M35TP carb question

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rob.mat
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M35TP carb question

#1

Post by rob.mat » Tue May 14, 2019 8:40 pm

I have just acquired a M35TP carb which I believe to be correct for my 1948 FL Panhead. When I insert the main nozzle into the body of the carb it
passes through – it does not but up against the venture as it does on my M78B. The 1-1/8” venturi is shorter than the one in the M74B, so the
retaining spring ends up below the surface and does not protrude to be compressed at all by the float bowl nut. A friend has a 47 Knuckle and his
carb is the same. He says that on the M35TP the main nozzle ‘floats’, but this does not seem right to me (he also could not get the M35TP to work and
ended up using a M78). Does anyone have any information to help me here or can they point me in the right direction please?
Rob



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Re: M35TP carb question

#2

Post by RUBONE » Tue May 14, 2019 10:18 pm

The main nozzle fits exactly the same way on an M35TP as it does on an M74 (there is no M78). The top shoulder of the main nozzle indexes the slot in the venturi allowing the main nozzle to protrude. The spring does indeed hold it in place, no "floating".

rob.mat
Posts: 10
Joined: Tue Sep 20, 2011 10:06 pm
Bikes: 48 pan 53 pan, 56 pan

Re: M35TP carb question

#3

Post by rob.mat » Wed May 15, 2019 11:47 am

Hi
Thanks for your fast reply. That is just how I would expect it to fit. The venturi on my carb is only about 1-1/16" long, and does not reach the nozzle by about 1/2" - this is why the nozzle passes clear through. Pictures attached to show you what I mean. What confuses me is that the M35TP on my friend's knuckle is identical, guess that's why he couldn't get it to run right. Anyway I did not want to steam in and replace the venturi if it was historically significant. Now that it looks like I am to replace it, would you recommend changing like for like, or increasing the size while I am about it?
Regards Rob
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Re: M35TP carb question

#4

Post by RooDog » Wed May 15, 2019 1:02 pm

You might want to take a look here, "Into the Wilderness Trading". I found them on the interweb but have no experience with them.... RooDog....

http://linkertcarbs.com/venturis.html

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Re: M35TP carb question

#5

Post by Buddhahoodvatoloco » Wed May 15, 2019 1:20 pm

These gentlemen are a hoot to chat with, and are well informed. I have done bizzzzzzzzzzzzness with them, highly recommended.
RooDog wrote:
Wed May 15, 2019 1:02 pm
You might want to take a look here, "Into the Wilderness Trading". I found them on the interweb but have no experience with them.... RooDog....

http://linkertcarbs.com/venturis.html

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Re: M35TP carb question

#6

Post by RUBONE » Wed May 15, 2019 2:01 pm

That carb is assembled completely wrong and it appears the venturi is incorrect. Any 1-1/2 inch carb venturi will fit it, either the 1-1/8 or the 1-5/16 type, but all keep the nozzle in place. You have wrong parts in there. I have a couple M35TP carbs and they are just fine.

rob.mat
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Bikes: 48 pan 53 pan, 56 pan

Re: M35TP carb question

#7

Post by rob.mat » Wed May 15, 2019 3:53 pm

Thanks, I was sure that was the case. I just didn't want to disturb anything till I sought advice. Still cannot understand how 2 carbs were identically incorrectly assembled though. They did not even come from the same source (I bought mine in the US and my friends has been in the UK for many years). I will replace the venturi now.
Regards Rob

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Re: M35TP carb question

#8

Post by RUBONE » Wed May 15, 2019 11:15 pm

Post a picture of the venturi you remove after it is out. Does it have a hole in it for a nozzle?

rob.mat
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Bikes: 48 pan 53 pan, 56 pan

Re: M35TP carb question

#9

Post by rob.mat » Thu May 16, 2019 1:38 pm

Hi
Will do. Can't make out a hole with it in. I'll also add a picture of my friends carb showing his venturi if I can catch him over the weekend
Regards Rob

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