I disagree with their theories, here's why
-04/05 intake cam 300 degrees duration w/.358 inch lift
-08/09 intake cam 292 degrees duration w/.382 inch lift
The duration is the usable power range, how long the valve stayes open.
If you visit any cam web site, you will see more lift in comparison to duration. many engines are built with less oversquare, unlike the kawi's (more bore, less stroke)
If you use the 08 cam in your bike you will gain more power sooner, while the 04 can will give you less power where you need it (mid to high), but will prolong the pwr it provides a little longer.
Now here is the issue, look at the lobe centers of the cam set up (04/05 zx10 104/102); 08/09 zx10 111/102). The 04 gives you more low to mid power in comparison to the 08.. you have less hp/tq down low, but it out performs the 04 on the big end.
So, where will you put your power? Ihave owned two 04's, one 05 an 07 & 08... I currently own the 07 and 08. The 08 runs two tenths faster, both bikes (04 and 08) have .017 thinner head gaskets and were on Mr9. I had to run more gearing on the 08 because of the lack of mid hp/tq and the both bikes run nearly same mph (148)
Suggestion:
-use the .45mm thin head gasket
-use the 08/09 zx10 stock intake cam(49118-0116) or 08/09 race cam (49118-0134)
-depending on your weight, I suggest keeping the number a lil higher 107/107; Kawi recommends for the 08/09 In/ex 110/102
Reason:
the 04/05 exhaust profile numbers are the same as the recommend 08/09 race exhaust cam (49118-0045)
-I can't exactly tell you what the numbers will be; if I had to gestimate, I think this will give you another 5 to 7 hp
Note: the 04/05 exhaust cam can not be used in the 06/07 or the 08-10 models (reason) you bike will not start because of the cam timing mark is read by the ECU.
Tell me how it works... if possible do before and after dyno runs..
Hopes this helps
JTR Inc