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woodsracer144
03-03-2009, 08:08 PM
what is the best 250L motor... a buddy had a killer 05 yz250
how are hte rms? would these put out more then a trx250r? or would they be the same...
BlackRaptor
03-05-2009, 11:07 AM
best thing to do would be get some older issues of Motorcross action or dirtrider and read the reviews of the bikes and find one with characteristics you like. I think you should consider a KTM250exc engine it would one of a kind and would totally rip. KTM knows 2-strokes
g9901920
03-05-2009, 02:07 PM
They do put out more power than a stock to stock trx engine.

but the problem is they dont have a counter balancer.
all quad motors have them.
they will vibrate the crap out of you.
woodsracer144
03-05-2009, 06:05 PM
i just thought itwould be cool to use a yfz chassis and throw a yz250 in it...
usp4u
03-06-2009, 01:02 PM
as noted above lack of a counter balancer is the killer. if you were to do it though, I would look for a wide ratio motor such as a WR250 or KTM 250xc-w or exc. The motors make longer power than MX spec motors, dont have have such a hard "hit" and wide gear ratios if this were to be a trail quad.
jcs003
03-07-2009, 12:54 PM
trx250r... besides this i heard KTM is coming out with a fuel injected 2-stroke.
woodsracer144
03-08-2009, 10:30 AM
how the hell would a FI 2 stroke work? i think that is stupid
jcs003
03-08-2009, 10:39 AM
Originally posted by woodsracer144
how the hell would a FI 2 stroke work? i think that is stupid

it worked in snowmobiles, why not ATVs.
woodsracer144
03-08-2009, 11:54 AM
i didnt think it would work that well... i totally forgot about artic cats EFI system... i just like my carbs...

KTM is makin a 250 2 stroke quad?
jcs003
03-08-2009, 03:02 PM
Originally posted by woodsracer144
i didnt think it would work that well... i totally forgot about artic cats EFI system... i just like my carbs...

also the use the EFI on outboard motors too.

KTM is makin a 250 2 stroke quad?

no it is a twostroke bike. KTM250SX i believe.
NED441SUZ
03-09-2009, 08:37 PM
I'd say a 92-01 CR250 engine is the best. Real powerhouses. Service Honda figured out how to mount them in 400EX frames in a way that cancelled out most of the vibration.
jcs003
03-09-2009, 08:39 PM
Originally posted by NED441SUZ
I'd say a 92-01 CR250 engine is the best. Real powerhouses. Service Honda figured out how to mount them in 400EX frames in a way that cancelled out most of the vibration.

do you know the output of those years?
NED441SUZ
03-09-2009, 08:56 PM
Not sure of exact #'s but more power and less weight than any stock 450F. Honda guys seem to like 95-96 the best.
woodsracer144
03-09-2009, 09:08 PM
didnt FTZ put that cyl on the TRX?
NED441SUZ
03-10-2009, 07:03 PM
That was the 86-91 style with the power valves removed. Not sure what they had inside, but there were custom block of plates where the power valve stuff was.
rustyATV
03-11-2009, 06:16 PM
The Rotax 257GSi that came in ATK 260LQ bikes was supposed to be a real runner, and it's counter balanced, too!

http://www.mustangmods.com/ims/u/477/10593/192205.jpg

You'll just have to put the chain on the other side.


Originally posted by jcs003
it worked in snowmobiles, why not ATVs.

It also worked in Evinrude's outboards, and they're even cleaner than equivalent four strokes.
jcs003
03-11-2009, 06:52 PM
Originally posted by rustyATV
The Rotax 257GSi that came in ATK 260LQ bikes was supposed to be a real runner, and it's counter balanced, too!

http://www.mustangmods.com/ims/u/477/10593/192205.jpg

You'll just have to put the chain on the other side.




It also worked in Evinrude's outboards, and they're even cleaner than equivalent four strokes.

yes, i seen that too. puting out alot of power too.

this looks pretty impressive.
http://atv.off-road.com/atv/article/articleDetail.jsp?id=190534
woodsracer144
03-11-2009, 07:02 PM
did they make a quad with that in for like 15 K in the 90's? i think i read about it some where
jcs003
03-11-2009, 07:05 PM
Originally posted by woodsracer144
did they make a quad with that in for like 15 K in the 90's? i think i read about it some where

this looks pretty impressive.
http://atv.off-road.com/atv/article...l.jsp?id=190534
woodsracer144
03-11-2009, 07:06 PM
that didnt work...
jcs003
03-11-2009, 07:09 PM
http://atv.off-road.com/atv/article/articleDetail.jsp?id=190534
woodsracer144
03-11-2009, 07:15 PM
yep thats the one!
rustyATV
03-11-2009, 09:02 PM
Originally posted by woodsracer144
did they make a quad with that in for like 15 K in the 90's? i think i read about it some where

There were actually a couple of quads; the Rebel/Star 250 you see in the links, and the Phillips/Rotax Superquad that was sold here and there abroad.

I don't know what, if anything, is different between the engines used in the quads and those used in the ATK bikes