Originally Posted by Roelof
How is the lifespan ?
The engine can cost 150 dollar less but if you need 2 of them against 1 Novarossi then it is not cheaper......
i had raced all the past season with one engine , the 12tz speed spec 2 and the only thing i replaced for about 19 litres of fuel is the conrod which i replaced it twice..
the new engine has almost the same parts and is made of the same materials except for some differences in the crancshaft , the carburater , the piston and sleeve etc but the materials seem the same...the difference is that the case is much stronger and durable and this is the reason why the engine weights about 30 grams heavier than spec 2...
so according to the theory thing the XZ should be even more durable than spec2
these make us a good value engine.....till now i have only used the engine for about 3 litres.... time will show
Moreover , have a look in the NOVAROSSI thread to see a new engine "353 tuned" destroyed because of gap between the conrod and the crancshaft...so i don't think that "if you pay more you play more"...the engines are made of metals and noone can predict when the "bad moment" comes!this is the reason why none of the engines caome with a kind of guarantee or something...no guarantee for anyone!