Piston and Head. How does this look?

[Varmint]

The RB gear looks sweet!

Yeah it does.

[Mr. Wibbens]

Wiseco says Use what you normally use

I could not find any definite reason to use dino for break-in

[Brian]

Make sure the cylinder is clean inside (you used the Scotchbrite with WD40 didn't you?!), lube the wrist pin and bearing when you install it into the piston and put the cylinder onto the engine/piston completly dry. No oil at all (except the wrist pin). The oil mixed in the gas will coat the cylinder as soon as you kick it over. You don't want the cylinder and piston coated with oil because as soon as it fires any excess oil will load up the cross hatch pattern and slow/prevent a proper break in. Start it and ride it. Someone had a link to an article about engine break in and they said to run it hard right from the start. I've tried it several times (it's really hard to do the first time...made me cringe) and had very good luck.

[Mr. Wibbens]

First I've ever heard of putting it all back together dry

[Julien D]

Really? Lots of people go for the dry assembly. The idea behind it is that excessive lube in the cylinder can cause premature glazing on the cylinder walls which prevents the rings from seating quickly/correctly.

Personally I think it's fine either way. I lube the ring lands and rings along with the piston pin, but I do not coat the cylinder with oil or anything else.

[Brian]

I've used the dry assembly many times on 4-stroke 4 and 6 cylinder engines. Lube the heck out of the bearings and a drop of oil on the cylinder skirt and fire em up. You get an engine that does not fill the neighborhood with smoke on the first start. Let it run for a minute or so at several thousand rpm and start driving.

[Brian]

Oops, I meant piston skirt, not cylinder skirt.

[IdahoCharley]

First I've ever heard of putting it all back together dry

Use to be a school of thought that you assemble the cylinder and piston rings dry and then use an electric drill, or even a speed wrench, to turn the piston over in the cylinder 200-300 times to get the initial seal established between the rings and cylinder. This would be prior to ever feeding any mixed gas into the cylinder.

[fuzzy]

Yeah, that's for true old school 'break-ins' All we're doing here is a ring seat. Nothing else is 'breaking in'