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Discussion Starter #1
1985 K100RS will not start.
A. Engine turns over
B. New gas in tank
C. Removed spark plug one at a time. Ground plug on frame appears to be a good spark. All four plugs have spark.
D. When I removed plugs they were damp so I presume they are getting gas.

Please help it is driving me crazy. Please explain course of action I should take in detail because I am not a Master Mechanic.

Thanks you Guys

Ray
 

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Just some stuff to get started with:

You might try a new set of plugs.
Make sure the battery is fully charged.
Unseat and reseat the main computer connector under the left side panel.
I have had the injector pintle pins stick after sitting a long time.
I have had the engine water temp sensor fail- gas was shooting out of the exhaust.

Nothing else comes to mind right now.
Has the bike been sitting for a long time?

Frank
 

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I would make sure you are getting gas. I have been fooled a few times by damp plugs on my K100. The plugs are damp but the fuel pump isnt firing.

Listen for the fuel pump firing. You should hear it when you hit the starter. If you dont hear it, check the round connector on the left front bottom of the tank. If you are not sure, you can do one of two things. Remove the pump, run some leads from a battery to the pump. It hasnt mattered about positive or negative on mine for testing; reversing the leads makes the pump spin in the other direction. The pump should fire. Another method is to pull one fuel injector out, put it in a large glass, hit the starter and look to see if gas sprays out the injector.

Also try starting the mc with the clutch pulled in. There must be neutral sensor somewhere. I havent dealt with that on my K100, but on some mcs failure results in the starter turning but the engine not firing.
 

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I thought of an easier way to tell if the fuel pump is working. Remove the gas cap. This is easy. Open the cap. Take out the screws you see. The unit will lift out. Reach in and touch the fuel pump with one hand. Hit the starter with the other. You should feel the pump vibrating if it is running.

I pulled my pump a few times because I needed to find out if the pump had failed, the connectors on the harness were bad or if the electronic component that sends the signal had failed. In my case, the pump tested fine. The connectors had worn on the harness. I cut off the old connector and spliced on a used one.

Removing the pump is not complicated. Frustrating and dirty. I can talk you thru it if it comes to that.
 
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