XR 500 or 600 to 350X engine swap???

[350xhilaration]

Has anyone had any experience with this swap of complete engines? If so what alterations needed to be made to accomodate the larger engine?

The "Something to think about" thread did just that...makin' me think:demon:

[Mr. Richard]

alot of frame streching and alot of work,, theres a guy doing it on 3ww right now,,,,,,,

[350xhilaration]

OK, back to the topend swap research, thanks, I'm not hacking the Garage Queens frame, thats the question I needed answered .thanks

[HondaATC500X]

As I said in a previous post, Its not that bad of a swap but its not easy either. Mine isn't done yet, and I'm not sure when it'll be done. I'm setting mine up with CR500 suspension all the way around (89 Inverted forks on the front) and a Progressive CR500 shock on the rear. I have to make a new swingarm, tripple clamps, ect and other minor things for the suspension system. I can understand the not wanting to hack up a good frame idea, but mine wasn't really a good one to start with. I consider doing what I did as saving it. I think anyone with a fairly good mechanical skills and some time, effort and of course green stamps could do one. I'm being really anal about mine, so its taking a while. Plus I'm outa cash...for now ;)

[ATCRYDER]

350xhiliartion.....heres an idea from my book for ya:

XR400 DirtBike....Custom or Fitted 350X/400ex swingarm & a 350X or 250R front end....boom: 400EX 3 wheeler.

Ditto using an XR500, 600, 650 (whatever).

Good luck with whatever ya do,
Rob

[350xhilaration]

Converting a Bike to a trike??? like that white 350X in Dirt Wheels a few months ago?? Nice idea, just not a viable option for me at this stage. Thanks for input anyway.

[ATCRYDER]

That idea was more of a concept than a proven technique---Right now Im doing a little research on the measurements between the 350X swinger & the XR350 Swinger----If youre interested, I can share them with ya.

Rob

[Tecate performance]

In the March 95 Dirt Wheels there is a 500x motor in a trx250r that is based on 350x motor. Four Stroke Tech used a 79-81 XR500 (non RFVC) head for better valves and flow over 350's. The cylinder was bored for a 97mm piston and cases machined for clearance. Kept stroke stock. It had a 36 mikuni carb and reworked advance curve for CDI. When you go that big though you should get a heavy duty rod.

[350xhilaration]

Would anyone happen to have a scan of this article or any updates on their project? A friend of mine has a complete 81 XR 500. He also has another complete top end. He's going to check what parts he has and let me know if he will part with them.
Talk about bringing back a dead thread:doh:

[Tecate performance]

i can email you a scan of the article. the main problem with running the bigger motors is they're taller which makes it harder to fit inside the frame without cutting. you might be better off using the 350x cylinder, resleeved for the bigger pistons (90-97mm), and or stroke it, then using the xr head. that way the motor should be about the same height.

[350xhilaration]

If you could scan and email it to the account associated with my user here...that would be great...I may not do it, just some info for the future in the event of a beat 350X coming along that I wouldnt mind cutting up. Mine will prolly never get cut. Too nice.

[Tyler 54]

Kind of ironic this thread brought up. Last winter My friend aqquired a "big bore kit" off ebay. The guy claimed that it was all custom with a stroker crank. The auction was just for the cylinder and piston, but after the auction the guy found the crank as well, so he threw it in with the cylinder. ANYWAY... This so called kit was a custom job, they took a 350X jug, and made a XR500 Sleeve fit in it...I thought no way in hell would this thing ever work. However, he got the kit, milled the cases to fit the bigger sleeve, and installed the crank.

WOW that thing had some power, and it was in a 250X frame, with R suspension all the way around. He is currently rebuilding it(blew a hole in piston) I could get some info from him if I knew exactly what you are looking for:thumbsup:

[ridetrikes250R]

iam a 2 stroke fan so 4 strokes i only know alittle about, but!
take a xr400 engine k 4 valve head! (i think) take stick that in the X fits nice huh? yah then get a hot cam and a 440 big bore for it stick a 12:1 in it and then get a trick CDI and there u have a easy 45+ ponies and a reliable sucker to!
adam:headbang:

[Blown 331]

Are you saying they put the top end of an XR500 on the bottom end of a 350X? Hmmmm. I've got 4 XR500's.

[350xhilaration]

That's what they say. I havent heard back from my buddy yet. I think they have to be 81-82 xr500

[Blown 331]

Originally posted by 350xhilaration
That's what they say. I havent heard back from my buddy yet. I think they have to be 81-82 xr500

I have 3 1982 XR500's. On of them has a fresh bore and 10.5 to 1 piston. I haven't even got it back together yet. Looks like I need a 350X now.

[Tecate performance]

they need to be non RFVC, so 81-82 or whenever that was.

350xhilleration, do you still want a scan of that article? its only like a page and a half long. let me know

[Blown 331]

If it's not too much trouble could you also send me a scan as well? schilling50@hotmail.com. Thanks.

[Tecate performance]

350xhileration, where do you want me to send the article too? i don't think the email service on this site allows attachments.

blown331, i sent you a scan.

[BIG BAD RED]

does the 350x run a 2 or a 4 valve head???

[Blown 331]

350X is 4 valve.

[ridetrikes250R]

the 350x was a 3 valve head with one intake and two exhaust?
adam:headbang: :headbang: :headbang:

[short4stuff]

Originally posted by ridetrikes250R
the 350x was a 3 valve head with one intake and two exhaust?
adam:headbang: :headbang: :headbang:

:doh:

[350XXX]

i'm pretty sure it can be a 79-82 XR 500 sleeve.

[BIG BAD RED]

ill get out the la' sleve book at work and check the numbers on what you can run...just get me some of the specs off on the stock...stroke bore crank in mm crank pin diam along with gudgin pin'

[shanes1967]

i just finished a xr650 elec. start three wheeler. trick is to use the xr650 frame because it has the oil tank for the engine in the tubes of the frame. see my pics.

[shanes1967]

check out my bike i built xr650 three wheeler

[shanes1967]

heres my xr650. really nice to have electric start