Knock sound

poshman · Post by **poshman** » Thu Dec 22, 2005 6:47 pm

I have just bought a storm and im thrilled to bits with her. its only done 11000 miles on a s plate(98) .It goes like a dream and the only thing ive noticed is that if i slow down on the brakes and dont change down gear, say ive been doing 30 slowing to 15 (or slower) ive held the clutch in all the way when i blip the throttle (with the clutch still in) theres a knock. its happened a coupple of times. its got straight through(not for road use) ART race cand on at the mo and i cant tell if its cam chain rattle or what because its so loud. any ideas or people experienced the same prob?
Many thanks
Alex

Zer0Zer0 · Post by **Zer0Zer0** » Fri Dec 23, 2005 11:16 am

a Knock?? are you sure its not a backfire through the airbox?..
might need the carbs balanced!..

poshman · Post by **poshman** » Sat Dec 24, 2005 10:43 am

At first i couldnt think what it could be but now youve said that and having a good listen thats exactly what it is. Off to the dyno then.

Sharpe1 · Post by **Sharpe1** » Sun Dec 25, 2005 5:21 am

I wouldn't worry too much about the backfire, they all do it. Welcome, by the way.

xxxrated · Post by **xxxrated** » Thu Jan 05, 2006 11:34 pm

mine does that every now and again, normally just before it cuts out. i was told by a mechanice its nothing serious on these bikes but i cant remember the reason why. ill have to go down and ask him again

xxxrated · Post by **xxxrated** » Mon Jan 09, 2006 3:40 pm

found out today what the problem is, the carbs need balancing. going to get it done next week hopefully so ill post up and tell you if its what caused the problem but im pretty sure it is

poshman · Post by **poshman** » Mon Jan 09, 2006 5:47 pm

Thanks for the help folks. It hasnt done it for two weeks (ride it everyday). I think it was sat for a while before i bought it, dont know if that would contrabute to the backfire or not. if its starts doing it again ill get it sorted

stu9000 · Post by **stu9000** » Fri Mar 31, 2006 4:01 pm

Mine does it too. Always thought it was a bit weird but its never got worse.
Maybe my carbs need balancing cos it hasnt been done in a while.

It is weird though, I can feel it through the seat.

Jesper · Post by **Jesper** » Fri Mar 31, 2006 9:40 pm

I get the odd knock from the cylinder pointing at our balls - think it just need balancing and carbie clean, maybe along with new plugs - after all it is a 98 ( 8 years old ) so if it has happened more tha once and the engine hasn't crapped it self the problem is more than likely in your head and could be soted/smoothend out with a good service

Anonymous · Post by **Anonymous** » Sun Apr 02, 2006 10:19 am

i have found that they need balancing a bit more often than they say you should do it
i do mine once a month only takes ten mins as i have fitted pipes and t'fittings so i dont have to remove the tank
but even then it still does it every now and again but now it doesnt stall like it used to
ei also relocated the carb breather tubes under advice from a couple of other extremely trusted mechanics

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Knock sound

Knock sound

burble burble donk

knocking