250x vs. 300ex

[kernalklink]

I was searching around and i got my eye on a 87 250x. it's in pretty sore shape, but i hear that almost everything 300ex is direct bolt on. How true is this, i have located a 300ex motor, shells and othe misc parts, should i be safe in assuming this would be a sweet project, or, like it seems, is it too good to be true?

[69HemiGTX]

The 300EX is essentially the exact same quad as the 250X, just with a larger displacement engine and an electric starter. Everything from the 300EX will bolt onto the 250X and vice versa.

[Modded660R2fast]

Very true it all bolts on to each other. If you even look at the engines there isnt any size difference. But i must warn you those things are pretty quick but once you put a turbo on them ther insane. They make then like 50HP

[OldSchoolin86]

if you swap motors you'll need to swap wire harnesses and fab something up for a battery mount. The only difference displacement wise is about 35cc due to a longer stroke. The rest is all the same.

[Blown 331]

I had 300EX fenders on my 250X. I also bought 300EX a-arms, tie rods, hubs, spindles, rotors etc but someone stole it before I put them on! I went with a 250X over a 300EX cause I wanted the kicker.

[kernalklink]

well hell yea! My dad has a 250ex(the one in my sig) besides the larger displacement, manual clutch and other various differences, is the 300ex in fact that much better of a machine, I do alot of forest riding and the 250ex is very nice, but i want something with a little more kick!

[Blown 331]

well hell yea! My dad has a 250ex(the one in my sig) besides the larger displacement, manual clutch and other various differences, is the 300ex in fact that much better of a machine, I do alot of forest riding and the 250ex is very nice, but i want something with a little more kick!


We are talking about a 250X not a 250EX. A 250X is chain drive, manual clutch. 1991 or 1992 was the last year.

[kernalklink]

Sorry i got off subject and didnt explain much. I was wondering, as far as getting a new machine because i havent decided on the 250x as of just yet. I was looking at some newer quads as well as the 250x. as far as newer quads go i was looking at either a 2002 250ex or a 2000 300ex, how much differences have people noticed between these machines?

although i would much rather buy the 250x and rebuild it, something makes me want something that i can ride right away!

[Blown 331]

I would most definelty go with a 250X/300EX over a 250EX. The 250EX has the sideways motor, auto clutch, shaft drive. Where the 250X/300EX are chain and hand clutch. But over all of those I'd recomend getting a 400EX, great bike.

[OldSchoolin86]

I would most definelty go with a 250X/300EX over a 250EX. The 250EX has the sideways motor, auto clutch, shaft drive. Where the 250X/300EX are chain and hand clutch. But over all of those I'd recomend getting a 400EX, great bike.
I agree. With all the 450's out now you'll find some pretty nice deals too.

[kernalklink]

my sisters boyfriend has a 400ex and i just love it, I just cant afford one new enough to have reverse! Like i said i do alot of forest riding and to not have reverse..... well you know.

[Rm250RF900R]

My friend used to have a 250ex. Like said before, sideways motor, auto clutch, and shaft drive. It was slow. They consider it a sports quad but I dont see why. Sure the relaibility may be good, but its slow. I used to beable to beat one on my xr100r. If i were you i would go for the 300ex or 250x. Nice bikes, great for trails, enough motor to get you anywhere. I have one sitting in my yard. But this one has severe motor problems and its a 2001. Still good enough for the trails, will climb any hill you want.

[Blown 331]

I can't believe I'm gonna recommend a non-Honda but if you must have reverse you could look into a Z/KFX400. They are getting pretty cheap as well.

[kernalklink]

I can't believe I'm gonna recommend a non-Honda but if you must have reverse you could look into a Z/KFX400. They are getting pretty cheap as well.

Yea I cant believe you did that... but my friend has a kfx400 and it is a beautiful machine, so at least i agree with you!

