Recent content by bwalker

I have been on that BITOG for for over 20 years. There are a few guys that know what they are talking about. The rest are a bunch clueless OCD weirdos.

Guys love to bash anything new....

Red armor is a a decent oil, but there are alot of decent oils out there.

Where does it say FD?

Those new tangled saws are all junk with low quality bearings dontcha know.... that and mtronic/autotune/ strato/ efi are epa sorcery!

And probably why I never had an issue with the very early 562 I owned. There are guys that can eff up an anvil.

The crankshaft in question run for years flexing like that. Very rarely break. Its hard to stress enough how heavy those pistons and cranks are. The bore and stroke is 86mmx86mm.

Flexing crankshaft rarely break. They just are not rigid enough. You could be absolutely right on the heat thing. Have you seen any 550,562, and 372xt fail when ran at 32:1? Lastly, I am glad you posted this. At least we can out the low quality bearing thing to rest.

Are you seeing this with 372 XT only?

I answered your question.

Its not bending. Its constantly flexing with each stroke. In certain engines, the Suzuki LT500r being one, bearing pocket liners are often fitted to help with this. Jerry Hall uses some sort of plastic to do this. So yeah, its a thing. Of course other things may cause it too...

To dumb it down... Part failures are not always due to quality because design elements and other factors have a say.

Wallowed out bearing pockets are typically caused by the crank flexing, which makes sense given the heavy pistons.

Many of the saws with these bearing issues have been ported with much higher gains than 15% and lasted just fine.

Both. Even the highest quality bearing won't last when exposed to loads too high and lubrication less than optimal. The 372 XT is an example. Its had some bearing issues while the OE 372 very rarely had issues and they are basicly the same saws minus the strato feature.