Hi Guys - Newbie - Engine ID request

zenriddles

New Member
I don't remember what this critter is anymore. I have had it for over 30 years after a truly epic wipeout by a buddy of mine.
As I recall, it was a 'small wheel' bike. Broke the forks off - bike was trashed. I saved the drivetrain for a future project with my son that never happened.

Fast forward to the twenty-first century. What is it? Complete carb to tailpipe all original.
 

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zenriddles

New Member
Well, I'll be darned - There it is !

Next question - Is this motor worth anything to anybody?
 

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  • 1966-Honda-CM91-Black-4.jpg
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Midnightpromises

Active Member
One of the largest selling Honda models ever produced. I think around 20 million worldwide, that started the Honda explosion with the you meet the nicest people on the Honda commercials that being said probably parting out on eBay or something get a couple hundred maybe. I've got an old Fuji engine that I'm doing the same thing with and a few S90 and ST90 motors . The cost to ship those things will make it cost prohibitive for someone to buy the entire engine or they'll eat away any profits you might make by paying for the shipping yourself.
 

zenriddles

New Member
107115.
See picture further down in the thread. I think that is it, no?

I am in Lombard, Illinois. Spitting distance from 355 and 88.

About 1 hour from Rockford.
 

OldGuy

New Member
I have a '66 CM91. Lots of similarity to your pics. But I don't recognize the 2 "bracket like" items attached to the lower sides of the carb. They might be for the leg shroud panels that I don't have on my Rat-Bike version of the original. And my CM91, like your later pics (purple one) is not what I'd call a Small Wheel bike. But the serial tag doesn't lie... it's a CM91 motor.
 

MiniBike Mike’s Garage

Well-Known Member
I have a '66 CM91. Lots of similarity to your pics. But I don't recognize the 2 "bracket like" items attached to the lower sides of the carb. They might be for the leg shroud panels that I don't have on my Rat-Bike version of the original. And my CM91, like your later pics (purple one) is not what I'd call a Small Wheel bike. But the serial tag doesn't lie... it's a CM91 motor.
I could be wrong, but I don’t think the carb in his pic is original to the engine.
 

OldGuy

New Member
Per the commenters above... That's a CM91 motor, but the carb is nothing like my original.
I just went through the carb on my CM91 this winter. Definitely different.
 
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