2002 rc51 not getting spark new to honda vtiwn please help - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 12 (permalink) Old 08-26-2012, 05:14 PM Thread Starter
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2002 rc51 not getting spark new to honda vtiwn please help

so i have a a 2002 rc51 just got it a month ago. since day one the battery would not charge properly and would completly kill batterys to the point they would not even take a charge. i have gone through 3 batterys. so the other day i was riding with a fresh charged battery the temp light would start to flicker when i has hard on the gas then when the bike would sputter and feel like it was cutting out aslo when i was hard on the gas up to 120mph the bike just shut off. so i pul in clutch and let it out so it would pop start but nothing happened untill i turned the key off and back on and then it would start. so i bought another battery just a little bigger one. and i took it to the track to race it and on my third pass my bike lost all power coming back up to start line. it would feel like i was trying to take off in 5th gear but WAS in first. then i pulled in clutch and reved it and it was like it was bogging out and had trouble reving so i pulled up to the like it was idling fine so i shut it off and when i went to start it up it would not start. so i checked for spark and it has no spark on either cylinder. i was guesssing stator,rectifer/reg,pulse generator. i am very low budget at this point and dont have money to replace all so i wrote this detailed thread in hopes that someone has had this problem or can possibley point me to the right diagnosis thanks for your time and i hope to get some good feedback
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post #2 of 12 (permalink) Old 08-26-2012, 06:27 PM
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I recommend Reg/rectifier... just my opinion. For free you can start by checking the wiring, there is a plastic connector that will get hot and fail over time. replacing, properly splicing those wires will get you going... if this is the case, additionally, clean the base and ensure a good ground and good, flat contact on the mounting surface for heat transfer. I had similar issues on my SuperHawk and the above... bought me 3 additional years of trouble free riding... for free, the bike has since been sold...
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post #3 of 12 (permalink) Old 08-26-2012, 06:28 PM
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Download the service manual from the link below.
Follow the troubleshooting sections for charging and ignition systems.
http://www.carlsalter.com/download.asp?p=932
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post #4 of 12 (permalink) Old 08-26-2012, 06:58 PM
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Not to be obvious but if you use the search function above, there is a lot or research you can to that way too. bad and sub have you on a good path to start with.

good luck.



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post #5 of 12 (permalink) Old 08-27-2012, 04:01 PM Thread Starter
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thanks for the input the manual you linked me is awesome!
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post #6 of 12 (permalink) Old 08-30-2012, 10:53 AM Thread Starter
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still no luck even with the detailed manual. i replaced reg/rect and the pulse generator and have a new stator on the way. but my relays in rear keep clicking not sure if its them turning off or if the always click. never heard them before due to being covered in the tail and noise of fuel pump. i removed the whole harness from the bike and spent hours going through it with a fine tooth comb and found no shorts anywhere so i have ruled that out. i have searched many threads on here and other related forums with no luck. any other imput that could be shared would be great. if not i will just replace parts one at a time lol
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post #7 of 12 (permalink) Old 08-30-2012, 11:08 AM
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It sounds to me like your reg/rec has been failing for a while and was sending too high of a voltage into your charging system. The CDI box in this bike is notoriously sensitive. If you're new to the bike, its the potted aluminum box in the tail with one connector. If you have a multimeter you can probe on the signal input wires going into the box from the ECU and see if the ECU is trying to fire the plugs (you should see it alternate between +5V and gnd if I remember correctly). If the ECU is sending a signal and you aren't getting spark, the CDI box is most likely the problem. If you do not see a signal going into the CDI from the ECU, then it sounds like a sensor or something else.

06 600RR - track
05 RC-51 - street
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post #8 of 12 (permalink) Old 08-30-2012, 11:10 AM
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Also check your charging voltage when you get the bike running. Should be around 13.5V and not go above 15V ever. I've seen bikes that go up to 20V and start burning out electronics, which is what may have happened to your bike.

06 600RR - track
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post #9 of 12 (permalink) Old 08-30-2012, 05:06 PM Thread Starter
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thanks for the input i will go try that now and yeah i have been a yamaha r1 guy from the begining and never had a problem. but i heard the rc were very fun bike so had to find out for myself and seems to have got a bad one lol but other than that it is super fun to listen to going down the road but again thanks for some input i will go try and post my results
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post #10 of 12 (permalink) Old 08-30-2012, 05:32 PM Thread Starter
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come to find out im not good with a multimeter lol so.... i can tell you that when i crank the motor over a few time to try to test stuff that cdi box gets warm?
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