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Idles normal with hand over carb and gets to much air with hand off

Its a 1983 honda aero80 it idles right with hand over carb but when hand off it gets to much air and the throtles not responden and i not on list so im jus picking one

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You have a major air leak on the carb intake, cylinder, head or seals. Tighten down the head to start with. Tighten down the carb and the manifold it is bolted to. If that doesn't fix it, as old as the bike is, I would find a gasket set with crank seals and then replace the crank seals. When replacing seals tighten the center case screws. Then I would move on to replace intake manifold gaskets and head/ cylinder gaskets.

Check the crank bearings. Hold the flywheel in your hand. Lift it up and down then move it left and right. Any movement or is it rock solid? If movement then you will need to take the engine apart and install new crank bearings.

While you are checking things, pull the cylinder head and de-carbon the head and cylinder. Run the piston down and check the exhaust port. Over the years carbon may have built up in the port and plugged it nearly closed. It should be about the size of the intake port. Remove the buildup to allow the engine to breathe.

Please rate this answer. Thanks!

Posted on Apr 20, 2009

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http://www.cycleterminal.com/Service-Manuals/Honda-VT500C-Shadow-Service-Manual-English.pdf
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Hi, I bought the Stunner CBF bike 4 years ago. It Hi, I bought the Stunner CBF bike 4 years ago. It was fine up to 40,000 kms. And after 40,000 kms its starts to smoking. So i replaced the ring and piston with original parts but it didn't work well and still smoking and again the technician open the bike and they said that it is the piston problem and they said that it should be replaced but not with the original parts and they replaced the ring and piston with 50mm size of Mahal brand. I have replaced all the parts like ring, piston, valve and other supporting parts but still my bike smoking when i accelerate above 60km/h. When i ride bikes in hilly areas with my friends behind then pick up is very less and its bikes smokes blue. My silencer gets wet and when the bike cool down then the silencer gets dry. When i check the engine oil it is fine up to mark of the leveler. So i am confuse what is the problem. For 8 to 10 times i used Sarvo, Enoc and Zic engine oil. Now i am using Honda engine oil in a gray bottle pack. The technician said that the parts of honda is not good enough as before. These are all made in china so that the problem occurs. So that they replace the Mahal brand ring and piston. Now my bikes traveled nearly 50,000 kms (49,800 kms). And one thing i didn't give my bike to the showroom for the replacement of ring and piston. I gave it to the reputed technician in town. I think this time i will get proper answer for my problem. Thanks

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