Transmission Switch question

[Lbxpdx]

After a heavy rain while parked outside,  I noticed my my shift indicator started to act up.  It shows neutral in 1st, neutral and 2nd, 3rd and 4th are fine and 5th shows it is in 4th gear.  I cleaned the connection next to the tank with deoxit and the indicator on the instrument cluster shows the proper gears when grounded, which makes me think it is the actual switch.  It sat for a month in the garage and I rode all day Saturday with no change.  Is it safe to assume that I need a new switch?

[The Mighty Gryphon]

I would clean and re-pot the switch.  The potting compound that was used is some kind of waxy stuff that degrades after 30 years and lets water in. 

I have rebuilt several switches now and they all work well. 

First dig out all the old potting, then carefully disassemble the switch.  There are several tiny springs and contacts that you don't want to lose.  If you take your time and work in a clean area the job isn't too bad.

When the switch is clean, repot it with epoxy resin.  Avoid the 5 minute stuff, you want it to have time to flow into all the wiring.  After a couple days and the epoxy is fully cured wrap the switch with a layers of self amalgamating tape to seal the joint around the switch.

When you put the switch back, use Allen screws to attach it.  They are a lot easier to get in and out.

[Lbxpdx]

Thanks.  Any idea on how long it takes to get at it?

[rbm]

if it's your first time at trying to remove and replace the rear swing arm, then allow a good day to remove and replace.  If you're a proficient mechanic, then half that time.  Do a plan relube while you have it apart.

[Lbxpdx]

Well, a month later and it would appear on the first warm 60 degree day that it has cleared itself up.  Would you suggest a smear of something around the grommet to keep moisture out or leave it alone and look at it when its time to grease the splines?

[Scott_]

That's your gamble.
It has shown signs now that it is no longer sealed moisture tight.
How long till you anticipate a spline lube?
How long will it take more moisture to start corrosion?
If you wait too long, you might just as well plan to replace it as it may not be repairable by then.