I have sean many 4 strokes guys use hard back K&N's- work great. Not so much on a reed valve 2 stroke- why?
Push back [resonance] Reeds are designed to push back the wave form of the crack case [to some extent].
Think of it as (+) and (-) waves. Piston goes down = + pressure to the carb. out see and feel spit back out of carb.
Piston goes up (-) wave- pressure sucks fuel from carb into crankcase.
Up& down it goes until it hits a (RPM) frequency that all is good harmonized or equal. Flows to it's optimum in & out.
Spit back: happens even with reed valves at RPM's so there must be a wave that does that, Right.
If that wave hits a hard surface and reflect back into the intake and disrupts the flow, we call that a stumble.
Simply changing from hard back to soft- foam will remove that stumble - jetting maybe required. Due to flow increase.
Please comment on this subject if your results very.
JT
(rdsonly) dead
Push back [resonance] Reeds are designed to push back the wave form of the crack case [to some extent].
Think of it as (+) and (-) waves. Piston goes down = + pressure to the carb. out see and feel spit back out of carb.
Piston goes up (-) wave- pressure sucks fuel from carb into crankcase.
Up& down it goes until it hits a (RPM) frequency that all is good harmonized or equal. Flows to it's optimum in & out.
Spit back: happens even with reed valves at RPM's so there must be a wave that does that, Right.
If that wave hits a hard surface and reflect back into the intake and disrupts the flow, we call that a stumble.
Simply changing from hard back to soft- foam will remove that stumble - jetting maybe required. Due to flow increase.
Please comment on this subject if your results very.
JT
(rdsonly) dead