Board index All Things Vintage 1983 CR 250 Build Thread

1983 CR 250 Build Thread

A place to relive, revive, and ride that "old iron".

Post Sat Nov 25, 2017 8:04 pm

Posts: 1284
Location: Amherst, NH
This will be a slow build, but hopefully a fun one. The plan is an EVO class bike for next year that I got from Tom Erdmann - I had an '83 CR 250 BITD & from what I recall (That was a while ago, so details are fuzzy), it was a decent woods bike.

The saga begins & Split the motor last night:

Image

It'll need a crank rebuild (lower rod bearing might have been why the bike was parked - it was very spent), main bearings + seals and all new bearings in the transmission. The cylinder had a Wiseco piston that is 1.5 mm over, but the cylinder bore is in decent shape, so I plan to run a hone thru it & install new piston/rings.

Right side crankcase was "broken & repaired" but just sourced a nice replacement off eBay.

There were no electrics with the bike, so that's on the search list.

Needs all plastics, seat cover, and much more !
Steve

MVTR

Post Sat Nov 25, 2017 8:14 pm

Posts: 1284
Location: Amherst, NH
What I started with:

Image
Steve

MVTR

Post Sat Nov 25, 2017 11:27 pm

Posts: 1505
Wow.
Hope you got it cheap.... cuz it's about to get spendy

Should be a cool bike when done

Post Sun Nov 26, 2017 1:04 am

Posts: 1284
Location: Amherst, NH
Got it for free. But yeah It'll get spendy. First item I purchased was an '81 CR 250 clutch cover (Aluminum) for $350 :omg:

JackPiner wrote:
Wow.
Hope you got it cheap.... cuz it's about to get spendy

Should be a cool bike when done
Steve

MVTR

Post Sun Nov 26, 2017 7:57 am

Posts: 923
sjsst41 wrote:
Got it for free. But yeah It'll get spendy. First item I purchased was an '81 CR 250 clutch cover (Aluminum) for $350 :omg:

JackPiner wrote:
Wow.
Hope you got it cheap.... cuz it's about to get spendy

Should be a cool bike when done



Oooch! That's not a good start... :sorry

Hope you prove me wrong but most of the time a $1500 old bike is cheaper than a free one...

Post Sun Nov 26, 2017 10:17 am

Posts: 1284
Location: Amherst, NH
Lol - I cannot prove you're wrong - as I'm certain you are right.

But in this case resurrecting a bike (that has some nostalgia factor) is part of the fun - then getting it on the track and racing it is "icing on the cake"

I like to build projects on a budget, rather than just pulling out the checkbook, but I don't mind spending a few $ to make it go.

oldschool wrote:
sjsst41 wrote:
Got it for free. But yeah It'll get spendy. First item I purchased was an '81 CR 250 clutch cover (Aluminum) for $350 :omg:

JackPiner wrote:
Wow.
Hope you got it cheap.... cuz it's about to get spendy

Should be a cool bike when done



Oooch! That's not a good start... :sorry

Hope you prove me wrong but most of the time a $1500 old bike is cheaper than a free one...
Steve

MVTR

Post Mon Nov 27, 2017 6:05 pm

Posts: 114
[quote="sjsst41"]But in this case resurrecting a bike (that has some nostalgia factor) is part of the fun - then getting it on the track and racing it is "icing on the cake"

I like to build projects on a budget, rather than just pulling out the checkbook, but I don't mind spending a few $ to make it go.

[quote]

Looks like a fun project. I can not agree with you more. To me there is nothing like saving a bike that was headed to the scrap or part out pile. BTW, I wish my YZ was as complete as your CR.
Richard
At some point in life, everyone has gambled on a fart and lost.

Post Tue Nov 28, 2017 12:16 pm

Posts: 383
Dale (disonny) told me the most expensive bike you will ever own is the one you got for free. Truer words couldn't be said. Below is a before and after pic of the 73 Husky I had given to me. I pour money in to this bike on a regular basis. If I had to pay someone by the hour for how many hours are in this thing, it would be thousands and thousands of dollars.
But I learned a ton and I love the bike.
Good luck Steve. Looking forward to seeing your progress throughout the winter.
Attachments
Husky2501.jpg
Husky.jpg

Post Wed Nov 29, 2017 10:18 pm

Posts: 1284
Location: Amherst, NH
That bike looks awesome Gord ! This one will not be as aesthetically appealing, the plan is to focus on reliability as I want to race this bike & it'll see some hard track time.
Steve

MVTR

Post Fri Dec 01, 2017 1:22 pm

Posts: 1284
Location: Amherst, NH
Oh well - the "nice replacement" case was just delivered & has a broken clutch rod boss - couldn't make it out on the pics that the eBay seller posted, so working on a refund and returning the part, since its junk. The search begins for a replacement. :(
Steve

MVTR

Post Fri Dec 01, 2017 2:03 pm

Posts: 1208
sjsst41 wrote:
Oh well - the "nice replacement" case was just delivered & has a broken clutch rod boss - couldn't make it out on the pics that the eBay seller posted, so working on a refund and returning the part, since its junk. The search begins for a replacement. :(


You need cases.. One won't work, Honda machined them as a set. 82-83 cases are the same. 81 cases will work but you need an 81 crank (FYI I gave a 81 crank to Nate) as the width between the lobes is different.

Good luck!
Tom A.
SRCR President
Vintage Series Racer
1977 MX3, 1977 RM 175, 1980 CR250R, 1981 PE250, 1988 Cagiva WMX, 90 CRM250, 98 YZ250

Post Fri Dec 01, 2017 3:13 pm

Posts: 1284
Location: Amherst, NH
Really? They machined them as a set? Any idea what datum they were trying to maintain by performing that operation?

