lambretta porting

matched casings, ported barrel - inlet , exhaust , transfers and slightly altered port timings.

 

nice neat work. Do you know what the original timings were? quite curious as most of the vespas etc seem to have peak torque very close to tickover

 

hi think they were 176 exhaust , 128 transfers and now they are 173 exhaust and 124 transfers. Its a gt 186 barrel with AF Rayspeed crank , 30mm phbh dellorto and a franspeed race pipe.
I will be changing the top end over to an imola some time in January whilst I do some more work on the gt barrel.

 

Nice work ! Remember to chamfer the ports a bit !