[xlint89]

This is great first hand info guys, keep it up.

Johnny, I've read that guys that run the big cc motors like the 180 kinda give the engine time to cool down. There's a lot more heat being generated along with thinner cyl walls as compared to the stock engine.

An oil cooler would benefit you greatly. Maybe do a little research and see if the "performance" cooling fans actually work? More air flow over the cyl fins should help cooling. I was also told to paint my cyl flat black as that's was supposed to help pull the heat out. Might be worth looking into????


Slestak, you got 45 MPH out of your 150cc? That's GREAT. The head mods and port matching had a lot to do with that, but that's still got to be the fastest speed I've read from a stock sized 150cc.

My Yerf I thought was running pretty good and maxxed out at 38 MPH. Another 7 MPH gain over that would be phenominal. I think Metalstudman posted a top speed of 40 MPH on his stock Yerfie. You have a good runner there.