1982 RM250Z Project

CamP
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CamP 8/11/2010 9:40am
8/11/2010 9:40am
Yes, the DG stuff is garbage. The stock pipe is best so if yours is in good shape, I wouldn't replace it. They are prone to cracking but that can easily be solved by replacing the pipe/silencer spring with a bicycle seatpost clamp and doubling up the springs at the exhaust manifold.

I would just repack the stock silencer or buy a new OEM silencer if the rest of the exhaust is in good shape.
barkhard696
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barkhard696 8/11/2010 10:05am
8/11/2010 10:05am
The only way to go with a replacement pipe is with JEMCO. Hand-made cone section. I have one on my bike. They are ~$215 or so, about what DG costs. DG's quality control has just been absolute junk for about 10 years now-- they are the Maier plastic of vintage pipes.

JEMCO is made right here in Houston. Jon is older, I can't imagine that he's going to be doing this too much longer. So over time his pipes should only appreciate, PLUS it's better than either the stocker or DG.
casedit
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casedit 8/11/2010 10:32am
8/11/2010 10:32am
Thanks Cam - i'm going to give the stock pipe a shot, it's been rewelded in the past with this ugly patch but so what, fresh coat of paint should be ok. Only cost would be the replacement silencer

barkhard - thanks - just curious...how do you think jemco compares to the stocker in terms of affects on the powerband? i'd hate to lose that '82 top end screammmm!
barkhard696
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barkhard696 8/11/2010 12:55pm
8/11/2010 12:55pm Edited Date/Time 8/11/2010 12:56pm
You really should talk to Marc Shade at FullFloater. He's the guy who built my 81 RM125 with 43mm forks and my 82 RM250-- and he turned me onto JEMCO. My understanding is that the top end stays the same with a slightly mellower mid. Whereas, DG: 1) never fits; 2) truncates the top.

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casedit
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casedit 8/17/2010 10:41am
8/17/2010 10:41am
Hey Cam - which seatpost clamp do you use on the pipe/silencer junction?
CamP
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CamP 8/17/2010 10:55am
8/17/2010 10:55am
casedit wrote:
Hey Cam - which seatpost clamp do you use on the pipe/silencer junction?
From memory, I believe it was a 34.9mm seatpost clamp like the one in the link below. There will be a small ridge inside that you will need to take out with a die grinder. I'll verify the size when I take the bike out of storage for the fall races. You can also measure the stinger on your silencer with a micrometer, then multiply the inch measurement by 25.4mm to get the metric size.

http://cgi.ebay.com/Seat-post-clamp-34-9mm-Black-seatpost-clamp-550-003-/370369634317?pt=Cycling_Parts_Accessories

casedit
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casedit 8/17/2010 11:34am
8/17/2010 11:34am
great thanks - i'm going to give the stock silencer a chance until it begs for mercy
CamP
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CamP 8/17/2010 11:51am
8/17/2010 11:51am
casedit wrote:
great thanks - i'm going to give the stock silencer a chance until it begs for mercy
The stock silencer is better than any aftermarket option. It's longer, which provides the over-rev that the engine was designed around. Shorter silencers trade off top end for bottom.
casedit
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casedit 9/12/2010 3:27pm
9/12/2010 3:27pm
Here's some pics of my restoration...it's only been 2yrs now in the making now as i only have a few hrs a week to devote to it but now that it's getting close i'm making more time. I'm going to need a new rear wheel as the hub worn and there is play in the bearings because of it..other than that i'm down to the plastics and cosmetics left
Wandell
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Wandell 9/12/2010 8:01pm
9/12/2010 8:01pm
Nice! Man, I wish I still had my 83.
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Wandell 9/12/2010 8:01pm
9/12/2010 8:01pm
Nice! Man, I wish I still had my 83.
CamP
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CamP 9/12/2010 8:15pm
9/12/2010 8:15pm
The bike looks great! I'm putting a new tire on the '83 next week so I should be able to get you some pics of the rear axle/spacers if you still need them.
casedit
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casedit 9/13/2010 6:04am
9/13/2010 6:04am
Thanks...

