Big bang starting the bike when cold.
 

so when the bike is cold and i start it, it usually idles at 2000rpm before the auto choke thing lowers the idle to around 1200 which it stays at, but for the past couple of mornings i start the bike and it initially idles at 1300rpm and then there is a bang which shakes the tank and the idle goes up to 2000 and the bike carrys on as normal? any ideas what this could be? its a 2003 pointy with a recent service, could it be spark plugs?

Re: big bang starting the bike when cold :/
 

Just unburnt fuel, my Curvy does it sometimes, it is nothing to worry about as long as it only does it the once on start-up.

Re: big bang starting the bike when cold :/
 

it does it most times i start the bike unless the bike is already hot? so just unburnt fuel? mot is tomorrow so may ask them just to look/confirm it :) cheers

Re: big bang starting the bike when cold :/
 

also the bang seems to be from the throttle body area and not the exhaust

Re: big bang starting the bike when cold :/
 

Yeah, it don't half make you jump when you have the airbox off balancing the carbs when it does it (I speak form experience!)

Re: big bang starting the bike when cold :/
 

cool nice one, was starting to duck when starting the bike just incase it blew up on me or something

Re: big bang starting the bike when cold :/
 

From your photo you have a pointy? So carb balancing issues are non existant as such.

I have got mine to misfire which sounds like more of a cough than a bang, but the sound comes from the airbox area. Dodgy spark plugs could cause this. Are they new / gapped properly?

big bang starting the bike when cold :/
 

I've had the bike 2 years and not changed the plugs, should I?

Re: big bang starting the bike when cold :/
 

Im not 100% sure of the proper service interval, but I have changed mine every 8k miles or 2 years since I got my bike. You could always pull them out and see what state they are in! Theres a good amount of charts online you can compare them to to see if they are healthy!

Big bang starting the bike when cold.
 

Gonna pull them out tonight to have a check :) cheers