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Does anyone know the value clearances for 1.8?
I've got the values for the 8th gen from the Haynes manual, but not the 9th gen. Given there is a reasonable power difference between the two generations I'm guessing that Honda made some changes.

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Hi,

for the Civic Mk9 i-vitec 1.8L R18Z4 engine (and street usage) values are 0.20mm intake and 0.25mm exaust.
Simple manual mechanical adjustment, you can DIY. Usually if the engine runs on petrol it is not a big problem, the valves tend to slightly open and you can check them every 40000km. On the other hand, if the engine runs with an LPG system, the valves tend to close, and must be adjusted every 15000km for a long life of the valve seats.

Cheers
 
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