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speedracer
If your Iridium spark plug gap is .026" it's fine.. I have 3 different manuals for GY6 157QMJ engine w/ NGK C7HSA or Iridium spark plug that recommends a gap of .6mm (.024") - .7mm (.028").. Now I do have one manual for 125cc GY6 w/ a CR8EH-9 spark plug recommending a gap of .8mm (.031") - .9mm (.035")..

The Chinese standards are all over the place, & the same goes for the information written to CD or even the Haynes repair & service manuals..

Now w/ all that said, that doesn't mean you can't play around w/ your plug gap... Some times a different gap w/ make a difference for the better..

Now if you're using a standard NGK C7HSA spark plug or similar plug, I recommend side gaping the plug w/ a gap of .014" - .018", which will preform nearly as well as the Iridium spark plug & is tougher.. Side gaped spark plugs have been used for high performance racing & in 2 stroke engines for many years.. So for those of you who don't have the $12.00 to spend on a high performance Iridium spark plug, I recommend side gaping your spark plug..

David Sr.