Maintenance & Technical > KX500 Steel Frame Conversion (SFC)

my 03 kx 250/500 build

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doorslammer:
cheers guys, going to ring around and see if i can find a busted kx5 pipe someone is willing to cut the front section off.

anyway, about to order some parts (piston, gaskets etc) but i need a set of reeds as well. just wondering if someone could identify this reed block. it has a boysen sticker on it.

is it worth it? would it be better to just get a v force or standard cage with C/F reeds?

i like the angle on it, seems to match the 250 well, hopefully it will make carby/airbox alignment easier.


cheers Guys.

ill be getting into the serious stuff soon haha

Marco810:
Have a look through Motorrad's engine build thread, im sure you'll find the answer in there

don46:
That is in fact a Boysen RAD valve, I have not used the Rad valve, I ave V-force on mine, but Boysen makes good stuff so I'm sure its good.

The Flyin Hawaiian:
A problem that I see with using the Rad Valve, Im assuming that it is from the 500 engine that was in a standard 500 frame, will be that the carb will go into the shock. I tried a 04 KX250 intake with a 250 V Force 2 cage. It was still close to the shock and a bit too short. I was always afraid that the carb would pull out of the airboot. I ended up sucking a reed with the V Force 2 also and it wouldnt run right anyway. I ended up going back to the 500 reed cage with a set of Boyesen reeds and a 91-94 KDX250 intake. The KDX250 shares the same reed cage and reeds with the 500 and the intake was angled better, more clearance for the shock, and is a little longer so the carb sits in the airboot much better.

doorslammer:
Well hit a bit of a snag, ended up fracturing both my left and right Foot, and have now got a plate in the right. After spending a month in hospital I'm finally home but still not walking...

Anyway back to the bike, those who are using cr500 pipes what muffler do you use, can I use either a cr500 or kx500 muffler. Also can I cut the front section off the 250 pipe to adapt to a cr pipe or is it too small?

Cheers

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