Engine stalling

[nigeldtr]

My A65 is running a treat and ticks over nice a smooth when standing at lights etc. Unfortunately, if I am not careful when I open the throttle, she will stall on me - always happens when I want to get off quick of course ?

Any ideas

[t20racerman]

I'd say it was the pilot jet setting. When you open up the throttle you give it a whole load of gas and air, but if the ration is wrong it will cause it to stall from such low revs. i'd try richening it a bit and see if this helps. On one of my race bikes (two-stroke, but same principal) I had a similar problem where I could bump start it and pootle around the pits, but opening the throttle much caused it to stall - you had to s-l-o-w-l-y feather the throttle to get it revving. A richer pilot jet solved it.

You only need to adjust your air screw - worth a try!

[nigeldtr]

Thanks for the reply. I have tried increasing the tick over and then screwing in to richen the mixture which then slows it down a bit did not seem to make too much difference - I'll give it another go and see what happens

[BSA_54A10]

Has it always done this ?
If so you might have a bad ( or wrong ) cut away on the slide.

[bikerbob]

Hi there
I have a 1963 A65 and had a similar problem when I first built it up it would not tick over at all that was a blocked pilot jet. Then on clearing that I had your problem this was caused by having the adjuster screwed out to far I read somewhere that a good starting point for the pilot adjuster screw is one and a half turns out and that after resetting the throttle stop screw solved the problem.

[BSA_54A10]

So from the top.
What carb are we talking about ?
Mono or concentric ?