SOHC.co.uk Forums > CB650

strange starting problem

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kemp2368:

--- Quote from: notobikeparkingtax on June 27, 2010, 01:18:05 AM ---Do you normally leave the bike with the fuel tap turned off? Try leaving it in the ON or PRIME position and see if it starts easier.
Sounds to me like slight fuel starvation. Running up and down the gearbox will have no effect on starting, it will however give the float bowls a little extra time to fill up.

What happens if instead of going up and down the gears you just let it sit for a few seconds ?



--- End quote ---
hi there,it makes no diff if i leave fuel tap on or off,it only happens twice a week if i use it every day

kemp2368:

--- Quote from: Spitfire on June 27, 2010, 08:12:20 AM ---Sounds really strange this one, so the starter turns over but the engine does not fire as if the kill switch is in the off position, and a quick cycle through the gears resets it. Most peculier !

Cheers

Den

--- End quote ---
yes you have nailed the symptoms on the head,it is  like the kill switch being on,as it is at the moment i can put up with it,but its just a bit strange
i don't have a kill switch button at the mo as the button was not there when i got the bike

pae:
I wonder whether the neutral interlock is playing up, and running it up and down the gears shakes it back into life. Although you say the neutral light shows on when it's happening so possibly not, but maybe the light is OK but the interlock circuit isn't always breaking (or making, not sure which it does)...

Let me have a look at the manual and think about it.

When it next happens, put it into first gear, pull the clutch in, and see if it starts then.

kemp2368:
ok it happened when i  started it to come home from work ??? so when the neutral light still on i pulled the clutch in and she started 1st time :)
so does this mean the neutral interlock is playing up??

pae:
Could be, as pulling the clutch in should over-ride the "not in neutral" signal from the gear selector. So although your neutral light is on it seems that maybe the interlock thinks it ain't in neutral.

I still need to check the manual though as I'd have thought it's the same circuit and therefore both signals (whether right or wrong) should match.

Phil

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