'77 running badly - max speed 80mph


Information and questions on GL1000 Goldwings (1975-1979)
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Duq_
Posts: 11
Joined: Fri Mar 25, 2011 8:52 am
Location: Ireland
Motorcycle: 1977 GL1000
1984 GL1200 (naked)
NSS-250 Forza

'77 running badly - max speed 80mph

Postby Duq_ » Mon Jun 24, 2013 4:38 pm



Hi all,

My 1977 Wing is a bit poorly... She starts and runs on all 4, mostly. When it's cold she backfires a bit for the first few minutes - a sort of coughing sound from the air box. Accelerating is ok, but at a constant speed there's a rumble as if not all cylinders are firing all the time. On the motorway I can't get above 80mph any more.
I've started checking the electrics and comparing my readings to the values at Randakks site (http://www.randakksblog.com/coil-testin ... t-options/) I'm surprised she runs at all!
My plug caps are LB10F instead of LB05F but they measure 8.7k (3 of them) and 9.1k. The coils should be 14.250 but are 18.9 and 19.8.

So my questions: What would be the effect of too much resistance in the system? Are those values bad enough that I should start looking for new coils and caps?



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virgilmobile
Posts: 7660
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
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Re: '77 running badly - max speed 80mph

Postby virgilmobile » Tue Jun 25, 2013 8:59 am

Before you replace anything,do a "tune up".
You know,adjust the valves,set the timing correctly (split the difference method),sync the carbs,etc etc.
Then you can get into replacing old parts as necessary.

Duq_
Posts: 11
Joined: Fri Mar 25, 2011 8:52 am
Location: Ireland
Motorcycle: 1977 GL1000
1984 GL1200 (naked)
NSS-250 Forza

Re: '77 running badly - max speed 80mph

Postby Duq_ » Tue Jun 25, 2013 6:25 pm

I'm planning to do a tune-up this weekend but I'm curious to learn more about the effect of the variation in the electrical components.

In another topic I read:
"Make sure your fuel cap is venting properly or it won't allow air into your tank so the fuel can go out."

But my petrol tank today had over-pressure; when I lifted the filler cap after riding home it blew out air, it didn't suck any in. How could that happen?

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virgilmobile
Posts: 7660
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: '77 running badly - max speed 80mph

Postby virgilmobile » Tue Jun 25, 2013 7:22 pm

All the wing gas caps are vented one way.Air in,no fumes out.
As the day gets warmer,gas expands creating tank pressure.Its common and normal.It has no adverse affects.
If the gas cap valve is bad,a vacuum can develope in the tank and starve the fuel pump.Taking off the cap,you would hear a sucking sound,not a pressure release and the fumes.

User avatar
virgilmobile
Posts: 7660
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: '77 running badly - max speed 80mph

Postby virgilmobile » Tue Jun 25, 2013 7:30 pm

As far as the electrical...lets assume that your meter is accurate.yes I've seen DVM meters read inaccurate.i usually allow a 15% tolerance in readings before i call a part bad.
Only rocks (shamrocks) live forever.




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