I get mine serviced at every 10,000kms but i dont have any mods or anything. If i had some mods i'd get it serviced at every 5,000km.
Theres a decal under the bonnet that tells u most things like when u should change the air filter, oil and filter, fuel filter and what the gap size in the spark plugs should be.
I'm not saying you should do exactly what it says but use it as a guide line