valve sizes on the early '00 501 head?

Taffy · Jun 12, 2008

i have a '00 head here and the valves are tiny compared to later. looks like 32/27.

anyone know what the valve sizes were in the 501/600? trust it would fit?

what do we know about the std systems? i trust the 501/600 had bigger headers but all shared the rear section?

regards

Taffy

oyk · Jun 13, 2008

they are 35-30 taffy both 501 and 600.

yes headers in 600 are bigger but i can not recall how much.
but ports of course is the same.

the back section must be the same i think.

i have a brand new set of 501 fc headers that i want some time to test in my 600, what do you think will be the result of the smaller diameter in general?

oyk · Jun 13, 2008

501 and 600 also share the same cam.
my 1994 had a marked A camshaft which the smoother of all, something like the "55".

but when i changed to the 2000 complete cylinderhead i notice that even though A and "55" had the same lift and duration, the A had a profile more like a grape and the "55" more like a pear. meaning that the profile of A cam looked a lot smoother than the "55". where this helps exactly?

i now bought a "53" cam from a fc 400 to test in my 600, hope i dont explode my self..

Taffy · Jun 13, 2008

well i'd love to find a 501/600 head in that case! anyone know where there is one going?

do you think the 501 shares the 600s headers or the 400s?

smaller headers won't help anywhere i'm afraid. they could do with being bigger not smaller.

regards the cams well the pear shape should give really, really strong torque and pull from 5mph in 4th gear etc. the grape-shape produces less at VERY low and low revs but the same middle to top.

regards

Taffy

oyk · Jun 22, 2008

dyno tested my 1994 fe600 with the 53 cam finally, in the same diagramm i put also a
dyno of a stock fe501 2001 model in hi mode.
note that in that dyno a standard xr650r puts out no more than 41 hp.

[/img]

oyk · Jun 22, 2008

also here the air/fuel diagram, any comments on the jetting are welcome
the carb is fcr39

[/img]

cafey18 · Jun 24, 2008

Hi oyk,
Have a look in my gallery and check out the dyno charts I have posted. These are on my 06 Fe 650e standard and then with the standard muffler modified and corrected jetting. To compare the Dynojet and the Dyno Dynamics figures you will have to multiply the Dyno Dynamics HP figure by approx 1.3. This equates to approx 59hp on a Dynojet. Notice how much work we did do get a nice safe linear air/fuel ratio across the rev range. Perfect for trail riding at any altitude and any temperature. The power delivery is very smooth.
Cheers

Garry

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