I found a used neutral switch on ebay and fixed the problem, the old one stayed on because the plunger was stuck(rusted maybe) in the on position, once loose it did not work at all because the plunger stem was broke off at the housingNew member to Hondatwins & just seeing this thread now. Have 86 450 nighthawk & my neutral light will not go out as well. When you guys say "sending unit", I assume that's the console which has 4 lights (neutral, overdrive, high beams, other)? Also, it looks like Kennedy759 disregarded the "sending unit" test & replaced the "neutral light switch" on the top of the crankcase, right side? Kennedy759 - can you confirm what you did?
Yes....I see the neutral light switch sticking out (which the manual does NOT list/show) & I assume that's something to do with the neutral light. Problem: I'd replace it & be done with it but I don't see that part anywhere listed on a OEM site that I go to all the time to find part diagrahms / part #'s https://www.hondapartshouse.com/oemparts/l/hon/5053f724f870021c54be82b2/1986-cb450sc-a-parts