Yamaha Fazer 600 suddenly no power

[Count Steer]

I'd be curious to know. Of the many electrical gremlins I've experienced,having a battery be the cause of a blown fuse isn't one.

It didnt blow any of the fuses on the bike as they were all tickety boo when i checked them ....... only on the charger when it was connected

Pulling too much current from the charger? Internal short in the battery? (Wouldn't draw too much on the bike as it wouldn't start). I'd have thought that would be evident when you checked the battery though.

[Bigyin]

Pulling too much current from the charger? Internal short in the battery? (Wouldn't draw too much on the bike as it wouldn't start). I'd have thought that would be evident when you checked the battery though.

I need to check the battery again as it wasnt me who did the initial check and i need to see the reading myself rather than being told by one of the others it was fine as i was on the road at the time he did it although i normally trust him

[Bigyin]

Right then bike electric gurus, explain this one to me.

Battery which was on the bike and when all connected gives sod all power and bike appears dead but on a test shows 12.75 V which is 0.05 off max power according to the manual

Battery which isnt the correct physical size but is fitted on the bike and when all connected it runs fine on a test shows 12.73 V

Brand new battery of the exact same type as the original arrived and fitted and bike starts up and runs normally and on test shows 12.73V straight from the box

All connections are the same and batteries swapped back to back between each other twice

How does a pretty much full power battery fail to power up the bike but a lower charge one does ?

[Count Steer]

It's possessed by evil spirits.

Can you test it by putting it under a significant load with something else? That seems to be the only thing left ie it's failing when you try to draw a big current. I suppose you can have a battery with a nominal 12v output but low actual capacity? Odd though, as you say, most batteries just cease to show a voltage.

[Bigyin]

Just to add insult I have just taken it for a quick blast and won’t pull over 5-6000 revs in gears 4,5 and 6. Manages 7000 in gears 1,2 and 3

Tells me it’s not just the battery so I assume the reg/rec is the next possible culprit apart from plugs and leads as that could have led to fucking the original battery

[Count Steer]

Just to add insult I have just taken it for a quick blast and won’t pull over 5-6000 revs in gears 4,5 and 6. Manages 7000 in gears 1,2 and 3

Tells me it’s not just the battery so I assume the reg/rec is the next possible culprit apart from plugs and leads as that could have led to fucking the original battery

When I was googling around re the original problem, the reg/rec cropped up frequently so I suspect you're homing in on the root cause....

[Le_Fromage_Grande]

Regulator failing wouldn't stop the bike revving out.
But low battery voltage might, as the igniter might not advance at lower voltages.

Your original battery has fucked cells.

[Bigyin]

Regulator failing wouldn't stop the bike revving out.
But low battery voltage might, as the igniter might not advance at lower voltages.

Your original battery has fucked cells.

It’s got a fully charged brand new battery in it but won’t rev out …….. would rev out last week with the old battery on board before the bike died

Just tested the new battery and it’s showing 12.95V after a brief run out when it was reading 12.73 V on installing so it isn’t low voltage

[iansoady]

A battery can show a reasonable voltage over the terminals but with no power behind it so as soon as a load is applied it is effectively dead. Caught me out once or twice.

[Bigyin]

Just ran it up on driveway with the new battery all connected and it shows 12.89 V on start up . Held at a steady 5000 rpm voltage climbs and stays at 14.14V so it’s not dropping, it’s where it should be.

According to the manual there is no test for the reg/rev so suggests swapping in a known good one as only way to see if the one on the bike is fecked….. might try and swap out one of the other ones at work as 2 others also have the same auld Fazers

Waiting till my bike project neighbour gets home then will take him a beer and some questions

[Yorick]

If it only revs till 7k, that'll be plenty fast enough for you

[wull]

The very fact that it’s holding a steady voltage when at 5k shows that the regulator rectifier is working fine. It’s job is to convert the AC voltage to DC voltage which it’s doing and to regulate the voltage which it is doing.

[wull]

I’d be looking at the coils or whatever set up the Fazer has with regards to ignition and test them, swap them out if you can take them from another bike.

