Maintenance & Technical > KX500 Original
float height question
slow600:
adjusted my float height last night, apparantly i didnt do it right cause now it runs out of the overflow at all times. it did not do this before i messed with it. can someone show me in the jetting section on how to do it correctly. i looked for it but 52 pages is a lot to read through.
what i was trying to do was keep the fuel from running out when jump or go over bumps, and possibly attempt to make the bike run leaner. i thought that meant i should lower the float height, is this correct or backwards? i read somewhere on here that an easier way to set the float than measuring was to set the seam on the float parallel to the gasket surface. is this accurate? thanks
crazyolbastard:
I have a exrta carb so I used my extra bowl drain/plug- drilled a hole in it the same size as a fuel hose,
put a 10 in piece of hose in it.
I use this so I can see how high the fuel level is.
The fuel level should be the same as the gasket-
Hold the line higher than needed so fuel don`t run all over the place.
I know this is no help if you have no extra draig but it is the best way to set your float.
Take a lil time and read some of the posts here.
These guys are good at explaining how to do stuff like this.
flyingfitz:
I just went through this. Here is what I did.
My bike was going through an obscene amount of fuel while woods riding. There is no way it could have burned that much fuel so I thought there is something to this overflow/float height thing. I read the whole thread on jetting, researched the special float height tool, called sudco to find out how much bowl plugs cost and researched the Keihin method of setting the float height. After all this research I decided to go with KXCams "blow through the tubing method."
When I talked to sudco they said the most overlooked and most important part of the carb is the float needle. It is not cheap. I paid $18. He is sudco, he knows more than me so I went with it along with a handful of pilot jets. Your overflow problem may be related to a wore out float needle.
The float height is supposed to be 16mm +-1 from the gasket surface to the part of the float farthest from the gasket surface. After reading KXCams contribution to the jetting thread I decided to set the float 1mm below the suggested range ie. 18mm.
I put fuel line onto the carb fuel inlet port. While holding the carb upright, I blew through the fuel line as I slowly raised the float until the float needle engaged the seat which cut off the air I was blowing in the fuel line. At the point where the air stopped, I held the float steady against the center guts of the carb and measured the float height with a caliper. I repeated this with the carb in various attitudes to make sure my method was consistent. I tweaked the tab until my distance was a solid 18mm and called it good.
I went out riding tonight and went through much less fuel. It still goes through more fuel than what I think it should for woods riding. I am still rich on the pilot. I am hopeful that getting the pilot right will further enhance the range. If not, I may go another mm on the float height??
Hope this helps.
Fitz
Friar-Tuck:
I can't seem to get this to pop up full size, Click on it to enlarge! :-D
The first link is kinda old however you get the idea, :|
http://www.salocal.com/sohc/tech/carb/asmpg_mgs/flthgt.htm
http://justkdx.dirtrider.net/floatlevel.html
hughes:
Try this link.
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