There several brands of good assembly lube. As Nitro - I like the Redline product and have used their lube in a lot of two-stroke motors, but never four-strokes. When you fire a race built 125cc for the first time it’s critical for everything to be lubed. Those little water cooled buggers put out in excess of 60 HP and see 10,000RPM on a regular basis – but we sometimes rebuilt every other race!

I'm mostly a Chevy guy and have used GM assembly lube (AC/Delco Part # 1052367) as it is recommended by GM and the boys at Scoggin Dickey. They (Scoggin Dickey) do not like Redline and in fact have the following to say, re: Redline:

“And FYI, Redline is NOT one of the oils we recommend that have the high levels of zinc/phosphates. We've seen engines broke in with similar oils to theirs that after less than 1000 miles, look like they have 100K!!”

Lubriplate No. 105 Motor Assembly Grease is also good and I know several machinists that swear by it as well as Goodson's – which is a Teflon-based lube.

I always use the cam lube supplied by the manufacturer when installing a new cam. The contact area between the lobe and lifter is really small. The valve springs create a great deal of pressure through the valve train when they open. Cam lube is a high-pressure lube designed to protect the cam and lifters from damage on initial start up.

In my opinion, the brand is not as important as is the need for keeping the assembly absolutely spotless.

My two cents,
Glenn