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  #21  
Old 1 Week Ago
Ferrous Head's Avatar
Ferrous Head Ferrous Head is online now
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It would be really good to know if the engine has had any use to start with.

I say Avgas simply because the horse drainings many gas stations now sell might not cope with 9.5 to 1 compression. Running rich and slightly retarded timing will help with that.

Pull the inspection plug on the left hand side of the engine just underneath the case bolt that holds the two halves together.

With a good flashlight have a close look at the flywheels. Your looking for inspection marks and any numbers you may be able to see. Do the wheels look like very shiny steel or closer to newly machined cast iron ?

Head castings will have a Mocasco casting stamp if anything. The only aftermarket heads I've seen were all alloy.

But the cylinders may have "FRONT" and "REAR" on them, or might have a Harley typr part number (ending in a -57 or something entirely different.

Seriously, I think you have done a very good trade.
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  #22  
Old 1 Week Ago
needspeed needspeed is offline
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The cylinder head cooling fins, though hard to see in the video, show that they are not '66 heads. They look like 1000cc heads. Based on the bore 3.236 it's very possible that someone put a 1000 top end on your 900 cases, bored .050 oversize to 1027cc.
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  #23  
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ProLibertate ProLibertate is offline
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Thank you for your input. I'm happy to take detailed photos of anything that might help you guys with identification. I greatly appreciate your willingness to share your knowledge with me. I never expected to receive such an outpouring of support! It seems like I've no sooner posted than I've got a reply (or two) waiting.
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  #24  
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ProLibertate ProLibertate is offline
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Quote:
Originally Posted by Ferrous Head View Post
Pull the inspection plug on the left hand side of the engine just underneath the case bolt that holds the two halves together.
I discovered this plug was missing, the case welded up and ground flat. What the heck?
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  #25  
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Iron Mike Iron Mike is offline
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Post a pic of left side of case please.
Is just the timing plug welded up or the whole left side cyl base area?
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  #26  
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Well, I've not seen that before.

Are we looking in the right place ?

Left side about two inches below the cylinder bases. Underneath the smaller case bolt (5/16ths ?).

It would make ZERO sense for anybody to do that. They often get stripped but there are oversize taps and plugs for that.

Without that inspection window timing and oil pump timing becomes a lot more difficult. To say the least.
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  #27  
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Sometimes, the cases have material added when going to big bore cylinders. The cylinder base bolts are farther out on the later 1000cc cases.
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  #28  
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Would you like to take back what you said about me hitting the jackpot, Ferrous Head?

Why in haven's name would someone do something like that?

Last edited by ProLibertate; 6 Days Ago at 03:08..
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  #29  
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  #30  
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Ok. Has it definitely been welded and re-surfaced ?

Is it possible they were never drilled and tapped from new ?

If that were the case I could understand someone getting their hands on unmachined cases from the factory abd then machining them to suit their engine.
Also, John Trease did cast some 900 style cases that were different to the stock HD cases in a couple of areas. The price for those cases when I talked to John was $5,000 AUD. I declined to buy a set but other may have gone ahead. (I wish I had now).

But if they have been welded and not drilled and tapped it's not as easy to set timing points but of course it can be done.

It means making an adapter and using a degree wheel but with the belt and clutch you have you can run the primary dry.
That would make the whole job a lot easier.

Looking at the belt, it's brand new. I suspect the drive is as well. I think your still going to find this was a very good trade. I would be very surprised if the bearings in the clutch hub are worn.

it would be very interesting to know exactly what this engine is. If it were mine I wouldn't be able to stop myself pulling the heads for a good look and pulling the cams to see what's in there.

Actually, if you make up and adapter for your degree wheel you can check the opening and closing points of the cams anyway.

Persever, I think you'll find this is a good engine.

Mind you, the bike is pretty ugly and ratty so I cna probably find a buyer for you. Always people here looing for cheap Sportsters they can chop.
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