has anyone put(or seen) a newer RM250 motor('93-'94) in a suzuki LT250r chassis? (pref '91-'92)
how did it fare(last)?
what mods are needed?


i know that i've heard of hondas w/ similar swaps, but what about a 'zuk?

i'm just thinking of a crazy project (that may never happen,) but since none of the mfg's want to build it for me... i might just do it myself.

 

Why would you want to replace one boat anchor with another? HAve you looked into the briggs and straton. Ive heard that you can really milk the horsepower out of those. If you put in the briggs motor it would be a large step up from what you have but still miles away from a real motor the trx250r. 1s + 2s = still equals junk s=suzuki. The first step to being a good rider is you first have to learn how to ride. There is no reason why you need to do this because you first have to learn how to ride.i bet this thing would fall apart more often than a stock suzuki (i have a hard time imagining that though).

it is all in good fun

 

*yawn!!!*

your jealousy shines through clear as day.
you just can't stand getting beat by me, huh?
i keep doing it & you just keep whining with all your honda pride.... can't stand getting beat... why don't you just shut that trap of yours?.... 'cause if i build it, you'll eat those words *again*, and i know it!

i can see you're not daring enough to try something as radical... you just stick to what the crowd says to... that's right! stay in your box! good boy rover! good boy!

DO I KNOW YOU?? i'm personally sick of your attacks on a legitimate technical question.

 

Dual,
I dont know if it would work or not, but go for it! I am looking for a suitable street bike motor for my 85 QR as we speak...

RoostkIng...

 

i'm debating building it frame-up, (i'm not that far from it.... considering all the mods i've already started putting on & plan to do anyways....) just take of the aftermarket stuff, bolt it on the new frame & swingarm(laegers???), get the misc parts that i need( some new, some used.. i already have some)... and viola! new machine!! i'll just be patient with ebay & the classifieds, i dont have to do it all at once.

getting a title may be the difficult part, but as long as i have all reciepts, i should be fine.

i think i'll just bolt all my stock stuff back onto my current quad & sell it to my brother or a bud...(after i get this one built)

the only difficult parts may be the pipe (may need to have a custon one made), sprocket location(which should be close), dimensions at the swingarm pivot, and motor mounts.... the rest should be no sweat

 

What planet are you on? Maybe you should hop down from cloud 9. Getting beat by you. Dont make me laugh. But i think i know what your problem is, they call it zuk fever. This is where a person is tricked into believing that they are going fast but they really are not. I know how you could think that though, becvause the bike is shaking so much you could barely hold on and the engine is making a horrendous sound and you are getting bumped all over the place. But do not worry there is a cure for this disease. first you have to ride with a trx250r and when they have to stop and shut off their engine to wait for you maybe you will start to realize how much superior they are to the suzuki then you have to buy a trx250r and get rid of suzuki. Then you have got rid of your zuk fever. The only thing left is riding ability.

But ona serious note i think it would be a great conversion if you didnt mind alittle bit of shaking going on. I would try to get alater model rm250 engine because the companies are just making more power with them they are becoming more reliable. This is where all the companies are putting all their money into heck know s that they are not putting it into the quads. ho-pefully the only modification that you would need are some new motor mounts because the motorcycles are pretty thin. Only thing really in setting the motor that i would worry about is sprocket location and i would also check if you would have height to put the motor in, in a bad senario you would have to take your gas tank off to change the spark plug and in the worst worst case have a new gas tank built that would have a place where the spark plug could kinda fit up higher but that would be worst case because you probably would not want to drop any rails with the way you ride.
yes, you do know me and sorry if you have taken offence to any of the posts that i have made to you; they have all just been jokes.

all in good fun

 

i've been doing a little homework on the different RM's...

from what i've studied, the rm engine is basically the same from '93-95, only differences is that the '95 has some different porting in an attempt to generate more low end. the porting in these gives real strong mid range hit and gobs of top end. additional porting will make them even stronger mid to top...but bring out some low end too.
the '96-2000 are almost identical and i would like to get a newer one, but $$ is the problem on it first. they changed the cases & all, from the '95, the reed valve is back in the cylinder as opposed to in the cases. the engine does have a significantly better low end, but top end suffers because of power valve design (rotary type w/ a flat spot)

for a dunes machine, isn't more top end better?.. (for more wheelspin?) ... like '93-95 rm's
but for MX you need more of a broad range... more tractable power... more low end, but still have top end? correct?... like the '96-pres... but with more top end.... add'l porting again?

so if these are true.. then a '93-'95 with porting head mods for an all-around power increase would be about the best... wouldn't it? gotta run race gas... but it'd have power to go

on the parts end, i have to agree that a newer engine would be better too, more aftermarket is available for newer bikes...

 

i just heard word that the transmission's and clutches were weak in the '96+ RM's...so that just got the ax on the list.

the other choice i have is the RMX motor.. which from what i told, is much more durable to begin with. time to studydeeper.

 

Whats the difference between the rm and rmx? they are both 2 strokes right?

 

they are both 2-strokes, but are different in distinct ways, each built for the type of riding they would normally be used for. until the WR400 came out the RMX had the title of being the fastest woods bike around.

the RM is a dedicated MX bike, no lighting coil from the factory, less flywheel weight, (rev's up much quicker for more snap), porting is usually geared for more top end performance, and they expect the usuer to perform more frequent maintenence, shock & fork are valved to take harder hits from higher jumps, they also make the parts(such as transmissions & cases) as lightweight as possible, sometimes stretching the limit too far and things break... they usually contain more state-of-the-art parts all around for an MX bike to be competitive.

the RMX is more of a woods/enduro bike. has a lighting coil, and heavier flywheel & porting for more torque(so to not stall it as easy on hills), the cases & clutch are heavier duty (they expect more abuse, less maintenance) and the factory was not as concerned about overall weight of the bike (which still was not that heavy 240-250lbs dry??), the suspension is slightly softer to take up the smaller stuff found in trail & enduro riding but still some med. to lg. size jumps. (they didn't get upside-down forks until '97 i think)

if i'm correct, the '88-92 LT250R had a number of parts in common with the RMX of the late '80s & early '90's too, but i don't think the RMX had a counterbalancer in the engine.

the other big difference is in the transmission, the RMX is geared lower in 1st gear & higher in 5th than the RM.(hmmmm.. )
i just read that the trick to milk more power from the RMX is to put a RM cylinder & head on, giving it significantly more top end.