Valve size recommendations - Yamaha Raptor Forum
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post #1 of 5 (permalink) Old 06-10-2019, 09:07 PM Thread Starter
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Valve size recommendations

I have an 06 and I've sent the head off for porting and it's not too late to change the valve size. I originally asked for +1mm bit now I am thinking 2mm. What is the difference? Will a +2 be better?
Also have big 3, 11:1 piston, webcam and +3mm throttle body.
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post #2 of 5 (permalink) Old 06-10-2019, 10:39 PM
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Originally Posted by bristra View Post
I have an 06 and I've sent the head off for porting and it's not too late to change the valve size. I originally asked for +1mm bit now I am thinking 2mm. What is the difference? Will a +2 be better?
Also have big 3, 11:1 piston, webcam and +3mm throttle body.
Which web cam?
Youde likely need to go to a bigger billet throttle body for a +2 head.
Who is doing the porting? They should be able to help you make that decision.
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post #3 of 5 (permalink) Old 06-11-2019, 04:26 AM Thread Starter
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Quote:
Originally Posted by t web2007 View Post
Quote:
Originally Posted by bristra View Post
I have an 06 and I've sent the head off for porting and it's not too late to change the valve size. I originally asked for +1mm bit now I am thinking 2mm. What is the difference? Will a +2 be better?
Also have big 3, 11:1 piston, webcam and +3mm throttle body.
Which web cam?
Youde likely need to go to a bigger billet throttle body for a +2 head.
Who is doing the porting? They should be able to help you make that decision.
CT Racing is doing the work and they are using the 940c cam.
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post #4 of 5 (permalink) Old 06-11-2019, 07:55 AM
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I think I asked my dyno guy this question and he mentioned if in the future you are going to do like a 734 BigBore upgrade then do the +2, but staying stock bore stick to the +1.

Discuss with your porter though and confirm that theory.

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post #5 of 5 (permalink) Old 06-11-2019, 09:31 PM Thread Starter
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Thanks!
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