Loud bang on start up. - SV650.org

02-03-09, 09:27 AM

I think i read a thread about this before but cant seem to search it.

Firstly im pretty sure my carbs need balancing as the bike misfires ever so slightly (mainly when warm).

when i started it up from cold the other day there was a massive bang that frightened the life out of me! just wondering if this was due to the carbs being out of balance or it was something else...

Cheers

02-03-09, 09:32 AM

Haha! Don't worry about the loud bang, I've had a few - its just some petrol vapour igniting in the exhaust and not in the engine - perhaps some unburnt fuel made it through to the exhaust or something when you turned it off the time before the bang.

A carb balance will help with the miss-fires when the bike is running; i assume its due to being ever so slightly "rich". DO you have an aftermarket loud exhaust fitted? they can induce a bit of popping and banging

02-03-09, 09:37 AM

no its a standard exhaust. i thought i had been shot when it banged! haha very loud in the garage!

i think i may have heard it 'pop' while riding yesterday too...

im going to get her serviced at the weekend i think, keep meaning to do it myself but never find the time!

02-03-09, 09:39 AM

i meant to say....would something to do with the choke plungers / cable cause it run slightly rich?

The choke doesnt feel loose or anything when i operate the lever for it...but im not sure if it woud feel different?!

02-03-09, 09:40 AM

How many miles since it was last serviced? You might need a new air filter (if the current one is clogged up, then it'll richen up the fuel/air mix i think?) and maybe you need new spark plugs too. Dont worry tooooo much, its not a big problem as long as you get it looked at now

02-03-09, 09:42 AM

its probably been a couple of thousand miles, just over...

a full service would sort her out then i guess!

Dave20046 · 02-03-09, 09:48 AM

?I pride myself in my banging

...nothing to worry about

02-03-09, 09:56 AM

Quote:

Originally Posted by Dave20046

?I pride myself in my banging

...nothing to worry about

haha

cheers guys!

02-03-09, 11:21 AM

Yeah don't worry had this happen a few times too. Makes me jump out of my skin!

Dave20046 · 02-03-09, 11:32 AM

Quote:

Originally Posted by vardypeeps

Yeah don't worry had this happen a few times too. Makes me jump out of my skin!

has the same affect on frale old women and dogs.

02-03-09, 09:27 AM	#1
Tomtoms Guest Posts: n/a	Loud bang on start up. I think i read a thread about this before but cant seem to search it. Firstly im pretty sure my carbs need balancing as the bike misfires ever so slightly (mainly when warm). when i started it up from cold the other day there was a massive bang that frightened the life out of me! just wondering if this was due to the carbs being out of balance or it was something else... Cheers

02-03-09, 09:32 AM	#2
Alpinestarhero Guest Posts: n/a	Re: Loud bang on start up... Haha! Don't worry about the loud bang, I've had a few - its just some petrol vapour igniting in the exhaust and not in the engine - perhaps some unburnt fuel made it through to the exhaust or something when you turned it off the time before the bang. A carb balance will help with the miss-fires when the bike is running; i assume its due to being ever so slightly "rich". DO you have an aftermarket loud exhaust fitted? they can induce a bit of popping and banging

02-03-09, 09:37 AM	#3
Tomtoms Guest Posts: n/a	Re: Loud bang on start up... no its a standard exhaust. i thought i had been shot when it banged! haha very loud in the garage! i think i may have heard it 'pop' while riding yesterday too... im going to get her serviced at the weekend i think, keep meaning to do it myself but never find the time!

02-03-09, 09:39 AM	#4
Tomtoms Guest Posts: n/a	Re: Loud bang on start up... i meant to say....would something to do with the choke plungers / cable cause it run slightly rich? The choke doesnt feel loose or anything when i operate the lever for it...but im not sure if it woud feel different?!

02-03-09, 09:40 AM	#5
Alpinestarhero Guest Posts: n/a	Re: Loud bang on start up... How many miles since it was last serviced? You might need a new air filter (if the current one is clogged up, then it'll richen up the fuel/air mix i think?) and maybe you need new spark plugs too. Dont worry tooooo much, its not a big problem as long as you get it looked at now

02-03-09, 09:42 AM	#6
Tomtoms Guest Posts: n/a	Re: Loud bang on start up... its probably been a couple of thousand miles, just over... a full service would sort her out then i guess!

02-03-09, 09:48 AM	#7
Dave20046 Member Mega Poster Join Date: Jul 2008 Location: Sheffield Posts: 10,274	Re: Loud bang on start up... ?I pride myself in my banging ...nothing to worry about __________________

02-03-09, 11:21 AM	#9
vardypeeps Guest Posts: n/a	Re: Loud bang on start up... Yeah don't worry had this happen a few times too. Makes me jump out of my skin!

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