Hey Cam... thanks to a lot of your help I think i've got it correct, but if you have a camera handy when you do the tire might be a good confirmation thanks.

casedit
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casedit 10/7/2010 8:03am
10/7/2010 8:03am
Hey Cam - did you ever do that tire swap on your 83?
CamP
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CamP 10/7/2010 9:30am
10/7/2010 9:30am
casedit wrote:
Hey Cam - did you ever do that tire swap on your 83?
Not yet , but I did get up in the attic and found that rear wheel. It's dirty but it looks good. I'll clean it up and take some pics. I hope to have time to work on the 83 this weekend.
casedit
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casedit 10/7/2010 9:39am
10/7/2010 9:39am
Any pics if you could would help me confirm, thanks!

On the wheel - I meant to tell you, I actually scored one for $10 bucks (+$25 shipping) on ebay late last week...in decent condition.. score!! They normally go much higher. but thanks for looking for me..much apprec
CamP
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CamP 10/7/2010 9:54am
10/7/2010 9:54am
casedit wrote:
Any pics if you could would help me confirm, thanks! On the wheel - I meant to tell you, I actually scored one for $10 bucks...
Any pics if you could would help me confirm, thanks!

On the wheel - I meant to tell you, I actually scored one for $10 bucks (+$25 shipping) on ebay late last week...in decent condition.. score!! They normally go much higher. but thanks for looking for me..much apprec
That is a score!
captmoto
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captmoto 10/7/2010 10:49am
10/7/2010 10:49am Edited Date/Time 10/7/2010 10:50am
CamP are you running a DLS on your bike and are the hubs the same as the SLS? I'm getting ready to upgrade a 79 RM250 to 43mm forks and DLS.

Steve

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CamP
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CamP 10/7/2010 11:20am
10/7/2010 11:20am Edited Date/Time 10/7/2010 11:21am
captmoto wrote:
CamP are you running a DLS on your bike and are the hubs the same as the SLS? I'm getting ready to upgrade a 79 RM250...
CamP are you running a DLS on your bike and are the hubs the same as the SLS? I'm getting ready to upgrade a 79 RM250 to 43mm forks and DLS.

Steve
Yes, I'm running a complete front end, with the DLS brake, from a '84 RM250. The hub is smaller than the earlier SLS brakes so you won't be able to reuse any of your 79 front end parts if you want to upgrade to the DLS.



I think I recall reading that you can install the 43mm triple clamps on the 79/80 RM frame if you use your old steering stem.
captmoto
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captmoto 10/7/2010 2:28pm
10/7/2010 2:28pm
I got info on the stem. My forks are from an 82, so I need a later wheel then? 84? Will the 82 axle work?
Steve
CamP
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CamP 10/7/2010 10:12pm
10/7/2010 10:12pm
captmoto wrote:
I got info on the stem. My forks are from an 82, so I need a later wheel then? 84? Will the 82 axle work?
Steve
Are they '82 RM465 forks? They are the only '82 forks/wheel that will accept the DLS brake.
captmoto
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captmoto 10/8/2010 2:13pm
10/8/2010 2:13pm
Yes they are, at least thats how they were listed on Ebay. I think the 82 250 still had the 38mm forks. Will any DLS wheel work do I have to be exacct on a wheel?
CamP
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CamP 10/8/2010 3:00pm
10/8/2010 3:00pm
captmoto wrote:
Yes they are, at least thats how they were listed on Ebay. I think the 82 250 still had the 38mm forks. Will any DLS wheel...
Yes they are, at least thats how they were listed on Ebay. I think the 82 250 still had the 38mm forks. Will any DLS wheel work do I have to be exacct on a wheel?
Actually, come to think of it, I don't think any RM's got the DLS until 83. You'll need a 83-84 wheel and brake, but I don't know if the DLS backing plate will work with the 82 465 fork leg. I know the lug is in a different location on the 38mm forks so the DLS won't work with them.
barkhard696
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barkhard696 10/8/2010 4:01pm
10/8/2010 4:01pm Edited Date/Time 10/8/2010 4:02pm
Hey Cam, this is off-topic, but any idea where I can source some of the .010" aluminum sheet you recommended as a spacer? I want to do the later model fork swap to my 01 500 and my 96 250; I've mocked it up on the 93 and it does make a difference (sorry for the post hi-jack).

I'm getting my 86 CR250, 81 RM250, 82 RM250 (the one with the Simons UDX) and 96 RMX250 down from MI tomorrow. I'm stoked!

