High idle problem

[grant965]

Hi, after replacing all 4 inlet rubbers because old ones were cracked I am getting a 4k idle when its suppose to be around 1.5k.
Throttle sits at lowest setting on the carbs and the idle adjuster is fully out, so in theory, the bike should be stalling not idling too high.
Its a yamaha thundercat, carbed bike.
Any ideas?
Thanks in advance, Grant
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Ex bikes: 05 Suzuki En 125, '98 Yamaha Thundercat, '08 Honda cbr125, '05 Kawasaki z750, '03 Triumph Daytona 600, '91 Kawasaki ex250, '03 Hyosung Comet 125
Current Bike: '02 Suzuki TL1000R

[The Artist]

Air leak around the rubbers. Air is getting into the intake after the carbs.

[grant965]

[The Artist]

Get an aerosol, nothing too flammable but deodorant or something would be fine. Spray on each intake rubber with the engine running and the engine will rev up more when you spray on or near the leak.

[Fizzer Thou]

Are the throttle cables routed the same way as before the inlet rubbers were replaced?

Did you have to compensate with a higher idle speed before you replaced the inlet rubbers?
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Just talk bikes.What else is there?

Always have a 'Plan B'

[grant965]

[reckless_b]

Have you looked at the throttle cable, when you removed the carbs to change the rubbers did you alter its setting, is the throttle linkage sitting on its stop
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40 years on the road on and sometimes off bikes with a very recent OFF

[reckless_b]

Did a previous owner screw out the pilot mixture screws to overcome the leaky carb rubbers, is the choke fully closed.
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40 years on the road on and sometimes off bikes with a very recent OFF

[grant965]

Even with throttle disconnected it was the high idle.
I will give the mixture screw ago.
thanks
____________________
Ex bikes: 05 Suzuki En 125, '98 Yamaha Thundercat, '08 Honda cbr125, '05 Kawasaki z750, '03 Triumph Daytona 600, '91 Kawasaki ex250, '03 Hyosung Comet 125
Current Bike: '02 Suzuki TL1000R