41
Site Feedback / Re: unpopular forum, I wonder why.
« Last post by toglhot on March 12, 2024, 09:48:53 PM »As I expected, a couple of posts to prove my point.
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42
Site Feedback / Re: unpopular forum, I wonder why.
« Last post by iansoady on March 12, 2024, 05:00:59 PM »It's a shame that the OP who seems to be a capable person seems so touchy. But I'm sure we'll limp along without him. The population here may be small but is exceedingly knowledgeable and helpful.
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Site Feedback / Re: unpopular forum, I wonder why.
« Last post by Vreagh on March 12, 2024, 11:03:37 AM »I think you'll find it's a respected and knowledgeable forum which doesn't suffer bad manners easily.
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British Bikes / Re: royal enfield 355 1929
« Last post by geoff.godwin on March 12, 2024, 08:21:12 AM »Thanks John, I now have a pdf of MDY stuff and it did point me in the right direction. If I am quick enough with the air lever I can catch in one or two kicks. At the moment I am re learning how to ride ,made more difficult by excessive clutch drag. I had to put the bike into a hedge to avoid a homicidal van driver [only at crawling pace mind]. All good fun. Geoff
45
Site Feedback / unpopular forum, I wonder why.
« Last post by toglhot on March 12, 2024, 06:22:24 AM »I wondered why there were not many recent posts. After posting a few times and reading the responses, now I understand.
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British Bikes / Re: royal enfield 355 1929
« Last post by cardan on March 12, 2024, 02:52:42 AM »Hi John,
That's interesting - I'd not thought much about the tapered needle in the MDY (1928-on), but it seems this was it's first appearance on an AMAC carb. The tapered needle (usually called "variable jet") arrangement was covered in a 1913 Brown & Barlow patent, and was first used on their 1914 model carbs. So through the 1920s, B&B had models with tapered needles, and AMAC didn't. Until 1928. I wonder if this was part of the AMAL deal, where AMAC, B&B and Binks were amalgamated to form AMAL?
B&B's tapered needle and AMAC's air control on the side on the throttle body were two features used on the AMAL carbs for years...
Anyway, good tips for Geoff.
Cheers
Leon
That's interesting - I'd not thought much about the tapered needle in the MDY (1928-on), but it seems this was it's first appearance on an AMAC carb. The tapered needle (usually called "variable jet") arrangement was covered in a 1913 Brown & Barlow patent, and was first used on their 1914 model carbs. So through the 1920s, B&B had models with tapered needles, and AMAC didn't. Until 1928. I wonder if this was part of the AMAL deal, where AMAC, B&B and Binks were amalgamated to form AMAL?
B&B's tapered needle and AMAC's air control on the side on the throttle body were two features used on the AMAL carbs for years...
Anyway, good tips for Geoff.
Cheers
Leon
47
British Bikes / Re: royal enfield 355 1929
« Last post by chaterlea25 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
48
Japanese Bikes / Making a cam for twin to single points conversion.
« Last post by toglhot on March 08, 2024, 12:43:11 AM »Gone.
50
British Bikes / Re: royal enfield 355 1929
« Last post by cardan on March 05, 2024, 11:49:51 PM »Nice one Geoff! Hope you enjoy it.
Leon
Leon