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Topic:
Bigger valves in F2 head
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Topic: Bigger valves in F2 head (Read 1283 times)
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dragracer
Really Old Timer ...
Posts: 5,070
CB750F Dragbike
Bigger valves in F2 head
«
on:
April 06, 2011, 09:59:02 am »
Is it possible to put larger valves in the F2 head on the stock seats or to install larger seats to accommodate bigger valves?
?
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classic bike tuner
Enthusiast
Posts: 113
http://www.cmrch.nl/
Re: Bigger valves in F2 head
«
Reply #1 on:
April 06, 2011, 10:32:22 am »
yes is possible : i have used mitsubishi valves 35 mm are to long need to be shortend and new groove for the collets after that the tip needs to be hardend with stellite [welding]
these are 6,5 mm stem
http://cgi.ebay.com/ebaymotors/4G63-stainless-valves-stock-size-H-P-Eclipse-Turbo-_W0QQcmdZViewItemQQhashZitem588d5a956cQQitemZ380328645996QQptZRaceQ5fCarQ5fParts
you get a complete set of 16 valves so you can do 2 engines
«
Last Edit: April 06, 2011, 10:34:33 am by classic bike tuner
»
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kos
Hot Shot
Posts: 718
Re: Bigger valves in F2 head
«
Reply #2 on:
April 06, 2011, 10:43:14 am »
We ran an special F2 head with 35mm intakes and 30mm ex valves on standard seats. We went down on EX valve from 31mm to 30mm to make sure we had enough clearance between valves at different valve events. Intake went up from 34mm to 35mm.
KOS
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220...221, whatever it takes.
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Topic:
Bigger valves in F2 head