[Wickedfinger]

But i must warn you those things are pretty quick but once you put a turbo on them ther insane. They make then like 50HP.Gonna have to put up the BS flag on that one :crazy: No turbo or nitrus is going to almost triple horsepower. The 250X was rated at just under 16 HP from the factory, the 300EX 17. The differences between the two are minimal but If you were to race them side by side, it usually comes down to rider skill and traction as to who wins the race. Mechanically, the one big advantage the 250X had over the 300EX is the 36mm carb vs the 32mm. The weight difference is minimal.

[Rm250RF900R]

300ex has reverse.

[Mosh]

i would go with the 250x over the 300. the stroke was shorter in the 250x and the compression is higher. this made the 250x rev a little better than the 300.plus the reverse is way easier to use on the 250x.and the 250x is lighter than the 300.speed wise,the 250 will keep up with a 300ex thru 3rd gear.the 300 was not much faster.plus i like the kickstart over a battery deal. all parts will change over but the front wheels on the 87and 88 250x had a larger bolt pattern than the 91and 92 250x and 300exs.so the 87 -88 front rims only fit the 87-88 250x front hubs.91and92 250x switched over to the 300ex front hubs.allthat was different was the bolt spacing.the hubs however will fit all years.so dont think you will put 300ex front wheels on 87-88 250x front hubs unless you switch the hubs too.

[Modded660R2fast]

Gonna have to put up the BS flag on that one :crazy: No turbo or nitrus is going to almost triple horsepower. The 250X was rated at just under 16 HP from the factory, the 300EX 17. The differences between the two are minimal but If you were to race them side by side, it usually comes down to rider skill and traction as to who wins the race. Mechanically, the one big advantage the 250X had over the 300EX is the 36mm carb vs the 32mm. The weight difference is minimal.


Im sorry i didnt mean just a turbo would boost the HP to like 50 it takes porting & plolishing and much more extensive work to get it to 50Hp but it does.

[OldSchoolin86]

my sisters boyfriend has a 400ex and i just love it, I just cant afford one new enough to have reverse! Like i said i do alot of forest riding and to not have reverse..... well you know.
I've been a woods rider for life and I'd take the non-reverse 400ex over a 250x/300ex anyday!

[kernalklink]

opening new thread, got a different 4-wheeler

[yater]

Im sorry i didnt mean just a turbo would boost the HP to like 50 it takes porting & plolishing and much more extensive work to get it to 50Hp but it does.

No, the 250x can't make 50hp...no matter what. My dr650 makes a mild 37hp from the factory. The honda xr650r (the one they race in baja) makes about 50hp. The crf450 makes about the same I believe?

[kernalklink]

No, the 250x can't make 50hp...no matter what. My dr650 makes a mild 37hp from the factory. The honda xr650r (the one they race in baja) makes about 50hp. The crf450 makes about the same I believe?

I dont know if I would say can't, I've never done it, but im sure it can be done. It may not be worth spending the money, and i certainly wouldn't, but i bet it could be done.

[yater]

The 250x bottom end wouldn't handle 50hp even if you could squeeze it out of that jug. You're talking about a 150+% hp increase

[jason85atc250r]

TC racing build a 250x engine thats bored and stroked out to a 368cc that puts out around 45 horsepower. my friend raced one in the mid 90's. he never had tranny problems

TC's 475cc 350x motor puts out 55 to 60 horsepower.

my friend now has a yz 426 in a 250r quad thats built and put out around 60 horses. Tc makes a 520cc 350x motor that a guy he raced flat track agianst had and he could not hang with him. the guy wooped him every time.

[monster 84r]

id go with the 300ex. my friend has an 03 300ex, and its pretty torqey for its size.

we drag race all of the time, he has a 300$ pro circuit exhaust on it, which made a HUGE! difference. before the slip on, he was way behind, now if i let up he can keep up.

but if i ride the 250r like i should, hes no where in sight.
the ex is a fun bike though. the suspention is crap, and its a little too narrow for my liking. other than that its fun.

[kernalklink]

i ended up getting an 89 Mojave, it was free, and it is a decent setup, strong engine reverse nice suspension. I'm fairly happy with it, but the shift rod has broke and i was quoted about $800 for repair, and the front end bushing are all shot. so it will be a while.