Hi Rad

Timing sounds spot on and RPM is reasonable. You have obviously tried the mixture. But maybe have one last go to see if the idle needle has any affect.

As you screw the idle needle in the part throttle mixture will become leaner and leaner, and should help to keep the glow lit. But if you screw it in too far the part throttle mixture will become so lean the engine will not run, even if the glow is connected. So please go through the following procedure.

With engine stopped turn idle needle in 1/8 of a turn.
Turn the main needle at least one turn beyond its normal position
(This is because the turning in the idle will lean out the part throttle mixturem, but will also affect the full throttle mixture slightly so need to make sure the engine has enough fuel to throttle)
Start engine.
Take to full throttle and lean out the main needle in the normal way to get peak RPM.
Remove the glow and close the throttle and see if engines part throttle behaviour is improved.

If behaviour is improved stop and close the idle needle another 1/8 and repeat the procedure. As noted above always ensure you richen up the main before throttle up as idle needle does have some effect on full throttle mixture.

You will know if you have closed the idle needle too far as the engine will either not start at all, or it will die lean when you open the throttle, no matter how rich you set the main.

If this has no effect then will need to send to our service agent in the states, Bill Jensen. He is a very good man and will sort your problem! His website is:-

http://www.bj-model-engines.com/

Start by forwarding him this thread.

Many thanks

Keith