The Cylinder Speed is stamped into the outside of the cylinder.
The Cylinder Speed is stamped into the outside of the cylinder.
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.
I have a J stamped on the top of my cylinder. I think that is just to match to the piston size.
where at buddy
is this a eureka moment or some sort of sarcasm?
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).
What are you starting here, Bret?
Everyone's going to start thinking that the lettering refers to speed again.
Those letters are only for piston matching.
Thanks Nerdo, that's exactly where I saw it!
You ought to be clarifying this...
honestly. i need to know! stop teasing!
It's right there on the side, pick it up and read it! Sheesh, do I have to do all the leg work? I'm on vacation!
Awww.. now don't be rude Bret. (but he is right, it is on the side)
How is it written, A B or C? or 20 25 or 30? One of mine says 13, the other nothing...
what are you talking about? Where?
i'm gonna look 2 nite at a stock cylinder and figure it out, its obviously not that easy to find if bret just discovered this a few weeks ago. Or maybe since we don't run stock anymore we just stopped looking.
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.
Allen and Elliot, I showed you this in person. It's on the right hand side, okay? Jeeeeeeeeeeeeeeez.
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
next time it's apart absolutely!
i don't know if it's worth mapping the slow cylinder though.... that I could do now but it looks just like the one in elliot's pics
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?
oh shit! haha just read that old study elliot drew up and oh no! i have a slow cylinder on my daily rider!!! All i thought i knew was a lie! I cant decide if thats good or bad though, cause i was still doin about 33 w/ the slow cylinder. Im almost more impressed than i am disapointed.
Especially sucks that my fast cylinder is seized. Damn!
Well ive been in the market for a new cylinder for quite a while now anyways. I guess this is just gonna push me to do it.
By the way, not that my opinion has a whole lot of bearing on this matter, but i think elliot's writeup is pretty good to base it off of. hits all the key points. its attached, just incase youre not familiar.
Got any cylinders for sale?
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.
I'd like to chime in with my discovery of the semi slow cylinder. Uh huh, Semi-slow. Look at my post about "G" Cylinders. My friend had a slow jug and one thing I noticed about the slow jug he had was the transfers and exhaust were never fully opened at BDC there was still a mm of piston left in the windows. My "G" cylinder has the wide square ports but they get fully exposed when at BDC.
just something I thought I'd share
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.
i have a feeling that there are more than 3 types of cylinders, there are differnces even between the fast ones, and some of the really slow 20mph ones have a ridge and go in 20mph bottom ends, these are the really slow ones. yeah i was able to squeeze a little over 30mph out of the 25 mph cylinder, i think the ones in my study are a fast 30 mph one and a semi slow 25mph one not a 20 mph like its states, since the 20 mph ones are extreamly slow and have the ridge in the cylinder sleeve.
Bret this picture is from your VLX i fixed for bella to ride its really slow and there on the side is stamped "CM13" so are you saying this is a slow cylinder because of the "C" and did you point this out to me when i was drunk or somthing cuz i don't remember at all.. yopu can see the stamp next to the intake mounting stud
if ur wondering about the springs i'm make i new thread about stripped exhuasts.
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.
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