We found a original PC aluminum s/f for the 86 and mounted it up, the bike is just beautiful. I'll try to get some pics soon... SUPER excited to be getting my bikes back from
captmoto
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captmoto 10/8/2010 4:55pm
10/8/2010 4:55pm
captmoto wrote:
Yes they are, at least thats how they were listed on Ebay. I think the 82 250 still had the 38mm forks. Will any DLS wheel...
Yes they are, at least thats how they were listed on Ebay. I think the 82 250 still had the 38mm forks. Will any DLS wheel work do I have to be exacct on a wheel?
CamP wrote:
Actually, come to think of it, I don't think any RM's got the DLS until 83. You'll need a 83-84 wheel and brake, but I don't...
Actually, come to think of it, I don't think any RM's got the DLS until 83. You'll need a 83-84 wheel and brake, but I don't know if the DLS backing plate will work with the 82 465 fork leg. I know the lug is in a different location on the 38mm forks so the DLS won't work with them.
Man, I hope I didn't jump the gun on these forks.
CamP
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CamP 10/8/2010 5:33pm
10/8/2010 5:33pm Edited Date/Time 10/8/2010 5:35pm
barkhard696 wrote:
Hey Cam, this is off-topic, but any idea where I can source some of the .010" aluminum sheet you recommended as a spacer? I want to...
Hey Cam, this is off-topic, but any idea where I can source some of the .010" aluminum sheet you recommended as a spacer? I want to do the later model fork swap to my 01 500 and my 96 250; I've mocked it up on the 93 and it does make a difference (sorry for the post hi-jack).

I'm getting my 86 CR250, 81 RM250, 82 RM250 (the one with the Simons UDX) and 96 RMX250 down from MI tomorrow. I'm stoked!

We found a original PC aluminum s/f for the 86 and mounted it up, the bike is just beautiful. I'll try to get some pics soon... SUPER excited to be getting my bikes back from
Some hobby shops have it. You can get it online HERE



You can also use a double layer of beer can. They are .005" thick.

Congrats on getting your bikes back. Like Christmas in October!
CamP
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CamP 10/8/2010 5:50pm
10/8/2010 5:50pm Edited Date/Time 10/8/2010 6:05pm
barkhard696 wrote:
Hey Cam, this is off-topic, but any idea where I can source some of the .010" aluminum sheet you recommended as a spacer? I want to...
Hey Cam, this is off-topic, but any idea where I can source some of the .010" aluminum sheet you recommended as a spacer? I want to do the later model fork swap to my 01 500 and my 96 250; I've mocked it up on the 93 and it does make a difference (sorry for the post hi-jack).

I'm getting my 86 CR250, 81 RM250, 82 RM250 (the one with the Simons UDX) and 96 RMX250 down from MI tomorrow. I'm stoked!

We found a original PC aluminum s/f for the 86 and mounted it up, the bike is just beautiful. I'll try to get some pics soon... SUPER excited to be getting my bikes back from
BTW, I raced the 95 CR for the first time last weekend in the TVRC's Decade class. That old bike is fast. Pulled holeshots on a couple of late model YZ450's that snuck into the class. The CRF450 forks worked great. all I did was reduce the outer chamber oil volume to 375cc. The 95 shock was too soft, even with the 5.6kg rear spring, so I had to run the compression adjuster all the way in. Revalved it yesterday by adding three 40 x .20 shims to the low speed compression stack. Hopefully that'll balance it out.



CamP
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CamP 10/8/2010 6:03pm
10/8/2010 6:03pm
captmoto wrote:
Yes they are, at least thats how they were listed on Ebay. I think the 82 250 still had the 38mm forks. Will any DLS wheel...
Yes they are, at least thats how they were listed on Ebay. I think the 82 250 still had the 38mm forks. Will any DLS wheel work do I have to be exacct on a wheel?
CamP wrote:
Actually, come to think of it, I don't think any RM's got the DLS until 83. You'll need a 83-84 wheel and brake, but I don't...
Actually, come to think of it, I don't think any RM's got the DLS until 83. You'll need a 83-84 wheel and brake, but I don't know if the DLS backing plate will work with the 82 465 fork leg. I know the lug is in a different location on the 38mm forks so the DLS won't work with them.
captmoto wrote:
Man, I hope I didn't jump the gun on these forks.
Take a pic of your left fork leg brake boss and I'll be able to tell you if the DLS brake will work.
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captmoto 10/8/2010 6:30pm
10/8/2010 6:30pm
OK, thanks
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captmoto 10/9/2010 5:41pm
10/9/2010 5:41pm
Cam, this is what I got for my 79 RM
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