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Old 09-21-2007   #1 (permalink)
dxiw
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Join Date: Sep 2007
Posts: 10
Default KZ550 overrev.. loss of power now.. please help

To summarize what happened:

I was riding my 82 kz550 down to work (as I do everyday) with no problems. I was quickly accelerating from a stop and at around 7000 rpm in first gear, I made my usual shift into second. I somehow miss the shift and end up in neutral (I know what a retarded mistake..) and the engine revs for a couple seconds to the highest the tach will read (12000+ rpms on a 9500 redline) in which I immediately let off the gas.

When I started to ride again the bike seemed like it lost all of its power. I rode it two miles home in this condition. It seems like it has no torque. It revs up very slowly (even with a ton of throttle) and then once it hits like 4000-5000 rpm then it kicks in power in a choppy way. In 2nd or 3rd gear, it doesn't have enough power to accelerate much at all unless I nearly give it full throttle. It literally takes me 30 seconds to get up to like 30 mph. I notice in first gear if I give it a lot of gas, it will rev up very slowly from idle to 5000 or so, and then all of a sudden a ton of power kicks in and it throws me in a wheelie.

Any advice?

The two things I was thinking were:
1. The carburetor's throttle slide is stuck, so it can't create vaccuum at low rpms.

2. The valves in the engine got ****ed and so only one or two cylinders are giving power at low rpms. But then as it revs up, at high rpm, the valves start to function correctly and all of the cylinders kick in.

I would def appreciate any help.. thanks
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