850 Barn find is running!

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Hi Guys-

It's been a while since my last post regarding the '74 850 I brought back from Colorado in Oct. so I thought I would give an update. I read the forum almost daily but in working on this Commando everything was pretty straight forward so I didn't want to pester you guys ridiculous questions, (what wt. motor oil, size tires etc!).

Anyway after close to 20 years of this bike laying dormant I finally got it running today. At the beginning of all this I was pretty sure I would do a full restoration minus paint. The more I got into tearing the bike down the more I realized that a full re-do of everything was really not necessary. It was in such great shape. In fact several of my riding buddies told me I would be crazy to go OCD on it. The more I thought about it I came to the conclusion that it would only be original once and I should try to leave it that way. I'll let the next owner go nuts.

I did strip it down to the bare frame, cleaned and detailed every part on the bike. Lots of polishing. Brake rebuild, carb kits and overhaul, new ignition parts, fork seals and boots, oil lines etc. That shot of the wheel rim is exactly how it looked when I pulled the tire and rubber band off. Not a grain of rust. How often do you see that on a 38 year old bike? I did not tear the engine down. Just short of splitting the cases and pulling the heads I replaced every seal and gasket I could. When I drained all the fluids I was amazed at how clean and uncontaminated the oil was. I was told that the bike ran perfectly fine when parked but we've all heard that story! In this case I took a leap of faith and believed it. It sounds great.

I do have one issue though: While checking the timing with a strobe, fiddling with the air screws, idle screws etc. the bike was idling for approx 2-3 minutes. Suddenly oil started coming out of the area where the wires for the points run through the case up toward the harness. Not on the points side ( I replaced that seal) but the opposite side. When I pulled those wires through so I could get the timing cover off I did not notice and type of seal or grommet there which when reassembling I thought a bit odd. In fact I've just checked the Andover Norton exploded views for the timing cover and the engine cases again and do not see anything to seal that wiring off. It doesn't look like I'll make the Rock Store tomorrow with it. What did I miss?

Anyway, here are a few shots of the progress I went through:

850 Barn find is running!

Picked it up from CO. She still hasn't sold me that TR-3 yet!

850 Barn find is running!

After getting it home and a 30 minute cleaning. Could not wait to get those handlebars off

850 Barn find is running!

The tear down begins

850 Barn find is running!

850 Barn find is running!

850 Barn find is running!

I did not touch this rim with any cleaner whatsoever

850 Barn find is running!

Starting the reassembling process

850 Barn find is running!

850 Barn find is running!

850 Barn find is running!

850 Barn find is running!

And this is what it looks like today

850 Barn find is running!


850 Barn find is running!

And this is a shameless shot of me racing at Laguna Seca back in 1987 or 1988. This was a 750 Fastback I built from a basket case to run
in the Battle of the Twins and the AHRMA race that ran in conjunction with the Grand Prix that year. Not sure if anyone knows Mick Olfield
but he helped me with some engine and chassis work. That is a 650 Ninja front end! They were not happy with me in Tech inspection.
I disconnected the anti-dive and that made them feel better! :D
 
Nice job MiniMo and a bit of a Freddie Spencer look going on there in the race shot...

What grade of oil did you put in it?!!!!!!!!!!!!
 
Freddie Spencer look???? With a Wayne Gardiner helmet? Freddie was the best! And, wait for it...straight 40w.lol
 
Mini Mo said:
Suddenly oil started coming out of the area where the wires for the points run through the case up toward the harness. Not on the points side ( I replaced that seal) but the opposite side. When I pulled those wires through so I could get the timing cover off I did not notice and type of seal or grommet there which when reassembling I thought a bit odd. In fact I've just checked the Andover Norton exploded views for the timing cover and the engine cases again and do not see anything to seal that wiring off. It doesn't look like I'll make the Rock Store tomorrow with it. What did I miss?

The points wire gallery joint between the timing cover and crankcase should be sealed by the timing cover gasket (the wires pass through a hole in the gasket).

http://www.nortonmotors.de/ANIL/Norton% ... 004&Part=2
 
L.A.B. said:
Mini Mo said:
Suddenly oil started coming out of the area where the wires for the points run through the case up toward the harness. Not on the points side ( I replaced that seal) but the opposite side. When I pulled those wires through so I could get the timing cover off I did not notice and type of seal or grommet there which when reassembling I thought a bit odd. In fact I've just checked the Andover Norton exploded views for the timing cover and the engine cases again and do not see anything to seal that wiring off. It doesn't look like I'll make the Rock Store tomorrow with it. What did I miss?

