Kvf 400
#1
02-16-2009, 10:09 PM
Join Date: Nov 2008
Posts: 4
Likes: 0
Received 0 Likes
on
0 Posts
Kvf 400
hey there just looking for some help.
i have 2000 kvf 400 4x4. only 450 miles on it. i melted the rings on the piston due to running to hot.
I always had to run it with the choke on. i replaced the piston rings and wrist pin.
put it back together, belive i timed it properly. but it is still running hot. i hit the gas and it back fires, and the idle screw is set at spec but it still idles high even without the choke on. i dont want to replace the piston again so any ideas will help alot.
thanks suzu
i have 2000 kvf 400 4x4. only 450 miles on it. i melted the rings on the piston due to running to hot.
I always had to run it with the choke on. i replaced the piston rings and wrist pin.
put it back together, belive i timed it properly. but it is still running hot. i hit the gas and it back fires, and the idle screw is set at spec but it still idles high even without the choke on. i dont want to replace the piston again so any ideas will help alot.
thanks suzu
#3
02-18-2009, 07:11 PM
Extreme Pro Rider
GOT BOOST!
GOT BOOST!
Join Date: Jan 2004
Posts: 3,204
Likes: 0
Received 0 Likes
on
0 Posts
Kvf 400
<div class="FTQUOTE"><begin quote> i melted the rings on the piston due to running to hot. I always had to run it with the choke on. i replaced the piston rings and wrist pin.
put it back together, belive i timed it properly. but it is still running hot. i hit the gas and it back fires, and the idle screw is set at spec but it still idles high even without the choke on. i dont want to replace the piston again so any ideas will help alot. </end quote></div>
Melting rings on the piston indicates running lean on the main jet.
Back fireing when you hit the gas indicates lean on the main jet.
If your idle screw is set to spec and the engine still idles high that means you have an air leak somewhere which can cause a lean condition.
Solution: Look for an air leak with something like WD-40. Spray it around the carb and intake boot with the engine running. When you hit the air leak the engine will rev.
Also; jet the thing up................WAY UP..........if you don't find the air leak.
put it back together, belive i timed it properly. but it is still running hot. i hit the gas and it back fires, and the idle screw is set at spec but it still idles high even without the choke on. i dont want to replace the piston again so any ideas will help alot. </end quote></div>
Melting rings on the piston indicates running lean on the main jet.
Back fireing when you hit the gas indicates lean on the main jet.
If your idle screw is set to spec and the engine still idles high that means you have an air leak somewhere which can cause a lean condition.
Solution: Look for an air leak with something like WD-40. Spray it around the carb and intake boot with the engine running. When you hit the air leak the engine will rev.
Also; jet the thing up................WAY UP..........if you don't find the air leak.
