1988 CR125 build

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11/20/2018 11:37 PM

I picked up this little thing the other day and am hopeful it won't break the bank. It runs strong and I'm pretty excited to get to work.
Pros: a lot of original parts with a fresh motor and clutch.
Cons: stripped gas tank nut inserts and a bullshit fix going into the water pump that I have to make right. If anyone has a right side case for the water pump fix I would appreciate it greatly! Photo
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Throwbackmxguy

11/21/2018 7:21 AM

Nice find...is the water pump case rotted like the that era of 250"s? I was wondering about the 125 case material being the same.....I almost bought a pretty nice 89 cr125 a few days ago but held off ...

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11/21/2018 10:44 AM

Have fun! I am building an 89 down the page.

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11/21/2018 10:58 AM

sandman768 wrote:

Nice find...is the water pump case rotted like the that era of 250"s? I was wondering about the 125 case material being the same.....I almost bought a pretty nice 89 cr125 a few days ago but held off ...

The 125’s used the same material for the cases like the 250’s. My 89 is all rotted out.

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11/21/2018 11:58 AM

Also, mine rotted as well. Not terrible but I might look into some sort of sealant during rebuild.

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11/21/2018 12:52 PM

The updated 250 waterpump case is readily availible from Honda, I just purchased one for my 89, 180.00 for the case, not too bad, I"m not sure if Honda ever reproduced an updated 125 case. Inspect all water passages for calcium/ mag build up. My radiators did not look to bad & appeared to flow good, but for precautionary measures I connected both radiators & filled with Muratic acid, let side a few hrs & then rinsed with a garden hose.....a lot of magnesium & calcium buildup washed out & they flowed much better....

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11/21/2018 1:46 PM

Some where someone found out with the 125 the right side case from 87 to 99 was the same dimensions. With i believe 90 plus being made of alloy not mag.

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11/21/2018 1:59 PM

sandman768 wrote:

Nice find...is the water pump case rotted like the that era of 250"s? I was wondering about the 125 case material being the same.....I almost bought a pretty nice 89 cr125 a few days ago but held off ...

Yes sir... the search begins. Haha

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Throwbackmxguy

11/21/2018 2:02 PM

SmokinJoe439 wrote:

Some where someone found out with the 125 the right side case from 87 to 99 was the same dimensions. With i believe 90 plus being made of alloy not mag.

I will have to look into that. Thanks man.

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Throwbackmxguy

11/21/2018 2:58 PM

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11/21/2018 3:17 PM

Thanks for the link...MXM would be proud to know one of his post is still helping others....

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11/21/2018 4:51 PM

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Throwbackmxguy

11/27/2018 8:47 PM

I'm getting the easy stuff done first for motivation. A new seat, fixed the 3 out of 4 stripped tank bolts and a couple of new plastics and decals. I have a bunch of stuff in transit and then the dirty work starts. Photo
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Throwbackmxguy

11/28/2018 10:21 PM

Pulled the motor out today.. looks like I need a new gasket for the power valve cover and a possible fix to the cylinder. Photo
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Throwbackmxguy

11/29/2018 6:33 PM

What happened to that cylinder?

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11/29/2018 7:26 PM

sandman768 wrote:

What happened to that cylinder?

No clue. It has good compression though. It scares the hell out of me though. It's a 30 year old bike and am just wondering if this is a Honda thing of yesteryear?

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Throwbackmxguy

12/2/2018 12:24 AM

SmokinJoe439 wrote:

Some where someone found out with the 125 the right side case from 87 to 99 was the same dimensions. With i believe 90 plus being made of alloy not mag.

I found one from 97 new oem. I'm just waiting on the OEM gasket. Thanks a ton man.


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Throwbackmxguy

12/14/2018 11:28 PM

More progress. I found a side case new OEM for a 1997 and it bolted right up. New inner hub for the clutch and about 100 OEM bolts to help with the fresh look. I actually like the look of the factory bare side case instead of all black... not era friendly but I can always paint it. Photo

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Throwbackmxguy

12/15/2018 5:57 AM

beautiful!

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12/15/2018 7:40 AM

bonseff wrote:

beautiful!

Thanks! Its getting there

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Throwbackmxguy

12/16/2018 5:56 AM

Looks good! I would not paint that cover either. It must have been a revelation for G.Holland to get off those Suzukis and onto the Hondas!

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12/16/2018 6:52 AM

sandman768 wrote:

Looks good! I would not paint that cover either. It must have been a revelation for G.Holland to get off those Suzukis and onto the Hondas!

Thanks man! This bike is kicking my ass though. The radiators are both shot due to the famous Honda magnesium corrosion as well. So I ordered some new ones yesterday. I've had much better luck with my Suzuki builds. Haha

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Throwbackmxguy

12/17/2018 7:11 PM

Almost there.. just a few more details Photo

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Throwbackmxguy

12/18/2018 12:09 AM
Edited Date/Time: 12/18/2018 12:10 AM

Looks great! I like the 88, you don't see many restored ones. They are quite popular at Farleigh though.

Here is my 90:

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12/18/2018 4:22 AM

Banana_oil wrote:

Looks great! I like the 88, you don't see many restored ones. They are quite popular at Farleigh though.

Here is my 90:

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Thank you. Your bike is amazing man. Nice work!

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Throwbackmxguy

12/18/2018 7:46 PM

Love it! My first full size bike was none other than a 1988 CR125. Not a common build to find but a much appreciated restore. I had the same problem with cases deteriorating & leaking requiring new right side case etc. Happened to me in 1994. Very respectable results on your project. Takes me back.

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StuntmanStew

12/19/2018 12:51 PM

Manbearpig wrote:

More progress. I found a side case new OEM for a 1997 and it bolted right up. New inner hub for the clutch and about 100 OEM bolts to help with the fresh look. I actually like the look of the factory bare side case instead of all black... not era friendly but I can always paint it. Photo

Nice work on the build! Did you end up painting the frame or powdercoat? Any issues with the cyclinder?

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12/19/2018 12:55 PM

SmokinJoe439 wrote:

Some where someone found out with the 125 the right side case from 87 to 99 was the same dimensions. With i believe 90 plus being made of alloy not mag.

Manbearpig wrote:

I found one from 97 new oem. I'm just waiting on the OEM gasket. Thanks a ton man.


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Glad I could help and that i remembered that clutch cover swap.

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12/19/2018 1:01 PM

Stuntman_600 wrote:

Love it! My first full size bike was none other than a 1988 CR125. Not a common build to find but a much appreciated restore. I had the same problem with cases deteriorating & leaking requiring new right side case etc. Happened to me in 1994. Very respectable results on your project. Takes me back.

Thank you very much. I saw the old bike locally and thought the same thing about not being a common restore... now I know why. Haha. Cost more than I was hoping but I'm pretty excited now.

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Throwbackmxguy

12/19/2018 1:03 PM

Updated pics. Waiting on radiators still and a PC pipe Photo
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Throwbackmxguy