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Discussion Starter · #1 ·
Hello everyone...I was lounging around & Kevin yelled out to me, there's a titled RD250 rolling chassis, just went on Craigslist, for $50. Well, I have a couple extra engines...I ran over there in my PU, checked the frame no. on the title, it matched. Funny thing is I was a bit hasty, didn't even look at the frame closely..it's not near an RD frame, actually it's a '74 TX500A less motor. No wonder I didn't recognize the frame no. prefix. LOL damn I'm dumb sometimes!! That's okay, for $50 with the title I can't go wrong. Very little rust & all there except engine, carbs & exhaust. I think the relatively tall, lower slung frame would be ideal to fit a MX motor like that.

Anyway the wheels are turning in my head, I'd like adapt a 2-stroke dirt bike motor into it, like a CR500..it'd be a rocket! What kind of electronic black magic would it take to adapt a motor like that (CR500) to it's system, anyone have ideas here? Designing, aligning and Welding motor mounts would be relatively easy part...
 

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Discussion Starter · #3 ·
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CR500 motors are getting a little hard to find. Plus they vibrate ALOT.
Well, I have a cylinder from I believe an old YZ490. No bottom end or cases. Just how much does a CR500 vibrate? Worse than an RD350? I have a book which explains how to make custom molded rubber pieces. It wouldn't be very difficult to make custom rubber mount dampers for any engine, just offset the placement of the metal mounts wide enough to fit the dampers. I keep around several thicknesses of rubber which could be readily cut & epoxied to them in the same manner.
 

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Discussion Starter · #12 ·
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I've got an 86' CR500 engine that I will sell for $800, or consider any interesting trades. The engine is currently in an ice racer and comes with a lug that can be put in the end of the crank so an electric starter can be used. It also has a brandy new Wiseco piston in it, but I haven't started it because the carb needs to cleaned, got spark, but she just pops after many kicks like she's not getting gas. I haven't had time to dick with it. I've got $1200 in it. That'd be a nasty little Sunday morning rider.
Dgy 518 674 4045
I'm perusing ideas for the somewhat distant future...like the rest of you, I have lots of ongoing projects and/or items to fix on running bikes. I'd love to buy that engine but my first priority right now besides my caliper bracket design is to start on the RD400F Daytona Special.

I'm not really concerned about having an electric starter, I haven't even looked closely on the TX roller to see if it has one; probably, since just about the only bikes of those years that didn't are RDs and MX bikes! In talking to one of my other vintage friends the main concern seems to be adapting a generator to it, or a bigger one. What type of power generation source does a CR500 motor use to power the (presumably) electronic ignition? Since MX bikes don't have lights, I'd have to have a way to generate power for them. Yep it would be NASTY fast, for sure. Speaking of sprockets, I didn't count the teeth but the rear sprocket that's on it now looks to be pretty big, at least 48T I'd say.

Lee (Swagger) what were the names of those yards? Those were two I hadn't heard of. Can you email me the names and/or addresses.
And hey, if you help me figure out how to adapt the electrics, you DEFINITELY could ride it anytime!

Edited by - Quicklimegirl on Jan 08 2007 8:14:36 PM
 
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