Post by humanshield on May 9, 2015 15:49:34 GMT -5
Brent and I have discussed this before and he's mentioned long ago....so I'm dealing with it again now and wonder what others may have done to correct this. Here's the issue....
QMB139 definitely runs better without the air intake snorkel. No doubt.
BUT......when it's removed (most noticeably in windy conditions) there is a constant "surging" and it's definitely due to changing air pressures at the intake box inlet.
In calm conditions with no wind, there is no surging and all is great. But with almost any wind, I get this constant surging or power (or more precisely, LOSS of power).
Sometimes it's really annoying. The scooter will drop back from say 40 to 35 or 33....depending on the winds, then pick up again, then slow down again then pick up again...then slow down again.... This constant struggle really takes away from the riding pleasure.
It is NOT wind resistance.
How do I know? Easy. If I place my left foot directly in front of the small inlet hole in the front of the airbox (about an inch to two inches away), the surging completely stops in spite of how bad the wind is blowing.
The simple solution seems to be adding a wind deflector plate just ahead of the inlet hole. So it seems the whole problem is from an increase in pressure at the inlet causing a lean condition more so than a low pressure causing a rich condition. Lean is bad.
So has anyone else dealt with this and what was your solution?
Ideally, I think a nice black, plastic, bullet shaped cover, open at the back, about 3 inches long and 2 to 3 inches in diameter with a clamp that would securely clamp onto the existing protrusion where the original air snork went "should" solve this problem.
What do you think? And where can I find a plastic, bullet shaped item like this? Preferably black. I can fabricate a lightweight steel clamp and pop rivet it to the thing....if I could find a suitable "hallow bullet"
QMB139 definitely runs better without the air intake snorkel. No doubt.
BUT......when it's removed (most noticeably in windy conditions) there is a constant "surging" and it's definitely due to changing air pressures at the intake box inlet.
In calm conditions with no wind, there is no surging and all is great. But with almost any wind, I get this constant surging or power (or more precisely, LOSS of power).
Sometimes it's really annoying. The scooter will drop back from say 40 to 35 or 33....depending on the winds, then pick up again, then slow down again then pick up again...then slow down again.... This constant struggle really takes away from the riding pleasure.
It is NOT wind resistance.
How do I know? Easy. If I place my left foot directly in front of the small inlet hole in the front of the airbox (about an inch to two inches away), the surging completely stops in spite of how bad the wind is blowing.
The simple solution seems to be adding a wind deflector plate just ahead of the inlet hole. So it seems the whole problem is from an increase in pressure at the inlet causing a lean condition more so than a low pressure causing a rich condition. Lean is bad.
So has anyone else dealt with this and what was your solution?
Ideally, I think a nice black, plastic, bullet shaped cover, open at the back, about 3 inches long and 2 to 3 inches in diameter with a clamp that would securely clamp onto the existing protrusion where the original air snork went "should" solve this problem.
What do you think? And where can I find a plastic, bullet shaped item like this? Preferably black. I can fabricate a lightweight steel clamp and pop rivet it to the thing....if I could find a suitable "hallow bullet"
