Davidbg Posted June 27, 2011 Share Posted June 27, 2011 Ok so 2 weeks ago my bike wouldn't start, switched on fine but wouldn't turn the engine over. Replaced the battery, worked fine for 2 weeks - even tested the old battery, it was well and truly dead... then today I ran it as usual and as it was warming up it stalled itself and wouldn't start again. Recharged battery with an optimate, still won't turn over again... Most suggestions have been reg/rec but I can't be sure - the problem I've got is my nearest bike dealer is 50 miles away and the local guy I usually use has a 2 week waiting list and I only have a week to sort this...If it is reg/rec where should I look for parts? It's a Honda CBF250 by the way... and is it easy enough to fit? Quote Link to comment Share on other sites More sharing options...
Guest Posted June 27, 2011 Share Posted June 27, 2011 Reg/Rec is easy enough to fit, generally plug and play unit. If the reg has gone kaput, it normally allows the stator to fry the battery.... You say you have charged the battery? But it doesn't turn over? ie not enough grunt?Does sound like it isn't charging/over charging, which on the face of it points towards the reg/rec ...Got a haynes or similar? Best bet is follow the process of elimination with their trouble shooting guides, don't wanna be forking out for a reg/rec if you don't need one!! Quote Link to comment Share on other sites More sharing options...
Davidbg Posted June 27, 2011 Author Share Posted June 27, 2011 Reg/Rec is easy enough to fit, generally plug and play unit. If the reg has gone kaput, it normally allows the stator to fry the battery.... You say you have charged the battery? But it doesn't turn over? ie not enough grunt?Does sound like it isn't charging/over charging, which on the face of it points towards the reg/rec ...Got a haynes or similar? Best bet is follow the process of elimination with their trouble shooting guides, don't wanna be forking out for a reg/rec if you don't need one!! No Haynes for my bike And no- won't turn over at all... Optimate says it's fully charged - pretty sure it isn't charging off the alternator either, rode it 20 miles after a bump start and didn't make any difference Quote Link to comment Share on other sites More sharing options...
Guest Posted June 27, 2011 Share Posted June 27, 2011 Got a multi meter? Quote Link to comment Share on other sites More sharing options...
Guest Posted June 27, 2011 Share Posted June 27, 2011 carlsalter.com has free download of the CBR250 service manual. This the same engine? Be a help I bet at the very least....Had a google for you, but the service manual looks as rare as rocking horse shit. Quote Link to comment Share on other sites More sharing options...
Davidbg Posted June 27, 2011 Author Share Posted June 27, 2011 no, not sure i have... maybe an unsophisticated machine somewhereThis is the problem I've had - it's not a very common bike, so finding help can be trickySo how do you test a reg/rec assuming I can get it out? Quote Link to comment Share on other sites More sharing options...
Davidbg Posted June 27, 2011 Author Share Posted June 27, 2011 and engine wise - mines a single cylinder, I think the CBR is a 4 cylinder? Quote Link to comment Share on other sites More sharing options...
Guest Posted June 27, 2011 Share Posted June 27, 2011 In a nutshell, the reg/rec, takes the voltage from the the stator, which pumps out thousands of AC volts, and converts them to 12 DC ... sort of thing ... my explanation is proberly lacking,... but close.If it is failing, it allows AC into the battery and frys it .. As for testing it, not sure... cue the waiting game for someone who does!!! Quote Link to comment Share on other sites More sharing options...
Davidbg Posted June 27, 2011 Author Share Posted June 27, 2011 yeah fraid so... I'm a physicist so I have a rough idea of electronics, sounds kind of like a transformer but doesn't a slightly different thing.I found a manual - but it's all in spanish so i'm working my way through it.Does it have to be in the bike running when you test it? or can it be removed for testing? Quote Link to comment Share on other sites More sharing options...
Guest Posted June 27, 2011 Share Posted June 27, 2011 Have no knowledge of how to test them off the bike mate. Soz Quote Link to comment Share on other sites More sharing options...
N1NJA Posted June 27, 2011 Share Posted June 27, 2011 A rectifier is made up of diodes, diodes only allow voltage to run one direction. This is a simple bridge rectifier, it converts ac voltage to DC. The general diode test when testing between the points should read a nominal reading in the region of 0.6 upwards and nothing when the probes of the meter are reversed. if you get a reading from the meter with the probes in either direction the rectifier is faulty. You will need to establish each connection on the rectifier to test this though so a service manual or manufacturers drawing will be needed.Alternatively if you can get the bike running long enough to put the meter accross the battery terminals you should read 14Vdc. Quote Link to comment Share on other sites More sharing options...
rennie Posted June 28, 2011 Share Posted June 28, 2011 A faulty reg/rec will NOT! prevent a fully charged healthy batteryfrom starting the engine!It only does anything once the engine is running and the alternatoris spinning.with fully charged healthy battery what exactly happens?Do lights work? ignition/neutral lights?does engine try to turn over?clicking from starter motor/ solenoid?If nothing works check fusesIf lights work but nothing else check starter motor, solenoidand connections.Once engine running check reg/rec.if voltage readings are wrong turn off quickbefore it fries your good battery Quote Link to comment Share on other sites More sharing options...
Davidbg Posted June 28, 2011 Author Share Posted June 28, 2011 Ok - update from todays efforts...Took the bike apart and tested reg/rec, that was fine. Took it to a garage and it turned out to be a starter motor and quoted £500 for it!!! so i'm looking around for something cheaper that i can source myselfWhat fun ¬¬ Quote Link to comment Share on other sites More sharing options...
eastanglianbiker Posted June 28, 2011 Share Posted June 28, 2011 if its the starter motor then its worth taking it apart and checking the condition of the brushes inside it that run on the armatuer it could just be them worn out Quote Link to comment Share on other sites More sharing options...
Davidbg Posted July 1, 2011 Author Share Posted July 1, 2011 All solved now it was the brushes on the starter motor - only a £163 bill, could've been worse i guess Quote Link to comment Share on other sites More sharing options...
Guest Posted July 2, 2011 Share Posted July 2, 2011 Glad you got to the bottom of it David Quote Link to comment Share on other sites More sharing options...
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