SOHC.co.uk Forums > CB500/550

Jet size

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TezzerTel:
I'm just looking at my carbs and with people saying that replacement jets can be very hit and miss I'm just wondering what size a 100 main jet should actually be so I can measure what I have?

Nurse Julie:
If they are OEM Keihin, they will have the size stamped on the side of the jets Terry.

Sesman:
I believe 100 denotes 1mm bore, but could be wrong. Eg, a 40 idle jet denotes 0.4mm.

TezzerTel:
Yes I was thinking that 100 could be the size in hundreds of a millimeter

McCabe-Thiele (Ted):
Might be difficult to measure the narrow orifice.

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