1978 Gl1000 almost ready to give up. Help


Information and questions on GL1000 Goldwings (1975-1979)
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Kbkc2002
Posts: 14
Joined: Fri Apr 17, 2020 8:33 am
Location: Tremonton, Utah
Motorcycle: 1978 Honda Goldwing GL1000

1978 Gl1000 almost ready to give up. Help

Post by Kbkc2002 »



I have been working on my 1978 honda goldwing
Final finished putting new gaskets throughout the engine and resurfaced the heads. Reseated the valves put it back together and did a compression test.
Cylinders 1 & 3 years 150
Cylinder 2 120
Cylinder 4 30
Please help I have no idea what I have done wrong


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winguyjo
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Motorcycle: wing1 : 1982 gl1100 interstate; resurrection complete. SOLD
wing2 : 1980 gl1100 interstate; resurrection complete. SOLD.
wing3 : 81gl1100i frame/82gl1100a engine/81cb900 bits. resurrection complete. naked. SOLD.
wing4 : 1977 gl1000 black w/ blue pinstripes; resurrection complete. SOLD
wing5 : 1977 gl1000 black w/gold pinstripes; nearly roadworthy when purchased, NOW RIDING.
wing6 : 1975 gl1000 blue; SOLD

Re: 1978 Gl1000 almost ready to give up. Help

Post by winguyjo »

ouch, that's gotta hurt after doing all that work. you say you "re-seated" the valves ... can i assume that means you lapped them ? if so, have you checked the valve lash ? if so,

my next move would be to find out where the compression is going on number 4. a leakdown test will tell.
Kbkc2002
Posts: 14
Joined: Fri Apr 17, 2020 8:33 am
Location: Tremonton, Utah
Motorcycle: 1978 Honda Goldwing GL1000

Re: 1978 Gl1000 almost ready to give up. Help

Post by Kbkc2002 »

I did lap them, I am a little green when it comes to leakdown tests. How is thqt done.
Thanks for the help
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Rambozo
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Motorcycle: 1992 GL1500 Aspencade

Re: 1978 Gl1000 almost ready to give up. Help

Post by Rambozo »

Bring the cylinder up to TDC, pump air into the cylinder through the spark plug hole. There is a tool with a gauge that will tell you the actual leakage, but even without that, you can locate where the air is coming out to identify the problem area. Listen at the intake, to check the intake valve, the exhaust to check the exhaust valve, the crankcase to check the rings, the radiator to check for gasket or block/head failures.
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winguyjo
Posts: 413
Joined: Sat Aug 11, 2018 9:26 pm
Location: b.c. Canada
Motorcycle: wing1 : 1982 gl1100 interstate; resurrection complete. SOLD
wing2 : 1980 gl1100 interstate; resurrection complete. SOLD.
wing3 : 81gl1100i frame/82gl1100a engine/81cb900 bits. resurrection complete. naked. SOLD.
wing4 : 1977 gl1000 black w/ blue pinstripes; resurrection complete. SOLD
wing5 : 1977 gl1000 black w/gold pinstripes; nearly roadworthy when purchased, NOW RIDING.
wing6 : 1975 gl1000 blue; SOLD

Re: 1978 Gl1000 almost ready to give up. Help

Post by winguyjo »

if you have any trouble running a leakdown test, youtube is an excellent resource. the tool itself will cost you some $$ but if working on internal combustions is going to be your hobby, it's a well worth the investment. on youtube you can even learn how to put one together from bits and pieces if you have a decent hoard going on :oops: .
Kbkc2002
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Joined: Fri Apr 17, 2020 8:33 am
Location: Tremonton, Utah
Motorcycle: 1978 Honda Goldwing GL1000

Re: 1978 Gl1000 almost ready to give up. Help

Post by Kbkc2002 »

Thank you for your help
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landisr
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Location: Gilbert, AZ
Motorcycle: 1976 GL1000
1976 GL1000LTD
1994 GL1500A

Re: 1978 Gl1000 almost ready to give up. Help

Post by landisr »

Auto Zone or O Reillys might have them to 'loan'.

Ron in AZ
I'm not so sure about an inner child, but I have an inner idiot that surfaces every now and then.. :mrgreen:
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landisr
Posts: 787
Joined: Tue Jul 28, 2009 12:18 pm
Location: Gilbert, AZ
Motorcycle: 1976 GL1000
1976 GL1000LTD
1994 GL1500A

Re: 1978 Gl1000 almost ready to give up. Help

Post by landisr »

Auto Zone or O Reillys might have them to 'loan'.

Ron in AZ
I'm not so sure about an inner child, but I have an inner idiot that surfaces every now and then.. :mrgreen:
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DenverWinger
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1980 GL1100 STD Vetter (2005-)
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1972 CL350 (1980-1988) sold
1978 Suzuki GS550 (1985-2005) sold
1977 GL1000 (2002-2006) sold

Re: 1978 Gl1000 almost ready to give up. Help

Post by DenverWinger »

Easy enough to make one if you or a buddy has a welder, I took an old sparkplug, smashed the porcelain guts out of it and welded the metal sparkplug shell to the end of a short piece of pipe. then welded an air hose chuck fitting to the other end.


When you bring a cylinder up to TDC, if it won't hold any pressure at all you probably have the "wrong" TDC (between intake/exhaust strokes). Rotate the crank one full rev and bring up to TDC again, this should be top of the compression/power stroke.
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark
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Rambozo
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Motorcycle: 1992 GL1500 Aspencade

Re: 1978 Gl1000 almost ready to give up. Help

Post by Rambozo »

You can also often use the hose from your compression tester. Just remove the schrader valve in the end, so air can flow the other way.


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