*** NEED HELP BAAAADLY***
#1
*** NEED HELP BAAAADLY***
Here is the problem, My buddy's 1/8 scale runs good for 2 min and then just richens up so bad the car wont even move. If the car is held up in the air and you pull throttle smooth it works fine if you hammer the throttle it richens up & bogs down. We have changed everything that we can think of, here is what we have changed.
-2 different motors Motors
-Carburetors
-changed fuel lines many times
-different fuel line lengths
-used pressure chamber
-fuel tank
-clutch components
-clutch rebuilt multiple times by different People
-2 different motors Motors
-Carburetors
-changed fuel lines many times
-different fuel line lengths
-used pressure chamber
-fuel tank
-clutch components
-clutch rebuilt multiple times by different People
#2
make sure the o rings on the high and low speed needles are fresh...if there easy to turn they tend to vibrate loose=rich
#3
It's doing this with two different motors? That's weird. What motors?
About the only things you haven't changed are pipes and fuel.
About the only things you haven't changed are pipes and fuel.
#4
Also, if this is a Mugen that's a common problem. Lean it out a bit and tune it on a half tank. If it's then too lean on a full tank, richen the bottom, tighten the clutch, increase clutch gap.
#7
Tech Elite
iTrader: (16)
Sal,
I saw something like this once with a pipe that had a partially blocked pressure fittinig on it... the guy used JB weld on the threads to keep it from ever coming loose, but some got into the fitting and had it almost sealed off... we'd start the engine, tune it, then after a minute or two of running the pressure slowly built up and kiiled richened the mixture. Try blowing thru a pice of fuel line attached to the pressure fitting and see if its clear...
Another thing to check is the fuel tank cap... if the spring doesn't close and seal it on its own, it can leak pressure, but as the car runs, the engine vibration can eventually let the spring shut it, and then the seal finally lets the pressure build up and you're rich...
Gonna be at Floyd Sunday?
I saw something like this once with a pipe that had a partially blocked pressure fittinig on it... the guy used JB weld on the threads to keep it from ever coming loose, but some got into the fitting and had it almost sealed off... we'd start the engine, tune it, then after a minute or two of running the pressure slowly built up and kiiled richened the mixture. Try blowing thru a pice of fuel line attached to the pressure fitting and see if its clear...
Another thing to check is the fuel tank cap... if the spring doesn't close and seal it on its own, it can leak pressure, but as the car runs, the engine vibration can eventually let the spring shut it, and then the seal finally lets the pressure build up and you're rich...
Gonna be at Floyd Sunday?
#8
Tech Elite
iTrader: (12)
You changed engines and everything else except the pipe. I had a pipe that was brand new and none of my engines would run with that pipe. I cut it open and found that the baffle inside had only one hole in it, the rest were never punched out. Your problem may just be a bad pipe.
#12
Tech Rookie
?
Does anyone know of a track i can race my cen nitro car near stevens point, wi. or a link for track locations? Thanx.