Setting Float Height on Carb
Posted: Fri Apr 01, 2005 1:03 am
Reading through many recent posts discussing over rich carb's, I see I'm in good company. My Cub has run rich since I bought it, despite mixture adjustment, hotter plugs, cleaned air cleaner, float seems dry, etc. I recently rebuilt the carb (IH kit) to no avail. It carboned up the plugs in less than an hour's operation. It also drips gas from the drip port on the carb (for lack of a better term)
The other day I followed Lurker Carl's procedure for setting the float height, but I haven't started it up to see if I did any good yet.
Here's my question.
Initial Condition:
Float Height = 1.34
Float Level = 1.57
Gas Level = 0.53
OK, gas level is on the low side (spec is 0.563-0.625) - so maybe cause of running rich - I'll try increasing float height
Adjusted Condition
Float height = 1.46
Float Level = 1.65
Gas Level = 0.75
Conclusion: Now the gas level is past the spec. I'm surprised it is that sensitive: I increased Float Height 1/8", resulting in a 1/4" decrease in gas level. Is it the experience of those who have done this procedure that it is that sensitive? Maybe I went too far, but I thought I'd try it like this first and see if it runs leaner and doesn't leak gas from the carb.
I'd appreciate any thoughts and experience. Thanks
Paul
The other day I followed Lurker Carl's procedure for setting the float height, but I haven't started it up to see if I did any good yet.
Here's my question.
Initial Condition:
Float Height = 1.34
Float Level = 1.57
Gas Level = 0.53
OK, gas level is on the low side (spec is 0.563-0.625) - so maybe cause of running rich - I'll try increasing float height
Adjusted Condition
Float height = 1.46
Float Level = 1.65
Gas Level = 0.75
Conclusion: Now the gas level is past the spec. I'm surprised it is that sensitive: I increased Float Height 1/8", resulting in a 1/4" decrease in gas level. Is it the experience of those who have done this procedure that it is that sensitive? Maybe I went too far, but I thought I'd try it like this first and see if it runs leaner and doesn't leak gas from the carb.
I'd appreciate any thoughts and experience. Thanks
Paul