Post by chcknugget on Sept 25, 2005 1:48:46 GMT
You are on the right track, here are my six points to ponder...
1) You can't just take that pipe out of the airbox and call it a derestriction. Every change to the air intake needs a new plug chop and new fuel mixture. This requires changing the main jet or upping the needle movement.
2) Ideally you want the least air restriction possible, so it is best to get a high performance filter. You also have to change the fuel mixture if you go this route, but you will have more power. If you are willing to go through the trouble of taking the tube out of the airbox and modifying the carb to account for the increase in airflow, you might as well get a real performance air filter, since you need to modify the carb anyway. Remember: ALL air intake modifications require a new mixture!
3) Running lean (too much air in the mixture) is really bad for these single piston scooters! It will burn the piston and cause it to seize. Please do not free up the intake and cause this by increasing the airflow! It is better to run rich (too much fuel in the mixture) because your piston won't melt (the gas actually cools and lubricates the piston) BUT you're scooter won't be running at peak power or effeciency.
4) The best way to increase the amount of fuel flow in the carb is to put new main jets in the float bowl. I have not found a source of new non-stock main jets. You can drill a hole in your stock main jet, BUT you have to be careful because you only get one shot! Remember, the difference between a #78 jet and a #81 jet is .03 of a MILLIMETER, and that small difference can change a lot in the way your scooter runs! Too big of a hole (by hundredths of a millimeter) will make your scooter run like poo, but believe me, it's better than running lean, your piston will scorch and sieze and to the chamber!!
5) I've increased the amount of fuel in mixture by moving the clip down on the pin so the pin rides higher. You can also put a washer under the pin clip to create the same effect (this is what I did, because it's easier than removing the clip).
6) MOST IMPORTANTLY, the screw on the side of the carb does NOTHING to the fuel mixture while you are using the throttle! It ONLY effects the air/fuel mixture at idle! Do not believe that it is the same thing as increasing the jet size or moving the clip. NO matter what you believe, it will not effect the speed or the performance of your scooter at all!
1) You can't just take that pipe out of the airbox and call it a derestriction. Every change to the air intake needs a new plug chop and new fuel mixture. This requires changing the main jet or upping the needle movement.
2) Ideally you want the least air restriction possible, so it is best to get a high performance filter. You also have to change the fuel mixture if you go this route, but you will have more power. If you are willing to go through the trouble of taking the tube out of the airbox and modifying the carb to account for the increase in airflow, you might as well get a real performance air filter, since you need to modify the carb anyway. Remember: ALL air intake modifications require a new mixture!
3) Running lean (too much air in the mixture) is really bad for these single piston scooters! It will burn the piston and cause it to seize. Please do not free up the intake and cause this by increasing the airflow! It is better to run rich (too much fuel in the mixture) because your piston won't melt (the gas actually cools and lubricates the piston) BUT you're scooter won't be running at peak power or effeciency.
4) The best way to increase the amount of fuel flow in the carb is to put new main jets in the float bowl. I have not found a source of new non-stock main jets. You can drill a hole in your stock main jet, BUT you have to be careful because you only get one shot! Remember, the difference between a #78 jet and a #81 jet is .03 of a MILLIMETER, and that small difference can change a lot in the way your scooter runs! Too big of a hole (by hundredths of a millimeter) will make your scooter run like poo, but believe me, it's better than running lean, your piston will scorch and sieze and to the chamber!!
5) I've increased the amount of fuel in mixture by moving the clip down on the pin so the pin rides higher. You can also put a washer under the pin clip to create the same effect (this is what I did, because it's easier than removing the clip).
6) MOST IMPORTANTLY, the screw on the side of the carb does NOTHING to the fuel mixture while you are using the throttle! It ONLY effects the air/fuel mixture at idle! Do not believe that it is the same thing as increasing the jet size or moving the clip. NO matter what you believe, it will not effect the speed or the performance of your scooter at all!