im just posting what i find when i open these engine or what others around my area that build these engines find
i know i will not recommend a TZ bearing to anyone i build a engine for ... if its working for you good,but in these neck of the woods i'LL take ball bearings
2 was done buy me
3 was done by 3 different builders
1 was a engine bought off the net,already together
maybe we all did something wrong