GL1000 compression


Information and questions on GL1000 Goldwings (1975-1979)
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g&kengines
Posts: 3
Joined: Fri Apr 22, 2016 5:28 pm
Location: New Ulm, Mn.
Motorcycle: 1977 GL1000 2001 FLST 2002 VT750C

GL1000 compression

Post by g&kengines »



I still have that 1978 GL1000 with low comp. 50lbs. and less on all 4 Leak down is less than 10% It makes no sense. Redid the heads and still the problem. Split the motor, measured every thing, all good. Refinished cylinders and install new rings. Still at 50lbs or less. It is a total stock motor. Belts and pulleys all good, only 14000 miles on the bike. Started to check valve timing, intake starts to open @ 52 degrees BTDC and closes @95 degrees ABDC which is way off. Should the timing be checked at a certain amount of lift? Intake should be open for 220 degrees and this is open 327 degrees at 0 lash. What am I missing? Thanks


sfruechte
Posts: 219
Joined: Tue Mar 09, 2010 12:53 pm
Location: La Crosse, WI
Motorcycle: 1977 GL1000

Re: GL1000 compression

Post by sfruechte »

Check your valve clearances.
Compression is usually checked with throttle wide open. Not sure if there is a way to ensure constant velocity carbs are open? Is your air cleaner clean? Any other intake obstructions?
g&kengines
Posts: 3
Joined: Fri Apr 22, 2016 5:28 pm
Location: New Ulm, Mn.
Motorcycle: 1977 GL1000 2001 FLST 2002 VT750C

Re: GL1000 compression

Post by g&kengines »

Thank-you Clearance is set at .004 Carbs and intakes are removed, so plenty of air available. I degreed the crank shaft to check markings and all are dead on. It's this valve timing I'm having to question. Intake is suppose to be 5 Degrees BTDC and should close at 35 degrees ABDC I have 42 degrees BTDC and 95 degrees ABDC AT .030 lift on valve the numbers come into perspective. I don't know how the valve timing is to be checked or tested. Should it be at 0 lash or should there be some pressure on valve train. Like Harley Davidson is checked at .050 lift and I can't find info for the Honda Thank-you
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