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1980 gs850gl compression test
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1980 gs850gl compression test
I have a dumb question when doing a compression test on 1980 gs850 do you need to ground spark plug wires ?Tags: None
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mnferwerda
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Forum LongTimerGSResource Superstar
Past Site Supporter
Super Site Supporter- Mar 2006
- 35640
- Torrance, CA
It's generally advised to ground them. The ignitors typically tolerate an ungrounded plug but it won't hurt to hedge your bet.
Before doing a compression test is critical to adjust the valves and put some miles on the bike. Bikes that have sat in long term storage may have sticky rings that loosen up quickly once the bike enters service. And since the valves tighten with mileage, and so many people don't adjust them, it's critical to make sure that is done before hand. Also, the engine needs to be hot and the throttle held open during compression testing.Ed
To measure is to know.
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Originally posted by Nessism View PostIt's generally advised to ground them. The ignitors typically tolerate an ungrounded plug but it won't hurt to hedge your bet.
Maybe there is something about it that I don't know.
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mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
#1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
#2 son: 1980 GS1000G
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Mom's first ride
Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
(Click on my username in the upper-left corner for e-mail info.)
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Forum LongTimerGSResource Superstar
Past Site Supporter
Super Site Supporter- Mar 2006
- 35640
- Torrance, CA
Originally posted by Steve View PostYou have experience with that, Ed? The "ignitor" is just a box of transistors that interrupt current flow through the coils. Whether the coil output is grounded shouldn't affect the load through the ignitor.
Maybe there is something about it that I don't know.
.Ed
To measure is to know.
Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182
Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846
Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf
KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection
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This question is interesting. I take the view that if high voltage finds route 1 is not available it will look for an alternate and that could be undesirable.
I have heard advice about modern cars that this could damage the ecu.
On balance I would disconnect the coils if only to prevent zapping myself.97 R1100R
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80 GS850G, 79 Z400B, 85 R100RT, 80 Z650D, 76 CB200
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Originally posted by Nessism View PostSteve, If you are 100% sure that the plugs don't need to be grounded I defer to your knowledge. I was a little unsure so I take and recommend the conservative approach.
It certainly would not hurt anything to ground them, but now I wonder if something nasty might happen if you don't.
Hey, Posplayr, you have any input on this?
.sigpic
mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
#1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
#2 son: 1980 GS1000G
Family Portrait
Siblings and Spouses
Mom's first ride
Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
(Click on my username in the upper-left corner for e-mail info.)
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