Originally Posted by THE DOCTOR
I have ran the OS TZ through many gallons of fuel and I would say that it is one of the most reliable engines that I have ever ran. I have won at least six 45 minute mains with this same engine. Performance on the other hand, it is not close to some of the newer engines out there today. I just am lucky and stay out of trouble.
yes this is true if you remember i did blow 2 of them last year but my fault i was trying to make them go faster than they can to keep up with guys running faster motors
they are a good motor but dont push them.