Double Oil ? Is this 100:1 ? I ran 40:1 for about an hour now the engine at times will not turn with the starter seems tight ? I can however turn it with my hands and she fired right up. I am afraid the motor is locking up on me so should I increase it to 100:1 the rebuild company told me to use 50:1 , I decided to play it safe and run 40:1. Your thoughts ?

if 50:1 is normal, twice the oil is 25:1

25:1 is double oil. I quit double oiling awhile back as I had 2 engines seize up on me from double oiling. Oil burns hotter than gas does and also makes your fuel mixture thicker which causes your engine to lean out under load. It will also cause excess carbon build-up if you don't run some sort of de-carboning additive through the fuel.

Thanks guys, Ferm should I use 40:1 or 25:1 ? I did see some carbon on the plugs from the 40:1 with just under two hours on it ! I am really concerned about the lock up on the engine ?

i'd run 25:1 up to you that's what i've run in all the motors i've rebuilt with never a motor issue.

Help !
 

I install a rebuild power head , during the break 24:1 oil premix , If I run the engine for hours variable throttle the engine runs like it should, shut-off fires right back up , however if I let it sit for 15 to 20 minutes it will not crank period , manually turn the engine my hand tight i can feel it.
Once it cools down from 145 degrees to 120 degrees it fires right up
Question is is this normal ?
I am certainly not overheating since 145 degrees for a block that is just shut-off I have new gauges and senders installed on both starboard and port side of the block , At the time of the shut-off the temp is 130/125 , with the engine off it rises to 135/145 that's when it locks up not even the starter can turn it .
Should I be concerned or this is normal ?

I would be concerned. Who did the build? Sounds to me like somebody didn't check the ring end gap and the rings are sticking once shut off. And 145 is not even remotely hot for one of these engines, IIRC it should be running around 150-160 at idle and then drop off to 100-125 above 3000.

Powerhead Exchange in Tampa ..

They used to do good work, I used to use them as my machine shop as well. Was it Lou you dealt with or Vaughn? I have had some problems with pistons that I got from them in the past though with em sticking for no apparent reason.

It was Vaughn seems like a real nice guy, But its time like this when one is expose , I left a voice mail for him so far no return call ..