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Author Topic: 1978 C2 RM250 Project  (Read 7523 times)

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Offline riffraff

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1978 C2 RM250 Project
« Reply #15 on: April 10, 2013, 05:35:38 AM »
Grind the socket so that it fits
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline cnrcpla

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1978 C2 RM250 Project
« Reply #16 on: April 10, 2013, 02:16:11 PM »
Yeah sacrifice a socket and grind it down to fit
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Lolerbabop

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1978 C2 RM250 Project
« Reply #17 on: April 10, 2013, 02:24:38 PM »
Well, they most likely had some special tool when they put it together in the factory. Make your own/modify a socket or something?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Coop

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1978 C2 RM250 Project
« Reply #18 on: April 10, 2013, 06:23:05 PM »
You either have to grind an old socket or buy some thin walled sockets. They are pricey usually though.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Liamthedevastator

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1978 C2 RM250 Project
« Reply #19 on: April 17, 2013, 12:12:01 AM »
Alrighty, working on getting a socket ground down to get that stupid butthead of a bolt outta there, in the mean time I have a question about my crank.

When I pulled it from the case it was rusted, so almost a given to have it rebuilt. WELL. I metal rescued the crap out of it (not be all end all I thought it was; left a lot of black oxide on the surfaces that I'm trying to get off) and it spins free now. What I'm wondering is if it's worth it to drop the exorbitant amount of money it costs to have the crank rebuilt and not have to worry about it.

I don't really have that money, but I'd be more outta luck if it goes, right? SOL as my family says

Edit: What are some other years/models of crankshafts that could potentially fit in here? If I can modify the engine to take a newer year perhaps that could be a good thing no? :<img src=" title="Roll Eyes" class="smiley">
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline TMKIWI

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1978 C2 RM250 Project
« Reply #20 on: April 17, 2013, 08:17:04 AM »
Don't muck around with a dodgy crank. Replace it.
If you use it and it lets go you will be in a world of hurt. :(
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Liamthedevastator

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1978 C2 RM250 Project
« Reply #21 on: April 21, 2013, 10:11:04 PM »
Okay, engine is fully apart! I got the exhaust flange off with some needle-nose pliers and one of those tight space nail grabbing claws. I figured that it would be loose considering how shotty everything was put together already from the PO.

My delema now is the crankshaft. It is quickly becoming a deal breaker for me. I haven't found any companies in my area that can rebuild it and having a hard time finding a brand new one. The cost is going to be more than I can get back if I go any further, so I'm almost at a point where I have to sell the bike to get my money back and try a 2 stroke resto another time.

Any suggestions, opinions, recommendations for how to deal with the crank?

Thanks guys!

p.s. I ground down a socket but it didn't fit, so now I have a fancy socket :P
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline TMKIWI

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1978 C2 RM250 Project
« Reply #22 on: April 22, 2013, 08:11:39 AM »
If you are doing this with the thought of making money , stop now.
Most older bikes will cost more then they are worth to do up. ( There are some bargins yes ).
If you are doing it for the fun of it and to learn , fix the crank and get the old girl going.
There is a certain joy to be had at the end of the job when you sit back and admire your handy work.
Knowing YOU turned a turd into a diamond. ;D
It's the reason people restore old things.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline SachsGS

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1978 C2 RM250 Project
« Reply #23 on: April 22, 2013, 03:58:05 PM »
Rebuild the crankshaft. The rod assembly should be easy and cheap enough to find and just about any machine shop should be able to press apart the crank.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Liamthedevastator

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1978 C2 RM250 Project
« Reply #24 on: April 24, 2013, 06:23:31 AM »
DEFINITELY not in it to make money! I love restoring so far because of the chance to make something that others wouldn't even attempt. The only problem is that it's getting to be taxing on my wallet, which is to be expected I suppose!

Okay, so assuming I move forward with the crank rebuild; anything I should keep an eye out for before I hash out a quote on this whole deal?

Man, you guys rock.

Returning all the things I bought from DC Plastics... nothing fit :(
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline TMKIWI

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1978 C2 RM250 Project
« Reply #25 on: April 24, 2013, 06:37:47 AM »
Quote from: Liamthedevastator on April 24, 2013, 01:23:31 PM
Returning all the things I bought from DC Plastics... nothing fit :(

 :o Hope they sort you out.
What happened ?, wrong model parts or just wrongly made.?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline evo550

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1978 C2 RM250 Project
« Reply #26 on: April 24, 2013, 06:58:30 AM »
Quote from: TMKIWI on April 24, 2013, 01:37:47 PM
Quote from: Liamthedevastator on April 24, 2013, 01:23:31 PM
Returning all the things I bought from DC Plastics... nothing fit :(

 :o Hope they sort you out.
What happened ?, wrong model parts or just wrongly made.?

DC plastics and I have a love/hate relationship, their quality is poor and price is high, but when you have no other option.....
You would be better off trying to restore second hand genuine stuff.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Liamthedevastator

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1978 C2 RM250 Project
« Reply #27 on: March 04, 2013, 06:54:55 PM »
I hope so too! It wasn't anything that they make. Rather it was a couple things that aren't fitting what I BELIEVE is a 1978 rm 250. The reeds were 2 pronged whereas my intake was 3 prong, and the Boyesen site pointed me towards a 3 prong reed too so I don't think I have the wrong engine. How can I ID this thing? I have a few different numbers.

1S zz-392

RM250 46390

Not sure what either of those are, straight from the case though.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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