Help needed - CBR 600 wont start
in [Tech]
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From: Rob Kleinschmidt on 16 May 2010 12:50 On May 15, 10:46 am, totallydeadmail...(a)yahoo.co.uk (The Older Gentleman) wrote: > TigerJ <tsp...(a)talk21.com> wrote: > > I think the battery is fine as I have fully charged it and the charger shows > > it as being full. Also, the headlight work fine. > > It's probably dead even so. Agreed. Could be a bad connection at ground or battery +, but more likely to be the battery. An OK digital multimeter can be bought for ~ $25. Buy one and check the battery voltage or just lug the battery in to a shop and let them test it for you.
From: No Spam on 16 May 2010 13:00 "." <an.gleann.mor(a)gmail.com> wrote in news:a6ea1833-508b-432a-a074- b63ea0ade95f(a)q36g2000prg.googlegroups.com: > > The motorcycle's alternator wattage is well matched to the > motorcycle's battery ampere capacity. > > But the alternator might be damaged when using a partly discharged car > battery to jump start it. > Not hardly, unless the voltage regulator and the rectifier diodes are shorted. They isolate the alternator windings from reverse current. If they were shorted... The battery would discharge through the alternator windings, faster than a 20 amp charger could recharge it. Charging the battery off the bike, then installing it would result in melted insulation, until the main fuse blows. regards, Joe
From: No Spam on 16 May 2010 13:23 "." <an.gleann.mor(a)gmail.com> wrote in news:d95613a2-43a2-4a4d-a8ae-e5377e179285(a)v12g2000prb.googlegroups.com : > > If you turn the headlight on, it should stay bright for at least > half an hour without the battery voltage dropping below 12 volts. > Actually, that's not such a good idea. While the bike isn't old enough to have points you could burn by leaving the ignition on that long, and it isn't old enough to have a ballast resistor that you could overheat and ruin by leaving the ignition on that long, still it's not a good idea to leave it turned on that long while the engine isn't running. Yes, your electronic ignition should have good enough protection circuitry to keep from damaging it, but it's designed to handle voltage spikes on the signal lines, not continuous current if the crankshaft just happened to stop in exactly the wrong spot the last time you shut the engine off. That kind of test will tell you the battery had at least 3 amp hours of charge when you were trying to start the bike. It won't tell you if the battery has low enough internal resistance, to supply the starter with enough current, to crank the engine over fast enough to start. To find that out, you need to precisely measure the voltage at the battery terminals, under a known load. This can be done with a good digital voltmeter, using just a headlight for a load, but it has to be done off the bike using a simple test jig. regards, Joe
From: The Older Gentleman on 16 May 2010 14:02 No Spam <nospam(a)dont.bother.gov> wrote: > Actually, that's not such a good idea. While the bike isn't old enough > to have points you could burn by leaving the ignition on that long, and > it isn't old enough to have a ballast resistor that you could overheat > and ruin by leaving the ignition on that long, still it's not a good > idea to leave it turned on that long while the engine isn't running. > Yes, your electronic ignition should have good enough protection > circuitry to keep from damaging it, but it's designed to handle voltage > spikes on the signal lines, not continuous current if the crankshaft > just happened to stop in exactly the wrong spot the last time you shut > the engine off. So use the kill switch as well. Sheesh. -- BMW K1100LT Ducati 750SS Honda CB400F Triumph Street Triple Suzuki TS250ER GN250 Damn, back to six bikes! Try Googling before asking a damn silly question. chateau dot murray at idnet dot com
From: . on 16 May 2010 14:24
On May 16, 10:00 am, No Spam <nos...(a)dont.bother.gov> wrote: > "." <an.gleann....(a)gmail.com> wrote: > > > But the alternator might be damaged when using a partly discharged car > > battery to jump start it. > > Not hardly, unless the voltage regulator and the rectifier diodes are > shorted. They isolate the alternator windings from reverse current. While that's true, the point I was trying to make is that the motorcycle's alternator would try to *charge* the partly discharged car battery *and* the discharged motorcycle battery, and that current would be too much for the alternator windings and the RR diodes to handle. Other items that could be damaged are the plastic connectors from the alternator and the RR to the motorcycle wire harness. They *melt* under heavy load. |