KX Riders
Maintenance & Technical => KX500 Original => Topic started by: Kaw391 on June 11, 2013, 06:25:23 AM
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Been reading for a couple days trying to figure out all the differences in the engines over the years. Building a AF conversion with a 2006 KX 250F. What's the best carb to use if not the stocker?
I'm into this now as a full engine rebuild. I have the cases split now and ordering all new bearings. Gonna have the crank rebuilt and balanced. Cylinder has scoring so have to recoat it.
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39 pwk standard carb from 88on, depends on what kind of power you want
The 86 has a very small exhaust port{ good for low down power} if you are looking for topend power it would be a good idea to widen the exhaust port before you recoat it
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39 pwk standard carb from 88on, depends on what kind of power you want
The 86 has a very small exhaust port{ good for low down power} if you are looking for topend power it would be a good idea to widen the exhaust port before you recoat it
i use also the 86-engine in my ´93 kx500sf .. the ´86-standard-carb was the 40mm mikuni-roundslide .
88- 2004 came the keihin-pwk 39 and some guys updated the k5 with the pwk 41 for more topend power .
watch out before you go on to widening the exhaust port is one question, where will you ride the bike? for mx-tracks is this cylinder perfekt without any exhaust-mods. 8-)
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Sweet. So sounds like I should be set. Yes this will be mx, maybe an occasional GP and general play riding. I've got a new ktm 450 that I ride, so this will be a toy. I have used Eric Gorr on my son's Yz 144 and pw 50 so thinking the cylinder is headed to him as we'll. He also said he can put a decompression plug into the head.
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decompression valve is always a good mod for the 500cc engines. ...
in the main time i ride 250 but for practice and playriding i use 500 . i like this bear power.maybe i race it later the year. but on the most tracks here is this bike just to big..