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I picked up a used 2017 CB500F with 4,000 km on it. Loving it thus far; it's so much more refined than my previous CBR250R.

However, I've noticed an odd thing. When the kickstand is down and the bike is in neutral, the engine will turn over but won't start. Straightening the bike but leaving the kickstand down, it still won't start. Put the stand up, and it turns over once and starts every time like clockwork.

This isn't a problem on its own, but it's got me concerned that there might be something wrong with the kickstand sensor or the electronics which could cause more serious problems down the road, which with my luck would mean at highway speed.
 

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That seems odd. Try the kickstand UP, and attempt to lean the bike over close to it's original angle when on it's stand. If it starts, then you have probably eliminated that gremlin. I'd look for something loose at the Kickstand, it's switch, wiring, etc. If nothing, disconnect and try a jumper wire across the switche's connector, to by pass the switch. This is nothing more than a process of elimination, and hopefully, you find the switch or connector is bad. They're not terribly expensive, and should be fairly easy to replace. There's a link below for your bike's switch. Good Luck.
https://www.partzilla.com/catalog/honda/motorcycle/2017/cb500f-ac-cb500f/side-stand
 

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I had the same problem. I isolated the problem to the neutral sensor. I bought a new one from Amazon and replaced myself. It is very easy to do. The original part number is 35600-MK4-860.
 

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It should start with the kickstand down if it's in neutral. You shouldn't need to disengage the clutch if it's in neutral.
 
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