drain the float bowl

Is there a way to drain the float bowls without pulling the bowl itself?
71,750 with original Amals.
I removed the bottom banjo bolt for the supply lines and got next to nothing out.
Be nice to get that ethanol fuel out before it sits all winter.

MikeM said:

Is there a way to drain the float bowls without pulling the bowl itself?
71,750 with original Amals.

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Fit the later 'drain plug' float bowls.

When you are about a quarter of a mile from home, turn your fuel off. With practice you can arrive home just as the engine cuts out.

Ian

The new green drain plug gasket seem to self destruct when you pull the plug.
The old red ones didnt seal as well but soldier on. I follow the turn off the tap
when on final routine but draining the bowel regularly removes any debris and water.
I do this even though I have been running non ethanol fuel this year.

Unless of course you are referring to the other type?



...in which case the answer is no. Recommend you swap it for the one that LAB has pictured, as they are far more practical!

That photo makes the float bowl ears look rather bowed due to over tightening!

But after the fuel line bolt is removed you only have the 2 (times 2) screws to remove in order to remove the bowl.
That way you can inspect the bowl interior for crud and check the float level measurement.

If you are going to put the bike to sleep for several months, I would recommend removing the fuel tank and turn it over to completely empty the contents and let it air dry. Empty into a clean bucket and you can see if any debris or water was mixed in with the fuel.
Swish around some oil to coat the interior while in storage. Keep in a dry area and it should be ready to go in the spring.

Bob, this was my ES2 when I got it - the carb leaked really badly because it was so warped!

Yes the earlier bikes have the no drain plug. As others suggest you move to new bowels.
Dont torque them down too much let the gasket do the sealing.

Mine have the banjo fitting that tie the two carbs together. Looks like I have to pull them off to drain and maybe get new bowls.
I should most likely upgrade the carbs.

Bowl could be drilled and tapped for a little drain screw.

Nortoniggy said:

When you are about a quarter of a mile from home, turn your fuel off. With practice you can arrive home just as the engine cuts out.

Ian

Click to expand...

Ian,
LOL
That's what I do. :lol: I time it so when I pass my neighbors property line, I can get to my automatic garage door opener and then drive it in without it stalling.
But I like the fuel bowls that L.A.B. pointed out if you need to do some carb work.
Cheers,
Thomas
CNN

L.A.B. said:

Fit the later 'drain plug' float bowls.

Click to expand...

I was all set to order a set of Madass's new float bowl drains, and I thought I'd better re-familiarize myself with my existing float bowls. My carbs are the original 932's that came on my '72 Combat, and have been sleeved at Lund's and are patiently waiting reassembly for when I get the rest of the bike's rebuild that far along. Sure enough, my float bowls are the original no-drain style. A check of Amal's, Old Britts', and Andover's websites indicates a supply problem for drain type bowls. Andover's 1972 parts list calls for the # 622/056 (0.125" - High Flow Seating) float chamber bowls. Old Britts' 1972 parts list calls for the # 622/055 (0.1" Standard Seating). Neither Andover or Old Britts parts lists for 1972's indicate a different p/n bowl for the Combat engine, and I'm planning on rebuilding this engine to its original Combat state of tune. Before I order new bowls, I just want to double check which new drain type float chamber bowls are the proper "flow seating" parts for a normal Combat state of tune engine? I'm guessing the # 622/056 High Flow Seating ones might be more better??
Thanks, Bill

pantah_good said:

My carbs are the original 932's that came on my '72 Combat,

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So, what size are the seatings?

pantah_good said:

Sure enough, my float bowls are the original no-drain style. A check of Amal's, Old Britts', and Andover's websites indicates a supply problem for drain type bowls. Andover's 1972 parts list calls for the # 622/056 (0.125" - High Flow Seating) float chamber bowls. Old Britts' 1972 parts list calls for the # 622/055 (0.1" Standard Seating). Neither Andover or Old Britts parts lists for 1972's indicate a different p/n bowl for the Combat engine,

Click to expand...

I'd say it was another incidence of AN changing the parts history (unless they know something we don't)?

According to the parts books, only the 850 Mk3 carbs had the 622/056 (0.125" seating) float bowls. :?

L.A.B. said:

So, what size are the seatings?

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I don't know. The bowls don't have any markings on them. What is the "seating", and is that something I can measure on them? My factory parts manual calls for p/n 622/050 which is the plain bowl style, but I can't find any info on what seating those would have.

pantah_good said:

L.A.B. said:

So, what size are the seatings?

Click to expand...

I don't know. The bowls don't have any markings on them. What is the "seating", and is that something I can measure on them? My factory parts manual calls for p/n 622/050 which is the plain bowl style, but I can't find any info on what seating those would have.

Click to expand...

The seating size is the diameter of the hole at the bottom of the brass seat.
http://amalcarb.co.uk/rebuilding-mark-1 ... arburetter

Ok, my 7/64" drill is too big to fit in that hole, and my 3/32" drill is too loose. I could jury rig measure the hole with an approx .1" dia. Q-Tip shank, which "fit". So, I'm now thinking it's safe to say my # 622/050 float bowl chambers would be equivalent to the 622/055 drain type float bowls, which Old Britts actually says they have two in stock. Make sense to get those? I am also planning on upgrading these carbs with the Stay Up floats and Viton-tipped aluminum needles. I still haven't found any Amal tuning instructions regarding properly sizing that seat hole diameter size.

pantah_good said:

I still haven't found any Amal tuning instructions regarding properly sizing that seat hole diameter size.

Click to expand...

https://www.princeton.edu/ssp/65-cub-da ... itbike.pdf

Page 3.

Concentric
622/052 .062" float needle orifice Two stroke fuel pump
622/054 .156" “ “ “ Two stroke
622/055* .100" “ “ “ Four stroke drain plug type
622/056 .125" “ “ “ Four stroke drain plug type
622/057 .062" “ “ “ Fuel pump drain plug type
622/058 .052" “ “ “ Four stroke fuel pump

Click to expand...

(0.100" is the standard 4-stroke size.)
http://amalcarb.co.uk/float-chamber-bow ... ating.html

Thanks for your help L.A.B.