1979 Mugen air cooled ME125RZ Restoration

Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
10/22/2025 3:43am
9302874B-2CDB-438A-B26E-88E20C73D12A
7
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
10/27/2025 9:21am Edited Date/Time 10/27/2025 9:22am

So I found a aftermarket Mugen cone pipe and silencer. I ended up buying them thinking about using them on my project? Not quite sure yet? Can’t decide if I’m going to go with these or the mugen Pipe and silencer that came with the kit?

Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
10/27/2025 10:37am
5B64342E-AF6F-4D69-B231-EAB19FAD94C3
2
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
10/27/2025 10:43am
59F12D0C-DD91-444F-9E96-2DDD878BB8D9.jpeg?VersionId=i3Lz k uWCcWPa7Y5oX.
2

The Shop

Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
10/30/2025 4:19am

The original handlebars are straightened, stripped and painted. Done and ready to go.1A84ADA3-4F29-48BA-80C4-C353D070EDBA.jpeg?VersionId= HPRVVDDO0npk60PIQ

2
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
10/30/2025 4:57am

79 CR 125 gas tank is stripped of paint and ready for repairs and primer and a new paint job next week.

1
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
10/30/2025 4:59am
E5D10647-40D6-4A30-B4FC-ED1551C84C1F
2
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
10/30/2025 5:01am
50ECDB1E-926C-4A44-920A-15F1D26F9FCF.jpeg?VersionId=nGrmUEWgitVuVzFLXM9.Lh
2
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
10/30/2025 5:02am
6A930A8C-73CC-40FF-8B01-B0FCE8B7B1C3
2
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
10/30/2025 5:05am

You never know what you’ll find when you strip gas tanks of their paint. Like all these grinder marks on this tank. I will have my hands full repairing this.

2
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
10/30/2025 5:24am
E3A64F1B-3B44-4F0D-9516-58D448C4CBBA
1
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
10/30/2025 5:47am

Fox Air Shox and Simmons forks are disassembled and ready for refurbishing and rebuild. Will be installing all new seals.

1
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
10/30/2025 5:48am
899E9222-DDA2-4DA3-BE32-38F025613659
2
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
10/31/2025 4:12am

So I went ahead and splurged and spent the money and had a company called KLP racing manufacture me a perfect copy of a 79RC 125 swingarm. I just received a swingarm. And I am extremely happy with it. It is a work of art. I will be using this on the Mugen build. Because these swingarms did come on the 79 Mugen‘s. KOP can manufacture copies of almost any swingarm out there. So if you have a swingarm that you need  to have it made contact klpracing.com.

 

2
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
10/31/2025 4:19am
185D3273-71CD-4FF8-9E7E-734F56414416
9
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
10/31/2025 4:19am
9C3AA01A-4B5F-45F7-8130-144CFAA4BCA3
2
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
10/31/2025 4:21am
A95A9990-D538-4740-BED3-F8F82C07875E
2
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
10/31/2025 4:22am
0D993808-B492-4A95-B6E2-922CFA9F734E
4
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
10/31/2025 5:50am
a14eb277d2d36661 %281%29
1
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
10/31/2025 6:10am

It is the same swingarm that is on this bike.

2
JMCR250
Posts
444
Joined
8/26/2018
Location
Chesterfield, MO, USA
11/1/2025 9:18am

Beautiful work.  New bikes are cool, but those late 70s and 80s works bike are pure eye candy.

Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
11/3/2025 9:00am

The gas tank is primed and ready for paint.,, I will be painting it this week.

1
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
11/3/2025 9:04am
1A3A8EA2-D2E4-46B5-BC38-9685F965198649F902C1-B207-499F-980F-3D2845E94F87
3
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
11/4/2025 4:18am

The engine disassembly has begun. The engine will be completely disassembled sandblasted vapor, honed, repainted, and original red color. All new bearings and seals and gaskets installed on reassembly.

2
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
11/4/2025 4:23am
5E2807B7-F3F0-46C6-9F02-B37EFB0F592C.jpeg?VersionId=gF4I9
3
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
11/5/2025 4:11am
39B81430-99D1-4DEF-B9B8-533511AFB857.jpeg?VersionId=2KTIH5k4BdJzbGW4h04zndJDj4q
2
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
11/5/2025 4:15am
07CA7BD5-9E65-4438-83F0-D613A01CD521
2
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
11/5/2025 4:19am
E0472861-3740-41AA-ADD2-D642C94FE3B9.jpeg?VersionId=IK1gG03yR1ch
Bluelion
Posts
1322
Joined
9/10/2013
Location
Lafayette, IN, USA
11/5/2025 4:40am

Everything inside the engine looks good except for the crank. The crank is no good and will need replaced. Looks like I’ll have to disassemble my donor engine. To get the necessary parts. Need to rebuild the Mugen engine.43AC8517-6CB4-4E67-93DD-7A96BD2E329E.jpeg?VersionId=Gl3YRfdLGYp

1

Post a reply to: 1979 Mugen air cooled ME125RZ Restoration

The Latest