When you say your stock base, what jug are you using? MXS? Can't be stock since I really don't think you're beating a high compression race gas Frank with w a stock 47mm/40mm stroke kit on gasoline. Not gonna happen. Franks spin to over 10k and make north of 10hp. Even a fully ported balanced crank chinagirl tops out around 6.5ish hp. The jug just can't be ported enough to flow what a high rpm screamer needs. Now if you have a sleeved 50mm motor w/ completely maxed out transfer ports and a case reed, you might be able to compete on top end power but it would still have way less low end...it would be gutless down low since you wouldn't come close to the compression of a purposefully built race gas frank and compression is what really helps the low end once you open the transfers up for top end HP. Like MBR said this really is a case of "Prove it" though so I'd love to be proven wrong and see your Frank killing 69cc gas kit!
That vid doesn't show anything BTW...a random group of people all starting at different times in different lanes of a public highway...show me race track or competition events.
^^^^^
If you are interested in drag racing, which is not popular at all with these gutless motors, if you get the dragy box(its $140 and about the only trustworthy performance measurement tool) I'll be happy to compare 1/8th mile or 1/4 mile times with my next build but it will be a 4stroke not a 2stroke. Dragy box + corresponding video is all I will trust...not phone apps, chase car dashboards, or untimed youtube vids. You'll have a huge weight advantage since it will be a commuter not a race bike so will be overbuilt for reliability and very heavy (moped wheels, DOT motorcycle tires, steel gusseted frame, CVT, etc). It's still months out since I have other projects to finish first, so lots of time for you to make mods and tweaks!
