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I got this '76 1000, had one not-so-good ride up and down the street, and nowwant it to run good. The odometer says 22k, but doesn't work, so.... I've found the compression to be low - 120, 60, 100, 110. I suppose that explains why it doesn't want to idle, all things elsewhere being in good shape. The carburators are top notch recent rebuild, ignition is good too. The transmission, clutch, and chargng system all seem to be ok. I assume the valves are needing attention, probably rings, too, although it doesn't smoke at all. I would sure like to just pop the heads off and back on, refurbish as needed. I'm not at all familiar with these bikes, or, motorcycles in general. Is it usual to regrind the valves, or replace them all?I want to dissasemble the heads myself, send it for seat and valve re-grind, do the laping myself,put it back together. If the valves have anypitting,do you guys reuse them anyway? How do the guides stand up in these, are they silicone bronze? stem seals?What is usually found? It backfires a bit on the first cylinder listed, I'm supicious it has a irratic valve seating problem. I've long since learned it is best to pick brains as much as possible, find out all the obvious,dumb as day nuances, as well as the subtle issues. If I can get away with leaving the engine in place, I'm all for it.
 

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I would start with an oil change, and a very healthy dose of Marvels Mystery Oil. I think you may have some stuck rings.

For stubborn ones, I have been known to soak them by adding a 50/50 mix of acetone and MMO through the plug holes. Reapply daily for a few days, and screw a few threads on the plugs in to seal it.

When you're ready to give it a whirl, pull the plugs and spin it over a few times. Give each cylinder a shot of WD40, install the spark plugs and run it.
 

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I would do a couple checks. If your compression is low, see if you can determine blow-by through the dip stick or oil fill.

On the low compression, I assume the oil was warm and throttle cracked open. May want to squirt a little oil in the cylinder. If you can not get the compression up, then I would consider removing that head for further inspection.

If you have pits in the valve seat, a machine shop can get them out real easily.

If you take the head off and disassemble it, you can check the valve guides and assess the rest. Seems that I always convince myself that the stem/guide clearance are acceptable to where I really do not bother with them.I may wiggle them. But, I am a hard core believer in replacing all intake and exhaust valve stem seals.
 

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A couple questions - are these head gaskets paper? I want to rebuild the heads, put it back together, and see what the results are. If the compression comes back up ok, then I'll put new gaskets, otherwise, go through the durned thing and make it good.
I put some oil down the plug holes - 120 went up to 160, 60 went up to 80, 100 went up to 120, 110 went up to 120, as your sitting on it left front to right rear. so the valves are burnt up here and there, rings might be ok except for cylinder 1... I'll dump some carb cleaner, marvel oil, kerosene, seam foam, pretty much everything I've got down that hole, see if it comes up.
 

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Get that thing running with brand new oil. Put a half bottle of sea foam in the gas tank & 1/8th into your oil. Take it for a good run and burn that tank empty. Than change your oil again & re test your compression with your throttle wide open. If you test with it closed, you will get a low reading. Your bike may not idle due to plugged idle jets as well as point gap, plug gap etc. most wings will fly like an f-18 once they are dialed in. your vintage is no exception.
 

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50% compression in that one cylinder with no smoke? That's interesting. I thought they all smoked when brought back to life?:coollep:
I'd go over the simple things first if not already;
Check valve timing at timing belts, tension etc.
Adjust the valves.
While in there you could check the springs on that low cylinder.
Is that low compression on number 2?
From what you described this is what I see:
1 2
160 80

3 4
120 120

Is that right?
I'm also curious which cylinder had the 755a carb. The larger jets may have been dumping more fuel into one cylinder washing out the lube for those rings. Just a thought. It might point to rings or valves.
Rings are a huge job. Remove engine, split the cases, get your plastigauge, gasket sets, etc. etc.
Heads the engine can stay on the bike.
Good luck figuring it out. They sure are fun when running right and running often.:waving:
 

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No gas in the oil, use sea foam because it is designed for use in oil as a scrubber.

i would go with 3 liters oil & the rest sea foam.
 
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