stock porting vs. heavy porting

[chad502ex]

Hey all! got some pics of the 450r porting in stock form before the head was sent out for +2mm oversized intake/+3mm oversized exhaust port/flow work.

Just wanted ppl to realize that the 450r cyclinder is only able to accept +1mm intake/+2mm exhaust valves until the cyclinder is replaced with an oversized custom cyclinder to accept +2mmin/+3mm ex. So if your ready to port/flow with oversized valves be sure that your valves do not slap the top of the jug.

Enjoy!

in stock form,...

[chad502ex]

stock intake side

[chad502ex]

better shot at stock intake side

[chad502ex]

nasty look'n stock exhaust side

[chad502ex]

with stock exhaust valves removed. notice thin silver line on the exhaust valve seat. it should be 1mm wide at a minimum. This was from the factory that way,... time to lap in the valves if you weren't getting head work done

:ermm:

[chad502ex]

this is nice shot of stock 450 porting without valves.

[chad502ex]

this is after port/flow work done on my friends 550r head done by NMotion. They installed +2mm in/ +3mm ex. In this shot you can see that they releived the dome area of the head larger to allow for the larger sized valves. This valve relief removed a little head metal which affects compression a litlle. The valves are Titanium with stock CRF seats. My head will have stainless steel valves instead of Ti for longevity. Ti's are lighter but are not really that huge of performace advantages; plus, they cost $400 for custom size (ouch!).

[chad502ex]

550r intake after porting

[chad502ex]

another look at valve stem and guide on 550r intake after porting.

[chad502ex]

not a very good shot, but here's the 550r exhaust side after porting.

[chad502ex]

Ti valve and CRF seat

[chad502ex]

coated Ti valve

[chad502ex]

550r exhaust side with valve removed

[chad502ex]

550r intake valve lifted to see seat.

[chad502ex]

550r intake side flow- looks great from this angle!

[oldsandman]

How did the porting look in person? The pictures make it hard to see it all. Intake side looks nice though.

[chad502ex]

Originally posted by oldsandman
How did the porting look in person? The pictures make it hard to see it all. Intake side looks nice though.

I thought the port/flow work looked really good. valve grind and lap not really sure on friends 550 head. I'll see mine tues.

[chad502ex]

more to come,...