Question about 1990 Aprilia AF1 125 Sintesi

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Help my bike has no power over 5k revs fine in town low revs low speed but no power out of town and is stalling on hills

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Fuel filter stoped up or an obstruction inside of fuel shutoff valve

Posted on Nov 19, 2009

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1 Answer

No power


have the fuel pressure checked as it may be too low at accelerator opening. run fault codes to check for faulty MAP/MAF/VAF sensors.

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My bike has been to the shop twice 4 the same problem and its still there i have no power at low revs even in first gear to the point it stalls . but at high revs the bike goes hard can u help?


apart from the obvious check air filter is clean spark plug is good and your pilot jet in carb is all clear form dirt or gummed fuel my next step would be put a tooth or two bigger rear sprocket on it to lower the gear ratio this will give more torque low speed maybe whilst you looking at the sprocket just check that some has not change the front to smaller sprocket it being few years old some one may have set to get more top end speed and sacrificed all the low end??

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Bike has no power up to 7000 rpm


check your gear ratio ie chain and sprokets if thay are to high of a ratio this will happen . as these bikes dont start to make power untill thay rev up hight . thay are tuned for top end revs and speed

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You sould have recieved a "recall" notice in the mail about the cruise control for fire and failure issues. they are adding a fusable link where the cruise control harness connects to the brake master cylinder. if you have not had the recall performed yet you should SERIOUSLY consider getting it done, mainly so it doesnt catch fire, but "could" be the result of the failure you've been experiancing! btw, almost ALL Ford vehicles have been affected with the cruise control recall. hope this helps!

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It lugs around and for me at about 6k it felt like a powerband and my bike kicked me and took off like a bat out of hell (I love that analogy). Anyways it was my plugs. How many miles are on the bike? My bike only has 5k miles and the plugs were pretty fouled. Runs like a top now. It stated being sluggish down low, a week later it was worse and would almost stall on me. I changed the plugs the day it stalled on me and no more problems. Best $18 I ever spent on a bike, sadly it was to just get it to run right. Best of luck!

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