matt1 Posted January 27, 2013 Report Share Posted January 27, 2013 Can a stock head be cut for a 4mm on pump gas(I am at sea level)? Does anyone know if a prodesign head makes the spark plug sit any higher than a stock head? I barely have enough clearance with a stock head on my hybrid between the gas tank and the sparkplug boot. Quote Link to comment Share on other sites More sharing options...
Finch Posted January 27, 2013 Report Share Posted January 27, 2013 http://www.mullengineering.com/sc/store.php/products/yamaha-banshee-yfz-rz-head-mod-billet-cut-modify-machine-squish-dome-plug-heat-race-drag-online-modify-modification 1 Quote Link to comment Share on other sites More sharing options...
matt1 Posted January 27, 2013 Author Report Share Posted January 27, 2013 Thanks, I was told by another sponsor that they would not cut stock heads and that they did not recommend doing it on a 4mm. Any ideas why? Quote Link to comment Share on other sites More sharing options...
Finch Posted January 27, 2013 Report Share Posted January 27, 2013 No idea but i have heard good things from mulls cut heads. most prolly dont do it cuz many dont actually cut their domes the calculate them and order them Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted January 27, 2013 Report Share Posted January 27, 2013 X2 for Mull. There is nothing wrong with cutting a stock head and re chambering the domes. I had to use a stock head when I ran my Big bore motor and it even ran about the same temp as the PD cool head Quote Link to comment Share on other sites More sharing options...
01bansheefox Posted January 27, 2013 Report Share Posted January 27, 2013 My builder McCoy recommended cutting stock head vs going aftermarket for my 4mil im going to have him do. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted January 28, 2013 Report Share Posted January 28, 2013 McCoy is one of the best. There's an opinion that holds weight. Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted January 28, 2013 Report Share Posted January 28, 2013 I have personally had a few heads cut for 4 mil by mull engineering,you will not find a more knowledgable guy on dome design and his heads are top notch work there are a few site members bikes that I have built running them with no issues,and going three seasons strong Quote Link to comment Share on other sites More sharing options...
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