best 250f motor

[woodsracer144]

what is the strongest and best 250f motor i would like a yamaha motor but anything will do. thanks!

[outacontrol]

got a ktm and love it!

[woodsracer144]

i've heard those are alot of work... i dont know i've never known anyone personaly that has one...

[mine]

yamaha hands down,
then honda 06 up
then zuki 06 up
and i wouldnt touch anything else.

[woodsracer144]

whats the max you can bore these to? im thinkin on the yamaha being its gonan be in a yamaha chassie. i know there is a 290 BB out there... but any thing bigger? it would be sweet to have like a 310 or somthing... any and all help is need... thanks!

[BlaineKaiser450]

i like the Honda motor most

[woodsracer144]

any one know where i could get a big bore or something...

whats a good pipe for this? i dont know bike motors very well...

my friend got a 07 yz250f and it hauls. it beats the kawis and suks, and puls the same as a crf, so honda or yami will do imo.

[woodsracer144]

could any one find how much a new 07 yx250f motor is... i dont know how to do it. thanks!

[mine]

Originally posted by coreymx58
my friend got a 07 yz250f and it hauls. it beats the kawis and suks, and puls the same as a crf, so honda or yami will do imo.

All the 250f's ( of the same year ) pull the same, torque and hp are off by a tenth if that here and there. the only way you can differ the engines are through reliability and power delivery.

[woodsracer144]

ok just a bottom end...

[woodsracer144]

ok want your input on this...
would it be smarter to but a whole motor or just buy the bottom end with a good crank and but the 290 kit for 650 on here and but the hot cams, carb, the whole valve system and head and all that ?
the 290 kit is 650'ish
http://www.rockymountainmc.com/vehicleFilter.do there you go... let me know
thanks!

[mine]

Originally posted by woodsracer144
ok want your input on this...
would it be smarter to but a whole motor or just buy the bottom end with a good crank and but the 290 kit for 650 on here and but the hot cams, carb, the whole valve system and head and all that ?
the 290 kit is 650'ish
http://www.rockymountainmc.com/vehicleFilter.do there you go... let me know
thanks!

bro, lol.

Boring out a 250f motor would lower its reliabilty level " if you will " drasticly. Why don't you just buy a 450 motor and keep it stock.

[woodsracer144]

Originally posted by mine
bro, lol.

Boring out a 250f motor would lower its reliabilty level " if you will " drasticly. Why don't you just buy a 450 motor and keep it stock.

ok to fill you in 100% this is goin in a blaster... i've had for a while and i cant sell it so im makein it to a 4-stroke and i think since its super light that if i would get some aftermarket shocks in it and stuff i would ahve a fast bike....

i know the 250f motor in the bike is fast and i dont think the blaster chassie is to much more weight...

[woodsracer144]

the jug that i would get is sleeved and all that for the 290CC im not boreing anything on the motor, its like bolting a 310CC on a 250r or a 480 on a 450r... its just a bold up top end...

[woodsracer144]

ok i was crunchin on some numbers...

the frame i have.
a-arms-400
motor-1550 ( the bottom end then the top and all that being bought in pieces)
swinger-300
axle-150
brakes-400(hydro blaster brakes front and rear.)
shocks-400( fronts only)
stem-150
equals.... 3395

now im think i can sell some stuff..
brakes- at least 175 for all mine.
a-arms-60
exhaust-35?
shocks-20 for all
axle- 50
motor- 600
carb-75-100
wirein-50??
that is 1080.
and the differance is 2315...
im spendin 2315 on all the aftermarkets and then i still have tires and rims to go and a exhaust... im gonna be over 2700 on this build... and i can have a pimped 250r for 3000... mabie i will do it as a side project or build it and not thro on al lthe a-arms and stuff on it...

whats your input?

[mine]

You could probably buy 2 blasters with all that money your putting into that thing. Take that cash and buy and buy a used 400ex or even better, find a used 250f and take the motor out of that. Then sell the roller for another $1500. I've ridden a fast *** blaster one time dude, it was a 240 and it has some super formula in that engine im tellin you. It would honestly flip me whenever i touched the throttle. It seems your wasting your money but different strokes for different folks. Just look around for some good deals and bargain with people. i just picked up a fresh 2005 yz 250 for 2 grand even.

[jesseweaver]

its your call but... id go with the 250f/blaster hybrid. that thing would rip.

[ZeroLogic]

Not worth it. Buy something more up to date. Your looking at a lot and I mean a lot of work.:chinese:

[QuadJunkies]

Ive got some pics of a kid who races a fully build 250f in the WORCS series.. This quad is SAWEET!!
Ill have to go and find it .

[mine]

Originally posted by QuadJunkies
Ive got some pics of a kid who races a fully build 250f in the WORCS series.. This quad is SAWEET!!
Ill have to go and find it .

IN a blaster frame ?

[QuadJunkies]

Originally posted by mine
IN a blaster frame ?

No, Im not sure on the frame, but I think its Laeger or A JB. Not for certain.
http://www.pbase.com/quadjunkies/image/84478904.jpg

[woodsracer144]

Originally posted by QuadJunkies
No, Im not sure on the frame, but I think its Laeger or A JB. Not for certain.
http://www.pbase.com/quadjunkies/image/84478904.jpg

it looks like a 250r chassie...


i just thought its something its never been done to me... i know the CT 240 kit is a fast motor, i just figuered since people are goin to 4-strokes i could build on and see how it does. i have the ablity to get to just about all the tools that i would need. i have a MIG welder that i can use and im buyin a TIG welder...
i have a cuttin tourch, grinders plasma.. and i have a buddys gramp that can get me all the metal i would need. i have a mill and a lathe also...

i did some math the other night and as i said it would cost me 3395 with just about all the aftermarkets you can put on it...


i would have to find out what the CC's are for the atv's in the 250 class...
any one know the age groupes and CC's for the 250's....

i think that this would be a very nice ride if i would take my time and do it right...

i think i would kinda coppy the 250r frame rail spots and stuff i have a shop teacher that is really smart with all this ... it was in a race team for years...
thanks for all the help...