200x swap to trx400ex engine

[f22parts]

I want double the engine I have on my 200x 1985 and the 400ex engine for the TRX200ex quad look like it mite work. They bother are air cooled, the 400ex engine has and additional oil cooler with I want also. Has this been done before?

[Tri-Z Pilot]

I think you mean TRX400EX. The TRX200SX I think it was has a lot more in common with the first gen 200x's.
You're better off just pickin up a 350X, better suspension, and they'll outright walk all over a 400EX. With a couple mods that is.

[TatTooL23]

I agree. U would be better of with a modded or bored 350X.

[snakefinder]

what can you do to a 200x that you don't have to get a different wheeler

[250rRoostmaster]

Nothing you can do to a 200x to make it compete with a 400ex or a 350x....

[atc350xer]

plus, a 400ex motor will almost bolt right into a 350x (I almost went that route at one point)

[snakefinder]

has anyone put a 250r motor in a 200x frame?

[250rRoostmaster]

I think someone on here is doing a 250r/200x swap build right now but can't quite remember... I'll look around for the thread..

[Tri-Z Pilot]

One, why would you put a 400ex motor in a 350x? (Maybe parts availability I suppose)

Two Why put a 250R motor in a 200x? The 250R has better suspension, and with the money/hassle of modding the 200x frame why not just buy a 250R? Hell you can get a nice 83-84 250R (2nd gen) fairly cheap. But the best 250R is the 85-86 (3rd gen)

If you wanna put anything in that 200x frame I'd go with a Yamaha Blaster motor. 200 two stroke (actually 195) and they are fairly cheap and plentiful, plus the Blaster has aftermarket stuff out the wazoo, even a 240 big bore kit. And let me tell you, I rode a 240 Blaster before and I could smoke a 400ex no prob.

As far as modding your 200x, you could go with a bigger cam, aftermarket pipe, port and polish, bigger carb, and a 10.25 high compression piston kit. Even a pipe and cam will give you more power than you think, but it all takes money.

[Tri-Z Pilot]

As far as boring and stroking the 200x motor, thats a no go as Honda was already at their limit when they designed the 200x, seeing as it is basically a bored and stroked 175 enduro motorcycle motor I believe.You are better off selling the 200x and buying something bigger.As the old addage goes "There is no replacement for displacement"

[snakefinder]

thanks for all the input guys just throwing some thoughts around.
it's always nice to have something that no one has seen at least for awhile.

[leevarnado]

few members here have smoked stock 350x's with modded 200x's.

[Tri-Z Pilot]

I forget who it was, but someone at Brapp's Pennsyltucky 09 had an 86200x that was modded to the gills, and that mother would RUN! Raffa, Louis Mieke, The Great Gazoo, or Trizilla might remember what i'm talking about.
I almost wanna say it was Louis's trike, but am not positive.

I think if anything a Blaster motor, or even a CR125 (just to stay Honda) would be an awesome cadidate. Come to think of it a member on here may have done or talked about doing a first gen 200x with a CR125 motor, (try a search)
A 200x with a CR125 powerplant would be the cats balls in my opinion. Nice and light and would revv to the moon. The biggest challenge would prob be fabbin up the pipe, but what a sweet ride!

[Xpress]

Keep in mind the first gen 200X frames are built just enough to handle the average rider with the 200 engine. No way it would live for long with anything much bigger.

And yes there have been a few 200X project bikes that will outright smoke a 350 or 400EX.

[greenhuman]

The early 200X is not out to its limit on the stroke. The CRF230 is a 66.3 stroke and its the same diameter as the 200X crank.
People would be really surprised at how a bored and stroked 200X runs.

[Tri-Z Pilot]

Greenhuman, are you saying a CRF230 has some balls for the size of the motor?

[f22parts]

All that sounds good for most people. I was thinking of a CBR500 motor. Something thats wild but will work relatively easy without cutting the frame all up and something that I could use that stock gas tank with. The cbr500 would not allow for the stock gas tank but they must be something out there...lol

[Tri-Z Pilot]

F22, I'm sorry but you got the wrong idea. For something like the first gen 200x you would need a smaller lighter motor, that tubing just isnt that thick at all. For as radical as you are thinking you would need a custom bent/built chassis or a better suited trike chassis like a 350x (something that already houses a tall motor)
But nine times out of 10 most of the guys on here that build big motor trikes only ride them occasionally , they actually prefer their stock chassis trikes for everday use. Plus something like you are thinking would only be well suited for the dunes.
If you want something bigger, trust me, save up for a 350x. I guarantee you'll love the hell outta it compared to a 200x.
With all the money that would be involved in your type of conversion you could buy whatever you wanted, maybe even two bikes.
If you want some raw arm ripping power go with one of the big 3's 250 two stroke trikes. I myself would recommend an 85-86 ATC250R.