It's supposed to be 0.16-0.20 on the exhaust side, so yes, it shouldn't be over 0.20.

In practice 0.02 over probably wouldn't do too much harm, but I don't understand quite why you can't set it within the proper range. Do you literally only have one gauge, not a set? How are you going to do the inlet side?

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XT660Z - Commuter, Adventurer...Racer?

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Other bikes >> MT-03 / CG125BR-J / ER-6F
Departed >> ZXR400L3 / EC300 / DR-Z400E / DR800S / GPZ500S / GS400