Hi all,
I'm probably not going to enjoy the answers but I still need put out of my misery...
30 years ago I acquired a small pile of A7 bits which included an AA7 engine (1951). 25 years later I thought it would be a good idea to haul the engine and random bits out from underneath the bench and build a bike. And - quite remarkably - I've more or less done that. A standard looking but very non standard plunger A7 emerged, eventually. Now after a prolonged and herculean effort I'm at the final finishing stages and tonight I started to fit the carb. The engine has always been in one piece all these years and last year Rob Wardle rebuilt it completely for me
When I measured the carb - 1" - and then the inlet I found that the inlet hole is 1 1/16" (27mm). Consternation, as this is A10 terrritory. I cannot find anywhere a reference to a 1 1/16" inlet A7 head.
Seems that this lovely rebuilt engine has an A10 head???
Before I pull the head off can anyone make my day and tell me that BSA did indeed make a cast iron, single carb 1 1/16" inlet diameter head for the A7? Is there a way I can check for sure that it is an A7 or A10 head without taking the head off?
Does anyone have a good supply of valium they can deal me with?
Will I be able to sleep tonight?
Answers please on a postcard...
Alan