Since I knew the old pipe on my morini M02 was clogged, and also restricted, and since there was a large moped parts sale, I decided it would be a good idea to pick up a new one. I took advantage of the sale to also pick up some carb parts. My carb wasn’t really “broke”…but was certainly leaking. This was no fault of the 50-year old dellorto (sha 14-12, for those who are curious), but the gas line that I installed turned out to be a smidge too big to really clamp down on the fuel banjo, not to mention that the in-line filter behind the banjo was probably clogged as well.
So, after some shipping snafus on the part of the supplier, my parts arrived about three weeks after I ordered them. Grr. And, true to this being a project bike, they didn’t fit!
The exhaust header, for the metrakit MKIII exhaust was waaay too big. I think the cooling fins on the engine block might taper, so it is possible they just took a bad measurement and produced a bunch of exhausts that don’t fit. I guess I will just have to expect a lot of filing and fitting in the future.
After a lot of filing, I managed to get the exhaust to hang onto the bolt that used to have the center stand spring attached to it. I don’t know what the final solution to the problem will be, but it may end up being some kind of hack-and-weld job that attaches the new expansion chamber to a better-angled pipe.
I also picked up some B6ES plugs from the un-named supplier, because of some advice I got from moped army, where someone pointed out that I had the wrong plugs. oops!
Good thing someone caught that. ES stands for “Extended”, and the extended plug is in fact, quite a bit longer than the regular plug. In a 50 CC engine, this is kind of a big deal! My estimate is that they were maybe 3CC larger. If you take the original compression ratio of 7.5:1, that means that the compression with the HS plugs was roughly 6:1- which would dramatically decrease power.