Yes, you need a ground. On my bike, the ground is picked up on one of the 4 bolts that holds the fuel pump in place. Use a crimp/solder ring terminal to pick up a ground there.
On the rear of the engine cover is a little tab, that looks like a spade terminal (it's part of one of the switch contacts). That is the point where you hook up a wire to the tail light. The tail light should use the fender as its ground.
Yes, but the original bulb is a screw base bulb and will not fit in the lens that you have. You may be able to find that 15W style bulb in a 6W size, but I don't know. You may be able to find a socket adapter to be able to use the original screw base style bulb in your Velocruz lens. see attachment. The only place that I know of to get these adapters is from <www.lesolex.com>
in France, but I'm sure they must be available somewhere over here.
Rear bulb should be 14V AR, but you can use a 12V 6W .5A or a 12V 4W .35A bulb. The only place I know of to get the correct 14V AR bulb is lesolex.
You can e-mail Jeff at Velocruz and see if he has any of the bulb adapters or 14V AR bulbs.
Yes, you can install a Hungarian flywheel and lighting coil if you wanted to. The parts are interchangeable. The Hungarian coil has an extra lead that can be used for a brake light system.
Or, if you have a flywheel from a 1975-78 4600 V2 or V3, you can put that on your old 3800 and it would light up that Velocruz 15W bulb. I have one 1973 3800 set up like that. (See attachment) I rebuilt this bike using mostly Velocruz parts.
I'm guessing that Jeff is going to send you a screw base (flashlight type) bulb that will not screw into the lens sold by Velocruz. You might want to double-check with him about exactly what he is sending. You may need an adapter.
No; no knobby tires on my bikes...just a grainy photo. It's very important to use only tires with the straight tread pattern...no vee's, slants, zees or anything irregular. If you don't use the correct straight tread, the roller will wear away and you will get a lot of vibration.
The second one, frame number 8020192, should be a black S 3800. It is from 1973, a little earlier in the year than your other 1973 S 3800. It should be exactly like your other S 3800, with the exception of possibly the brake levers. They will both have the reverse levers, but the earlier bike's levers might be a little more rounded off on the bottoms...maybe. The later one's levers might be a little more squared off on the bottom. They were changed right around those serial numbers. The motor serial number will probably start with a 528 or 529. Let me guess for fun...5285589...how far off am I?
The first one, frame number 8087359, is a model 4600 V2 from 1975, approximately April. It should be yellow, orange, blue or black. I'd like to guess the motor serial number of this one also, if you'd help me out....7217105. How far off am I?
Both of these bikes were made at the SINFAC factory in France and were intended to be sold in the US. In other words, they were not sold in France and then imported here. The basic frame and motor parts are the same. They both use the cyclomoteur 3800, but the cylinders and cylinder-heads are different between the two. The older one should have the TUM 80A cylinder and the 4600 should have the TUM 80A CM 6.5 which is a better cylinder. The main differences between the two are the handlebars, controls and lighting, which all must be changed as assemblies if you are going to mix-and-match. For example: if you use the 1973 3800's motor on the 4600, it will not light up the lights and there is no coil for the brake lights. You would need to put the 4600's flywheel and coils on the 3800's motor. Another example: you can not put the 4600's controls on the 3800...the handlebar diameters are different. Another example: if you put the 3800's headlight/hood on the 4600 motor, there is no power supply stud coming out the back of the stator for the switch to contact. There are many examples like these.
no problem getting back to you with that, I find it pretty interesting.
Kind of ironic... the 3800 has a service sticker on the rack from an old gas staion I grew up near. Joseph's (otherwise known as Mo's) Service Station ( a Mobil I think). It hasn't been around for at least 20 years, however, I recall he used to be a dealer for either Indian or Whizzer, I forgot which.
To top it off, when I called the guys on his ad in the paper today, it turned out that I had to drive about five blocks from where I work downtown Detroit. It was a very good day!
Hi John, Did I read on another post that you got both Solex's for $100? If so thats a pretty sweet deal. Also was it you that was bidding on the 3800 in Grand Rapids? That one went for over $500 and I don't even think it was running.
Yeah, that was me that bought the two for $100. I actually got one of them running last night although it still needs work as it only runs well with the choke on all the way. I did bid on the one in Grand Rapids as well, however, after finding the two in the paper, I know longer wanted to drive an hour and a half to get it. I wouldn't have bid that high anyway, so everything worked out well.