250R questions

[jleable]

In my local paper there is a 86 250r for sale, it has a 350x motor in it though, can someone please tell me about the 350x motor. 2 or 4 stroke? and how much horse power it makes? Do you think this is a good buy for $2500

[wheeltrax]

The 350x is a 4 stroke.

ATC 350X
displacement: 349cc
bore x stroke: 81x68mm
compression ratio: 8.5:1
carburetion: 34mm Keihin
transmission speeds: 6

Im not sure about HP output, but they are a good motor from what i have heard and seen.

yeah i would say thats a good deal.A 350x in a 3 wheeler frame will run with a 400ex from what i heard.

[AndrewRRR]

I wouldn't jump into the deal. Someone changed the motor so you'll have to make sure it was done right, and find out more about the 350X motor. I think they were comparable to the 250r power stock. But there aren't nearly as many hop-up parts for a 350X motor as for a 250r. Also, certain things like pipes might have to be custom made since the original bike was a trike.

[310Rduner]

if the weight of the 350x motor is comparable to that of a 400ex, why dont many racers use that if like somebody already mentioned it has a 6th gear. from what ive heard thats the biggest prob with 400ex to 440 racers. but if everything was comparable would that seem a decent alternative? just make it 440, same weight plus 6th gear.

o well im wrong, but i wanna hear why lol.

andrew makes a few good points look it over
& maybe consider putting a R motor back in it
unless you dont like 2 strokes

[jleable]

I was looking at this quad for a friend and it was in his price range. I thought it wouldn't be bad since you can always put the original motor back in it. Plus its a 250r frame and suspension. Also are the ATC 250r three wheelers motor the same as the quad?

[wilkin250r]

If the frame has been modified to accept the 350x, is it going to be as simple as "just put the R motor back in?"

I beleive 85 atc will work ,I know 86 ATC will work in a 86 TRX

[250rpilot]

the 85 and up atc motors were liquid cooled, the 84 and down were air cooled. the 85-86 motor is the same, after that, they changed minor things every year.

[AndrewRRR]

I'm 99.9% sure the 350X and the 250r (both atc and trx) use different motor mounts, so even if you can find a decent 250r motor (which will probably run you at LEAST a grand) you will have to do lots of cutting and welding, which we all love dont we? hehe
If he wants a 250r with a 350x motor I'd say go for it. If he wants a 250r with a 250r motor i'd pass it up in a heartbeat.
I say this assuming the rest of the bike is in good condition. Frame cracks, bends, welds, unusual things sour the deal further. Unless he's looking for 250r geometry with 4 stroke grunt I would pass this deal up.