Originally Posted by johnson357
Does FMF sell a Fatty for the chappy or did you make one fit? If so which one? I have a 4 speed one and a auto which I'm trying to make one real nice one out of.
I have modded a PW80 fatty pipe to fit. I cut the flange of the FMF and slide the chappy threaded collar on to the downpipe. I then made a new round flange to fit against the Chappy exhaust port and welded on. I then welded an extension pipe on the end and used a Viper scooter end can. The expansion parts runs along the frame like it was made for the job. It is much lighter than the factory system and you can decoke easily. The Chappy now revs harder and sounds much nicer. It climbs hills much better as well. Top speed is now nearly 50 mph ! I have upjetted the carb to a 105 jet but it still needs a bit of fine tuning.
Next job is to make 10" lambretta rims fit the hubs so I can fit trail tyres ( Sava MC17's )