can anyone help a friend of mine with information on setting up a Birmingham scott or could they point him in the direction of a birmingham scott expert for advice.
the bike runs well but is suffering from lack of power. he is wondering about set up of the oiler & if there are any other common problems with Birmingham scotts.
the bike had been dry stored for several years & I think this may have contributed but if anyone out there could help my friend would be very appreciative of the guidance
Not an expert, but this is how I did:
Ignition: With one piston in top position, put a light mark on the flywheel, measure 2 3/4″ backwords and put a mark there (gives an ignition at 35 degrees).
You can now adjust the ignition with a stropelight at 2-3000 rpm, or with a lightbulp at still, but then you have to wedge the autoadvance to full.
I use modern two-stroke oil, and as it is quite thin, setting the oilpump is a problem, it is set to next to nothing (I always put 1% in the petrol) start in the high end and go down, oil consumption should be 1000-1200 mpg.
Lack of power could be the result of a leaking crankcase.
Someone once mentioned that riding with thin (modern) oil didn’t “seal” the glands (crankcase) and he lost power, returning to thick (50) oil, restored the power, but first after 50 or some miles.
The Birmingham engine is not much different to other Scott engines.
thanks Jan I will pass the information on. I think you are correct as the bike lay for about 10 years before he purchased it & I think the sealsglands etc would have dried up through lack of use