I was thinking... could there potentially be rust in the gas tank (or even the oil tank)? Having set for five years, if they weren't prepped properly, they could rust inside, couldn't they? Not sure what can be done about that though if they are rusted - but I sure wouldn't want any of that crap getting past the fuel filter into the carb.

 

"Wet sumping", where the crackcase fills with oil due to a leaking oil pump valve, is a common problem. See: tpeng.com. Here is a transcript from their website:This is the first Evo-style oil pump that allows only filtered oil

into the engine by sending motor oil to the oil filter first. The

Smart Pump also uses TP's patented three-valve design to ensure a

constant flow of oil to the engine's bottom-end at any RPM. And with

the Smart Pump, Evo-style engine owners can finally benefit from using

10-micron Twin Cam® oil filters and trap particles four times smaller

than are possible with 40-micron Evo filters.

So what does the Smart Pump do that no other Evo oil pump does—keeps

your entire engine lubricated with filtered oil at all speeds and

enables you to use oil filters that will trap more dirt. Smart Pump,

smart choice!
Finally a Pump That Delivers Oil to the Crankshaft Forcefully at Idle!
Another TP Engineering Innovation
Conventional oil pumps shut off oil to the crankshaft at idle, and do

not start delivery of oil until 1900 RPM. T.P.Pro-Series patented

billet oil pump has been engineered to give your engine a constant

flow of oil to the crankshaft at any RPM. This patented design will

add life to your crank pin, rods, pistons, and cylinders by

drastically reducing operating temperature. By using a unique three-

valve system a proper amount of oil supplied to the tappets and top

end at all times. Another innovative work of art from TP Engineering.

TP Pro-Series billet oil pump is available as an oil pump assembly or

a complete kit with slotted breather gear and oil pump drive gears.