13/1/6 Saito 4-stroke engine Excerpt from RC-universe, from the Club Saito thread; I've got two Saito FA91 engines mounted on planes which have not been flown for two years. Didn't use after run oil, just primed them a little extra after the last flight (OK, hit me!), so the engines are both blocked now; it appears as if the bearings are fine, but the cam followers are/were completely stuck, thus blocking the cam. Probably corrosion of the brass tubes in which they are fitted. Is this a known saito problem, and what is the best i can do to get the tolerance back in the 'green area' again? ..Put some fuel in the crankcase and try to make it flow to the cam? Remove the valve covers and coat everything with fuel and put some fuel down the rocker arm tubes. See what you got? May take a few days? If fuel is too expensive, just use some methanol or solvent of some sort. ..I agree. Just flood it with penetrant. Like WD40; Break Free; Maltby; LocTite; 3M; etc. Take your choice. I would remove the valve covers and spray it down the pushrod tubes and flood them. The penetrant will leech over into the cam followers. Spray it into the oil drain nipple again flooding the engine. It should work through the rear bearing into the cam gear. You could also remove the grub screw locking the cam gear pin in place and add some penetrant there so it leeches into the cam gear bushing to help free it up. ..Martin, I have a Saito 100 which is why I'm a member but... I have a 20+ year old Enya 60 4C that I'm going thru. I know they are built different but my lifters were stuck, stuck, stuck! I tried everything until I finally took the cam cover off which holds the lifters and dropped it in a small cup of fuel. In a matter of an hour or so they became unstuck. Fuel seems to work the best, which I guess is the methanol. I don't know how much of a role the nitro plays. Good luck getting your motors running again. This thread is a great resource for help in getting them going again. Oh, another thing I discovered. When folks say to run the fuel out of them I always thought "yeah, yeah right...how much fuel could be left in the thing". Well, I have started to run the engine dry after pumping the tank empty on my 1.00 It surprised me how long it would run. There is enough fuel left in the engine to make it a wise thing to run it out. Good luck! ..I take the carb bracket bolt out of my Enyas and shoot Corrosion X in the gear box to prevent rust and congealed castor. I had really rusty gears in my .46 MKII and the Corrosion X solved the problem, then and ever since. The fuel didn't dissolve the oil, so i had to disassemble the engine, gently loosened the followers with some force, and lapped the interior of the brass tubes (probably corrosion). Lapping Cam followers last edited 12 januari 2006 mail the editor