The Gap

[Don Williams]

Hello members, I put Dyna mini coils on my gs1100e and I wanna know do u run a bgger gap on the plugs? Thanks.

[rapidray]

You don't. Dyna recommends .020 plug gap on MOST models. Ray.

[ozgs]

These Tips were originally posted on the Cope Racing website, which no longer exist. They were authored by engine guru Greg Cope. Greg is the current crew chief on Geno Scali's NHRA pro stock Suzuki.
Many people missed these tips when Greg shut the site down, so the fact that he is a good friend, we thought it was OK to rip off his page and repost it for everyone to enjoy. The page will stay up until we receive the "cease and desist" letter from Greg's attorneys.
Most of this stuff applies to the older Kawasaki KS and Suzuki GS style motors.
Technical tips are given as a courtesy to the racer. Results achieved by these tips are the sole responsibility of the racer.
________________________________________


Spark Plug Gaps
When running a Suzuki or Kawasaki with a Dyna-S and high performance coils set plug gap at .026. When running an MSD or Dyna-4000 Ignition system set plug gap at .018.
Spark Plugs
Racing motors usually require a heat range one colder than stock. We recommend NGK plugs. For a Suzuki GS1100-1150 use a D9EA. For a Kawasaki KZ 900-1000 use a B9ES. With a Dyna-S ignition and aftermarket coils run a gap of .028. If your vehicle has a MSD box or Dyna 4000 ignition run a plug gap of .018 - .020.

[blowerbike]

very confusing post
i have always gapped my plugs@.018 and i have never been to gregs website.
geno scali hasn't raced in years and years and years.
again...
very confusing post

[gearhead13]

Hello members, I put Dyna mini coils on my gs1100e and I wanna know do u run a bgger gap on the plugs? Thanks.

That was my thought as well, that I could run bigger gaps (~.035), but I lost power and had some stumbling with the wider gaps, I set them back to .026 and it runs much nicer now. I might even try less gap to see what effect it has.

[ozgs]

very confusing post
i have always gapped my plugs@.018 and i have never been to gregs website.
geno scali hasn't raced in years and years and years.
again...
very confusing post

Sorry I should have explained. This was a cut and paste from another thread.

My understanding is that a stronger spark = bigger gap resulting in more torque.

[trippivot]

smaller gap with dyna equipment.

Hello members, I put Dyna mini coils on my gs1100e and I wanna know do u run a bgger gap on the plugs? Thanks.

I like to run .024"~.026" more or less than this range will cause weird tuning issues you may or may not sort out.

fatter gaps are for less efficient combustion chambers where the flame front needs more time to spread across the piston crown. Fatter gaps put huge stress on the coils, and increase the potential for improper combustion.

the TSCC is still at the top of the list of efficient combustion chambers.