Yea, this.Whenever you add a reed valve you need to jet the carb real BIG & then carefully test smaller jets until the 'sputtery' feeling goes away, (& then stop)!!!
Jetting any smaller will feel like there's more power but it's actually getting close the 'too lean' territory that burns pistons!
I can't say anything bad about the stock carb, it idles perfectly and throttle response, I couldn't ask for more from this chins motor. Wondering if I lengthened the runner from the reed valve to the carb, would that give me the low end torque I'm looking for?
Nail on head.its torquey, because it makes no horsepower.
Outerwears silicon impregnated screen will keep water out of your filter.Yea I hear yah on the water.
And I have seen tests that show there aren't really any filters that work great a preventing water transmission, without hurting performance.
Seems like it is just an unfortunate fact of life... another benefit of the air-box style set-up, and hiding the inlet somewhere out of the air-stream + fenders to keep water from spraying all over the bike.
Outerwears silicon impregnated screen will keep water out of your filter.
I'm not using it on the MB yet but they work ok on the KTM.
These motors are so easy to experiment with.
Last winter, before I bought my new camera, I tried various "airbox" shapes:
The long "trumpet" at top was a torque monster but no speed.
This was the best one.
Some JB Weld and a waterbottle on a jar lid, too easy.
Test them on a hill with a GPS as a speedo.
Cutting the bottle at an angle broadened the power spread and is easily angled to miss the mud spray off the tire.
Cuz we can't be afraid of a little rain can we?
I had a problem with the stock filter letting dust through, damaging the cylinder.
This finer foam is working fine. You are right about getting the carb as close to the piston for signal too.
I'll probably mount the carb closer yet later. Extending the bottle "airbox" gave worse performance.
I need more shortness!
This looks like you bought the wrong piston for your bike. There’s some that have the long rod and some the short. You have to get a high or low hole piston and it looks like it jammed into the spark plug and broke a hole. That’s what it looks like from the picturesHere's pics of experiment gone bad