For $70 it's not a bad engine, but it wont have the power or the reliability that your TM has. It will be a little harder to tune at first but once you get it tuned it should be alright. For $70 it houldnt be a bad engine just you wont have as much power as the TM does. But if you save about $50 more you can get the TZ from towers and that will have more power then the TM. But thats up to you.