Who's research showed such b/s?.Why is it then that all the engines YOU list on your site as having ideal timming ALL have a squish band?Why is it then that ALL small displacement performance 2t's have a squish band, Are you saying all these manufacture's are wrong and that you know better than they do!You can say that I'm part of the wolf pack that pounces on you,But what do you expect when you constantly contridict yourself.
Street Ryder, an ingeneer I also double about it, but I have tested improvements Jaguar have concluded after a huge research and I can tell you, the Industry of motor kits is making a lot of things wrong conscientiously in order to sell you stuff that doesn't gives you the power and that makes your cilinders, pistons and bearings run faster... China is an production oriented country, not a marketing oriented one, that means that don't give a damn about it some improvement gives to someone value over their investment.
Said that, as engineer I am, I have to research if what Jaguar says is right, in another places, scientific papers and research from professionals like Jennings.
And also I have to make my own calculations to test if the theory fits 48cc 50cc and 66-69cc. Done that then I do modifications and measurements to test the results, and confirm not only Jaguar's ones but also, Jennings, my own and other people researchs to be sure stuff will not crack, brake, burn, explode, or run out quickly.
After oil mixture and carburacion, Timming is everything in 2 strokes... Spark energy, spark maximum gap, exposure of the spark to the mixture, spark duration, are all electrical stuff that comes second but will give you a lot of power if you have the know-how.
Next are porting, bearings change, mufflers modifications, intakes elongations.
By last reed valves, and piston modifications, together with a few more sofisticated stuff that will give you a plus and will gove you a smoothly run.
I can tell you also that bike Motor kits have a lot of flaws, because I corrected 2 factory defects in the muffler and the intake, and gained 58% more, also corrected the spark plugs and gained 200% power output in high and low revs.
BTW: best spark plug gap so far is 0.093" or 2.362mm. bit biu need a powerful CDI to acccieve it, imposible with the stock one.
I have tested compression heads and I'm getting more from a standard off-set cilinder head, due to technical improvements than in my twin (control for the tests) motorbike without improvements (except for cilinder head, that is supposed to give me high compression).
The point is, a lot of stuff is being sold, and a lot of stuff is made wrongly on porpouse ofof y having to buy the "enhancements" they sale, and ending with a Frankenstein, bigger than the necessary to get the same.power from more elegant and refined modifications.
Cilinder heads are not the exception, because stock ones are easy to brake and gets deformed by the pression from the head bolts. So grind them 0.05mm from the base before installing and seal them.
Squish bands are not the exception, also; for our engines poorly fabricated, a squish clearance must have at least 0.015" or 0.381mm, but how will you have that with a deformed dilinder head with variations of .03mm between the cilinder front, rear, and sides?
Practically impossible with the stock ones, but with the CNC ones.
In our stock motors with our stock cilinder heads, squish bands seems to be merely for cooling (very necessary if you get higher RPMs).