Linkert M74B

[Laurie]

Ok I did a leak test using a plate similar to the http://virtualindian.org/11techleaktest.html (forgot I had 1) and no leaks,
I should mention that the heads has had an O ring manifold conversion done.

My experience is that knuckleheads do not like M-74B's. They seem to prefer a M-35.

Jerry
I have a '46 thats been running a M74B for the last 8 years no problems there.

[Jerry Wieland]

My experience is that knuckleheads do not like M-74B's. They seem to prefer a M-35.

[Laurie]

Generally, Laurie,...

If they wont run any way but over-rich, it means extra air is getting in some where.

The very first diagnostic is http://virtualindian.org/11techleaktest.html

Only after the manifold is absolute can we address the carb itself.

....Cotten

Cheers Cotten, dont know why I didn't think of that! I'll do a leak test on the weekend.
Thanks mate!

[T. Cotten]

G'Day Folks
Ive just finished my 41 Knuckle and am having trouble dialing in my M74B Linkert, motor is a fresh rebuild by a reputable engine builder who cleaned checked and re assembled the carb, the only way to get this to idle and run is to have the low speed needle out 41/2 turns and so of course it runs rich and fouls plugs, I have tried shutting off the high speed needle, no help,
At the starting procedure with the low speed needle set at 3 turns out and the choke on 1 click starts and idles nice but as soon as you turn off the choke it stalls
any and all help greatly appreciated
cheers & Beers
Laurie

Generally, Laurie,...

If they wont run any way but over-rich, it means extra air is getting in some where.

The very first diagnostic is https://web.archive.org/web/20250615...hleaktest.html

Only after the manifold is absolute can we address the carb itself.

....Cotten

[Laurie]

G'Day Folks
Ive just finished my 41 Knuckle and am having trouble dialing in my M74B Linkert, motor is a fresh rebuild by a reputable engine builder who cleaned checked and re assembled the carb, the only way to get this to idle and run is to have the low speed needle out 41/2 turns and so of course it runs rich and fouls plugs, I have tried shutting off the high speed needle, no help,
At the starting procedure with the low speed needle set at 3 turns out and the choke on 1 click starts and idles nice but as soon as you turn off the choke it stalls
any and all help greatly appreciated
cheers & Beers
Laurie