I thought i didn’t need more mopeds for now, but then a old friend messaged me. He had this Vespa Bravo that he couldn’t get done. Everything was disassembled, engine and everything. The price was ok and included delivery, so i felt it was my duty to save this (once) fine Moped.
My first plan was to assemble everything as is, but the paintjob is just terrible . Everything is sprayed over, it needs a new paintjob.
The engine got a quick cleanup, new bearings and seals. The crankshaft was a bit abused, i’m giving it a chance. I’m running a original cylinder, the inlet timing and restriction are modified a bit. Just enough to pull a grown man, no racing engine… yet!
More information is found in the image descriptions, i will update the galleries with additional pictures when i get more work done.
To get better acceleration on my Puch Maxi, I adjusted my clutch to engage later at a higher engine speed. There isn’t much bottom end in the Airsal kit, with a heavy gear ratio it needs to build up some RPM before take-off.
I started with some stiffer springs, with as much preload as possible. Then i took about 12 gram weight of every clutch shoe. I ended up taking it down to 73 gram before i was happy with the result. I wouldn’t mind making them even lighter. Remeber to get an even weight and spring adjustment on all shoes.
I haven’t used my Puch Maxi in a long time, the aftermarket wire rims and cheap tires had a bit of vibration and the engine lacked power. I bought some Grimeca cast wheels and nice Schwalbe tires. For the tuning i got a new engine from my friend and club member Esben, don’t want to race the original number match engine.
I rebuild the spare engine with new bearings, seals and a stuffed DMP crankshaft. The topend is a 45 mm Airsal 4 port cylinder with a DMP head, the head isn’t designed correctly, i will need to make some adjusting. I started with a 15 mm Bing replica, but liked the 12 mm original square Bing more. The exhaust is a Jamarcol straight pipe, doesn’t make much noise and has pretty good performance. I need to adjust the clutch with lighter shoes and stiffer springs, there is not much bottom end in this Airsal kit.
More pictures and comments in the gallery below:
I’ve made scans of the Gilera 50 engine gaskets, for the engine cases and clutchcover. You can download them here in PDF format (click the links below).
You need to print them without any scaling, 1:1 / 100%. The engine case gasket is too large for A4 paper, you need A3. You can print on gasket paper and cut it yourself.
This years moped touring took place in southern denmark, from the westcoast to the small island Langeland. To get there we had to cross southern Funen, lovely roads and nature that we have ridden through several times. Langeland was amazing too, very quiet and lots of fun roads to ride.
We experienced the worst weather we’ve ever had on our annual summer trip. But with nice shelters and warm camp fires we kept a good mood.
Check our gallery and video from this trip below:
Moped meeting in Fole, 546 Mopeds in one place.
My east german MZ ETZ 250 – anno 1983.
Two stroke, single cylinder with 21 HP.