shifting

One thing I do know is hitting 6th on that ATC and your flat out moving. Hope you know how to turn that thing.

CR480R · Post by **CR480R** » January 23rd, 2009, 2:40 am

Atc's and trx's use same cases... but I believe cylinders interchange with 1985 CR250... the crank may be a different story

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » January 23rd, 2009, 6:24 am

Frank, the transmission shafts are the same diamiter as the 500's, they use the same thrustwashers and clips. The gears are different part #'s which makes me think the shafts must be arranged tighter together than a 500's but achieve the same ratios 1984-07 as the 1988-92 close ratio 500 trans like you have.

Post by **AlisoBob** » January 23rd, 2009, 6:39 am

I wish I had a old jug laying around, to poke some holes in like this.... and see if I struck water....

Especially on the exhaust side...

aloha450x · Post by **aloha450x** » January 23rd, 2009, 7:49 am

thanks adam!!! so now questions we have left. will it fit on a cr250 motor? and if so does the early model cr250 motors have the samemounts as say a 98. if it won't fit does the trx or atc have the same mounts as the cr250. doubt it but worth asking. if it does bolt on the cr250 will the trx crank fit in the cr250. if not then ya just need to swap rod with the saber rod. im sure I missed a few things. oh yeah where to get a spare 6k

aloha450x · Post by **aloha450x** » January 23rd, 2009, 8:39 am

just talked to neal.....nothing in the works for a cr500. second the saber cylinder won't fit he dosent think nobody has tried. plus the cr250 dosent have a counter ballencer. and the trx/atc bottom end does not share the front and lower mounts as a early cr250. so now we need measurements for a trx250 motor with a saber cylinder to see if it will fit.

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » January 23rd, 2009, 8:50 am

I'm not sure how that all works, but you'll have to add some serious volume to the crankcase so it has enough to reach pressure in the cyl.

aloha450x · Post by **aloha450x** » January 23rd, 2009, 11:20 am

well I do know these guys are jackings trans in sand I didn't think about on pavement where you get constant hookup. trans wouldn't last a week. you can have all the hp in the world if you can't get it to the ground its useless.

teemtrubble · Post by **teemtrubble** » January 23rd, 2009, 11:29 am

aloha450x wrote:well I do know these guys are jackings trans in sand I didn't think about on pavement where you get constant hookup. trans wouldn't last a week. you can have all the hp in the world if you can't get it to the ground its useless.

I didn't think you ever figure that out

100hp honda · Post by **100hp honda** » January 23rd, 2009, 4:56 pm

knowing how honda used the same platform for alot of thier stuff, i assumed the early cr250/250r probly had the same stud pattern, and from looking at the photos they looked the same to me. but i talked to a guy today about this subject and i guess the studs arent the same but i dont know. problem with this whole subject is we are at the mercy of 'hear say' because no one has both crankcases right in front of them to give a concrete answer.

Ported&Polished · Post by **Ported&Polished** » January 23rd, 2009, 5:56 pm

I hate to say it but Freemer would know the answer. He has been running a big bore cylinder on a trx250 engine for more than a decade. I can tell you for certain that his trx 350 hauls ass and the bottom end has been rock solid. His buddy Allen Knowles designed the first big bore jug for the trx, and makes a power valve versions as well as a 370 kit for it.

100hp honda · Post by **100hp honda** » January 24th, 2009, 9:18 am

after giving it more thought and making few phone calls it may work with the right combo of parts

CR480R · Post by **CR480R** » January 25th, 2009, 3:07 pm

100hp honda wrote:knowing how honda used the same platform for alot of thier stuff, i assumed the early cr250/250r probly had the same stud pattern, and from looking at the photos they looked the same to me. but i talked to a guy today about this subject and i guess the studs arent the same but i dont know. problem with this whole subject is we are at the mercy of 'hear say' because no one has both crankcases right in front of them to give a concrete answer.

1985 CR250 cylinders bolt onto atc/trx bottom ends..

http://www.3wheelerworldforums.com/show ... light=atac

BannedCR500Riders.com

how to get 75hp