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this happens early in the morning, recently i had to start with pulling clutch even it wasn't on a gear. sometimes i had to fold side stand
but now its not starting at all....
now i have to push and put it on a gear...

is it a battery problem? or rectifier? or something else?
should i check my battery with a multimeter?

Thanks

update:
checked the battery without starting the engine(still it doesn't )... multimeter reads 12.5-12.6v
looks battery ok?!

Battery looks ok. Not perfect, but good. What are you experiencing? Try to be more specific. Does the starter turn ok, like previously? If starter cranks the engine, then you should check three more things: air, fuel, spark. Spark might be compromised due to humidity. It's also colder, so you should use choke properly, adjusting to more rich a/f ratio.
Try to give more details and i am sure yoi will get more tips and hints to diagnose the problem.

_________________
Honda Hornet CB600F 1999
Honda Hornet CB600F 2005

As Xmixerx says there are various reasons that stop a bike from starting - Xmixerx mentioned fuelling - I'll mention electrics:

It could be a switch issue - specifically:

The clutch switch
The neutral switch
The sidestand switch.

If any of these are dirty or the wire is damaged/corroded this will result in intermittent and eventually no circuit/contact.

You need to test each switch one by one to isolate and locate the problem switch.

The clutch switch allows you to start the bike in gear or if the neutral switch has failed so this is the logical place to start testing your switches:

Test your clutch switch by putting the sidestand up and putting the bike in gear - then pull in the clutch and press the starter - if the bike starts your clutch switch is fine* if the bike does not start you can clean/replace the clutch switch.

*If the clutch switch is fine then test your sidestand switch - if this is ok the problem could be with the neutral switch.

update: today i noticed something unusual, you tell me
i started the bike using a screwdriver, you know you can put it between two wires connected to main fuse
so then...
when bike is idle, i see multimeter reads 14.6v+ but when i rev engine it goes down a bit... like 14.1 or 13.9v
its not normal, right?

as you requested more info, here you go
when i say not starting.. its not cranking the engine, its just neutral bulb heat bulb parkings only, no sound at all
imagine you have kill switch on.. that's how it is
(when you pushing ignition switch while have kill switch on, you can clearly notice that your dash/meter board bulbs do not blink)

But when i push ignition those bulbs blinks, may be its indicating you have less power to ignite? or less CCA in battery?

mine gives No ignition
when kill switch off+pulled clutch+folded side stand

BUT... imagine i got it some how started and done few Kms.. then i may ignite without pulling clutch or folding side stand
it means i have no issue with clutch switch or side stand switch, right?
hot engine solves everything?!

cheers

Ok - before we get into more complicated stuff like fuelling is the problem located in the starter button switch?

I had this problem on my CBR - I pressed the starter button and the neutral/oil light etc would come on but the starter motor was silent.

Eventually after a few prods of the starter button the bike started fine - after the bike had warmed up there was no problem with the starter button - if I stopped for fuel the bike would start fine on a warmed up engine/electrical system.

However I was lazy and didn't investigate the problem - until it got much worse and the bike did not start at all on the button.

After taking apart the right hand starter/killl switch handlebar cluster and cleaning the switch contact with contact cleaner the bike starts on the button every time.

So maybe you simply have a dirty starter button switch?

same here
lemme see and update

Hope it solves the problem.

At this stage it seems to be purely electrical problem. Cranking the engine to be precise. As hoon98 said, check the circuit is closed (he mentioned all the switches). Also check the starting button. Be sure, that the connections on the battery and staryer motor are tight. Droping voltage when reving up is normal though. It could also be that starter motor brushes are going to an end. It's rare but you should also consider it. Usualy your symptoms indicate a bad connection in starting circuit.

_________________
Honda Hornet CB600F 1999
Honda Hornet CB600F 2005

jooc, could it be a solenoid switch issue??

So I guess cleaning the starter switch didn't work?

Nope... perhaps cleaning side stand switch and changing clutch?
but some how i can start in the morning but i have to pull clutch and side stand should be folded

Yeah - give the clutch switch a clean - see if that fixes it - if not move onto the sidestand switch - and after that you've got the neutral switch.

Problem Solved, it was side stand switch AND ignition switch
now i can start right after key is ON, in the morning, day, night no problem... just like it should be
cheers!

Excellent - was the problem due to dirty wiring connectors?

yeah corroded, i remember i never had a chance to start the bike just pushing ignition switch. everytime i had to fold sidestand, pull clutch the push ignition

Good work - happy you got it sorted