Carb Swap on Motobecane

Has anyone ever tried installing a non-Gurtner carb on a Motobecane? If so, what model carb did you use? Dellorto? Bing? Were any mods to the intake or carb needed to accomodate the carb swap?

The reason why I pose this question is because most of the problems with Motobecane mopeds is related to the Gurtner carb. I'd be interested in finding out whether anyone has successfully changed model carbs on a Moby.

Larry

Re: Carb Swap on Motobecane

larry the peugeot owners have done altot of switching .. our gurtner carbs are the same ones used on mobys and yes htey are shit.. dellorto's work pretty damn good from everyone tha ti talked to.. I put a bing on mine just to see if it would work and it did..

Re: Carb Swap on Motobecane

Can Dellortos and Bings just be bolted on without any kind of mods to the intake? If so,I think I'm gonna experiment with different carbs this week.

Do you still have a Bing on your Peugeot?

Thanks!

Larry

Re: Carb Swap on Motobecane

Matt Wilson /

I had a dellorto on mine. It worked well and jets were easy to find.

They're pretty cheap at 50cc.nl

dopplercarburator.jpg

Re: Carb Swap on Motobecane

How did you engage the choke on the Dellorto? Did you make a "window" hole in the chain guard cover?

Re: Carb Swap on Motobecane

Matt Wilson /

Larry,

I used bike cables and ground the ends to fit. I didn't have any side panels so I didn't need to cut into the chain guard cover.

I also attatched a picture of it installed and complete

Matt

peugeot1.jpg

Re: Carb Swap on Motobecane

Matt Wilson /

That last one wasn't the one I meant to attatch.

peu.jpg

Re: Carb Swap on Motobecane

Matt,

I think you are referring to the throttle cable. Dellorto carbs have a choke lever on the side of the carb that you push down to engage. Do you just engage it normally since you have no side covers?If so, I guess it wouldn't be too difficult to cut out a window in the side cover.

Re: Carb Swap on Motobecane

What did you use to attach the carb to the intake? Will the carb bolt up to the intake without any reducers/expanders to bridge the connection.

Re: Carb Swap on Motobecane

I think I figured it out. It looks like the Doppler Carb has a choke that is engaged/disengaged with a cable. The Dellorto carbs we have here have mechanical choke levers. Where can I order one of those Doppler Carbs?

Thanks,

Larry

Re: Carb Swap on Motobecane

the moby i am selling is a bing and runs about 28-30 consistant it has a manual choke on top and with the missing cover is easy to access. i took it off when i first got it to clean carb i did not know it was not original untill i saw many others with different carb however it does have a reducer in throat of carb to make it fir intake. it looks like tinfoil but is some type of liner that works great.

Re: Carb Swap on Motobecane

Matt Wilson /

Larry,

I got the doppler kit for 70 Euros from 50cc.nl. It includes a 15.15 dellorto carb airfilter and a 15mm manifold. The carb just bolted on but to put on the larger manifold I had to slightly grind it down to get it to fit. It was no big deal, just a few minutes with the dremel.

And yes it is a cable actuated choke. That is the way the peugeot 103 is set up stock.

The "doppler carb" is actually a dellorto carb with a doppler manifold. I'd just get the carb unless you have a performance pipe and in that case a larger manifold would be beneficial.

I bought mine from 50cc.nl.

Matt

Re: Carb Swap on Motobecane

I have seen a Motoebecane with a bing on it, and I have a dellorto on mine. The only thing you really need to worry about is getting a carb bushing that will match the carb up to the size of the Motobecane intake manifold. Chris from The Moped Warehouse will custom make one of these for you.

simon

Re: Carb Swap on Motobecane

Reeperette /

IF, you can find an Encarwi carb, it's extremely similar to the stock motobecane carb, and is probably the best fit.

The downside is that finding those carbs at all is hard, and finding the 30mph version of them is even harder.

If yer gonna try, ask around for an old Tomos Bullet carb, which is the proper one.

But all in all, if you can make the DelLorto fit - do it, getting jets will be tons easier.

-R

Re: Carb Swap on Motobecane

I got my spare Dellorto to fit, but I had some performance prpblems once I got it on there. I dremeled the collar of the intake manifold to accomodate the Dellorto bushing. That was the easy part. Once I got it on there, it ran pretty well at higher speeds, but had idling problems and would just quit on me after a mile or so of riding. I tried a few other spare Dellortos that I had, and got similar results. I put my Gurtner back on this morning. It runs fine at high speeds, but the idle is very rough. I have adjusted and fiddled with that carb more than I care to anymore.

Thanks to everyone for all the help!

Larry

Re: Carb Swap on Motobecane

larry,

sorry that i havent been around to help you out, but it seems you have some good advice here... im constantly fighting my moby too... so feel free to ask questions... between the two of us, im sure we can get some decent bikes running.

casey

Re: Carb Swap on Motobecane

Thanks Casey. I've been fighting the Gurtner carb demons for weeks now. I've got too rich a mixture and I'm having a heck of a time getting some smaller jets from Moped Warehouse. I keep fouling plugs and I just can't get that carb to run right. I'm at wits end trying to get it to run and idle properly.

Larry

Re: Carb Swap on Motobecane

hey send me one fo those spare dollertos you got laing around

« Go to Topics — end of thread

Want to post in this forum? We'd love to have you join the discussion, but first:

Login or Create Account