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M741 Linkert Carbs

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The Indian Runner

Posts: 16

Joined: Fri Oct 05, 2007 2:50 pm

Post Sun Oct 07, 2007 2:11 pm

M741 Linkert Carbs

Well its that well trodden path again, …yep carbs. I am presently building up a WW2 based bobber (that’s a 741 based bobber with a WW2 theme,…. pretty original huh!) as I just love WW2 aircraft and am heavily into aviation.
I am looking at carb problems as I am installing WLA flywheels into my cases, and doing the now pretty standard stroker conversion that a lot have done.
Naturally carburation is going to need a look, and with the Linkert fitted to the 741, it has a pretty wheezy little venturi etc.
Does anyone know if much can be done to these M741 carbs to allow the beast to breath better? (i.e. Is it an easy job to take them out to something more akin to an M341 Linkert).
Or am I better off chucking it and replacing it with something like a M341, in which case is things like the bowl etc interchangeable? Obviously needles etc will not be, but naturally I will getting new ones anyways.
Happy Riding….. :roll:
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Cotten

User avatar

Posts: 2680

Joined: Thu Sep 30, 1999 12:01 am

Location: Central Illinois, USA

Post Mon Oct 08, 2007 5:43 am

Re: M741 Linkert Carbs

Runner!

You must cut'n'paste a 1 1/4" flange upon a 741 manifold to run a larger carb body, such as the M341.
(Then you can investigate large intake valves, relieved porting, etc!)

The bowl and choke assemblies are interchangeable. Most small hardware such as gallery plugs, springs, and the needle's knobs are the same.

....Cotten
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The Indian Runner

Posts: 16

Joined: Fri Oct 05, 2007 2:50 pm

Post Mon Oct 08, 2007 10:24 am

Re: M741 Linkert Carbs

Thanks for the info Cotten,

Yes, I was aware that the manifold would have to be replaced/modified, I just didnt know if the M741 carb body could be modified to enlarge it, and to take a larger venturi. Sounds like the easiest thing will be to get a M341 body and start from there.

Thanks again :wink:
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Jerry Wieland

Posts: 606

Joined: Mon Nov 01, 1999 1:01 am

Location: Menomonie, Wisconsin, USA

Post Wed Oct 10, 2007 6:39 am

Re: M741 Linkert Carbs

I'm with Cotten. I would do nothing until the engine proved to me that it needed a bigger carb. Jerry
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ironwigwam

User avatar

Posts: 124

Joined: Sat Nov 20, 2004 1:01 am

Location: Glenmoore, Pa. USA

Post Wed Oct 10, 2007 4:43 pm

Re: M741 Linkert Carbs

Most of us older fellows only used Indian chief wheels to stroke as it was kept simple and Indian
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The Indian Runner

Posts: 16

Joined: Fri Oct 05, 2007 2:50 pm

Post Fri Oct 12, 2007 12:26 pm

Re: M741 Linkert Carbs

Thanks guys,

I think that the M741 Linkert venturi sizes will be on the small side personally. What has others run carb wise who have gone down the WLA stroker route?

Happy riding,

IR
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Dusty-Dave

Posts: 887

Joined: Tue Oct 12, 1999 12:01 am

Location: Ojo Caliente,NM,USA

Post Fri Oct 12, 2007 8:41 pm

Re: M741 Linkert Carbs

Ziggy and a couple of others who I can't think of right now offer over size venturis for the M741.
Dusty
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The Indian Runner

Posts: 16

Joined: Fri Oct 05, 2007 2:50 pm

Post Tue Oct 16, 2007 11:34 pm

Re: M741 Linkert Carbs

Thanks Dusty,

Will look into it. :D

IR
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The Indian Runner

Posts: 16

Joined: Fri Oct 05, 2007 2:50 pm

Post Sun Oct 21, 2007 3:18 pm

Re: M741 Linkert Carbs

Just out of interest, does anyone know the internal diameter of the 45 Sport Scout inlet mainfold?

Thanks a bunch,

IR
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Cotten

User avatar

Posts: 2680

Joined: Thu Sep 30, 1999 12:01 am

Location: Central Illinois, USA

Post Mon Oct 22, 2007 6:24 pm

Re: M741 Linkert Carbs

IR!
I had two on the bench last week, and they were different.

The bore of a 1 1/4" model Linkert that mates to the manifold is 1.375".

...Cotten

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