Big Problem: Engine Overheating after Rebuild

[Blown 97 GT]

Well i got my top end back from the yamaha shop yesterday and got it all put on today. Well the guy there told me that my cylinder was on its last bore and couldnt be bored again. When i got it all on and ready to go, i drove it maybe 1/10th of a mile down the road and back barely on the gas, and the head got so hot in that 30 sec ride that you couldnt touch it with your hand. Is this because of the last bore? Should i take my other cylinder and get it bored? Or is this normal when breaking a fresh top-end in? Please help! I have a full pro-circuit exhaust and a 310 jet for engine mods.

 

[kylepotatoes]

Did you break it in before you rode it? And make sure you have oil in it too or if you have a block off kit premix in it.

 

[blasterfreek30]

if its on the last bore, then yes that explains why its that hot, the cylinder wall is very thin

 

[Blown 97 GT]

Is that safe to ride or not? Its pretty damn hot i've never felt one this hot after a minute of riding. I havent had the chance to break it in yet, thats what i was in the process of doing...

 

[blasterfreek30]

i would bore the other cylinder u have, that .090 over is gonna last at all