There are 421 cheetahs. Been a few come through here for sale but they are rare. Might be with calling and asking about. Theres also the option of modifying a 68x54 cheetah for the stroke.
Not sure where the whole single ring wossner thing people keep mentioning came from but mine and the rest of the standard banshee junk are 2 ring.
Good to know about the valves for the bigger cylinders. I was informed wrong.
For those wanting to run 110 rods with a 68mm bore wossner makes an excellent piston thats cheaper than the cp/trinity/whatever stuff.
More expensive to setup but far better for a playbike i think. As far as tuning its really no more expensive. The valves are tuned with a keihen main jet. I started drilling mine out until i liked how it felt.
Downside is they require a builder familiar with a cheetah to make the most of it.
I also prefer 68mm bore cheetahs to their bigger bore counterparts due to exhaust port width restrictions due to the valve. The bigger piston aggrivates this.
Torque. Small cc stuff is capable of impressive hp/cc but they get high strung and finicky. More displacement helps with this.
A ss cub would make for a decent duner and properly ported make for a fun dragger for a light rider. 421 cub is popular because its bolt and go fun with a decent price tag and is capable of impressive things.
No reason for a tz. New stock koyos in the center and ntn 10 ball maxloads on the outsides. If you are staying stock stroke the stock crank is as good if not better than anything else.
As in the example Pasi posted, big carbs on an engine that doesnt require them will usually require larger mains due to decreased velocity. My ported 392 cheetah uses 150 mains and is still rich.
That much timing advance is stupid for what he has.