Modern Vespa

I am in the midst of rebuilding a dellorto shb16. Ordered a rebuild kit, which is meant for both the 16 and 19, but wound up with about 5 gaskets and washers leftover. There were some things not in the kit which I'll order, but have some questions about them.

Banjo washer or packing. There is a red washer that sits under the banjo; both the banjo and filter press down on it. No idea where to find a replacement, and can't seem to find this in online stores. Is it just something I can pick up at an auto parts store? Also was curious why the banjo does not fit over the filter, and instead sits on top. That didn't seem right.

Packing between air box and carb. Easily found online, but is it typically replaced in a rebuild?

Air box unit. The pins on it are tight, is it worth prying them open to clean the filter? Can these be replaced?

In other blue badge updates, the fuel tap was not functioning, and looked like it had been through hell when I pulled it. Carb cleaned up nicely except for those missing pieces.

Is your banjo on top or on the side of the carb? I've never rebuilt a 16mm but on a 19mm the fuel banjo is on the right side. For the 19mm the fuel filter goes in first, followed by the banjo cover and place the red ring on top of the of the banjo in the recessed part and insert bolt and snug it up. I see some 16mm have the banjo on top, sorry not so sure of the installation sequence.

Here's a site for parts diagram: Dellorto Carburatori

Or this site: Dellorto carbs. Sift thru the different types, they have a pdf file for the diagrams. I'm not so sure if its an o-ring gasket to seal but on the 19mm it uses a cork gasket. You can service the air box by remove and replace the split. Some people remove 1/3 of the steel gauze and or drill holes. If you go down this route be sure to jet accordingly 'cause stock jetting will be a bit lean.

Other parts of the kit: rubber grommet fits on the arm that connects to the throttle slide. O-ring for float bowl. Paper gasket for throttle cover.

The scooterwest site is down but the have a complete rebuild kit for 16mm which includes everything including float and needle and replacement steel air filter gauze.

Good luck.

I just cleaned up my SHB 16.16. Didn't do a rebuild though. The last time I bought a rebuild kit, there were all sorts of gaskets and washers that didnt seem to go anywhere.

The gasket between the air box and carb seemed in pretty good condition, so didnt need to replace it. I would take it off and open it up. Mine was quite dirty on the inside, and the steel wool filter needed a good rinse in petrol, as did the inside surfaces which had a fair amount of crude on them.

Careful with the split pins, as both mine broke at the tips when I tried to bend them over on re-assembly.

What jets has yours got. Mine had 74 main and 42 idle.....

It does sit on top. I ended up finding a diagram on the SIP shop site. That cork (?) packing beneath the filter does not appear on the diagrams. I ended up leaving it in there, and it seems just fine.

Anyhow, even with lots of missing pieces, I got the idle & mix set at a generic 2.5 turns, and combined with a new fuel tap, she fired up after 5 kicks. Plenty of adjusting to do on the carb - a bit more smoky than I expected. But the scooter has not been in working condition for at least 15 years so I am sure there is a lot of crud. Also need to get some oil better than the leaf-blower variety.

I am pretty sure mine are the stock - so 74 and 42. Runs strong, though need to adjust the idle and mix. The air box will definitely need a deep cleaning, but just getting the scooter running feels like a big step.