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E: Engine Carb Fault


Active Website User
VOC Member
This is a Main Jet Holder taken from a 4 Cylinder Suzuki and as can be seen is suffering.
Bike was laid up at start of Lockdown and started at least once per week.
Question is - has anyone seen this before and what can be done to prevent it happening in the future.
Thrash the thing - yes but there no where to go at present.
None of the other Carbs has this gunge on any of the other jets.IMG_1487.JPGIMG_1485.JPGIMG_1486.JPG

Comet Rider

Well Known and Active Website User
VOC Member
If this was the lowest carb, ie the bike is on a sidestand I would say it was the result of modern fuel, with its Ethanol content.
If the bike has a catalytic converter (unlikely with carbs) then get the Motul fuel additive if not try your local garden machinery supplier for some Aspen 4T which is a stable fuel alternative for 4 stroke engines

Robert Watson

Well Known and Active Website User
VOC Member
Don't use fuel with ethanol, especially if it is going to sit.
Ethanol is hygroscopic (absorbs water, especially in a damp atmosphere) and gives a great environment for the green fungus to grow. Great for plugging fuel jets, fuel filters and all sorts of little places in carburetors!