Spark plug gap

[Cisco]

it's possible the pickup coil is putting out a weaker pulse than it should

Yes, it's likely a cheap coil. The magnet seems strong. It's hard to find a good coil online (especially on eBoy or Ama-zone). They all advertise heavy duty coils, but few really are. I've already replaced the ignition wire (7mm) and using an NGK boot.

 

[Cisco]

Grubee has standard coils in stock, which may be a good choice for my stock CDI. They are out of stock on their Fat Boy coils. Here's what they say:

Use this TZ HP Fat Boy Coil with our TZ HO RED WIRE CDI or any good Aftermarket, ( Lightening , Jaguar, etc. ) external mount CDI system.

• 4700 Turns of wire versus 3800 Turns for a standard magneto coil. ​

• 310 to 315 ohms resistance value. ​

Do not use this HO Fat Boy coil with a standard TZ or SD Black wire CDI box as it may over drive the CDI triggering process and actually give less available Kilo Volts to the spark plug... Use only with TZ HP Red wire CDI or with the aftermarket Lightening big box CDI or equivalent.​

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[Cisco]

This indicates that the coil and CDI need to be matched. Just slapping on a 'Heavy Duty' coil may not be the performance upgrade advertised :-/

 

[Cisco]

Of course they are out of stock on their hottest ignition set :-(

 

[Street Ryderz]

My stock CDI is a little weak. I get better spark with a tight .024 gap (b6hs).

You can test it brother with a spark strength tester (they are cheap) and see if it gets atleast 20kv, a tighter gap doesn't really make a stronger spark.

 

[Cisco]

spark strength tester

I had to search around. I found an inductive tester (Ignition System KV Quick Tester ADD760) but they are priced around $50. I guess that's not too spendy. Any suggestions?

 

[Street Ryderz]

Amazon.ca

Check Harbor freight they are pretty cheap for this style.

 

[DieselTech]

Cisco go to auto parts store & tell them you want one of these. They used to be about $10

 

[Cisco]

Oh, I thought these were just spark indicators. I'm assuming that you screw in the terminal until the spark jumps the gap, and the scale indicates the approximate voltage (KV). There is a new Harbor Freight in Yreka (a dangerous place to carry a credit card). I'll check it out.

 

[DieselTech]

Yes you are correct, that is how this particular one works,