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View Full Version : Over size Intake or just exhaust? 07 450R


OutlawEX
11-21-2006, 07:19 PM
Ok i am sending my head to get motor work. Need to know where to go over size or do both over size on my 2007 450R? Please let me know what you suggest for MX and most HP.
chad502ex
11-21-2006, 08:09 PM
i would hope your 'porter' would know that answer so you dont have to ask...

jmo.:ermm:
czrider263
11-21-2006, 09:07 PM
Originally posted by chad502ex
i would hope your 'porter' would know that answer so you dont have to ask...

jmo.:ermm:



Ture!!

plus i would watch what motor builder you send it to.... you may not see it again.If i where you i would prob send it to ^^^^ that guy Just my 2 cents

Also i don't know if going with bigger vavles is a good idea in the first place.
OutlawEX
11-21-2006, 09:49 PM
My builder built a Pro TT motor that ran in the Pro Class All year. He wants to use Titanium over size valves in the Intake and exhuast. However the Titanium has not held up for ANY pro rider in Motocross.. And also this is his first MX Motor. So i want to make it right. He wants opnions to see what people are using for MX. Simple question
czrider263
11-21-2006, 10:27 PM
I think that my titanium vavles will hold up because they are DLC coated
fandl450r
11-22-2006, 07:31 PM
I run +1 MM intake side, and stock size exhaust. A larger intake valve is said to help build torque. No problems here. I did upgrade to dual rate valve springs though.
OutlawEX
11-22-2006, 09:24 PM
Originally posted by fandl450r
I run +1 MM intake side, and stock size exhaust. A larger intake valve is said to help build torque. No problems here. I did upgrade to dual rate valve springs though.

Is that what alot of people are doin for MX? What brand did you use?
Dave400ex
11-22-2006, 09:29 PM
Are you talking about Fischer's Cycle?
OutlawEX
11-22-2006, 10:32 PM
Originally posted by Dave400ex
Are you talking about Fischer's Cycle?

no sir~:scary:
fandl450r
11-22-2006, 11:02 PM
Originally posted by OutlawEX
Is that what alot of people are doin for MX? What brand did you use?

Thats what my motor builder uses (Quinn Motorsports). I run the Kibble White stainless steel 1 piece valves. For strength, and the fact that titanium valves can get pretty pricey lol.
Chino886
11-22-2006, 11:37 PM
Originally posted by fandl450r
Thats what my motor builder uses (Quinn Motorsports). I run the Kibble White stainless steel 1 piece valves. For strength, and the fact that titanium valves can get pretty pricey lol.

my bike is the opposite, +1 mm ex!
chad502ex
11-23-2006, 08:41 AM
Originally posted by Chino886
my bike is the opposite, +1 mm ex!


ding ding ding......


its easy to get the charge in, but tougher to get it out....