yamaha fzs fazer strating problems

[reggae123]

hi guys still having problems starting my bike changed the batt changed the spark plugs one minite it can be ok ie starts in the morinig drive to wrk but then park up turn off ten minites later takes about 10 attemps to start and some times only starts with a bit of throttle could it be the starter relay http://www.ebay.co.uk/itm/261022655978?s...1438.l2648 thanks i dont want to keep throwing money at it ahhhhhh

[BBROWN1664]

No. Wouldn't turn over if it was that. Open the filler cap. If it hisses it's a kinked breather tube.

[Fazerider]

If the engine is getting spun by the starter motor but not firing, it's not the starter relay that's at fault.


If the starter motor isn't turning the engine over then yes, possibly. It could also be a lot of other things such as a dodgy killswitch or sidestand cut-out, poor connections or a duff battery.

[rustyrider]

If it was the killswitch or sidestand switch, it still wouldn't turn over on the starter.  If it turns over but won't start it's lack of fuel (very unlikely on a engine fitted with carbs) or lack of sparks.  Does it have an alarm/immobiliser fitted?

[reggae123]

hi no it dosent have alarm or emobilzer fitted

[reggae123]

kinked breather tube ?? sorry i am abouts as machanical minded as a bowl of fruit

[BBROWN1664]

When you next struggle to start the bike, open the fuel filler carefully and listen. If you hear a hiss it is because here is a vacuum in the tank.

Has he tank been lifted recently? One of the rubber hoses connected to it let's air in to prevent a vacuum, another feeds fuel to the carbs.

[BBROWN1664]

Also, where in the country are you? Some helpful Foccer may be nearby.

[reggae123]

there are two small hoses conrcted to under the tank what shall i do with these taken them off then refit or ?

[BBROWN1664]

Are you getting the hiss?

[reggae123]

havent looked yet if i hear hiss what do u rekonmend i do with the to tubes under tank

[BBROWN1664]

lift the tank carefully and then lower it again making sure that the pipes are not kinked. Dont pull them off, one feed petrol to the carbs.

You will probably find after opening the cap, if you get the hiss, that the bike will start anyway but you should sort out the pipes.

[Dead Eye]

Just to clarify, shouldn't there be THREE pipes connected to the underneath of the tank?

One provides fuel to the fuel pump and on to the carbs - this one is connected to the tap underneath the tank.

There are then two small breather hoses. One is as you described to allow air into the tank to prevent a vacuum and the other is for fuel over-fill and water drainage.

Pretty sure thats correct, but feel free to correct me if im wrong.

[Fazerider]

DeadEye is correct.
However, I feel we may be wandering up a blind alley here. A blocked breather causing a vacuum in the tank would be likely to starve the bike of fuel when running, not cause starting problems.
It would be good to know what the symptoms are.
You started this thread by asking whether the starter relay could be to blame... is that because it isn't turning the engine over? If so, we're looking for an electrical problem.
If, on the other hand, the engine spins on the starter and doesn't fire we're looking for something else. Reluctance to fire up when hot is often due to too rich a mixture caused by a clogged air filter or the owner employing the choke lever unnecessarily, for example.

[reggae123]

the engine truns over fine i cheked the air filter and thats not blocked bloody bike doing my head in now

[akula]

I'm having exactly the same issue. Im not on the bike every day but seems to be coming and going. No one seems to be able to properly diagnose this issue

[Fazerider]

I'd take it for a spin to get it warmed up then let it idle for a couple of minutes.
Switch off and, once it's cool enough, check the plugs (the idea being to see if the bike's running rich when the throttle is closed).
If some are sooty it'll point to a carburettor problem: possibly a faulty choke plunger or slow-running needle/jets that need adjustment. If that is the case I'd recommend you take it to a qualified mechanic: inexpert fiddling with carbs can easily convert them from "almost OK" to useless.