??? Motorcycle hv timing belt???

have lah.. some bike mod to timing belt... & didnt use sproket & chain like us.. 
but most seen at Virago, Jaguh, Harley... 

lol.. those on harley and virago are called shaft la, not timing belt
for scooter it's called roller..
actually for cupchai there's no timing belt, but it's timing chain one. it's a small chain that connects crankshaft to the camshaft which will make them move simultaneously on the same time. read more here. but AFAIK, timing chain should be serviced after 30 000km of use. it's hard to broken unless he rode his bike like rempit one.

about the tyre, take a look if he's using sport rim or rim lidi one. if sport rim, that means he's using tubeless tyre which is known for its durability and hard to bocor one unless he hit potholes often (the tyre will inflate / got 'swollen' at one part). if got the swollen mark, then the tyre is useless.

I think he juz try to escape from his job, giving excuses.. Juz my opinion..