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Old 04-13-2013, 02:56 PM   #121
8lives
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Old thread I know,but I want 1 of these bikes really bad!
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Old 07-14-2013, 07:07 AM   #122
mennleo
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Transmission vent

hey guys,

I have a 81' R80G/S that i have replaced whole front end with honda and am using front wheel for speedo. i want to plug old speedo hole in tranny but i think there should be some kind of vent. i tried to make a small plastic plug w o-rings but it seems to leak oil sometimes. tried removing speedo drive gear but that seemed to make worse. is there an oil orifice on drive gear that could be plugged? seems like only vent before was through speedo cable. there is a very small screw w fiber washer in top of tranny under airbox that i thought might work? i replaced all bearings and seals in tranny myself and it runs much smother.

as i understand fd has vent on top, drive shaft is vented through small hole above tranny output seal but then where is tranny vented???

thanks
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Old 07-14-2013, 07:32 AM   #123
AlpineRAM
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The tranny is venting through the hollow bolt that also holds the ground cable from the battery in stock form. You could use the old speedo cable without the interior and simply route it in a loop going back down.
I would be more concerned with water getting in than with oil getting out.
On my HPN it looks like this:

It still has the hollow bolt for the battery ground.

HTH

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Old 07-14-2013, 07:33 AM   #124
mendoje
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The battery cable bolt has a hole drilled in it, that is the gearbox vent. Also, dont remove that small screw on top of the gearbox, it holds a sheet metal plate to the inside/top of the gearbox. I believe if you remove that screw, the plate will fall into the inards, and you'll be taking the gearbox apart again.
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Old 07-14-2013, 05:28 PM   #125
mendoje
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Quote:
Originally Posted by mendoje View Post
Also, dont remove that small screw on top of the gearbox, it holds a sheet metal plate to the inside/top of the gearbox. I believe if you remove that screw, the plate will fall into the inards, and you'll be taking the gearbox apart again.
And here's a picture of that screw holding the plate (your own post mennleo, picture #5)...
http://www.advrider.com/forums/showp...9&postcount=32
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Old 07-14-2013, 10:49 PM   #126
mennleo
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Duh

Yes that photo shows it well. Thanks for the reminder.

Somewhere in the top of tranny seems like a better place to vent then that drilled bolt. Or machine a sealed plug for speedo drive, drill for vent, and use solid bolt.
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Old 07-14-2013, 10:55 PM   #127
mennleo
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Quote:
Originally Posted by AlpineRAM View Post
The tranny is venting through the hollow bolt that also holds the ground cable from the battery in stock form. You could use the old speedo cable without the interior and simply route it in a loop going back down.
I would be more concerned with water getting in than with oil getting out.
On my HPN it looks like this:

It still has the hollow bolt for the battery ground.

HTH

AlpineRAM
yes, can we see a better close up photo?? thx
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Old 07-17-2013, 04:23 PM   #128
AlpineRAM
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I'll try to post one tomorrow.
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Old 07-22-2013, 10:47 AM   #129
mennleo
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Transmission vent

so i put in a drilled bolt to hold ground cable and home made plastic plug. but when it gets hot after short ride it still pumps or burps out a lot of oil. i still have speedo drive gear in. and there seems to be a oil hole to lube that somehow. i wonder if the output bearing is not right? i think i put in one with seals on both sides. but i see from tear down pictures it did not have seal on back at least. may pull tranny and cover and have a closer look.

mennleo screwed with this post 07-22-2013 at 10:53 AM
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Old 07-26-2013, 10:54 PM   #130
mennleo
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pulled the tranny and took off the cover. only took about 2 hrs. removed seals from aft output bearing. that should help keep oil from building up behind the bearing. i think i will drill the top middle bolt in air box and try venting there. and plug speedo drive.
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Old 07-06-2014, 03:56 PM   #131
One Less Harley OP
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Intervalve failure at 26,000 miles

I did a complete valve job less than 26,000 miles ago. Well today the exhaust valve failed..

The first thing I noticed was oil at the exhaust pipe, sorry you can't see it well in the pict.



then upon further disassembly, oil at the carb intake boot.



and exhaust



...and damage to the spark plug...



but things get worse...



along with piston damage..



but no sign of the valve head, so I dropped the oil pan, and still no sign, just some metal from the piston??? So where could it have gone...hum maybe the exhaust pipe??? So I picked it up and out it rolled...






How do I determine what size piston I need as I'm not sure about the 1st and 2nd oversize designation??


I am in need of a right head for an R80 G/S, so if you have one or know where I can get one please let me know.
R80 from 1979-1987
casting # 1264569 R9
S1CO
280/4
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One Less Harley screwed with this post 07-06-2014 at 06:16 PM
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Old 07-06-2014, 04:29 PM   #132
ben2go
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Cry

That's painful to look at.I hope you can get her back together.
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Old 07-06-2014, 04:50 PM   #133
disston
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I suggest buying two pistons so they are matched. Of course that's just my opinion and I think many don't agree with me on this.

There are numbers stamped on the top of the pistons that say what size they are. If the numbers on the damaged piston are obliterated then they may be readable on the other piston.

It was a valve failure after only 26,000 miles on a fresh valve job? The other head has the same valves in it.

Tell me, you used Intervalves but what valve guides were used?
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Old 07-06-2014, 05:27 PM   #134
Skyshadow
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could someone smarter please tell me how this happened and why a while new head is needed? Did the valve shaft simply snap? Could the valve guides been too tight and with the summer heat just finally let go?

in any case...my condolences....it really sucks this had to happen
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Old 07-06-2014, 05:33 PM   #135
Cogswell
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That sucks man...

Hope you can find some spares.


Mike
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The good thing is, your damn motor can't read. If it says oil on the container, it's pretty much OK to dump in there.... ED.
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