Help needed - CBR 600 wont start
in [Tech]
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From: The Older Gentleman on 16 May 2010 05:39 Robert Roland <fake(a)ddress.no> wrote: > On Sat, 15 May 2010 18:11:41 +0100, "TigerJ" <tspill(a)talk21.com> > wrote: > > >Also, the headlight work fine. > > Try starting while the headlight is on. If the light goes very weak, > the battery is the culprit. If the headlight's brightness does not > change when trying to start, it may be a starter problem. > > >Also, can I jump start a bike from a car battery > > It will probably be OK, but it is not completely safe. If the bike > battery is very discharged, the inrush current could exceed safe > levels. If one or more cells in the battery are shorted, the current > will be even higher. Never, ever had a problem in over 30 years, and that's including some batteries which wouldn't even light a 3v torch :-) > > You can, however, safely replace the bike battery with the car > battery. But you must make sure the connections remain secure. If the > battery gets disconnected while the bike is running, you risk damage > to the bike's electronics. My Ducati has a sticker warning of the dire consequences should one do this. -- 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: Robert Roland on 16 May 2010 06:12 On Sun, 16 May 2010 10:39:05 +0100, totallydeadmailbox(a)yahoo.co.uk (The Older Gentleman) wrote: >> It will probably be OK, but it is not completely safe. If the bike >> battery is very discharged, the inrush current could exceed safe >> levels. If one or more cells in the battery are shorted, the current >> will be even higher. > >Never, ever had a problem in over 30 years, That still does not mean it's safe. That's not how safety works. >> You can, however, safely replace the bike battery with the car >> battery. But you must make sure the connections remain secure. If the >> battery gets disconnected while the bike is running, you risk damage >> to the bike's electronics. > >My Ducati has a sticker warning of the dire consequences should one do >this. Against replacing the battery with a car battery or against running the bike without a battery? -- RoRo
From: The Older Gentleman on 16 May 2010 09:04 Robert Roland <fake(a)ddress.no> wrote: > On Sun, 16 May 2010 10:39:05 +0100, totallydeadmailbox(a)yahoo.co.uk > (The Older Gentleman) wrote: > > >> It will probably be OK, but it is not completely safe. If the bike > >> battery is very discharged, the inrush current could exceed safe > >> levels. If one or more cells in the battery are shorted, the current > >> will be even higher. > > > >Never, ever had a problem in over 30 years, > > That still does not mean it's safe. That's not how safety works. > > >> You can, however, safely replace the bike battery with the car > >> battery. But you must make sure the connections remain secure. If the > >> battery gets disconnected while the bike is running, you risk damage > >> to the bike's electronics. > > > >My Ducati has a sticker warning of the dire consequences should one do > >this. > > Against replacing the battery with a car battery or against running > the bike without a battery? Sorry, should have been specific. It warns that you'll fritz things if you disconnect the battery while the engine is running. -- 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 09:10 On May 16, 1:13 am, Robert Roland <f...(a)ddress.no> wrote: > It will probably be OK, but it is not completely safe. If the bike > battery is very discharged, the inrush current could exceed safe > levels. If one or more cells in the battery are shorted, the current > will be even higher. When a battery is mostly discharged, the electrolyte is mostly water, the sulfur is deposited on the plates and the cell resistance is high, reducing the amount of current that will flow into the battery. 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. Car alternators put out 40 to 100 amperes, while typical motorcycle alternators only put out 4 or 5 amps. Theoretically, the motorcycle alternator windings and the diodes in the rectifier regulator could be damaged if it remains connected to the car battery for any length of time after the motorcycle engine starts. However, large currents passing through the alternator windings are limited by electromagnetic induction, which increases as the engine RPM increases.
From: The Older Gentleman on 16 May 2010 09:56
.. <an.gleann.mor(a)gmail.com> wrote: > But the alternator might be damaged when using a partly discharged car > battery to jump start it. Like I said, I've jumped bikes off car batteries for over 30 years and never had a problem. Never known anybody else to have a problem, either - except one friend who accepted a jump-start from a truck, not realising that the truck was running a 24v system.... -- 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 |