Originally Posted by
Chedster
Today I ran tank #3 thru my 5 port. I am using the break in on page 78 with no problems. Only thing I did is not run alum foil as it runs near perfect temps without it. After cooldown I took a peak at the plug and noticed some metal shavings on the bottom of it. When I first started break in I had no heat gun and quickly realized it is not possible to break this motor in without one. So after gettting a heat gun I had no problem cranking it. But before this I had to use a screwdriver to get the flywheel unstuck. Are these shavings from me forcing the piston thru the top of the sleeve? Before breakin I did a quick cleaning of the internals with nitro cleaner. Unless I missed some shavings? Should I pull apart the motor and clean it out again? I dont like the thoughts of loose metal shavings in my motor.
The meteal shavings, where they fine grains? it can be from the piston, the sheer from the outside dia of the piston as it pushes through the pinch, thats why i stated to use heat before cranking the engine, if you sprayed the engine out with nitro clean, i would strongley recomend replacing the bearings, and flush the engine out while the bearings are out, this will eliminate all the trash, and spreay the wrist pin and under the piston as well as the rod bushings, and then install the new bearings and use some after run oil upon reassembly, the temps you saw during breakin are a cause of the carb being set to lean out of the box, with proper needle settings during breakin, the fat fuel mix will cool and shrink the sleeve into stalling the engine from being tight at TDC. Hope this helps