@ NEW_STYLE ULTRA_HEAD (OLD_70_DOME) CRF50_TYPE_CAM SEE_APPLICATIONS (100006) temp out of stock

!!!NOTE!!! READ WARNING BELOW !!

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IF YOU USE ANY CAM OTHER THAN OUR ULTRA_CAM (200033) YOU

"MUST" CHECK THE FOLLOWING DETAILS!!!!!!!!!!!!!!!!

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1.__When the valves pass each other there is at least .015"

or more clearance between them at the closest point.

IF NOT DAMAGE WILL OCCUR, TO FIX THIS JUST GRIND DOWN THE

OUTTER EDGE OF THE VALVES!!!

2.__MAKE SURE WHEN THE CAM LOBE IS PUSHING THE VALVE ALL THE WAY DOWN

THAT THE VALVE SPRING DOES NOT BIND "COIL TO COIL" THIS WILL ALSO CAUSE DAMAGE!!!!

USING OUR (200149) SPRINGS CAN ELIMINATE THIS PROBLEM..

THIS IS OUR BIG VALVE BIG PORT BIG DOME ULTRA PERFORMANCE HEAD!!!!!!!!!

THIS IS A NEW HEAD WITH THE VALVES, GUIDES, SEALS, HEAVY DUTY SPRINGS, SPRING KEEPERS AND VALVE COTTORS ALL NEW AND INSTALLED!! YOUR ROCKER ARMS AND PINS WILL WORK.

THE INTAKE PORT OPENING IS 22MM AND KEEPS THAT VOLUME ALL THE WAY TO THE VALVE FACE!! THE INTAKE VALVE OD IS 25MM..

THE EXHAUST PORT IS 19MM AND AGAIN KEEPS THAT VOLUME TO THE VALVE FACE. THE OD OF THE EXHAUST VALVE IS 22MM..

THIS ULTRA HEAD IS CLASSIFIED AS AN "OLD 70 HEAD" TYPE DOME..

IT REQUIRES A "BEARING TYPE" CAM!! (not included)!! THE STOCK CAM FROM 1988 AND NEWER 50'S 70'S AND PULL START TRX90'S WILL WORK, BUT!!! FOR MORE POWER GET OUR "ULTRA CAM" (200033)

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!!!! NOTE !!!!

replacement VALVES AND GUIDES listed below on this page