no spark! ahhhhhhh

road_motor

New Member
Joined
Jan 30, 2008
Messages
11
:confused:

just finnished building my bike, was very excited to start riding, go down the first hill and engage the motor.......... and it doesn't fire! using the suggested 16:1 ratio for run in.

took the plug out and turned the motor over, as far as i can tell there is no spark!! do you think this could be a faulty CDI unit? I have all the wires color coded, and even with the kill disconected still didnt fire. Im using the 44cc chinese motor by the way.

can someone give me some advice, please??

thanks
JAmes
 
F

fetor56

Guest
Give me a call(82404091) and we'll try to thrash it out.
If i'm not there when u call leave a message and i'll get back to ya.
 

Skyliner70cc

Active Member
Joined
Nov 17, 2007
Messages
1,347
I have had a CDI unit fail before but its possible that its a wiring issuew with the magneto...chinese aren't known for their good soldering of wires to wire posts.
 

road_motor

New Member
Joined
Jan 30, 2008
Messages
11
ok a quick update

did some readings on the multimeter, and were as follows;

1. between black wire and spark plug clip was 2.3 ohm
2. the blue to black wire on the magneto is 352 ohm (is this a little high?)
3. between the black wire coming out of the mag section and engine "Ground" or block, near the spark plug hole was 0.8 ohms. seems ok.

4. between white wire and ground is 2.5 ohm.

Time for me to send an email to Warren at Zbox and get his opinion.

p.s. the soldering is dodge, but it looks like it's in functioning order so I'll leave it for now.
 
Last edited:

Watcher05

Member
Joined
Jan 14, 2008
Messages
38
Oh yes, this is just what I went through.

One of the first things that I did was adjust the gap on your plug (sounds simple but those chinese plugs seem to be finicky 0.25" to .030 - play around). If still no spark, remove cap and strip HT lead back to show bear copper wires and hook directly to your spark plug. When testing, make sure your pushing it at a reasonable pace in low lit area.

Those readings you have are basically what I had and now my bike is going so keep persisting. :)
 
F

fetor56

Guest
Drop-kick your Chinese plug,it's inferior....i use NGK B-6L but there are others that work great....see Warren's website.
 

will_start

Member
Joined
Jan 20, 2008
Messages
486
Hi,

I have had it confirmed (By Warren) that I fried my Magneto. (the coil).
Parts on the way.

I'm going to borrow the text as written by Road_motor.
I think this is the best Multi-meter read test result I've come across
so far on this site (I know there may be some, in some place I've not read)

Test Results of my Fried Magneto.
1. Between White and Black Wires 3.1 Ohm
2. the blue to black wire on the magneto is Open Circuit, (my meter does not show zero, but a solid 1. in my multi-meter left side.)
3. blue to white wires is open circuit.

OK, anyone want to confirm that it has failed for correctness sake.

bye for now,

Will.
 

Watcher05

Member
Joined
Jan 14, 2008
Messages
38
But didn't you get a coil reading (black to blue) of 352ohm. I think I took mine on the multimeter on 2000 (I think) other wise I was getting that reading of 1. Don't want to confuse you but you'll soon find out when you get the new coil.

Good luck!
 

will_start

Member
Joined
Jan 20, 2008
Messages
486
But didn't you get a coil reading (black to blue) of 352ohm. I think I took mine on the multimeter on 2000 (I think) other wise I was getting that reading of 1. Don't want to confuse you but you'll soon find out when you get the new coil.

Good luck!

how best to explain...
The resistance value I get from Blue to Black is the same as
having the probes apart in the air. IE open circuit.

I am really feeling the coil failed because there's a hole where the wires go in front of the motor that I didn't know should be filled with Silicone.

I have silicone at the ready...

CYA

Will
 
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