Topic: Carb repair

[Waggles]

Currently restoring a barn find '76 750 F1 which has stood for about 25 years so is well gummed up to say the least. Whilst stripping the carbs I managed to break off one of the float pivot posts while tapping out the pin ( despite having soaked everything in penetrating oil overnight ) Now carb bodies are not that common ( although I am obviously looking ) In the meantime has anyone repaired anything like this before? I don't like the thought of too much heat around such metals so I was thinking JB Weld as it isn't really stressed? or should I solder? or what?

FAQ seems to imply JB weld would be OK in such an environment, just wondered if anyone had experience?

thanks guys

[rbirkhan]

I did some JB weld on my 73 carbs but I dont have it running yet. I heard you cant use alumaloy as the carbs are pot metal not aluminum and esentially melt away when heated. I would think JB will hold up.

[Frostyboy]

I did some JB weld on my 73 carbs but I dont have it running yet. I heard you cant use alumaloy as the carbs are pot metal not aluminum and esentially melt away when heated. I would think JB will hold up.

It seems that in the right hands, they can be welded successfully
http://forums.sohc4.net/index.php?topic=22490.0

Waggles, put "broken float post" including the inverted commas in the search field at the top of the page.
Good luck, it does appear that others have had success with JB weld all the same.

[madmtnmotors]

This looks promising:

http://www.randakks.com/Float%20Pivot%20Post%20Repair%20Kit.htm

I've got a lawnmower engine carb that I'm considering trying to adapt this fix to.

[Gunner_CAF]

In this post, I have some pictures of how I fixed one:

http://forums.sohc4.net/index.php?topic=73339.0

It has not been run much, but we have started it several times, and we have given a few short test rides.  I took the bowl off after it was run and it looks to be holding fine so far.

Gunner

[Waggles]

Thanks for the input guys, think that welding is a bit beyond me! beautiful job tho.
Strangley enough I was thinking of a pin as well gunner, you give me hope. Something just tells me that although solder / braising or similar might be better, unless you can do that micro technique and not heat up the surroundings I would just melt the carb and cause more damage!

On paper JB should work judging by its spec so will probably go that way unless I can source another body.

Thanks again

[Nikkisixx]

Don't the 76 F's have PD carbs?  If so, I have a rack of parts carbs with a body in fair nick.  Someone confirm this would work:

[Frankenkit]

JB weld used to work, BUT it doesn't play nice with ethanol, and after some exposure, it ends up softening.  You may need to try to solder or braise OR (if you're feeling lucky) do the JB weld thing and then try painting on a tank sealer or something to prevent the gas from eating it.  I'm not sure how effective that would be but if you need to jerry rig it for budgetary reasons, then it's an option.  

[Spanner 1]

'76 F's have the 069A carbs which are the old style carbs, not the pumpers..... should be lots of spare bodies around.

[Gaither]

Waggles

Some years back I saw a [then] new welding product at an antique car show that used very low heat. Wasn't very expensive. It was demonstrated by welding pot metal. They even let me try it! Only thing I ever welded. Anyway, it "done good"!

I've been out of the old cars for a while but if you know someone into that, check with 'em and see if they have a Hemmings Motor News you can go through or search it somehow online. It would do what you need. Sorry I don't have more on it.

Luck to you!

Ain't these ol' bikes fun!!!!