1981 Mugen CR250 Engine Help

RGVSP
Profile picture for user RGVSP
Posts
9
Joined
6/20/2012
Location
Powder Springs, GA, USA
RGVSP

I took a flyer on  81 CR250 engine with a Mugen top end.  It looks pretty good inside but I have a few questions.

 

1.  Did they use a "Mugen" piston or were they just standard Honda pistons.  I see one for sale in a Mugen box.

2.  The ignition has MR2366 on it.  Is that a Mugen Racing part or just a standard Honda part?

Any info would be greatly appreciated!IMG 7684 0IMG 7688 0IMG 7689 0IMG 7690.jpg?VersionId=5XJUjUNoFh.8s8nq6IMG 7691 0IMG 7693 0.jpg?VersionId=ndZL4IzuIMG 7694

|
RednBlue
Profile picture for user RednBlue
Posts
65
Joined
8/1/2021
Location
Lafayette, IN, USA
RednBlue 10/11/2025 6:37am
10/11/2025 6:37am

You might consider checking out the Mugen thread in the Old School Moto forum to see if someone there can help.

Blue Lion on this site appears to have a lot of experience with Mugens.

 

RGVSP
Profile picture for user RGVSP
Posts
9
Joined
6/20/2012
Location
Powder Springs, GA, USA
RGVSP 10/11/2025 11:16am
10/11/2025 11:16am

I appreciate the tip!

 

JMCR250
Profile picture for user JMCR250
Posts
439
Joined
8/26/2018
Location
Chesterfield, MO, USA
JMCR250 10/14/2025 10:31am
10/14/2025 10:31am

The piston looks like OEM Honda (I have an '82 CR250), but you'd likely need to take some measurements to confirm.

Post a reply to: 1981 Mugen CR250 Engine Help