Ok piston experts!! Lets here it!

[Boondockin800]

Just got done rebuilding the top end of my 04 king after I cold seized it. Ran great for half an hour and then this happened. EGT's were reading about 1150 degrees and I did premix the gas in the tank.

Lets here it...

 

[RKT]

Just got done rebuilding the top end of my 04 king after I cold seized it. Ran great for half an hour and then this happened. EGT's were reading about 1150 degrees and I did premix the gas in the tank.

Lets here it...

You have too much timing.. Ifyou have an offset key installed.. take itout or put it in backwards

 

[chris587]

Or run higher octane gas. I have a few that look like that

 

[alpineterry]

timing, detonation

 

[Boondockin800]

oh
didn't even think of that. I'll have to talk to the previous owner to see if he put one in.

(just noticed that I spelled 'hear' wrong...)

You have too much timing.. Ifyou have an offset key installed.. take itout or put it in backwards

 

[Shelfrost]

I had an old zr580 that would blow holes right through the pistons. Found a chunk of rubber in my fuel pump, (after a few pistons and buying a fuel presure gauge). Would drop to 0 psi on a wide open pull and boom. No fuel = holes in top.

 

[sledmasterr]

Det... what altitude and fuel?

 

[Monty]

Better fuel or less timing.

 

[switchback]

same here. Timing and/or fuel. That sucks~sorry man.

 

[JMCX]

EGT's will drop while detonation is occuring. How old is the gas, was it from your usual source?

 

[KMMAC]

What are the air screws set at?