Posts
767
Joined
4/1/2008
Location
Stillwater, OK
US
Edited Date/Time
11/27/2020 8:09pm
Well last year I pretty much sold off all my Maicos and Bultacos when I opened my track here in Oklahoma. I talked myself out of going to Diamond Dons this year but Coop has talked me back into it. I'm going to race his Penton 400 on Saturday and purchased a 1982 RM250 yesterday that's going to need quite a bit.
When I got it home today I noticed some things that just weren't typical of your roached CL bike. It appeared someone had just pulled it down to the frame and painted the frame, It also had new chain sliders, chain rollers, new coil, and a few other new goodies. He even gave me a brand new clymer manual with the bike. I didn't do a compression test right away but I decided to pull the cylinder off and see what she looked like. To my surprise the cylinder looked great and had a brand new OEM .25 over piston installed, you could tell this bikes never been ran since the piston was put in.
The bike still doesn't even try to pop off, I can see that the ignition wire plugs are missing and they've clamped them together. To the naked eye it looks to me like the bike sometimes fires and sometimes doesn't. Even when it does I'm not convinced it's firing well. If I was 100$ convinced that would get this motor going for Diamond Dons I would probably just buy a PVL, but I'm not. Times an issue with it so I don't see me doing a full rebuild on the motor, basicly freshening up the suspension, replacing some linkage bushings and bearings, etc.
Anyone happen to have a spare ignition setup for one of these? It would be nice to have something known good to test with.
When I got it home today I noticed some things that just weren't typical of your roached CL bike. It appeared someone had just pulled it down to the frame and painted the frame, It also had new chain sliders, chain rollers, new coil, and a few other new goodies. He even gave me a brand new clymer manual with the bike. I didn't do a compression test right away but I decided to pull the cylinder off and see what she looked like. To my surprise the cylinder looked great and had a brand new OEM .25 over piston installed, you could tell this bikes never been ran since the piston was put in.
The bike still doesn't even try to pop off, I can see that the ignition wire plugs are missing and they've clamped them together. To the naked eye it looks to me like the bike sometimes fires and sometimes doesn't. Even when it does I'm not convinced it's firing well. If I was 100$ convinced that would get this motor going for Diamond Dons I would probably just buy a PVL, but I'm not. Times an issue with it so I don't see me doing a full rebuild on the motor, basicly freshening up the suspension, replacing some linkage bushings and bearings, etc.
Anyone happen to have a spare ignition setup for one of these? It would be nice to have something known good to test with.
It has the OEM air box but will get the DC repop single sided if I get it running.
I was actually in Wichita picking up an XR200 for the cross country (Nothing funner than the 200cc cross country race).
I looked on the Topeka Craigslist and found this thing for $200 bucks but told myself it was just too far. I sent the ad to Coop and he told me I was crazy if I didn't go get, so here I am. He actually raced an 82 last year at DD and told me it was the best "vintage" bike he's ever raced.
The Shop
For that price I'm going to try it.
I do need to make sure he's gone wire to wire correctly. It has me wondering why though? As if maybe it's not the correct CDI for this Stator.
Another strange thing is the rebuild kit for this stator is the same kit for a late model RM85. I have a few late model rm85 cdi's laying around.........
Lots of work and 0 progress today, I took the shock apart thinking I would have the correct seals to rebuild the seal head, I did not.
The reeds were not fully closing so I installed a new set, still doesn't even try to pop off. Tested the compression at 160 psi..
Got my manual out and the color wires I have on my stator only show up on the 81 model stator. The CDI box on this bike and stator are hard wired together. It does produce spark but I just can't help but think I have some kind of ignition issue here. Again we're bypassing fuel issues and spraying fuel straight into the back of the carb just trying to get it to do something.
I'm literally at a loss when I have fuel, fire, and compression and it won't do anything.
Pit Row
Vintage is lots of fun. Most of it is figuring out the "fixes" that have been done in the previous 30 years.
http://fullfloater.com/
I used a complete '87 YZ80 system on my old '79 YZ250. Taper of the crank ends were the same, rotor / flywheel slid right on.
Look at this photo, see the wire that appears to go to a ground? (Has the round end). This was the wire that he ran into the kill switch. Now that I've disconnected the kill switch it's not hooked up to anything. I am still getting fire though but..................
As an update I went and messed with this today and it still did nothing. However I did have a complete stator and cdi from an rm85 and it bolted right up. Finally I have bright blue spark! Now it's popping and backfiring as if firing at the wrong time. I just came home from the shop and got to thinking, I put the entire RM85 setup on other than the flywheel, I probably should have put that flywheel on also.
The bike fired up on the very first kick and runs awesome! Pics to come as I start the "rebuild".
My 79 was idling on the stand. It started to sound funny when it was previously running perfect while I was getting googles on. I took off and was unridable by popping. New stator next week and I was back in business. I'm just saying there's different degrees of a bum stator
When I took the rear wheel off of this thing it seemed like the swingarm spread apart when I loosened the nut. The reason was because there was no brake side outer spacer. This is another part that is no longer available. I was hoping someone could help me out with the thickness of this spacer? I have the means to fab one if I knew how thick to make it.
Post a reply to: Said I wasn't going, but.... 1982 RM250 rebuild