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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 11-02-2012, 08:24 AM   #11 (permalink)
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Quote:
Originally Posted by DAVE M View Post
are you sure that's a pre unit Caulky?

looks like a unit 500 to me
You could be right Dave, nil experience with 500`s.
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Old 11-02-2012, 03:01 PM   #12 (permalink)
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A Mk I Amal is a Mk I Amal, right. So, the throttle cable should be in the sam hole regardless of the engine it is on.

It looks like the cable is in the right hole, but the cover is on backwards. I did not think that was possible but I had Jap carbs in my brain. Just went out to my two fully disassembled Mk I Amals and yup, you can put the cover on backwards.

So Steve, turn that cover around for starters.

Now that begs the question is the slide in backwards. Yeah, I know there is a lug on the slide and a mating groove in the carb. But somebody might have filed that lug off for some obscure reason before Steve got the carb. So please make sure that the cutout faces the rear of the bike. If it is in backwards, it will act as a choke and even if you could get it to run, it would be super rich. You video however does not give the impression of an overly rich mixture. But then again, if there is no guide lug, the slide could be in just about any position.

Now I'm going to ask another dumb question because I'm sure stranger things have happened. Given that the cover is on backwards, you don't possibly have the throttle cable connected to the choke slide, do you? And the carb slide is just sitting in the bore feeling all alone and with no connection to the outside world? I could see someone who has only seen CV carbs before thinking that the slide is actuated by vacuum and the choke slide is the buterfly in a CV carb.

So, more stuff to check/confirm on your starting issue.

As for you oil leak. I did not look for it in the video, so I went back and looked again. Yikes! That is one mutha of a leak. Your original description was something like "coming out by the small gear on the chain". To me, since you cannot see the small sprocket on the primary, you muct be talking about the counter sprocket on the mainshaft of the tranny where the rear drive chain attaches. If that is what you are talking about, I'd say you are either missing a seal on the mainshaft where it exits the tranny case and enters the primary or you are missing the seal in the coverplate on the inner primary case and leaking primary oil (should not be that full but who knows). Maybe you are missing the whole cover which would align with the primary oil level. Go to your parts book and you will see the seals and the cover I'm talking about. I'd say forget about riding the bike until you get that leak sorted out. I would not even worry about getting it running until you fix that problem because it is not a minor one.

regards,
Rob

Last edited by Snakeoil; 11-02-2012 at 03:07 PM.
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Old 11-02-2012, 03:45 PM   #13 (permalink)
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whenever people discuss a carb problem someone has to chip in with a question about timing.

Is the timing roughly set?

you should have the notches in the flywheel I think?
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Old 11-02-2012, 10:59 PM   #14 (permalink)
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Thanks guys again!!! It is a 1966 500cc engine for clarification. This engine ran before I removed it from the frame. I have not gone into the engine. I have had the primary cover off, and the outer clutch cover on the other side. I did replace the gaskets. Yes, the oil appears to be coming from just below the gear that has the chain on. I have not been in there. Could I have maybe overfilled and it's running over??


I may have the top of the carb turn around, I did not know there was a right way. I will change it. The carb slide is facing the right way and in the little slot. I do have the slide hooked up as well. Tough little bugger.
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Old 11-02-2012, 11:22 PM   #15 (permalink)
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The oil is coming from the crankcase breather pipe,just in front of the gearbox sprocket.There should be a breather hose conncting the breather to the oil tank breather with a Y-piece.The breather hose will then continue to some convenient place:down toward the ground,or back along the rear mudguard.

If it's blowing out a lot of oil,the oil level in the crankcase is most likely too high.If the return oil pump is working properly,all that extra oil will return to the tank after you start up.The tank level will rise and possibly overflow.

None of that will prevent the engine starting,although it may smoke out the exhaust form a few minutes after you start up and there is still too much oil in the crankcase.

It should start fine without an air filter,but you should fit one later.The main jet size won't have much effect below 3/4 throttle;do a main jet test if you plan to run without a filter.
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Old 11-03-2012, 07:49 AM   #16 (permalink)
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The carb for a `66 500 should a monobloc 376/273, according to Amal.
But there are three sizes, 15/16...1.00 and 1 1/16.

So you have a 626 Mk1 concentric fitted with a .180 main jet.
If the jet holder (large nut) is undone the needle jet can be inspected.
There appears to be two sizes of needle jets for 500`s, .105 and .106. (cross-drilled) and there are other sizes.
The needle should have three small identification grooves at the top.
If the needle clip is in the middle (large) groove, try the lower one.

Most of the innards are variable, jets, slide, needle, etc.
Your jetting maybe wrong or there could be air leaks.
Fitting an air filter will enrichen the mixture.
The slide will be idented for the cutaway size, 3, 3.5 etc.
It is recommended that a viton tipped aluminium float needle is fitted.

Clean the pilot jet and also do a fuel flow check.
Make sure the breather hole in the fuel filler cap is not blocked.

If all is well, adjust the horizontal [mixture] screw until it bottoms, then unscrew 1 1/2 turns.
The other [angled] screw is the throttle-stop, which is used to set the tick-over speed.
Initially, set it to just lift the slide a little.
A couple of new plugs wont go amiss.
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Old 11-03-2012, 09:48 AM   #17 (permalink)
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thanks guys.......trying again in an hour!!!
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Old 11-03-2012, 12:25 PM   #18 (permalink)
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It's Alive!!!! I have been told by the previous owner that the main seal behind the clutch has always leaked. GREAT!!!! Now I need to fix that!!! Any suggestions???

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Old 11-04-2012, 08:38 AM   #19 (permalink)
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tickover's a bit high!
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Old 11-04-2012, 03:29 PM   #20 (permalink)
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Tickover may be high but at least now she lives! Congrats on getting it running: plenty of scope for fine tuning now.

I wonder, do you actually want that giant magneto sticking out the side of the engine like that? It looks very vulnerable if you ever drop the bike on that side, plus (in my very humble and probably entirely wrong opinion) it looks ugly and serves no purpose that an ordinary set of points wouldn't serve equally well and much more compactly. Reason for asking is that some people pay a lot of money for those mags, and you could buy some nice stuff - or pay for some expert labour - if you were to sell it. Just a suggestion - now watch all the Joe Hunt mag fans bite my head off!
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