Hi, I am working on a GS1100E (1982). The bike belonged to a buddy and was parked for like 25 years. 48,000 kilometers. I decided to get it running better but no matter what I do, # 4 cylinder runs way cooler than the other three. I have gone through the carbs for the third time. I have a manometer to sync the carbs with and did so. First the idle mixture screws were set to 3 1/2 turns out and the highest idle was achieved. Then the sync was done. The valves were set to .004. The compression test is #1 -105, #2 - 103, #3 - 102, #4 - 114.
The ohm check for the coils checked out OK both the primary ( 200 scale = 4.3 ohms on both coils) and secondary ( 200 K scale = 22.1 and 20...with the new NGK spark plug boots in place.) The STD passed too.
New NGK spark plug boots and spark plugs were installed. The coils were reversed and #4 stays cooler. Number 4 plug is just slightly damper than the other three spark plugs - (which are all the perfect colour.) When #1/3 coil was accidentally left disconnected - the bike started and ran fine on just #1 and 4 until #4 spark plug wire was removed and the engine stumbled down and ran on just #1 and recovered when #4 was reattached. So if it's working why is the #4 exhaust header showing 100 degrees F when the other three are showing 300 degrees F ? That is my question. The bike runs out quite nicely on the highway and pulls strong. I am thinking I might try the GM V-6 coil installation, increase the gap and see if that sorts it out, but I am not entirely optimistic it will.
The ohm check for the coils checked out OK both the primary ( 200 scale = 4.3 ohms on both coils) and secondary ( 200 K scale = 22.1 and 20...with the new NGK spark plug boots in place.) The STD passed too.
New NGK spark plug boots and spark plugs were installed. The coils were reversed and #4 stays cooler. Number 4 plug is just slightly damper than the other three spark plugs - (which are all the perfect colour.) When #1/3 coil was accidentally left disconnected - the bike started and ran fine on just #1 and 4 until #4 spark plug wire was removed and the engine stumbled down and ran on just #1 and recovered when #4 was reattached. So if it's working why is the #4 exhaust header showing 100 degrees F when the other three are showing 300 degrees F ? That is my question. The bike runs out quite nicely on the highway and pulls strong. I am thinking I might try the GM V-6 coil installation, increase the gap and see if that sorts it out, but I am not entirely optimistic it will.
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