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stocktires
02-05-2005, 04:50 PM
Has anyone on here put a yzf motor into an aftermarket 250r frame? I'm wondering if it could come out as good as an aftermarket frame that was built for a 4-stroke motor in the first place? It would save me alot of money
QuadRacer041
02-06-2005, 03:57 AM
ive talked to a few frame makers and they all recommend against it. the 4 stroke is much taller then the 2 stroke and i know the the crf motor sits more to the left in the frame and i dont think it would clear theupper left frame rail.plus you would have to do some rigging with the swingarm cause the motor needs the pivot bolt going through it like on the 86-87 R's but its not the same, cause like i said th emotor sits off to the left. i wouldnt waste my time because even is you make is fit, with all the frame butchering you have to do its no going to me as strong.
TampaBoy813
02-20-2005, 07:56 AM
Originally posted by stocktires
Has anyone on here put a yzf motor into an aftermarket 250r frame? I'm wondering if it could come out as good as an aftermarket frame that was built for a 4-stroke motor in the first place? It would save me alot of money it works I have a 400ex with a 2000 YZ426F motor....and am putting a 2001 YZ426F in my 250R as we speak...heres some pics of the 400ex when I was building it
TampaBoy813
02-20-2005, 07:56 AM
more
after the PC work
TampaBoy813
02-20-2005, 07:58 AM
Stock 400ex Airboot....this was a big deal when bilding this bike because the carb sits to the side....but it worked 100%
TampaBoy813
02-20-2005, 07:59 AM
from the top...
EvilJester400EX
02-20-2005, 12:15 PM
My buddy sent his frame to Rath Racing to put a CRF engine in (250r frame). Rath told him he wouldn't take on a project like that again, said it was too much work to get it made. Maybe buy a 250r geometry frame or something?
QuadRacer041
02-20-2005, 03:09 PM
Originally posted by EvilJester400EX
My buddy sent his frame to Rath Racing to put a CRF engine in (250r frame). Rath told him he wouldn't take on a project like that again, said it was too much work to get it made. Maybe buy a 250r geometry frame or something?

thats 100% right.

no offense but that 400ex isnt going to last long.
Ex_Rider43
02-20-2005, 08:46 PM
I dont know what king of abuse you guys are putting your quads to but one of our top pro bought my 400ex frame and put a CRF engine in it... it was perfect and he finished 4th in canada without any problems...
nwi45
02-20-2005, 08:59 PM
I was planning on putting some type of thumper dirt bike engine in my 250R next season..How much work is involved in getting it to fit right?
CTmxyfz
02-21-2005, 08:53 AM
Originally posted by QuadRacer041
thats 100% right.

no offense but that 400ex isnt going to last long.



J
CTmxyfz
02-21-2005, 08:54 AM
Originally posted by QuadRacer041
thats 100% right.

no offense but that 400ex isnt going to last long.



Just gotta be mean don't ya lou?:blah:





Spend the time to buy a frame already fit for 250r geometry but with a frame acceptable for a crf or yzf motor.
QuadRacer041
02-21-2005, 02:27 PM
Originally posted by CTmxyfz
Just gotta be mean don't ya lou?:blah:





Spend the time to buy a frame already fit for 250r geometry but with a frame acceptable for a crf or yzf motor.


im not being mean, i just hate to see people waste there time.
CTmxyfz
02-21-2005, 03:23 PM
I was joking man. Easy!:D
QuadRacer041
02-22-2005, 02:53 AM
Originally posted by CTmxyfz
I was joking man. Easy!:D


yo, i took the crf out on sunday for a few hours, holy cow that can move.its awsome
CTmxyfz
02-22-2005, 07:41 AM
Originally posted by QuadRacer041
yo, i took the crf out on sunday for a few hours, holy cow that can move.its awsome


Damn you man. My bike is sitting on a table with the upper motor mounts on and the bottom bolt in... Thats it. Im waiting for my rear knuckle and new swinger chain guide, and then new bearings for the front end. Give me 2-3 more weeks. Its cold working in my trailer, even more now with snow.



We are going to have to see how that crf goes against a 13:1 and ported yfz.:devil: Glad your happy though with your build! It looks great, and it seems to make you happy.
EvilJester400EX
02-22-2005, 01:53 PM
Lou's CRF will win, hands down. :blah: Nah, really it seems the CRF still has the edge over the YFZ :(
CTmxyfz
02-23-2005, 10:44 AM
Lou is heftier than me. so it might even out some. Haha, sorry lou, had to do it.;) :devil:
blue416ex
02-23-2005, 01:27 PM
ive seen a few at the track around here last summer and they still are schooling the yfzs z400s idk about the new hondas thou ??:confused:

im thinking about doing one over the summer and keeping my ex how much work is it to do ?
EvilJester400EX
02-23-2005, 01:30 PM
Originally posted by CTmxyfz
Lou is heftier than me. so it might even out some. Haha, sorry lou, had to do it.;) :devil:

Them's fightin' words. :eek:
CTmxyfz
02-23-2005, 02:12 PM
Indeed they are. I think i gotta call him out.:uhoh: :muscle: :muscle:
QuadRacer041
02-23-2005, 02:32 PM
Originally posted by CTmxyfz
Indeed they are. I think i gotta call him out.:uhoh: :muscle: :muscle:


listen rookie dont make me whoop your ***** then steal your bike too:devil:
EvilJester400EX
02-23-2005, 03:43 PM
Lou - 1
CT - 0:macho
nwi45
02-23-2005, 06:35 PM
So putting any type of thumper in a stock 250R frame is a bad idea?
EvilJester400EX
02-23-2005, 06:43 PM
Yes. The upper frame rails are too low to accept the 4 strokes. However, you can buy a 250r geometry frame that will accept a 4 stroke.
CTmxyfz
02-23-2005, 10:03 PM
Originally posted by QuadRacer041
listen rookie dont make me whoop your ***** then steal your bike too:devil:


By time you try and take my bike, yours will be loaded in the trailer with mine and we will be on our way.


Nah... its all good. Walsh riders stay together. Hey, who got you to start running razrs? Me!:blah: Remember the ol' 300 Lou? Damn POS.:mad:
QuadRacer041
02-24-2005, 03:08 AM
Originally posted by nwi45
So putting any type of thumper in a stock 250R frame is a bad idea?


i see that houser is one of your sponsors they make frames for hybrid quads, give them a call its much cheaper price wise then walsh.






justin, your a little tiny guy, i dont think you could lift my crf to put it on your trailer, lol

j/k:blah:
CTmxyfz
02-24-2005, 07:46 AM
Hey, 154 pounds and 6' .5". :D No need to lift the bike, having and enclosed trailer, ill just push it so you do not hear that damn TC pipe.:p





You still up for going to Rocky Hill this season? I think im dragging that 416 out to englishtown on the 26th or 27th of march.



I hope to have the walsh fronts and hipers on it.
hontrx265r
02-24-2005, 01:10 PM
I have a yz426 bored to a 440 in my arens 250r frame, I did all the work besides the welding, I'm in school for engineering. It came out great and my biggest cost was my carbon fiber exhaust and I only payed 250.00 for it new, a little fab work and It has been running strong for over a year. I can also remove my head and cylinder without pulling the engine ( try that one) yes you have to do some work on the swinger but the arens motor mount and headstay took very little modification. There is a post on here with pics of R's mine is the yellow one it has 400ex plastic and a carbon fiber hood, I carved that all myself also and it came out fantastic looks like it was meant for the R check it out.