racing carb jet size

Ok. So, I got my new jets. I ran the #65 for several days, noticed signicant power boost, better mileage, and 3 - 4 MPH top end speed increase. With the larger head I have on my cylinder too, it didn't even get very hot. So, I decided to experiment further and try the #60 jet. Holy s**t! immediately got a solid 5mph speed increase, again! I'm monitoring the engine carefully though, because I don't want to overheat it and I do go for long rides. So far I only tested it around the block with the #60 jet a few times, nothing seemed to crazy hot, I could still touch the head momentarily. But I really don't want to blow up my engine.
 
I have an engine that I use a #60 on, it's prefect, no four stroking, tons of power, been using it for 100s of miles.
yup ive been using the #60 now and its even better runs great doesnt get too hot but i do have a big head on my cylinder
 
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