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buzzy613
06-20-2011, 10:53 PM
would i beable to bolt up a crf 250r in to an 85 to 85 atc frame? i think that would be a fun build buthow hard would it really be to do a full heart trasnplant

audioworks04
06-22-2011, 09:10 AM
No, it is far from a bolt in. This has been done a few times, if you look through some older builds you will see the issues others have had.

buzzy613
06-23-2011, 06:18 PM
alright thanks

buzzy613
06-24-2011, 09:08 AM
ok i thought it over and ill keep the two stroke but insted of the honda 250r, i was thinking the powervalve motor from a 88-91 lt250r motor. any body dissagree?

three_wheelin45
06-24-2011, 03:27 PM
.... why not put a newer cr250r power valve head on it??

buzzy613
06-25-2011, 04:58 PM
the cr250r has a power valve? well ill just keep the motor and do that. i know a guy that has 6 atc 250r all parted out now i just go to save up my moneys thanx a bunch guys

audioworks04
06-26-2011, 07:38 PM
I have no idea why you would want to use an lt motor, and you would need alot more than just a head from a pv cr motor. You would need the full cylinder and alot of mods to your cases just to run a pv top end on stock atc cases. Not trying to be a dream killer, just realistic. I would say do some research and find out what you want. You can do alot with a stock cylinder and the right port work.

buzzy613
06-27-2011, 08:55 PM
alright cool i"ll think over it a little till i get the money saved up

torker
08-10-2011, 12:45 AM
The power of the newer 250f's will amaze you.

TORKER.

Dirtcrasher
08-10-2011, 06:25 AM
^ As well as how often the 250F needs motor work.

HuffieVA
08-10-2011, 07:36 AM
If you have a blank check, go ahead and put a modern four stroke in it, after all if you run them like you designed they only cost you around $100 an hour to keep them in top running condition... Overall dirt bike sales are down nearly 60% over the past few years and the only ones selling more bikes than they can make/import are the companies still producing two strokes (Husqvarna, KTM, GasGas etc) the tide is slowly changing once again, the only thing holding back a major two stroke resurgence is the unfair advantage the thumpers are given at the pro level. I have nothing against four strokes in general but they are not (in small displacement) a natural born race motor, and in order to make them fast they greatly sacrifice reliability. If you simply want to trail ride I don't see a problem with them but if you want to be competitive in a race environment either open your wallet or but a two stroke because cc per cc even a 20 year old smoker with a good rider can smoke a thumper (at a tenth the operating cost)

250rRoostmaster
08-13-2011, 07:19 PM
Very true Huff!!!

three_wheelin45
08-13-2011, 09:09 PM
I agree with huffy 2smokers are more race material then a 4poke imo... I dont really like 2 strokes, But i will admit there fun as hell to ride!! I love riding my friends 250r and just roostin it... whew!!! and when you get off that sum beach your eyes are watering its just like YAMAHONDAMAN

audioworks04
08-14-2011, 11:06 AM
A new 450 is alot like a two stroke, in that it revs to the moon, but it has power everywhere. They really are not that much of a money pit aslong as you take care of it. Jet it right one and change the oil every 2.5 hours of ride time, I run rotella T 15w-40 and a stainless steel oil filter. I do valve checks every 10hrs of ride time and adjust as needed. I have over 50hrs on my 450 and have not done more than valve adjustments to it. In my book thats pretty good. Dont get me wrong I wouldnt get ride of my smoker, I love it equally as much and still have a blast on it.

Dirtcrasher
08-14-2011, 12:54 PM
Nothing so bad about the 450, but the Honda 250 is a maintenance nightmare..... I wish the guys like NINJA who service them could explain to (edit -this thread) as well as he did to me......

I've said it before, when and if I build a 250F, it will be a Yamaha engine in an 86 200X or 250R chassis. I have all the 86 200X parts to make a roller, so that would be easiest..............

torker
08-14-2011, 10:14 PM
Agreed, 4 stroke 250's are very powerful, but very expensive and demand lots of atention.
Yamaha's seems to be the most reliable. Seems that way.

TORKER.