Whiff of Gasoline?

Tornado · Jun 2, 2023

Last little while been getting a whiff of petrol when idling at stop lights etc. Was thinking from surrounding cars but now think it's my bike. Seems mostly from left silencer end. All seems to be running well. Normal or adjustments needed?

ILLF8ED · Jun 2, 2023

Is it possibly dripping from the bottom of one of the carbs? I have had two experiences with this.….float bowl screw fell off and tickler stuck open.

Tornado · Jun 2, 2023

ILLF8ED said:
Is it possibly dripping from the bottom of one of the carbs? I have had two experiences with this.….float bowl screw fell off and tickler stuck open.

I checked a few times for leakage at carb bowls, connection lines and all around under tank. No signs of liquid or residue with any smell to it, just the normal layer of oiliness.

ILLF8ED · Jun 2, 2023

Humm….keep looking I guess.

73NortonRider · Jun 2, 2023

Tornado said:
Last little while been getting a whiff of petrol when idling at stop lights etc. Was thinking from surrounding cars but now think it's my bike. Seems mostly from left silencer end. All seems to be running well. Normal or adjustments needed?

Hot weather and gas cap venting?

Tornado · Jun 2, 2023

73NortonRider said:
Hot weather and gas cap venting?

Possibly. Not that hot here yet, 22 C or so.
I'm thinking an over rich idle setting. Will pull plugs to see if sooty.

luckyed · Jun 2, 2023

“I love the smell of gas in the morning!”

Tornado · Jun 3, 2023

So left side plug heavily sooty right side lightly sooty. Unsure why. Fitted new plugs and been out about all day so need to check them.

ILLF8ED · Jun 4, 2023

One more thought…left carb main jet block unscrewing. This has happened on various Commandos more than once on club rides.

Tornado · Jun 4, 2023

ILLF8ED said:
One more thought…left carb main jet block unscrewing. This has happened on various Commandos more than once on club rides.

Yes could be. Had that happen some time ago on original amals, symptom was misfiring under open throttle, gradually getting more frequent over a few weeks. This seems different but may just be starting to happen. Will tear into carbs soon.

Whiff of Gasoline?

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