Starting when hot

1626 · Sep 16, 2011

I know a lot of discussion has being given on this subject but the same problem of starting my fjr1300 when hot.

Pull in for refill of fuel and as if battery is dead leave it for 20 min or so and starts up again.

Reading the forum it could be battery which in my case is new or starter motor relays etc.

Does anyone have the real answer to this problem i would realy appreciate a reply .

SkooterG · Sep 16, 2011

There is no 'real' answer. It could be any one of the things you mentioned. And don't think that just because your battery is new, that it is 'good'. There have been several instances on this forum of a 'brand new' battery being bad and causing problems.

First thing I would do is test your battery to make sure it is 100%. Next I would look at the starter.

ionbeam · Sep 16, 2011

Does your clock and odometer reset when you try to start hot? If no, then excessive current draw is not the problem, and it indicates that the battery is not the problem.

Do you hear the starter relay CLICK one or more times when you press the starter button? One CLICK indicates the relay is probably good and the starter motor most likely has a problem. Multiple CLICKS would indicate that any of these could be bad: starter, wires associated with the starting circuit, battery.

If you don't hear CLICK and you have a volt meter the next step would be to test the starter relay. From the comfort of your home you would clip three wires to the relay and run them out from under the faring, then when you are experiencing a No Start you could use the wires to check voltages.

Next steps will be determined by your answers.

Pepperell · Sep 16, 2011

If you're showing 4 bars and the fan is on, leave the key on and let the fan run for a couple minutes before trying to start. It should pull the temp down enough to let it start.

I wonder if low octane gas could exacerbate this problem? High octane with a slower burn might help in the hot weather.

wfooshee · Sep 16, 2011

When it happened to me a couple of years ago, it was the starter. Just a month ago the same thing happened to my work car. Poor hot cranking, starts fine when cold. Finally failed altogether, though, which made finding the bad starter pretty easy for the shop.

My hot start symptom was slow cranking, like maybe it would turn over once or twice and hang, and the clock would reset. Did the same with a new battery, and through testing with an ammeter I determined that the starter was pulling about 3 times the current it's supposed to. Replaced it, all was well.

But don't just replace your starter without making sure it's the problem. An expensive way to go trial and error.

SkooterG · Sep 16, 2011

Pepperell said:
If you're showing 4 bars and the fan is on, leave the key on and let the fan run for a couple minutes before trying to start. It should pull the temp down enough to let it start.

I wouldn't do that. Fan seems to draw an awful lot of current. (waiting to be spanked by ionbeam) I would want my battery as full as possible for starting problems. Besides, the fan will just cool the coolant in the radiator. Not so much the engine.

Pepperell said:
I wonder if low octane gas could exacerbate this problem? High octane with a slower burn might help in the hot weather.

I don't think so. For 8 years now I have been doing regular starts with a hot engine in 115+ temps with 87 octane gas and no issues. It's not a gas problem. It's an electrical issue somewhere.

odot · Sep 16, 2011

Battery, battery, battery. I need one, too.

Starting when hot

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Starting when hot

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