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British Bikes / Re: royal enfield 355 1929
« on: March 11, 2024, 10:20:03 PM »
Hi Geoff and All,
I have only just now caught up with your posts
I have a fair amount of experience on the AMAC MDY carbs
These have a tapered neele just the same as later Amals, so after starting the bike you should open the air (choke) slide fully, (tight cable) and use the long lever just as you would a twistgrip
Most often there is no need to use the choke (air) lever just press the tickler until fuel starts to drip from the chamber top or bellmouth .
Did you remove the jet block from the carb body and clear the tiny pilot mixture drilling's ,
There is no separate pilot jet just the drilled holes, the drilling's in the block line up with others in the carb body exiting at the engine side of the throttle slide.
Not having a throttle stop on these carbs tickover must be set with the cable adjuster
This alters the speed of the engine as the handlebar is turned which can be a pain
A solution is to use the special outer cable as used on modern bicycle gear changes, this is wound on a long spiral to prevent the overall length changing as the handlebar is turned.
I have the AMAC instruction book on PDF which I can share with you if you need it
John
I have only just now caught up with your posts
I have a fair amount of experience on the AMAC MDY carbs
These have a tapered neele just the same as later Amals, so after starting the bike you should open the air (choke) slide fully, (tight cable) and use the long lever just as you would a twistgrip
Most often there is no need to use the choke (air) lever just press the tickler until fuel starts to drip from the chamber top or bellmouth .
Did you remove the jet block from the carb body and clear the tiny pilot mixture drilling's ,
There is no separate pilot jet just the drilled holes, the drilling's in the block line up with others in the carb body exiting at the engine side of the throttle slide.
Not having a throttle stop on these carbs tickover must be set with the cable adjuster
This alters the speed of the engine as the handlebar is turned which can be a pain
A solution is to use the special outer cable as used on modern bicycle gear changes, this is wound on a long spiral to prevent the overall length changing as the handlebar is turned.
I have the AMAC instruction book on PDF which I can share with you if you need it
John