250-500cc from WR250 to WR360

Hi, i´m new member and i have first question about WR250/WR360 models of year 1994-6. I read on other website this: "The bottoms of this engines are the same. Different are only cylinder, piston, piston rod and head. So if you want tune engine of wr250 you will have to change only these parts."
My question is: Is it true??
..thanks for answers

Somebody doesn´t know??

yea thanks for answers. I mean 250 is good bike, but i like changes and this was only my thought how i can get more horse power from this bike. I never ride husky 360 so is it something like Honda cr500??

You'd have to have a piston kit, cylinder, power valves, head, a complete crank because it has a longer stroke so a rod alone won't do it, and all the gaskets and seals. I think that's everything, but their might be a couple of other parts that will need swapped, too because there is a probable different ignition mapping.

I'd guess it to be cheaper to buy a used 360 and swap motors than try to turn a 250 into a 360. I just saw a 360 for $2000.00 US.

Or look into putting one of the new 300 top ends on the 250 bottom.

I don't know about the earlier 360's but the later ones '00 and up are a different engine from the 250's of the same time span. By this I mean the barrel, crank, rod, piston, head and power valve assembly.

I do know that engine mounting etc is the same. You can bolt a 360 engine in place of a 250. I've done it.

As far as Motosportz saying the 250 is better than a 300 or a 360 as an owner of both I'd love to say he doesn't know what he is talking about but the truth is I agree

I went from a 250 to a 360 to a 300 and back to a 250. I still have a WR 360 and a WR250. I sold the Gas Gas 300 I owned in between. 360's are fun to ride but a 250 is better suited to most riding.

PS I don't find 360's hard to start, they just require the correct technique. I don't have a decomp head and I can start my 360 first kick, even in gear.

My next mod on my '06 WR250 is the 6-speed tranny swap. I DS my WR and it's horrible with the 5-speed. It seems very easy to do...

Since they don't produce a 360 anymore probably explains the reason. Not a favorable bike in most cases.

I am with Kelly on this. The WR250 is faster/easier to ride in 95% of any riding you will do virtually anywhere. That said I really like my 360 and will always keep it, I just don't ride it as much as my 250. I have done a lot of work($$$) to make my 360 better and it is just about as good as it gets right now, with the auto clutch, flywheel weight, G-2 throttle, Pwk carb, LTR susp., ported intake and 3.4 gal. tank. It is very easy to ride without jerking your arms out and will now pull hard at least 1500 rpm higher than before when you really want to get with it. Question is was it worth all the $ spent....what else would a childless fat old guy spend his money on....golf clubs

Walt

Update on my 6-speed tranny swap to my '06 WR250. Instead, I've went with the Overdrive 5th mod. Close-ratio up to 4th gear, then cruise time in 5th for street use. You can run as low as 13/50 gearing and still easily cruise 65mph.

Compare that to now, where I'm at 14/47...and hittin' 50mph at 7,000rpm. That just ain't gonna get it on the street.

Sounds cool

I need more details. This is the first I've heard of this mod. What is involved? Just changing the 5th gear ratio? If so, what gear set from what bike/model?

Gem,

From 99 to 01 they put a true wide ratio 5 speed in the WR250. Why they went back to the CR is beyond me but I am sure there is an accountant involved. The WR 5 speed has very similar 1st thru 4th to the CR but with very slightly larger gaps and then 5th is significantly overdriven. I ran this tranny for a year before I switched it over to a 6 speed. It is a decent compromise to the CR tranny with decent rideability in typical single track in 1st thru 4th but the jump to 5th is a bogger if you are going up hill and don't have it revved out in 4th. I ran 13x50 gearing to help and it made the bog much less noticeable and would still pull mid 80's top end.

The best part about making the swap to the WR 5 speed is you use all your current tranny parts except the gear clusters themselves. Yanni was going to install this tranny in his WR250, but I think he has made up his mind to convert his WR to a 360. If you are interested in the WR 5 speed send me a PM. I still think the swap to a 6 speed is the best way to go but you will need to change out many more parts and it is best to find a complete bottom end to make sure they all work.

Walt

Well said Walt. Wallybean is correct. In my search for the perfect bottom end/tranny...I've come to realize that the 360 mill is where it's at. She's goin' in as soon as I find a mill to transplant. If ya'll find one, let a Husky brutha know....

I know what your after as I have done the swap you want to do. I have my 360 engine in the '07 chassis. I also have a Hebo hydraulic clutch on it.

I was just curious about the taller 5th gear option for the 250 as I think it would benefit from it. Not sure I would ever really do it as I use the 250 for really tight gnarly stuff and hardly ever use 5th now. I do prefer the 250 for harescrambles and a taller 5th would be nice for some transition sections.

Hi, I know it is a really old post, but would anyone have info on how to do the overdrive 5th gear on a WR250? mine is a 2006 and would love to have the longer gear for cruising.