starter and heat

[atrent]

The starter is very sluggish to not working when hot. First thought is bad starter so I removed it. Can't see a thing wrong. brushes are fine com is fine
Bearing play is just decernable. Turns freely, no sign of rubbing. Cable connection clean and tight. Relay connections the same. When cold works like a charm. I guess I s hould mention that this is an 84 gs250T
alex

 

[Steve]

Might help to also mention how good the battery is. :-k

Check the voltage before you turn the key ON.

Check the voltage after turning the key ON, but before starting the bike.

Check the voltage with the engine idling.

Check the voltage with the engine at 2,000 RPM.

Check the voltage with the engine at 5,000 RPM.

Report back with the results.

.

 

[posplayr]

http://www.thegsresources.com/_forum/showthread.php?t=164993

 

[atrent]

starter and heat

starter and heat

battery is fine. Actually it is new at least it was new last fall. The voltage is up to scratch 12.5 no load of course it takes a beating when the starter fails to turn. when cold no problem. I am going to try a different battery although I feel this one is ok. However I can find no other likely source of the problem.
alex

 

[Big T]

So, what is the voltage at the battery when you push the starter button?

And all those other readings Steve asked for?

 

[Steve]

At 12.5 volts, it's not quite "up to scratch". :-k

.

 

[atrent]

At 12.5 volts, it's not quite "up to scratch". :-k

.

I believe that 12.5 12.6 are quite normal for a 6 cell lead acid battery at rest.
alex

 

[posplayr]

some representative curves.


http://www.scubaengineer.com/documents/lead_acid_battery_charging_graphs.pdf

At least for my battery at 65 degF if it will be at about 12.5 volts after sitting for about a week. If it was just charging it would be closer to 12.8-12.9v which is probably indicative of a bit of surface charge that comes off pretty quick.

After pulling off the charger , I can turn the headlights on for a few seconds and it still seems to come back to read over 12.8v

 

[atrent]

some representative curves.


http://www.scubaengineer.com/documents/lead_acid_battery_charging_graphs.pdf

At least for my battery at 65 degF if it will be at about 12.5 volts after sitting for about a week. If it was just charging it would be closer to 12.8-12.9v which is probably indicative of a bit of surface charge that comes off pretty quick.

After pulling off the charger , I can turn the headlights on for a few seconds and it still seems to come back to read over 12.8v

Sounds about right for a battery in good condition. I think the theoretical voltage is appox 2.2 volts per cell hence the 13.2 volts for a fully charged battery. However in the real world this is hard to obtain. My charging system seems to level off at 15volts at 4k and above. Higher than I would like.
alex

 

[posplayr]

Sounds about right for a battery in good condition. I think the theoretical voltage is appox 2.2 volts per cell hence the 13.2 volts for a fully charged battery. However in the real world this is hard to obtain. My charging system seems to level off at 15volts at 4k and above. Higher than I would like.
alex

Rule of thumb C/10 would have the R/R output set at 14.5V/100 SOC which is pretty typical. The Suzuki R/R's are pretty loosey goosey with an upper allowable range of 15.5 IIRC.

Anyway, this is really relatively independent of the at rest battery voltage which is not really even given in the curves as they assume at least C/100 Charge / Discharge and there is a significant discontinuity there.

Actually getting a closer look at the last chart is showing 12.7V at C/100 discharge and 13.35 ish at C/40 charging. So the lower chart confirms voltages in high 12's even possibly over 13V for topped off batteries.

So immediately after a ride if you are are at 12.5V I would say you are probably not charging very well.

 

[atrent]

Rule of thumb C/10 would have the R/R output set at 14.5V/100 SOC which is pretty typical. The Suzuki R/R's are pretty loosey goosey with an upper allowable range of 15.5 IIRC.

Anyway, this is really relatively independent of the at rest battery voltage which is not really even given in the curves as they assume at least C/100 Charge / Discharge and there is a significant discontinuity there.

Actually getting a closer look at the last chart is showing 12.7V at C/100 discharge and 13.35 ish at C/40 charging. So the lower chart confirms voltages in high 12's even possibly over 13V for topped off batteries.

So immediately after a ride if you are are at 12.5V I would say you are probably not charging very well.

Actually right at shut down the voltage is just above 13 but it drops to about 12.6 in a fairly short time. Less than 30 minutes. It does seem to hold the 12.6. This is a Walmart battery made in china and is about 1 year old.

 

[posplayr]

Actually right at shut down the voltage is just above 13 but it drops to about 12.6 in a fairly short time. Less than 30 minutes. It does seem to hold the 12.6. This is a Walmart battery made in china and is about 1 year old.

so it sounds like you are in really good shape ; hope you enjoy the ride.