honda 400 rancher\four trax 2002 .......want to know if the timing can be adjust

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my frined got a 400 and it has jumped its timing...it just backfires when ya roll it over now and we were tryin to find info on settin or adjusting the timing i kinda feel bad he has put like 5k int o this machine in just a few months i just want to try and help him out and fix it without it costin him more $