M-74 question

Is this warped?

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ThePan
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M-74 question

#1

Post by ThePan » Thu Feb 06, 2020 8:59 pm

I have a spare linkert that I thought I'd rebuild.
I have few questions though.
Is this warped? It's noticable enough to the naked eye that I put a straight edge to it.
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What kind of float is this?
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Thanks.



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Re: M-74 question

#2

Post by PanPal » Thu Feb 06, 2020 9:05 pm

I would try to press most of that out with a press , then sand it flat on a piece of glass with emory cloth or sandpaper taped to the glass.

ThePan
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Re: M-74 question

#3

Post by ThePan » Thu Feb 06, 2020 9:22 pm

Good idea. I'll try that...
I wasn't sure what would make the carb considered junk (since someone pulled it off) and not use it.

The plan is to soak the whole thing in PBlaster to loosen everything, and start scrubbing.

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Re: M-74 question

#4

Post by panhead_kicker » Thu Feb 06, 2020 10:15 pm

ThePan wrote:
Thu Feb 06, 2020 9:22 pm
What kind of float is this?
That float most likely will not serve well. I and many others on this forum can vouch for one of Tom Cotten's Durable floats.
Contact him at Liberty@npoint.net, I believe.
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Re: M-74 question

#5

Post by Excalibur » Fri Feb 07, 2020 12:14 am

Is this warped?
Yes, badly. From over tightening. Ensure the bolts have a screw driver slot in the heads and only tighten with a screwdriver. Put a spring washer on each.
+1 for straightening before dressing any metal off. Seen it done on other carbs using a through bolt.
What kind of float is this?
Looks like maybe a Rubber Ducky ??
My Pan Linkert runs a Liberty float and my Indian 741 Linkert runs a cork original. (No corn gas here... yet!)

ThePan
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Re: M-74 question

#6

Post by ThePan » Fri Feb 07, 2020 12:47 am

panhead_kicker wrote:
Thu Feb 06, 2020 10:15 pm
ThePan wrote:
Thu Feb 06, 2020 9:22 pm
What kind of float is this?
That float most likely will not serve well. I and many others on this forum can vouch for one of Tom Cotten's Durable floats.
Contact him at Liberty@npoint.net, I believe.
IMG_1343.JPG
Thanks for rec. I figured I would get one of those, once I determined the carb is still rebuild-able.

Any personal rec on cleaning products? Gum out? Diesel fuel? Ect.

ThePan
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Re: M-74 question

#7

Post by ThePan » Fri Feb 07, 2020 12:50 am

Excalibur wrote:
Fri Feb 07, 2020 12:14 am
Is this warped?
Yes, badly. From over tightening.
What kind of float is this?
Looks like maybe a Rubber Ducky ??
My Pan Linkert runs a Liberty float and my Indian 741 Linkert runs a cork original. (No corn gas here... yet!)
Wonder if this is why I ended up with it? The previous owner cranked on it and warped it. Haha

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Re: M-74 question

#8

Post by RUBONE » Fri Feb 07, 2020 12:57 am

That float is a late H-D replacement float. But still replace it with a modern one. You may want to freeze the body before pressing, brass seems to straighten well when frozen. Seems counter intuitive but it works.

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Re: M-74 question

#9

Post by awander » Fri Feb 07, 2020 1:31 am

The best way I have found to clean a carburetor is with an ultrasonic cleaner.

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Re: M-74 question

#10

Post by Raytag » Fri Feb 07, 2020 11:55 am

Zero experiences with ultrasonic here.
Does this work with brass carbs too ?
Currently tinkering with the same
Thanks
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Re: M-74 question

#11

Post by awander » Fri Feb 07, 2020 2:44 pm

Raytag wrote:
Fri Feb 07, 2020 11:55 am
Zero experiences with ultrasonic here.
Does this work with brass carbs too ?
Currently tinkering with the same
Thanks
Sure does...

ThePan
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Re: M-74 question

#12

Post by ThePan » Fri Feb 07, 2020 4:37 pm

RUBONE wrote:
Fri Feb 07, 2020 12:57 am
You may want to freeze the body before pressing, brass seems to straighten well when frozen. Seems counter intuitive but it works.
It does seem counterintuitive but I'll give it a shot.
Thanks for the tip...

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Re: M-74 question

#13

Post by Larry » Fri Feb 07, 2020 4:40 pm

Never heard that one. I'll try it.

ThePan
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Re: M-74 question

#14

Post by ThePan » Wed Feb 19, 2020 5:15 pm

I'm at a point where I am ready to correct the warped section of the carb. I'm not understanding what "using a through bolt" means exactly?
I'm looking for a little more guidance here. I've never put a press to a carb before.
Excalibur wrote:
Fri Feb 07, 2020 12:14 am
Is this warped?
Yes, badly. From over tightening. Ensure the bolts have a screw driver slot in the heads and only tighten with a screwdriver. Put a spring washer on each.
+1 for straightening before dressing any metal off. Seen it done on other carbs using a through bolt.

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Re: M-74 question

#15

Post by Excalibur » Wed Feb 19, 2020 9:38 pm

ThePan, study these pics of John Healy's jig to straighten Amal carbs As I'm recalling it, you use a feeler gauge under each bolt hole to over-bend the flange so when the clamping pressure is released it springs back to "straight". Obviously, while a Linkert straightening jig would be different, the principle is the same. Hope this is clear.

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