CDI problem? - Honda RC51 Forum : RC51 Motorcycle Forums
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 09-16-2016, 05:40 AM Thread Starter
Junior Member
Join Date: Sep 2016
Location: Puerto Rico
Posts: 1
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
CDI problem?

I tried to browse a while to see if someone else had posted on the subject. My RC shut down at iddle and I could not get it to start. I tried checking the fuses and they were okay check almost everything before taking the bike to the shop. At the shop I watch the mechanic check current and fuses ans ended up at the CDI box. It seemed to be quite hot to the touch so he quickly pointed to that as the source of the problem. The thing is I went to 3 diferent Honda dealers and kept on hearing the same "these CDI's hardly fail" so I'm stuck with an issue here. Should I change lets say the relays or something first? The guy at the shop seemed very sure about the CDI but it is costly to buy a part and having another electrical issue burn the same part again and stuff you know what I mean. Anyway if anybody out there has had an issue like this any feedback would be appreciated.
joseanespinosa is offline  
Sponsored Links
post #2 of 5 (permalink) Old 09-16-2016, 12:41 PM
Senior Member
AMP1's Avatar
Join Date: Jun 2013
Posts: 221
Mentioned: 1 Post(s)
Quoted: 27 Post(s)
three shop techs say its Cdi i say 99.9% chance they all correct.
change CDI

1946 norton 16h
honda rc51
AMP1 is offline  
post #3 of 5 (permalink) Old 09-18-2016, 07:57 PM
Super Moderator
YtseJam's Avatar
Join Date: Dec 2009
Location: Central California
Posts: 1,237
Mentioned: 3 Post(s)
Quoted: 18 Post(s)
.....moved to Tech Talk.
YtseJam is offline  
post #4 of 5 (permalink) Old 09-19-2016, 11:32 AM
Senior Member
jondog9's Avatar
Join Date: Aug 2010
Location: Northern CA
Posts: 8,653
Mentioned: 15 Post(s)
Quoted: 317 Post(s)
I don't know how interested you are in tackling the repair of your won cdi, but I can pass this thread along to you. Haven't tried it myself, never had the occasion, but I would consider it if I had issues with my own cdi...

John, 2000 RC51 #000100

jondog9 is offline  
post #5 of 5 (permalink) Old 09-20-2016, 05:35 AM
Lifetime Premium
The Stig's Avatar
Join Date: May 2011
Location: Chiba, Japan
Posts: 4,617
Mentioned: 27 Post(s)
Quoted: 159 Post(s)
A hot CDI box doesn't mean it's failed. But if upon checking all the ignition connections there's a signal to the CDI but no spark (check both cylinders) then it could be the CDI.

I had mine fail when I first got the bike, on 3 different occasions. Eventually I traced it to the wiring harness having been modified by the previous owner to place the CDI in a different location to standard. He'd used crimp connectors, but this allowed a spark to occasionally travel between two connections and fried the CDI.

So I soldered and shrink wrapped each of (8 if I remember correctly?) the wires, then wrapped all together with insulating tape. Never had a problem again.

I have a brand new unused CDI I used to carry as a spare in case mine broke again, but knowing it's fixed for good, I could sell it to you if you need an SP2 one for what it cost me, which cost me less in Japan than what it'll be new in the U.S. now I expect.

Euro RC51 SP2: HRC WSB Ti Hi-Level, T1 Airbox & Snorkel, PCIII, Dymag CA5 Carbon Wheels, Ti64 Spindles (F, R & Swing Arm), Mori Link, Maxton GP7 Shock & Ohlins 832 Forks, Brembo GP Calipers & SBK narrow track (F), Braketech Disc (R), Brembo billet Underslung x 2 Brembo RCS, Tyga Triple, 7075 Stem, Probolt Titanium all over, Babyface rearsets, MR Complete Carbon Lineup, Custom Undertail & CBR 1000 LED, Watsen LED Indicators, Harris Brace, Giles clip-ons, Corbin seat, etc. 2013 BOTY.
The Stig is offline  
Sponsored Links

Quick Reply

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


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

Email Address:


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