Maintenance & Technical > KX500 Aluminum Frame Conversion (AFC)
2017 KX250F - 2004 KX250
umberto:
After a long break, I am finally ready to tackle this project again. I have a buddy who is a machinist that is going to help me with getting the frame sections swapped out, and the motor mounts and head stay fabricated. He has a way of simplifying things that makes things go swiftly and easily. In preparation for taking the stuff back to my home town, I worked on getting the swingarm fitted to the engine. The swingarm did need some shaping at the front, but luckily the engine is narrower than the swingarm opening. This allows me to fine tune the chain alignment and fabricate the spacers as needed. There's not much to show, but here is the swingarm after I sanded it to fit.
I also had to purchase 2017 radiators to use, as the 2004 models just wouldn't fit the frame at all. I was able to score a set of stock radiator hoses with the y fittings to try to modify the hose routing to fit the KXF radiators. On a positive note, I was amazed at how well the CR cradle lines up with the KXF frame. It will really simplify things.
I think I have all the parts accumulated, now it's time to just do it.
umberto:
I had a quick radiator question to make sure I am routing the hoses correctly. It appears the two stroke radiators go in the bottom of the right radiator, cross over at the bottom to left radiator, and flow up to the top where the right radiator crosses over to the left radiator and the coolant flows out the hose to the cylinder head and down to the water pump again. It appears the four stroke is similar, it just splits the hose instead of using radiator cross overs. Is that correct, or does it flow the other direction?
SS109:
The waterpump pulls from the right radiator and pushes the coolant up through the engine. It exits the cylinder head and goes to the left radiator.
umberto:
Okay, I had it backwards then. Using the KXF radiators, I will plum the bottom tanks of both radiators to the water pump, and the top of both radiators will go from the top of the cylinder head to the top of both radiators. All I need to do now is find some y and t connectors to use to replace the stock ones that actually attach to the head and water pump. Anyone have any suggestions on where to find some? Here is the stock configuration:
sandblaster:
Cool... but if there are no pics, you know the rules... It never happened... :lol:
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