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1980 GS850GL kinda rebuilding one bolt at a time.

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Some things I've noticed while riding after the carb tune up (that is still in progress) I rarely turn my wrist more than 1/4 a turn on the throttle...even starting after an intersection. I had to be on a 80 mph freeway to open the throttle even 3/4 full.. Maybe I'm a pansy but I don't feel the need to dart about with a wide open throttle or revving the bike to make noise. I enjoy cruising at 40-60 mph.. and while cruising at 60 my throttle is only about 1/2 open.... SO... I've come to the conclusion the most of my problems are in the slow circuit... I will do some more work to diagnose performance..
 
Interesting discovery while I've been playing with the mixture screws... I found a frayed wire on the 12 volt wires leading to my coils that may have been causing intermittent firing of #1 and #4... So, I have replaced the connectors with my infamous waterproof marine connectors.. which I'm getting MUCH better at installing correctly the first time... (grin)
 
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Coming up on 10 months since the last installment here. Some health problems slowed me down along with some electrical problems that I couldn't solve. Turned out that I had some faulty connections that were shorting out the trigger wires to the coils... Replaced coils, replaced wires, rechecked all connections and went for a ride today... Seems everything is working. Yay. I was going to document a lot more than I ended up taking pictures of. But I have learned a bunch about my troubleshooting skills. But a good ride (first in a long time) was fun....
 
sigh. Finally got over 38mpg ...but while riding home after 200 miles it started coughing and sputtering... limped home and it's only firing on 3 cyl. did the old take of each spark plug check, and the one that's missing is #1. Checked compression 122 PSI (within 5 PSI of the other 3) spark plug is wet but is sparking.... ... sigh
 
Has anyone every had a sparkplug break/quit working in mid ride? Swapped out the #1 plug with a cleaned used one I had around and everything is great. Finally getting about 42mpg on my ride today.. First time it's been that good in 8 years. Thanks for everyone's help on this.
 
Uncamitzi said:
Has anyone every had a sparkplug break/quit working in mid ride? Swapped out the #1 plug with a cleaned used one I had around and everything is great. Finally getting about 42mpg on my ride today.. First time it's been that good in 8 years. Thanks for everyone's help on this.
Click to expand...
If it happens again on that cylinder, replace the spark plug cap (assuming you haven't done that recently). I've never had a plug fail, but caps have crapped out on me a couple of times.
 
New caps last year.. saved the old ones and tested their continuity and resistance and they are all fine.. It's probably more of a valve problem. Compression is near the lowest passable on 1 and 4 cyls and valve seats probably need to be addressed on a 40 year old engine... so there's that too.
RichDesmond said:
If it happens again on that cylinder, replace the spark plug cap (assuming you haven't done that recently). I've never had a plug fail, but caps have crapped out on me a couple of times.
Click to expand...
 
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