The points wire gallery joint between the timing cover and crankcase should be sealed by the timing cover gasket (the wires pass through a hole in the gasket).

http://www.nortonmotors.de/ANIL/Norton% ... 004&Part=2

Look at item 17 - I just had a dog of a job getting the old one out of my barn find 850.
As LAB points out - the gasket is there to keep the oil back, and I assume this rubber is there to prevent water ingress.

Great rebuild, BTW - can't get enough of the sparkly colours!
 
Thanks for the replies back. So the #17 seal for the points wire in the diagram, which looks like a little piece of tubing, is in place but I have it in the timing cover only, where the wires come out for the points. Are you saying I should have bridged both the timing cover and the engine case with this seal? That would make sense.

850 Barn find is running!

The seal is just inside the cover where the wires come out

850 Barn find is running!

And this is where the oil is coming from
 
Mini Mo said:
Thanks for the replies back. So the #17 seal for the points wire in the diagram, which looks like a little piece of tubing, is in place but I have it in the timing cover only, where the wires come out for the points. Are you saying I should have bridged both the timing cover and the engine case with this seal? That would make sense.


No, as I already explained, the timing cover gasket should seal the area around the timing cover wire gallery.
 
Got it. Thanks. I can't understand what could have happened with that gasket though. It's brand new, can only be installed one way and I was super careful putting this back together. Guess the timing cover is coming back off today. Bummer
 
Mini Mo said:
I can't understand what could have happened with that gasket though. It's brand new, can only be installed one way and I was super careful putting this back together. Guess the timing cover is coming back off today.

Maybe you were sent the wrong (Atlas?) timing cover gasket?
 
Ordered from Duane at CS. Andover part # 061092 Timing Cover Gasket. That' what the invoice says but can I ask what the differences would be so when I do get it apart I know what I'm looking for?
 
If that is the only problem you experience then you are way ahead of most of us. When I first got my bike back on the road I think I had to take the carbs apart about 6 times before I got everything set up correctly and one of the biggest buggers was that it turned out that my pilot circuit was sucking air past the plug on intake side of the carb. I found it by accident when I could see carb cleaner spraying around the plug while trying to test the circuit for flow. The amount of frustration seems to only aid in the satisfaction when you finally get everything figured out.

The bike was a nice find. Good work!

Russ
 
I've run mine w/o any sealing tube through the cases and got no leaks via trigger leads. I'd supsect the cam seal is leaking and flooding the points area. Do Note that the TS cover gasket is part of the crush amount of the oil pump seal nipple which must be matched to the gasket thickness ordered. There are two combos of gasket/nipple that work right for this.
 
hobot said:
I've run mine w/o any sealing tube through the cases and got no leaks via trigger leads. I'd supsect the cam seal is leaking and flooding the points area. Do Note that the TS cover gasket is part of the crush amount of the oil pump seal nipple which must be matched to the gasket thickness ordered. There are two combos of gasket/nipple that work right for this.

Again, I replaced the cam seal. It is not leaking through the points side. Coming out where the wires go through the case, up to the main harness. I'll do as LAB suggests and check the timing cover gasket along with the nipple off the pump. It's just going to be a pain having to pull the points cam, oil lines, etc. Ugh.
 
Mini Mo said:
It's just going to be a pain having to pull the points cam, oil lines, etc. Ugh.
I wouldn't have a bike I didn't have to work on once in a while. That's what makes it all worth while, kind of like the clearing after the storm. Yin and yang and all.

Dave
69S
 
Well only path of oil to get out the wire path is to leak past the cam seal first, so excuse my bad logic to think about a nick on installing seal occurring. If cases cracked then whole 'nother issue of course and not likely. Some one may have screw driver levered off cover at some point to depress a spot oil can escape from TS sump into wire port. Trixie's new-ish cam seal don't seal perfectly so oil collects to drip out point cover drain hole some but none out along the wire path. I've rarely read of leak at this location so makes me think outside of the ordinary suggestions offed so far. Let us know what works or is found so we learn more.
 
OK besides oil fling from TS sump out a bad gasket seam or cover screw bore or cam seal or cracked cases what else have I missed? Could be fork oil blowing on the leads and draining down. Tach drive or front barrel leaks could show up on wires too but not just there only.
 
hobot said:
OK besides oil fling from TS sump out a bad gasket seam or cover screw bore or cam seal or cracked cases what else have I missed? Could be fork oil blowing on the leads and draining down. Tach drive or front barrel leaks could show up on wires too but not just there only.


"A bad gasket seam" isn't the "cam seal" then, is it?

You said:
Well only path of oil to get out the wire path is to leak past the cam seal first
 
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