1977 Mugen 125 # 12 Steve Wise replica build

Bluelion
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Lafayette, IN, USA
9/15/2026 9:50am
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5
RDnutz
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9/15/2026 12:53pm Edited Date/Time 9/15/2026 12:54pm
Bluelion wrote:
Front and rear suspension is installed. And test fitting the gas tank. The bike is actually starting to look somewhat like a motorcycle.

Front and rear suspension is installed. And test fitting the gas tank. The bike is actually starting to look somewhat like a motorcycle.
C0F37AFD-4A35-44D9-B195-A297A0FC8A92.jpeg?VersionId=mPSSQBro6Jxf

are those Vintco copies of the original Fox air shocks?

Bearuno
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AU
9/15/2026 10:23pm Edited Date/Time 9/16/2026 4:08am

Bluelion : Why the 1" for the top nut?

Were the Simons made with Imperial sizings, or, a mixture of that and metric?

 I know they were called 38s, or were they actually 38.1mm  (1.5") OD?

Closest I ever got to them was unpacking a couple of Aberg Repica kits the company I worked for in the late 70s / early 80s brought in.

My Fox 44s, were  /are Metric, though I think some internal parts / dimensions ( as still, so many things will use, which can be a surprise / problem at times) . I think the 'special tool', to undo the bottom damper rod caps, was / is nothing but an imperial sized bit of square tubing - I can't get to the 44s to confirm (but I welded 2 Allen keys to it for an easy to use tool for  them the second I got the 44s)  as they hang behind my lathe, out of my 'limited' reach.

Oh, and that curved lower rear engine mount tube - was that  originally to accommodate a down pipe, in the model lines history? 

 

1
Bluelion
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9/16/2026 3:14am
Bluelion wrote:
Front and rear suspension is installed. And test fitting the gas tank. The bike is actually starting to look somewhat like a motorcycle.

Front and rear suspension is installed. And test fitting the gas tank. The bike is actually starting to look somewhat like a motorcycle.
C0F37AFD-4A35-44D9-B195-A297A0FC8A92.jpeg?VersionId=mPSSQBro6Jxf

RDnutz wrote:

are those Vintco copies of the original Fox air shocks?

Yes

The Shop

Bluelion
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Lafayette, IN, USA
9/16/2026 3:19am
Bearuno wrote:
Bluelion : Why the 1" for the top nut?Were the Simons made with Imperial sizings, or, a mixture of that and metric? I know they were called...

Bluelion : Why the 1" for the top nut?

Were the Simons made with Imperial sizings, or, a mixture of that and metric?

 I know they were called 38s, or were they actually 38.1mm  (1.5") OD?

Closest I ever got to them was unpacking a couple of Aberg Repica kits the company I worked for in the late 70s / early 80s brought in.

My Fox 44s, were  /are Metric, though I think some internal parts / dimensions ( as still, so many things will use, which can be a surprise / problem at times) . I think the 'special tool', to undo the bottom damper rod caps, was / is nothing but an imperial sized bit of square tubing - I can't get to the 44s to confirm (but I welded 2 Allen keys to it for an easy to use tool for  them the second I got the 44s)  as they hang behind my lathe, out of my 'limited' reach.

Oh, and that curved lower rear engine mount tube - was that  originally to accommodate a down pipe, in the model lines history? 

 

Yes, The Simons forks were made with American standards.

1
Bluelion
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9/17/2026 9:39am

Now to build the wheels.

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4
Bluelion
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Lafayette, IN, USA
9/21/2026 5:21am

I have the wheels completely taken apart. The hubs are ready for sandblasting.
E1254EF5-3483-4CD3-BE01-D81939673176EC6F385E-BF9B-454F-8043-4BF94C5978E7.jpeg?VersionId=NI122z9u93ole

1
Bluelion
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9/21/2026 5:22am
03B92677-9EDF-4A0C-8B55-3E4D07566DE2
The handlebars finally arrived. Got them installed.
2
Bluelion
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9/21/2026 5:24am

Starting to install the plastic front and rear fenders permanently installed the side panels just test fit. The front number plate is also a test fit.

 

1
Bluelion
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9/21/2026 8:06am
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6
Bluelion
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9/30/2026 5:44am

The hubs, break plates, and miscellaneous small items are sandblasted, primed, and painted.

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2
Bluelion
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9/30/2026 5:48am

Time to lace up the wheels tonight. Still waiting on new tires to get here.
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4
redman
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east coast, MD, USA
10/1/2026 8:02am

What spoke sets are you using for the build?

Bluelion
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10/1/2026 3:25pm
redman wrote:

What spoke sets are you using for the build?

I’m using spoke sets from Vintage Avenue. I like them. They seem to be a very well-made. Spoke that fit properly.

Bluelion
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10/1/2026 3:26pm

The wheels are laced up and Trude. Ready for tires.
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6
Bluelion
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10/1/2026 3:27pm

I’ve got a lot of the small parts laid out ready to install onto the bike.
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6
Bluelion
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14 hours ago

I was able to get the controls on, clutch lever, brake lever, Throttle, kill switch and the grips.
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2
Bluelion
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14 hours ago

The brakes are done and ready to go. The wheels are done and ready for tires.
2C5A9A8F-83A9-4B7E-9213-55EA477259822F39373B-CF0D-443F-8B3A-7B84FC8847EC

2
RDnutz
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13 hours ago
Bluelion wrote:
The brakes are done and ready to go. The wheels are done and ready for tires.

The brakes are done and ready to go. The wheels are done and ready for tires.
2C5A9A8F-83A9-4B7E-9213-55EA477259822F39373B-CF0D-443F-8B3A-7B84FC8847EC

that's gonna be too purdy to get dirty riding when it's done.

Bluelion
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10 hours ago Edited Date/Time 10 hours ago
Bluelion wrote:
The brakes are done and ready to go. The wheels are done and ready for tires.

The brakes are done and ready to go. The wheels are done and ready for tires.
2C5A9A8F-83A9-4B7E-9213-55EA477259822F39373B-CF0D-443F-8B3A-7B84FC8847EC

RDnutz wrote:

that's gonna be too purdy to get dirty riding when it's done.

Brand New dirt bikes are always too pretty to go out and get them dirty but we all do it.

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