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Difficult to start in hot/humid conditions

2.4K views 4 replies 3 participants last post by  itsjonduhh  
#1 ·
I've had my 500f for over a year now but lately it's been having trouble starting on a full or non-full tank.

I can't find much of a commonality between conditions other than humidity might be the biggest environmental issue.

I'll hit the starter for 6-7 seconds at a time to no avail. Sometimes hitting the killswitch off/on works after a few tries. Yesterday putting the kickstand up worked the first try.

Sometimes it starts up like normal hot or cold, other times it doesn't.

Could anyone shed some light on how these factors could contribute?

Summer fuel
Humidity
Too hot (in the sun?)
Kickstand switch

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#2 ·
No idea why or what, but if you haven't been using a fuel system additive,
I would add some Sea Foam to the gas tank, at the recommended amount (1 oz per gal).
There may be some water in the system or deposits that the additive can solve.
A couple of tanks and if the problem isn't solved, then it didn't help.

Ride safely
 
#4 ·
I would try some things to see if I could isolate what the issue could be.

There are a few ways in which the bike could be started, so try each deliberately and specifically, making mental notes...

1. Sidestand down, in Neutral, cluch lever out
2. Sidestand down, in Neutral, clutch lever in
3. Sidestand up, in Neutral, cluch lever out
4. Sidestand up, in Neutral, clutch lever in
5. Sidestand down, in gear, clutch lever in

What can you learn from this? Well, if the bike has trouble starting only with the side stand down, then there could be a connection problem with the side stand safety switch or switch malfunction. If the bike only has trouble starting in Neutral with the clutch lever out, then there could be an issue with the Neutral safety switch. If the bike only starts or starts easier with the clutch lever pulled in, that could indicate a weak battery and the increased drag could be affecting the speed the starter spins the engine, or a problem with the Neutral safety switch.

With all of that said, also try giving your bike a shake side-to-side before turning on the key. If there is any water deposits in your fuel, they will settle to the bottom, and will be first sucked in by the pump. Water doesn't ignite, so your bike won't start until you get fuel in there. Try to keep fresh fuel in your bike. 87 U.S. pump octane #.

I would also consider having the battery load tested. Even at a year old, these small motorcycle batteries can go bad. 3 years is about average.

Good luck!
 
#5 ·
thank you! over the weekend i tried a couple times to re-create the issue (wasn't too hard).

when sidestand is down and in neutral (my normal starting routine) it had a tough/non-existent time starting.

once i pull in the clutch, there was no issue.

2/2 times with the kickstand up, clutch lever in it started up immediately.

will keep trying the other options to narrow it down. thanks again!