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One cylinder coughs and lingers while opening the throttle

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Micha
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One cylinder coughs and lingers while opening the throttle

Post by Micha »

The phenomenon is almost completely gone when the engine is warmed up, but there is still a slight hesitation when opening the throttle.
That side also smokes more the the other.
A friend said that I might run a bit lean on that side.
I think the opposite, that the mixture might be to rich.

Your thoughts, please?
Michael Steinmann
R51/3 1952
Engine Nr. 529466

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schrader7032
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Re: One cylinder coughs and lingers while opening the throttle

Post by schrader7032 »

Hard to say. I'd try one of the adjustments and see what happens. Then try the opposite adjustment. Easy enough to adjust the screw that controls the air into the idle circuit.

Have you confirmed that the slides are rising at the same time as you twist the throttle? Pull the tubes feeding air into the carbs. Twist the throttle while watching the slides. This can be done with the bike not running.
Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.

xackley
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Re: One cylinder coughs and lingers while opening the throttle

Post by xackley »

After I am satisfied with the Idle Air adjustment and roughing in the cable adjustment I go for a ride.
I leave the left locknut loose so I can finger adjust the cable slack. After a few tries It has a good even feel.
Don

Edi: new cables will need adjusting again after a few hundred miles.

Edit2: and check the plugs, they will tell you if the mix is good.
1958 R69, 1972 R75/5, 1980 XS650, 1982 GL1100, 2003 guzzi ev, 2017 guzzi V7!!!
All on the road, going no where in particular in the Finger Lakes of New York

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jwonder
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Re: One cylinder coughs and lingers while opening the throttle

Post by jwonder »

Micha, I would suggest seriously getting a Gunson Color-tune and tuning with that. I always tune to a nice blue and then go 1/4 turn in on the air screw to let the motor come off idle. It will also let you know if you have a bad carb or other issue.
James Wonder
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Long Island, New York

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