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6H5...50 hp YAMAHA CYLINDER HEAD....AFTERMARKET VS STOCK

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Hounddog
 PostPosted: February 6th, 2020, 5:20 pm   
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Anyone run one of these??
http://www.boatracingfacts.com/forums/s ... 70CES+head

Similar to the stock centre plug head with smaller volume
https://www.ebay.ca/itm/Yamaha-50hp-2-s ... aQ&vxp=mtr

Has anyone tried to cut the stock head to achieve 160 lb compression??
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DoktorC
 PostPosted: February 6th, 2020, 8:25 pm   
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Joined: March 31st, 2012, 5:53 pm
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Location: Lapping lil charger
Hounddog wrote:
Anyone run one of these??
http://www.boatracingfacts.com/forums/s ... 70CES+head

Similar to the stock centre plug head with smaller volume
https://www.ebay.ca/itm/Yamaha-50hp-2-s ... aQ&vxp=mtr

Has anyone tried to cut the stock head to achieve 160 lb compression??


I have a center fire P50 head but it's stock...I'm not sure you could cut it enough without getting into the squish to achieve 160lbs.

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Roflhat
 PostPosted: February 8th, 2020, 5:30 am   
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Joined: July 26th, 2015, 3:49 pm
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I ran a TSR head on my 70ces, was down on compression compared to my standard head, never got the performance from it. Maybe if you got smaller chambers for it, was at 125psi with TSR, 150psi with CES head
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