Stock motor is not going to make that much diff. I use premium. How much oil are you using, and did you look at reply 32? Also can you give Ryderzs question a reply as to weather or not the plug is wet after you try to start. It's need info for a good trouble shoot.
Mph is deceiving but anyway I could hear in the video that as soon as the clutch engaged and engine started turning over it got slower and slower until stoped! When it should be a constant rpm for a bit so that it can pull the fuel thru and breath for it to fire up especaily the first time starting!when its broke in and jetting is right and all is good then it may start up like that!
.028". I've built over 100, and god knows how many repairs. I'll go .035 with a external coil, but I usually just grab a head gasket that's laying near by on a new build. They run between .027 to .029. On a new build it works every time.
It should still fire on the 16 to 1, but you don't need that much oil for break in. It should be 6 ozs. per gallon for break in. I know the manufacturers suggest 16:1, but their halfwits it's too much.
Saw the video. Carb. looks fully seated. Some can be a bit more of a b**ch than others on the first start as far a continued pedaling. Can't wait till this one is running. If that plug is wet, the comp. is good, And your getting good spark it's almost got to be the magnet slipped on the crank ie timing. Hate asking dumb questions but their is a gasket at intake to cyl.? If all this is failing we would maybe look at crank seals.
I use the amsoil full syn. 4 oz. and a little 3/4 oz. NOS octane boost per gal. I'm a creature of habit so I just stick with what I know works. Can't say it's the best. It just works. Got a clean used bike in that came with a gal. that had bubble gum scent in the mix. No diff. in performance, but it sure smelled good.
