my 50cc aprillia scooter is 3yrs old. starts straight away.once its warmed up and you give it a fist full of throttle it just bogs out.let the twistgrip go and its resums tickover as normal.twist the throttle slowly going up through the revs and as you are about to achieve max revs it just bogs out until you let the twistgrip go and then the engine will cut back in again.could it be restricted !
is this the tale tale sign of a restricted bike!
any help would be apreciated
stan

stan white, October 2009

its running weak !which means there is a fuel shortage for some reason whcih is why when you open the throttle and give it lots of air to burn its dies as it want more fuel too.i would check the carb jets and clean them out and alos make sure there is no water in the fuel as this will cause that too,try taking the lide out of the carb and moving the small circlip on the needle to the lowest notch(one nearest the pointed end)it will lift out of the needle jet earlier and further too.adam trained motorcycle mech.20 years in the trade.

adam bike doctor, October 2009

could be blockage in carb main jet.

rayb, October 2009