flat battery after riding

[hmmmnz]

ok bike is a 2001 vtr1000
new battery, decent new reg/rec
stator produces decent ac voltage when running,
reg/rec is producing a decent and constant 14.4 ish vdc

when the bike is cold it cranks over fine and fires into life no problem

but if i ride say 10 mins or more and get the bike hot,
stop, and then try and start it, its like the battery doesnt have enough power to turn over the bike.

wait until its cold, say an hour, then it'll turn over and start fine.

its like some thing is tightening up when it gets hot,
but ive had it happen and had the mrs come with jump leads, and its started, so may be its some parasitic load when the bike is on.

may be the reg/rec if failing when it gets hot. (its a larger than standard rec, but not a mosfet version)

any ideas kids.
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[Pete.]

Put a meter on the battery when it's hot and has the problem. If it's still holding voltage when it fails to crank, check your earths.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[Hahadumball]

i have loads of spares including a stator so if it is that i do cheap price <3

never heard of this issue with the vtr though, usually reg rec gets fried and takes the stator and battery with it
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Fin: no matter how much I look at It I can't understand what was going through my head, all I remember is going about 80 and redlining it to stop it seizing.
360 Deg... Five 1/4 turns. :- Teflon-Mike 18 Jan 2015

[RhynoCZ]

Maybe the coil/s is failing you. Old coils do get crap with heat and when they cool down they work like brand new again. That would explain the hot = no go, cold = yay.

It could also be a dodgy battery. When you try to use it, the voltage drops = no go, but when you let it sit for a while, it will regenerate on its own.
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'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Howling Terror]

As mentioned check the earths and any powered accessories.

I had a reg/rec that worked fine when cold and then failed when it got hot. Found this out by riding with a voltmeter attached (plug-in type that goes in power adapter).
Fitted the new reg/rec in some airflow and seems ok.
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[chris-red]

[hmmmnz]

OK I checked the wiring,
found a bit of corrosion on the feed wires that come off the starter relay.
Cleaned them up,
added an extra earth from the battery to the subframe

And ran it up to 105'C to make sure the fan kicked in.
Stayed at a constant 14.4 with the lights off, and 14.3 with them on, 14.3 with the fan on as well.

A constant 0.6amps to the battery
And more when the lights.

Turned the bike off,
Voltage was 13.2v

Waited about 5 mins to simulate getting gas,
Temp was sitting at 87'C
Tried to turn over, drawing peaks of around 320amps
Averaging about 200amps, but not Turing fast enough to start.

Current voltage is 13.01volts and slowly raising.
Temp. 76' and dropping.
I'll check back in half an hour.
No charger connected.
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[hmmmnz]

ok, just retested it.

temp has droped to 53'C
and voltages is 13.07V

turned over and started easily.

-

wtf is going on,

some thing must be expanding when its hot and increasing the resistance on the drive train making it hard to turn over.

any guesses?
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[hmmmnz]

ill steal the milli-ohm /low ohm meter from work tomorrow and check the resistances on the starter relay and all the big cables and see if ive got a high resistance some where.
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[chris-red]

I reckon it is the start motor. Get it up to temperature where it fails then run a wire straight from the live side to the starter. if it does turn over I'd say that is your culprit, maybe trying doing it with a known good battery to be sure.

edit:

I've give this a go

https://www.ebay.co.uk/itm/For-Honda-VTR-1000-F-Fire-Storm-2002-Arrowhead-Starter-Motor-Repair-Kit-/301936721060?hash=item464cd4bca4:g:hnYAAOSwJSJXGV~a
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WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.

[Hahadumball]

ill do £15 posted for a starter

ill test it first and get it up to temperature then give it a wizz before posting
____________________
Fin: no matter how much I look at It I can't understand what was going through my head, all I remember is going about 80 and redlining it to stop it seizing.
360 Deg... Five 1/4 turns. :- Teflon-Mike 18 Jan 2015

[hmmmnz]

i chucked the milli ohm meter on it, and was getting about 20 milliohms over a meter, which is about 10 times what i should get for pure copper at 10mm2 diameter, saying that, it looks like its tinned copper.
so thats out the window, and doesnt seem excessivly high considering. but i might make up some new leads, at maybe 16mm2
just to drop the resistance even more. considering coppers resistance increases with heat, it may be a factor (#pluckingatstraws)
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[hmmmnz]

Right update,
I replaced all the starter cables with 16mm2 cable.
With decent hydraulicly crimped lugs,
https://i58.photobucket.com/albums/g257/hmmmnz/vtr1000/DSC_0986%20Large_zpspuykgjxs.jpg



I cut the original cable open, and the copper had turned black.
https://i58.photobucket.com/albums/g257/hmmmnz/vtr1000/DSC_0984%20Large_zpslwrrz7xh.jpg



I replaced the starter motor and gave it a quick Polish on the wire wheel
https://i58.photobucket.com/albums/g257/hmmmnz/vtr1000/DSC_0989%20Large_zpslgt26mmu.jpg


And since everything was out of the way, replaced the cam chain tensioners. As well.

Also had a leaking fork seal, so killed that bird whilst I was at it.
I hate not having a center stand!!
Made do though
https://i58.photobucket.com/albums/g257/hmmmnz/vtr1000/DSC_0979%20Large_zpsgzrmpzuo.jpg



Heres a start up video as well.

https://youtu.be/iXWMu8XimTw


So all is good in the world
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches