RE: Bell 47 Crash
G'day Lawrence,If you've been flying your B47 regulary(2month layoff is okay) then the diaphram and gasket should be okay,also check the exhaust outlet gasket if that blows
it can cause a few running problems.Usually a lot of exhaust residue gets sprayed over the model.
As long as the fuel is no more than a week or two old it should be fine,anything over that would be asking for murphy's law to kick in obviously the fresher the better.
Check your spark plug for oiling as that will affect the engines performance,wich means the mixture is too rich.
Walbro carby's are a good carby and used on alot of petrol engines and are easy to tune,just the two needles.
I'll chase up some pic's of mine,at the moment it's partially disassembled as I was messing around with the fuel lines and connected them up around the wrong way and not realizing it I glued the dummy fuel tank halves together.To cut a long storey short she wouldn't start and now I've got new dummy fuel tanks to fit.
I did test run prior to fitting the dummy's to make sure I'd got it right!.[:@]
cheers,
Glenn.