[wull]

Another issue which I’ve seen causing problems with bikes not revving out is a problem with the timing. I had a problem where the CCT had failed causing the chain to stretch prematurely and it threw out the timing, I was getting fault codes at the time on my GSXR which pointed at the coils but the reason for the codes was the cam sensor wasn’t marrying up with the crank sensor.

[Mr. Dazzle]

Seems more likely to be an electrical thing cause it was sudden onset?

As above, voltages for batteries in isolation are only half an indication. Its perfectly possible to have the right voltage but as soon as you load the battery the voltage goes through the floor. Means the battery is fucked basically! But you've got brand new batts...

As your man says, if it's showing 14V consistently at different revs the reg/rec is probably OK. One of its jobs is to regulate the voltage coming from the charging system and it appears to be doing that? You could check and see if it goes higher than 14.14V above 5000rpm though, too high can be as bad as too low. Could even be what killed the last battery.

Struggling to rev out does suggest something wrong with the ignition system. Does it rev freely in neutral? The load on the engine makes a difference, hence why you could go higher revs in lower gears.

If it started all of a sudden that suggests something cracked/loose etc. Or, despite what I said above, the reg/rec. If it is getting the wrong voltage at certain engine speeds the ignition system will play up. Solid state electrics love nice steady voltages.

[Bigyin]

Seems more likely to be an electrical thing cause it was sudden onset?

As above, voltages for batteries in isolation are only half an indication. Its perfectly possible to have the right voltage but as soon as you load the battery the voltage goes through the floor. Means the battery is fucked basically! But you've got brand new batts...

As your man says, if it's showing 14V consistently at different revs the reg/rec is probably OK. One of its jobs is to regulate the voltage coming from the charging system and it appears to be doing that? You could check and see if it goes higher than 14.14V above 5000rpm though, too high can be as bad as too low. Could even be what killed the last battery.

Struggling to rev out does suggest something wrong with the ignition system. Does it rev freely in neutral? The load on the engine makes a difference, hence why you could go higher revs in lower gears.

If it started all of a sudden that suggests something cracked/loose etc. Or, despite what I said above, the reg/rec. If it is getting the wrong voltage at certain engine speeds the ignition system will play up. Solid state electrics love nice steady voltages.

Had everything apart today to check all connections. Even checked the airbox and filter as read on the owners forum of a similar one caused by a blocked air filter. On start up bike will rev freely to 9000-10000 revs much to the delight of my neighbours

Got some time over next couple of days to try a few things and probably get a service kit as well while its in bits

[Yorick]

Get it to a garage, you farking tight Sweaty

[Mr. Dazzle]

I'm minded to say it's an ignition problem, but....but the niggling thing is, your initial failure was everything dying right? Which suggests a more widespread electrical issue.

Bet it's a dodgy earth. When all else fails, blame a dodgy earth!

[Skub]

Just to add insult I have just taken it for a quick blast and won’t pull over 5-6000 revs in gears 4,5 and 6. Manages 7000 in gears 1,2 and 3

Tells me it’s not just the battery so I assume the reg/rec is the next possible culprit apart from plugs and leads as that could have led to fucking the original battery

Is the Frazer carbs or FI ?

If it's carbs,I recall a fault I had with one of my ZZR11s. It too would rev out when in neutral,but splutter at 7k revs on the road. I had that thing apart a million times. Turned out it was a loose needle on one of the carbs. I only spotted it because it had a shiny section worn on the body of the needle.

Worth checking if you are in there.

[Bigyin]

Is the Frazer carbs or FI ?

If it's carbs,I recall a fault I had with one of my ZZR11s. It too would rev out when in neutral,but splutter at 7k revs on the road. I had that thing apart a million times. Turned out it was a loose needle on one of the carbs. I only spotted it because it had a shiny section worn on the body of the needle.

Worth checking if you are in there.

Its a varbed one mate and already has a splutter about 7-8000 revs but if you pushed through it would rev out, Probably some shit in the main jet that needs cleaning out. The latest issue feels completely different like its hit a brick wall at 5-6000 . Got a mate who has one same as mine who i can spend wome time at his and get the carbs apart as well. They also have an issue with carb rubbers decaying so will check that too