350X engine in an '85 250R frame?

[Hedbngr18]

First off, this project is a few years down the line. So nobody get too excited! Also, I am sure there is a previous thread on this exact subject on here somewhere. But, I was on the phone with a friend the other day and after watching the 350X documentary on Youtube and decided that instead of building a 3rd 250R, I'd rather have a well suspended 4 stroke to cruise out in Occotillo Wells for my dirt loving friends that I tolerate. It probably won't see the dunes very often, as I have two 3rd gen Rs and a 500 conversion already. If anyone could point me in the direction of any previous threads or users that may have some answers, I would be eternally grateful! Thanks all!

[fabiodriven]

Personal opinion, you'd be much better off re-suspending the X. Inverts in the front and I'm not sure what you'd do in the rear, but I don't see the benefits of the R frame out weighing the massive amounts of fabrication that's going to entail.

[yaegerb]

x2...get your forks and rear shock revalved and set up for you. That's as easy as sending it off

[DohcBikes]

First off, this project is a few years down the line. So nobody get too excited!

Sounds like a plan.

[Dirtcrasher]

I have inverts and an Axis shock on mine.

It's amazing.....

[atc300r]

It would take alot of fab work.Im putting a 200x motor in a 85 250r frame and I had to cut the engine cradle just to fit my mockup motor in.May have to cut it out completely.Doesnt Richard have a 350x with 250r swingarm and frontend or inverts on it.That would be the way to go.

[plevib]

Yup..... plus why would you cut up a good trike.

[plevib]

But in all seriousness you will run into issues with the frame being in the way of your intake, but I say go for it! You'll have to make goofy intake but mine works wonderfully. But at this point it seems like more of a pipe dream... (I've got plenty of those too)

http://www.3wheelerworld.com/showthr...NEW-ride-video!

[Hedbngr18]

Personal opinion, you'd be much better off re-suspending the X. Inverts in the front and I'm not sure what you'd do in the rear, but I don't see the benefits of the R frame out weighing the massive amounts of fabrication that's going to entail.

Well, the main idea for this build is that I already have the R frame and rear end. Would I be better off possibly trading the R frame for an X and starting from there? I know the R is not only thicker, but just more solid all around. I am definitely a fan of the no cutting and welding idea as I have no welding ability. If the R swinger fits, I would much rather go that route. Ideas?

[plevib]

Well, the main idea for this build is that I already have the R frame and rear end. Would I be better off possibly trading the R frame for an X and starting from there? I know the R is not only thicker, but just more solid all around. I am definitely a fan of the no cutting and welding idea as I have no welding ability. If the R swinger fits, I would much rather go that route. Ideas?

Well, I don't mean to be a debby downer but you're not going to do a motor swap without welding anything. .....

[oldskool83]

R tank will hit motor.

[JesseA420]

sell the 250r swinger and frame, use the money to setup suspension on 350x properly.
done.

[oldskool83]

I'll buy the 250R swinger and and frame. See done deal.

[Dirtcrasher]

I wouldn't even try to put a 350X motor in an R frame.

If you go the 350X route, the invert fork auctions run about 250$ on EBAY. Rebuilt and shortened with new seals for 300$, Then you need to buy custom fork clamps ( IDK what these guys charge now but they are all very trustworthy people with great products from Jason Hall, Richard (KASEY) and or another member Louis Mielke).
Also a 350X stem, fork guards, brake hose guide and an entire set of front brakes with the rotor, caliper, pads, master, bracket, line etc etc. And a rotor adapter for a 350X or 250R front hub.

The rear shock, can be changed to a 250R and valved better by Milner Brown (Onformula1). I'm sure he has other options as well.

I bought a custom AXIS with a 350X top mount and a 450R lower with hi and low speed compression and rebound damping and the "soft ride" system. I modified and used a 08 TRX450 aluminum swingarm which is about a plus 2.5" longer than stock 350X.

The bottom of the 350X frame needs a very stout mount for the linkage and lots of gusseting is required. You'll need all that linkage as well.

I have 4000$ in suspension alone.....

It's not an easy job. You need to duplicate how far back and down the linkage hole goes or the geometry is all wrong.

[fabiodriven]

I didn't have time to reply earlier but I was going to recommend you ask Dirtcrasher what to do.