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So I picked up a pair of 67 S90s this weekend. They were previously stored in a pole barn out of the weather in indiana for at least the last 20 yrs. They're in excellent shape, there's still oil in the engines, and they turn over when I push the kick start. Is there anything I should do/check besides clean the tanks, carbs, and air systems before I try to start them?

I would suggest adding an inline filter between the tank and the carb. When you clean out an old tank, it often loosens up some of the rust/goop that has accumulated inside. It's nearly impossible to get every little bit of it out, and it only takes a small particle or two to ruin the nice job you did cleaning the carbs.

I've heard of a mix you can put in a tank that will coat it, and stop the inside from corroding or flaking. Would this stuff help? The inline filter is definitely a good idea! Also, should I tear the head apart and check valves, piston, etc, or try to start it to see if it works first?

Get your fuel system sorted. Change the oil !!!!!!

If they run, all you may need to do is adjust the valves. Don't take anything apart that you can't put back together again! (i.e. make sure parts are available if something gets messed up)

sparky wrote:I've heard of a mix you can put in a tank that will coat it, and stop the inside from corroding or flaking. Would this stuff help? The inline filter is definitely a good idea! Also, should I tear the head apart and check valves, piston, etc, or try to start it to see if it works first?

thats the POR treatment.... I used it in my Yammy and havent had a problem... just make sure you put soemthing in the screw holes where the petcock attaches or the sealer stuff will plug them...and if you use the screws themselves, tkae them otu before it hardens.. (learned the hard way abotu that)

There is also a product called "Red Sealer" which is good for sealing old gas tanks. Most good radiator shops can do the job. I saw some old Triumph tanks at a booth in a swap meet that were done very well. The treatment carries a ten year warranty. XS