RC51 starting problems - Honda RC51 Forum : RC51 Motorcycle Forums
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 18 (permalink) Old 10-22-2010, 08:37 PM Thread Starter
Member
 
Join Date: Oct 2010
Posts: 44
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
RC51 starting problems

Ok guys well i just bought an 03 and go it home rode it for a couple days, and then it wouldnt start, had original batter in bike so i figured that was the problem, so I go and buy a new battery and then ride it for a couple more days, then again same problem, it will not start. I checked it the battery with the bike started and its only around 10V. So my question is what does that mean>? stator? and if anyone can give me an idea of what it might cost to fix it and how hard the job is. I am not mechanically challenged or anything and I do have the 2000 to 2002 RC51 service manual, so i am not sure if that will work for my problem or beings my bike is a 2003. Thanks in advance

Bryan
RingB21 is offline  
Sponsored Links
Advertisement
 
post #2 of 18 (permalink) Old 10-23-2010, 08:56 AM
Lifetime Premium
 
madbuyer's Avatar
 
Join Date: Sep 2010
Location: Indy
Posts: 8,335
Mentioned: 17 Post(s)
Quoted: 226 Post(s)
If it was the stator, wouldn't the battery just drain? 10V is low but not very low...



The very first schoolbook that was written had God all over it. --Dave Mustaine
madbuyer is offline  
post #3 of 18 (permalink) Old 10-23-2010, 10:05 AM Thread Starter
Member
 
Join Date: Oct 2010
Posts: 44
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
see thats what I am not sure of, how low the battery would get, it usually gets down to about 9V after couple days of riding, and the manual says this bike needs over 12 to start, so i am not sure whats going on, cuz i can throw the battery on the charger and it will start and run for a couple days, then im back in the same boat...????????
RingB21 is offline  
 
post #4 of 18 (permalink) Old 10-23-2010, 02:28 PM
Moderator
 
SubSailor's Avatar
 
Join Date: Oct 2008
Location: Sarasota, FL
Posts: 6,456
Mentioned: 24 Post(s)
Quoted: 88 Post(s)
It could be regulator/rectifier unit.
Start your bike and check the charging voltage.
Should be 13.5 to 14.5 volts, but never 15 or more volts.
If a battery is at 11 volts, it's effectively dead.
Download the service manual and go through the troubleshooting section.
http://www.rc51.info/index.php?page=service
SubSailor is offline  
post #5 of 18 (permalink) Old 10-23-2010, 03:09 PM Thread Starter
Member
 
Join Date: Oct 2010
Posts: 44
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
by charging voltage do u mean checking the battery while it is running. cuz if thats what u mean, i did that and I never even peaked into the 13. I charged the batter last night at it was 12ish volts and bike would start, but when running its only still putting 12ish V out?
RingB21 is offline  
post #6 of 18 (permalink) Old 10-23-2010, 09:24 PM
Lifetime Premium
 
madbuyer's Avatar
 
Join Date: Sep 2010
Location: Indy
Posts: 8,335
Mentioned: 17 Post(s)
Quoted: 226 Post(s)
Leave the bike off and check the amperage leak down. Do you know how to use an amp meter? If not, you risk blowing your meter. It isn't hard, just make sure all or your connections are well insulated

SubSailor may be on to something with the rectifier. There is a section in the manual that has set resistance reading for the charging system. It would be worth a going through those numbers to make sure they are close.



The very first schoolbook that was written had God all over it. --Dave Mustaine
madbuyer is offline  
post #7 of 18 (permalink) Old 10-24-2010, 03:42 PM Thread Starter
Member
 
Join Date: Oct 2010
Posts: 44
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
OK so i unhooked my stator and checked it with my MM. With bike off an everything each pin is reading starting at .9 and then going down to .5 after about 2 seconds. Then i took my black cable of my MM and touched it to the neg side of battery for a ground (which if i was understanding right was the next step the manual said do to) (correct me if im wrong) and then went through the prongs 1 by 1 and i was still getting the same readings (.9 then down to .5)? So does this mean my stator is shot, or am i doing something wrong and not understanding this whole idea.. Thanks for all the help.
RingB21 is offline  
post #8 of 18 (permalink) Old 10-24-2010, 08:08 PM
Lifetime Premium
 
madbuyer's Avatar
 
Join Date: Sep 2010
Location: Indy
Posts: 8,335
Mentioned: 17 Post(s)
Quoted: 226 Post(s)
I am sorry Ring...you were measuring resistance correct? If so, you are supposed to get readings. If no readings you would have an open situation in which I would guess stator no good. What about doing the load test??



The very first schoolbook that was written had God all over it. --Dave Mustaine
madbuyer is offline  
post #9 of 18 (permalink) Old 10-24-2010, 09:26 PM Thread Starter
Member
 
Join Date: Oct 2010
Posts: 44
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Man i am so confused.....I just turned the MM to ohm or whatever that little horseshoe symbol is and thats how I took my reading. Can u assist me in telling me what I need to do so i can get this thing figured out...I would really appreciate it...
RingB21 is offline  
post #10 of 18 (permalink) Old 10-24-2010, 09:43 PM
Moderator
 
SubSailor's Avatar
 
Join Date: Oct 2008
Location: Sarasota, FL
Posts: 6,456
Mentioned: 24 Post(s)
Quoted: 88 Post(s)
A fully charged battery should be around 13 to 13.2 volts.
An undercharged battery is below 12.3 volts.
A battery that shows around 11 volts or less is effectively dead.

To check charging voltage, start the engine and warm it up.
Connect the voltmeter across the battery posts.
With the headlight high-beam on, rev the engine to 5000 RPM and measure the charging voltage. The charging voltage should be around 13.5 to 14.5 volts, but less than 15.5 volts.

For the battery current leakage test, with the ignition switch OFF, disconnect the negative battery cable, and connect the meter to the negative battery post and negative cable end.
Set the meter to measure Amps, start at the high scale and work downwards.
The maximum current leakage should be .1mA max.
If greater than .1mA, you may have a short somewhere.

For the stator windings, disconnect the 3-pole connector from the alternator to the regulator/rectifier unit.
With the meter set to measure resistance (ohm/horse shoe symbol) (with ignition OFF), measure the resistance between the three pins. The resistance should be .2 to .5 ohms for each coil.

If less than .2 ohms, you may have a shorted winding.
Measure from each pin to ground. There should be no continuity.
If there is, you have a short in a stator winding.

Last edited by SubSailor; 10-24-2010 at 10:14 PM.
SubSailor is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda RC51 Forum : RC51 Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome