MOPED ARMY

where bret? in a code or serial somwhere?

could u be any more specific please, i have had an "A" stamped cylinder and one with nothing on it that are the same.

where at buddy

The J is stamped on the flat part at the top, where the head gasket goes - it even imprinted the J on the gasket.

I thought I saw a chart recently that listed the cylinder letters and the sizes, with the accompanying pistons? (Can't remember where though).

Oh god.

What are you starting here, Bret?

Everyone's going to start thinking that the lettering refers to speed again.

More specific?

Thanks Nerdo, that's exactly where I saw it!

honestly. i need to know! stop teasing!

Awww.. now don't be rude Bret. (but he is right, it is on the side)

what are you talking about? Where?

oh whatever. According to your post, Elliot, I have a fast cylinder on there. I got a spare slow one on the bench. I plan on dismantling each motor I receive anyway, so there.

mike it is cast into some of the cylinders on the left rear corner of the cylinder, the side that faces out not the back of the moped. anyhow make a port map of all the cylinders please which would be so huge important for everyone not just to me. put a paper into the cylinder and mark the top of the cylinder then rub wif a pencil where the ports are so it makes a map of the location of the ports. also dialing the event timing would be a excellent informations for r&d

i have 2 stock engines sitting right next to me. one has "A" stamped into the right side, with a 2 under that. Its seized, so i can only see the intake and exhast ports. They are round. The fins cut to differing levels, some all the way to the cylinder others only about half way through.

the other one (my daily rider) doesnt have the same markings. on the right side where the intake studs go in, it says "IUM203 3M13" some of those characters are pretty worn, but thats what it looks like. where the cylinder meets the case, it says "681051", then "CS 32" and then the motobecane symbol. The intake and exhaust ports are rounded, the transfers on the side are hard to tell... they actually look fairly worn disfigured, but still smooth. They dont look very square, but i wouldnt say theyre nice and round either. The fins all cut all the way into the cylinder.

Not much of this screams anything terribly obvious out to me just yet, is any of this valuable towards identification?

Steve I have one out of the same mold on my bench. EXACTLY the same numbers.

I have a 'fast' cylinder on my bike, but no A marking!!

If you've got 33mph out of the slow one.........

Both treats and 1977 have kits in the pipe. Just bide your time my friend.

yes but when i compare my cylinder to elliot's study, my "slow" cylinder matches perfectly to the description. My "fast" cylinder also matches perfectly to the description. Examine the pic... does yours not match up to elliots comparison?

I wanted a new cylinder even when ithought it was fast, so either way im still lookin.

And whats that about 1977 having kits? i didnt see anything on their site. or at treats for that matter.

ive got the cm13 as well, but i highly doubt this is the 20mph slow slow slow cylinder. More likely its a 25mph cylinder. people say you can get the 25mph cylinders going 30ish anyways, and i was doing almost that stock. but comparing it to your diagram, mine DEFINITELY meets the specs of the cylinder on the top

its about time. you should be slightly less descriptive next time ;) How many bikes has this held true on? Mine says CS32 and seems about right, but curious to see if this works for other bikes.

true for av10s too? I didnt think theyd put MPH on european bikes.

sweet find.