|
|
Post by acesarp on Feb 17, 2018 23:59:38 GMT -5
I have recently noticed a considerable loss of power on my scooter, it's only got 6500km on it.
Does any one have any ideas?
Cheers!!
|
|
|
|
Post by greginisn on Feb 18, 2018 1:46:25 GMT -5
I'm thinking that's an FI engine so not too much you can do there. So how about something wrong in the CVT. Your variator is messed up, Your drive belt is badly worn, your clutch is greasy or torque drive spring has gone bad. Brakes dragging? What do you know to be good with the scooter?
|
|
|
|
Post by 90GTVert on Feb 18, 2018 7:42:35 GMT -5
Any other symptoms? (Low or high RPM, hard starts, noises... anything at all that feels different)
|
|
|
|
Post by GrumpyUnk on Feb 21, 2018 16:09:06 GMT -5
Certainly checking the fuel flow would quickly eliminate one source of problems. Limited flow will limit the power the engine can produce, and thus speed. The gravity flow should be the full inner diameter of the fuel line, with suction applied to the diaphragm of the petcock valve if vacuum operated. If the flow is slow or a trickle, check the filter, the fuel line for inner decomposition, or the outlet from the tank. Most have a 'stack' of screen in the shape of a tube to do some filtering before the fuel leaves the tank. It can plug also.
tom
|
|
|
|
Post by greginisn on Feb 21, 2018 22:57:35 GMT -5
At least some Zumas have a low mounted fuel tank and so actually use a fuel pump beside the injector pump. There could be a problem with restricted fuel delivery. How to check that, I don't know.
Greg
|
|
|
|
Post by GrumpyUnk on Feb 22, 2018 14:18:30 GMT -5
If there is a pump installed due to low fuel tank mounting, such as under the 'floor', a method to test would be to make up a temporary fuel tank and install it under the seat, or behind, and allow gravity feed. If the gravity feed improves operating, you can take the time to check the pump close. Applying suction to the diaphragm connector(manifold fitting), and releasing the suction should cycle the diaphragm and push fuel from the tank towards the float bowl.k A low budget replacement might be to use a common garden tractor or riding mower fuel pump. They are operated by the pulsation of pressure in the oil sump created by the piston moving back and forth. As the piston goes towards TDC, the volume inside the sump increases, and the opposite as the piston goes towards the bottom of the stroke. The pulsations are applied to a diaphragm, which pulses back and forth thereby pumping the fuel. They are cheap... and reliable.
tom
|
|
