I hate my CDI

[adrian101]

I have brought two speedo's and I'm 100% sure that my CDI unit is interfering with the speedo's. Both speedo's just blank out and die. I change batteries but they are dead.. Is their a CDI that will not interfere with the speedo or is it best for me to change to a speedo like the one below:

 

[proctor-nashua]

hi i had the same perblom but it was my springer forks screwing then up

 

[gothicguy64]

hi again

im presently using a repco 9 corded speedo from bigw ....15 bux
so far only a wireless speedo wont work becoz of cdi


brad
syd

 

[Al.Fisherman]

That appears to be a mechanical, and not a electronic speedometer. The ring that fits over the axle is what operates the needle, via cable. They don't or should I say I haven't had one that would last on these motorized bikes. Just because the needle can or shows it can register a speed (50mph) much faster then you can go, doesn't mean the speedometer gears can take it. Everyone that I've worked with had no battery. What battery are you talking about?

 

[adrian101]

hi again

im presently using a repco 9 corded speedo from bigw ....15 bux
so far only a wireless speedo wont work becoz of cdi


brad
syd

I had the same speedo LOL

 

[adrian101]

That appears to be a mechanical, and not a electronic speedometer. The ring that fits over the axle is what operates the needle, via cable. They don't or should I say I haven't had one that would last on these motorized bikes. Just because the needle can or shows it can register a speed (50mph) much faster then you can go, doesn't mean the speedometer gears can take it. Everyone that I've worked with had no battery. What battery are you talking about?

The one's i've had previous where battery operated, repco 9f like the picture below:


The other one that i showed early is a mechanical speedo that i was thinking of getting. but now that i know they may not be able to register high speeds then i won't worry about it. lol

Once my motor is completely modded(sp) up i want to take it for a speed test without the speedo sh#ting itself?

Do you know of any good ones?

 

[GearNut]

Some folks have had good results by relocating the CDI box to the seat tube. You may need a longer spark plug wire to do this.

 

[davidstipek]

The one's i've had previous where battery operated, repco 9f like the picture below:
View attachment 31702

The other one that i showed early is a mechanical speedo that i was thinking of getting. but now that i know they may not be able to register high speeds then i won't worry about it. lol

Once my motor is completely modded(sp) up i want to take it for a speed test without the speedo sh#ting itself?

Do you know of any good ones?

I had the same speedo... made in Tiawan. Speedo good for bike.... BUT!!! sending unit is excellant. I changed heads to a chrome MC unit, using cable that came with original package and retained axle/wheel drive sender (Lub it up good with a soap base lithium grease... sqeeze it in) I have chopper bicycle with 80cc Yamaha / semi automatic trans...no clutch. I have done extensive rides all over northern Thailand no issues speeds in excess of 80 kph. Keep excessive grease on it for the first 400-500 km and you will be fine. Just add it to Maintainence schedule (example: checking chain tentios and lubeing) My speedo head is from Honda Boss, cable fits perfectly!!

 

[adrian101]

Is there anything i can put on my CDI to help stop interference? I don't know if its from vibrations or the CDI but its killing my speedo. I'm on my 5th speedo thus far

 

[davidstipek]

Couple of questions first:

How close to speedometer and sender/pickup is CDI? (I am assuming it is magnetic impulsed)

Try using cell phone close to CDI when Bike is running... Static?

First make sure CDI has a good ground. You can also jumper ground from frame to Front fork. (This has been known to cure alot of Gremlins) Do your lights flicker? If so check all ground wire connections.

If the first question answer is Magnetic. Go to computer shop and ask then for a small lead sheild pack just big enough to totally cover CDI. Then neatly fold and tape up like you are making Mothers Day Gift (So it looks neat... Not like a Red Neck did it ... OK?)

Let me know what happens. Also if speedo has any alectrical connection to Bike electrical system... Make sure it has good external ground. You can run to and connect to the jumper I hope you installed.

Luck!
David:helmet: