Results 1–13 of 13
Peter Booth — 2 months ago
Yup! That’s how I realized that the carbs are stamped with model/date info. Now I have some questions about reassembling my AR2-10. I’m hoping someone here knows a lot about these two carbs.
Peter Booth — 2 months ago
Does anyone on here have a solid knowledge of the Gurtner AR2-10 737 and/or the AR2-12 873 carbs? I have both carbs and only just now realized that they are not the same. I have a few basic questions for someone who knows these two carbs (and where they overlap and where they differ).Yes, I know Gurtner carbs are horrible and yes, I know I should get a Dellorto. For now, humor me. I'm hopin
Peter Booth — 2 months ago
This was exactly the problem. I just hit it with a dremel and it is smooth like buttah! Thanks for all the ideas and problem solving. Much appreciated!! Now the project can move forward!
Peter Booth — 2 months ago
Well I think I've got the answer! It looks like the connecting rod is scraping against the piston skirt because the cut-out on one side of the cylinder skirt (to allow the connecting rod to pass the skirt) was not cut out properly. (So as the big end is moving from 6 oclock to 9 clock and then from 9 clock up to 12 oclock, the rod is getting locked up by the edge of the skirt.) I'm going
Peter Booth — 2 months ago
LOVE all these ideas! I'll start with piston/cylinder alone to see what that does.The ring gaps are oriented to the right and left of the front of the cylinder so they're not catching on any ports.I may also reassemble the whole thing with no rings to see what that does. I'm off to sleuth tonight with all the suggestions. Thanks all!Stand by for updates!
Peter Booth — 2 months ago
Thanks for your thoughts. It is binding up well before TDC. I had the same thought originally: If the head makes it catch, it must be hitting the head. Nope, something is making the cylinder/piston not match perfectly as the piston is catching about 70% up from bottom dead center. (So 30% below TDC)
Peter Booth — 2 months ago
Here's a link to a Google Drive with a photo of the assembly and then videos of....piston moving with no headpiston moving with head resting on cylinderpiston moving with difficulty as head nuts are put onpiston locking up when head nuts are tightened up.https://drive.google.com/drive/folders/193kHtT5HwfTx1mfhgfzIDXc3gTwdny8-?usp=sharing
Peter Booth — 2 months ago
My son and I got two complete Motobecane Mobys from a guy and are trying to make on runner out of them.We took both motors apart and the motors are pretty shot. We bought a new stock crank, crank bearings, seals, piston, cylinder and gaskets from Treatland (pretty much everything but the head and the cases).We put it all together and all was well until we got to putting the head on. With the head
Peter Booth — 7 months ago
Really?!?! I've never heard this. I might try that tonight.
Peter Booth — 7 months ago
Thanks all! Plug cap is ordered!
Peter Booth — 7 months ago
I have a 1978 motorbecane 50V that is just about all there. I picked it up yesterday and the first task is to check for spark. However, the wire coming from the coil just dead ends with no spark plug cap. I did a search of the Internet and found a part number of 23478. Then I went to treatland and tried searching for the part number, no success. And then tried searching for “spark plug cap“, again
Peter Booth — 7 months ago
Is that called a “Moby”? Or is “50V” the actual model name?I’m a motorcycle guy. So for example, depending on the year a Honda CB750 from the last 90’s is also called a Nighthawk.Is there a name for a 50V?And thank you! I’ll likely be on here a bunch asking stupid questions. 😀
Peter Booth — 7 months ago
My son and I just picked up two motobecane mopeds to build into one runner.I’m trying to identify the model. I *think* they are Moby (or maybe Mobyette?)A google search took me to this forum and this thread.