Start up BANG!

[butchgti]

Morning all,

I ride a CBR400rr thats kept outside under a plastic cover.

Recently when starting my bike a loud bang/pop comes out of the exhaust before it starts.

Anybody know why its doing this?

Cheers, Butch

[Mad Dave]

Fuel getting through to the exhaust and igniting there?

[Smart roadster]

Does it turn over a lot before firing? If so it is probably unburnt fuel in the exhaust that ignites as the engine fires.

[butchgti]

Yeah, the starter turns over...it bangs...scares the crap out of me...i pause...try to start it again and it fires into life!

Sounds like it is what you say, is this a problem that needs sorting?

[dern]

butchgti said:

Sounds like it is what you say, is this a problem that needs sorting?

I'd say so.

Has it got a cat by any chance?

[Smart roadster]

Proably just the cold taking the edge off the battery. Not a huge issue unless you go out at 5 am and upset the neibours. If it gets worse then it might be worth looking at new battery and or plugs.

[grant.d]

That happened to my mates bike, he never done anything with it just left it until he sold it on, it was fine
What kind of bike is it by the way?
Only proplem as stated is the neighbours going mad

Edited due to the fact that i cant spell!

>> Edited by grant.d on Thursday 8th December 17:58

[ninjaboy]

My ninja does that with the race can on sometimes, does it fire straight away or take a few seconds

[butchgti]

It takes a few seconds to fire when its freezing cold outside. Starts straight away in more mild weather though.

Its due for a service at the start of next year, so i'll get my mechanic to check it over then.

Cheers for advice fella's