help
- Thread starter briggy
- Start date
- Status
Russ2251
AZUSA:Powered by LAWN-BOY
Choke should be fully opened when warmed up. No exceptions.
Should not...unless it is in need of cleaning.
by placing an airfilter on a carb, the suction from the motor is confined to trapped air. it has to pull harder to get the same air as no filter. therefore you get velocity instead of flow. velocity will pull more fuel from the carb, and increase idle speed. the flow of the filter will dictate how much the idle will raise. on big engines, you have to reset your mix once you install the filter.
no, the throttle is fine..what is jet??
the jets are what measures the fuel to air. so much fuel to air over a given amount of time or pulse. try your mix screw or adjustable jet first. softly tunr in all the way, back it out 1 and a half full turns. crank it up and see how she runs. if she is bogging, turn out; if trying to die, turn in.
Russ2251
AZUSA:Powered by LAWN-BOY
Air filter should appear invisible to engine...should be no difference between on or off the system. If there is a difference, then filter is wrong or is in some other way compromised.
Kaptain Krunch
Pro Junk Collector
Now matter what your not going to get zero resistance with an air filter, with a stock air box it will be slightly restrictive. When i moved from a stock airbox to Uni pod filters on my bike engine it ran a little lean.
Russ2251
AZUSA:Powered by LAWN-BOY
Engine air filters are designed to separate particulate matter from the air, not gasses[FONT=tahoma, arial, helvetica][SIZE=-1] (such as [/SIZE][/FONT][FONT=tahoma, arial, helvetica][SIZE=-1]N₂ [/SIZE][/FONT][FONT=tahoma, arial, helvetica][SIZE=-1]or [/SIZE][/FONT][FONT=tahoma, arial, helvetica][SIZE=-1]O₂[/SIZE][/FONT][FONT=tahoma, arial, helvetica][SIZE=-1]). [/SIZE][/FONT]
If they were designed to filter gasses, I would wholeheartedly agree with everyone.
Try breathing through an air filter and then through a gas mask.
Breathing through a gas mask takes an obvious effort. An air filter takes zero effort until it begins to lose it's porosity or is too small (low cfm rating) to begin with. I purposefully use the smaller filters for aesthetic reasons with no difference in performance. Proved out with a stroboscope at various RPM, load or no.
Holds true for 2 or 4 cycle.
If they were designed to filter gasses, I would wholeheartedly agree with everyone.
Try breathing through an air filter and then through a gas mask.
Breathing through a gas mask takes an obvious effort. An air filter takes zero effort until it begins to lose it's porosity or is too small (low cfm rating) to begin with. I purposefully use the smaller filters for aesthetic reasons with no difference in performance. Proved out with a stroboscope at various RPM, load or no.
Holds true for 2 or 4 cycle.
though the resistance is negligible by most's standards, it is still there. try breathing under a heavy blanket. this is how a uni acts. now try breathing under a light thermal blanket. this is how k&n acts. granted an engine has greater 'lung power' than we do, so it is not as 'felt'. the larger airfilters are to allow more air to condensate inside while waiting for that next pull and reduce the pressures on the filter itself. the smaller ones are ran out on ducting to accomplish the same. see cold air intakes. yes the ducting is also to put the air intake into colder air.
what exactly do you have to clean??
Russ2251
AZUSA:Powered by LAWN-BOY
I'll leave it there.
Back to the original post...
A lean condition exists. All the descriptors are there, such as having to increase fuel supply (choking) to get it to run smooth.
Unmolested engines will lean out, over time, for various reasons.
I assume an emissions carb is the culprit.
Get a fully adjustable carb to compensate for various conditions, including engine wear.
Tolerances are very close on EPA compliant carbs and doesn't take much to upset them. A little varnish is enough to "F" things up.
If an adjustable unit cannot be in the mix...then the suggested rejetting is the next best thing.
Kenny_McCormic
Kartless....
Not always true, sometimes the airbox/filter can be very important for performance. Great example is a Honda Spree 50, it simply wont run right with anything besides an unmolested stock setup.
Russ2251
AZUSA:Powered by LAWN-BOY
There are always exceptions. Does not apply to briggy's prob.
Kenny_McCormic
Kartless....
No industrial motor is anywhere near as sensitive and temperamental as a microscopic Honda scooter engine.
- Status