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Rpms jump around
- VegasRob
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- 81 Kz750
The issue is that my rpms will not remain consistant. The bike will start up without any problem. I have the idle set at around 1800. After a few minutes the idle will drop to about 1k or shoot up to 4k completely randomly. Blipping the throttle usually brings the rpms back to 1800. I recently took the bike for a short first ride down my street, (my first time on a bike) and I'm just keeping it easy in first gear just to feel out the clutch, when the rpms start to run up without any throttle input. I'm new but I'm pretty sure something isn't right.
A little info on my bike, it is a 1981 kz750e 4cyl. It isn't a stock setup. It has the air box removed and the keihin carbs are set for pod filters. Idle jet has been bumped up a size. It currently has a fuel leak at the tee inlet. I have a new one on order but j b weld is helping that out until the part arrives. I also found out while working on my spark issue that my bike has a points style ignition out of a 68. Also the carbs were just cleaned, everything appears to be in good working order except for the rpm problem.
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- SWest
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- 10 22 2014
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- VegasRob
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Will a Crack in the carborators mounting boots cause a problem like the one I'm dealing with? I didn't notice any cracks but I might need to make a closer inspection.
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- SWest
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- VegasRob
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I forgot to mention that all of the vacuum lines are removed and the ports are plugged, the breathers on the forward valve cover have the hoses removed with small air filters installed. I don't know if that makes any difference. The fuel tank has just a simple on/off petcock with gravity feed to the carbs. No vacuum operation.
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- SWest
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- 10 22 2014
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- VegasRob
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- SWest
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- 10 22 2014
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- Mean Green Z28
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Yeah it was routed back into the airbox through a vacuum operated valve.VegasRob wrote: What does that do? I suspect it was part of some emissions or something.
Take some ether or braklean and spray around the carb/boot area while the bike is idling. You'll def hear the rpms rise if there's a leak. That's how I found that my throttle shafts seal was still leaking even after I replaced that he boots !
2010 Camaro 2SS
1983 Kawi KZ1000P ... bag of bolts
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- VegasRob
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- SWest
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- 10 22 2014
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Steve
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- VegasRob
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