Shoot.

450exc115 wrote:
sjsst41 wrote:
Oh well - the "nice replacement" case was just delivered & has a broken clutch rod boss - couldn't make it out on the pics that the eBay seller posted, so working on a refund and returning the part, since its junk. The search begins for a replacement. :(


You need cases.. One won't work, Honda machined them as a set. 82-83 cases are the same. 81 cases will work but you need an 81 crank (FYI I gave a 81 crank to Nate) as the width between the lobes is different.

Good luck!
Steve

MVTR

Post Fri Dec 01, 2017 3:22 pm

Posts: 1208
sjsst41 wrote:
Really? They machined them as a set? Any idea what datum they were trying to maintain by performing that operation?

Shoot.




Crank and transmission centerlines
Tom A.
SRCR President
Vintage Series Racer
1977 MX3, 1977 RM 175, 1980 CR250R, 1981 PE250, 1988 Cagiva WMX, 90 CRM250, 98 YZ250

Post Fri Dec 01, 2017 8:24 pm

Posts: 1284
Location: Amherst, NH
Thanks Tom - now on the hunt for a pair off cases - seems to be some options on eBay.
Steve

MVTR

Post Sat Dec 02, 2017 5:57 am

Posts: 683

Post Sat Dec 02, 2017 12:12 pm

Posts: 1284
Location: Amherst, NH
Lol - that's the guy I bought the broken case from - He hasn't returned any correspondence I sent yet.

FATDADRACING wrote:
https://www.ebay.com/itm/1983-Honda-CR250R-CR250-BOTTOM-END-LOWER-HALF-CASES-TOGETHER-see-description/132085033993?fits=Year%3A1983%7CModel%3ACR250R&hash=item1ec0e1ac09:g:o7QAAOSwNnRYlNOj&vxp=mtr

Pricey but looks somewhat complete


I did see a nice set of '82 CR 250 cases on there - might pull the trigger on those since it sounds like they are comparable.
Steve

MVTR

Post Sat Mar 03, 2018 1:47 pm

Posts: 1284
Location: Amherst, NH
So just pulled the trigger on a set of matched cases on EBay. Really like the “make an offer” button & my offer gets accepted :biggrin

On the short list of parts to get the motor in one piece:

1. Crank bearings and seals
2. Connecting ride kit
3. Piston & Ring kit
4. Complete motor gasket kit
5. I believe I need water pump parts? (impeller/shaft/bearings/seals)
6. Clutch basket
7. Various bearings and seals

I also have 0 electrical parts for this bike, so I’ll need to source those.
Steve

MVTR

Post Sat Mar 03, 2018 1:49 pm

Posts: 1284
Location: Amherst, NH
And a pic (that I posted in the 2018 race bike thread). Need bars, controls, a seat cover, etc, etc

Image
Steve

MVTR

Post Tue Mar 06, 2018 9:06 pm

Posts: 1284
Location: Amherst, NH
New (used) replacement engine cases delivered today - first pass inspection and they look really good :biggrin

Now I’ll order a connecting rod kit & main bearings :spite
Steve

MVTR

Post Wed Mar 07, 2018 9:01 pm

Posts: 1284
Location: Amherst, NH
Question for the vintage crew: Is it better to paint the cases before motor assembly, or after it’s all together ?

Thinking it might be better to paint the pieces, then touch up as needed after assembly.
Steve

MVTR

Post Wed Mar 07, 2018 11:18 pm

Posts: 1208
I've done it both ways. Doing it before you assemble it looks cleaner as long as you take your time masking and prepping them. If it ain't a show queen you can do when more is assembled.
Tom A.
SRCR President
Vintage Series Racer
1977 MX3, 1977 RM 175, 1980 CR250R, 1981 PE250, 1988 Cagiva WMX, 90 CRM250, 98 YZ250

Post Thu Mar 08, 2018 12:11 pm

Posts: 1284
Location: Amherst, NH
Thank you Tom.

Also I recall you mentioning since I’m going to run an ‘81 aluminum clutch cover with integral water pump, there was some exhaust pipe interference or clearance issues? What were the specifics?
Steve

MVTR

Post Thu Mar 08, 2018 7:38 pm

Posts: 1284
Location: Amherst, NH
Going to save a ton of money by reusing that chain that came with. That and I may have to switch to Geico for my car insurance.

JackPiner wrote:
Wow.
Hope you got it cheap.... cuz it's about to get spendy

Should be a cool bike when done
Steve

MVTR

Post Fri Mar 09, 2018 1:34 am

Posts: 1208
sjsst41 wrote:
Thank you Tom.

Also I recall you mentioning since I’m going to run an ‘81 aluminum clutch cover with integral water pump, there was some exhaust pipe interference or clearance issues? What were the specifics?


You will have to dent the pipe to clear the water pump out put. I've also seen people weld on a fitting that is at the proper angle.
Tom A.
SRCR President
Vintage Series Racer
1977 MX3, 1977 RM 175, 1980 CR250R, 1981 PE250, 1988 Cagiva WMX, 90 CRM250, 98 YZ250

Post Fri Mar 09, 2018 10:36 am
jsc
C Class Poster

Posts: 165
sjsst41 wrote:
Going to save a ton of money by reusing that chain that came with. That and I may have to switch to Geico for my car insurance.

JackPiner wrote:
Wow.
Hope you got it cheap.... cuz it's about to get spendy

Should be a cool bike when done

you can't buy a chain with that patina, only mother nature can make it. people pay good money for patina

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