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Originally posted by Lucky Luke
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If your bike is still stock, that should not happen.
Check the following (two persons needed):
You will see that there is a small pipe connected on the top of the intake manifold right after the carb and it's isolating rubber.
There are also two hoses, one connected to the airbox, and one to the rocker cover. This last one actually continues inside and opens by a small hole in the exhaust port, in the cylinder head, right after the exhaust valve. These two hoses and this little pipe are all connected to a valve system situated under the tank.
1- Un plug the small pipe and the hose from the airbox.
2- while one gently tries to blow through the hose from the airbox, another one aspirates from the small pipe near the carb. This should open the valve and allow to blow in the "air-box" hose .
This system is designed so that, when you throttle down, meaning the high revving is still aspirating gas (the depression system of the carb is not fully closed yet - but the butterfly is, blocking air). The mixture is then too rich, but the depression in the manifold opens the valve, allowing fresh air to get right after the super-hot exhaust valve and finish consuming the extra gas of the too rich mixture.
If this does not work, a large quantity of unburnt mixture will get in the exhaust, and an occasional spark (a tiny particle of red hot carbon, or a flame from the exhaust) will ignite it, causing the loud popping sound and the exhaust flames. Very common when decelerating, going downhill etc....
Mind it: some pay money for having this sound and these flames bursting out of their exhaust: looks great in the night in front of mates and girl friends!
Check the following (two persons needed):
You will see that there is a small pipe connected on the top of the intake manifold right after the carb and it's isolating rubber.
There are also two hoses, one connected to the airbox, and one to the rocker cover. This last one actually continues inside and opens by a small hole in the exhaust port, in the cylinder head, right after the exhaust valve. These two hoses and this little pipe are all connected to a valve system situated under the tank.
1- Un plug the small pipe and the hose from the airbox.
2- while one gently tries to blow through the hose from the airbox, another one aspirates from the small pipe near the carb. This should open the valve and allow to blow in the "air-box" hose .
This system is designed so that, when you throttle down, meaning the high revving is still aspirating gas (the depression system of the carb is not fully closed yet - but the butterfly is, blocking air). The mixture is then too rich, but the depression in the manifold opens the valve, allowing fresh air to get right after the super-hot exhaust valve and finish consuming the extra gas of the too rich mixture.
If this does not work, a large quantity of unburnt mixture will get in the exhaust, and an occasional spark (a tiny particle of red hot carbon, or a flame from the exhaust) will ignite it, causing the loud popping sound and the exhaust flames. Very common when decelerating, going downhill etc....
Mind it: some pay money for having this sound and these flames bursting out of their exhaust: looks great in the night in front of mates and girl friends!
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... Anyways, hopefully by Monday I shall get my FFE back and after refilling Glasswool.. She would thank me and rev to glory..
Looks pretty clear cut to me.
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