If a lean condition cause that crank tin to come off, be the first one I've ever seen. Those crank tins just give up after a while & it dont make no difference who owns it or if its Wiseco, Hot Rods or TRX OEM.
Something as small as a slight ding, on the outside of the tin has an affect on that tin. To understand it easier, say like your doing body work on a car & got to hammer out a dent, every time that hammer hits the metal it expands that metal some & in turn deforms it just a bit. If a lot of hammering is needed, your really getting into deforming the metal then.
If several dings are on the tins or say like one big one, it looses that tin on the crank & with all the jerking & snatching the crank will see, that tin will start to shift & once it contacts the big end pin, it will start to shear & crack.
Welding the tin to the crank web, is the only insurance that is wont come off the web. There may be cases where it has, but I dont know of any.
When we pump these engines up, we need any kind of insurance we can get to keep a part from failing. We cant be like the factorys on our quads & trike 2 strokes, build failure into something, so we can stay in business like they did years ago & even more so today with these new 4 pokers.
Neil
