strange sound

eddvtr1000 · Post by **eddvtr1000** » Fri Jun 10, 2005 2:39 pm

how do, can anybody share some light on a strange happening.
every now and then when the bikes warm there seems to be what can only be described as a low "dunk" sound that seems to come from somewhere below me bits "no smart comments!"
is it me just being paranoid or stupid more to the point, could summut just be expanding with the heat?
any light shed on this would be gratefully recieved, cheers.

RAINMAKER · Post by **RAINMAKER** » Fri Jun 10, 2005 3:00 pm

oh ...............that'll be the engine then

iggy1966 · Post by **iggy1966** » Fri Jun 10, 2005 3:03 pm

nhr22259 wrote:oh ...............that'll be the engine then

No Sh*t sherlock!!!!

Eddie,

are you talking about a noise that seems to come from the carbs at low speeds or on tickover?? if so don't worry it's normal.

Other than that I have'nt got a clue

RAINMAKER · Post by **RAINMAKER** » Fri Jun 10, 2005 3:06 pm

Ok smarta**e.........don't think your answer is any better than mine

Johnny Wishbone · Post by **Johnny Wishbone** » Fri Jun 10, 2005 3:27 pm

Eddie, does the sound come with a loss of power, just for a split second?

eddvtr1000 · Post by **eddvtr1000** » Fri Jun 10, 2005 5:13 pm

hello again peeps, the noise is bizarr it just sort of happens, no power loss but i have noticed that it happens when im at a stand still or just stopped(dont know if id hear it on the move).

its not a rattle so maybe its something just expanding with heat, thanx for rattlin the old grey cells.

trebs · Post by **trebs** » Sat Jun 11, 2005 10:28 am

Ed, I think I have similar..
Standing still at lights, the occasional clout, thunk, donk. from the back pot.
Worried me at first as it sounded pretty mechanical. A quick blimp of the throttle though and everything seemed fine.
It's done it about 6 times now. Nothing has fallen off and the bike still goes like a monster.. so I figured it was a "feature"
Weird beasts, these big twins.

Trebs.

RAINMAKER · Post by **RAINMAKER** » Sat Jun 11, 2005 10:57 am

Think I know the answer to this...........cos I heard it yesterday, I think its a misfire, frim the spark plug sounds a clunk, donk slightly metalic sound hit with rubber hammer sort of soud, bet its that big slug of a piston

eddvtr1000 · Post by **eddvtr1000** » Sat Jun 11, 2005 4:17 pm

okee dokee then so nowt to worry about really, thanx for the input peeps.
see ya around

logan7 · Post by **logan7** » Sat Jun 11, 2005 9:36 pm

mines the same its part of the bikes nature i think

as i come to a stop at lights or junctions i blip the throttle stops it dieing just when you dont need it. allso it sounds great

RQ · Post by RQ » Sun Jun 12, 2005 2:51 am

Edd, it's normal. It's actually a backfire in the carbs. Just igniting a little early in the wrong place! Nothing to worry about, first time I heard it I thought I was gonna loose a dangly bit!

Johnny Wishbone · Post by **Johnny Wishbone** » Mon Jun 13, 2005 9:20 am

Edd, it's normal. It's actually a backfire in the carbs

Normal!!?? For you maybe you backfiring bog hound

ha ha ha...

Sounds like you need to balance that hog of yours. Mine used to backfire through the carbs occassionally when I got her. I jetted her a few months later, drilled the slides (front one was a bit tight too so I filed down the edges a smidge), set up the fuelling, and balanced the carbs.... has never happened since.

I'd probably start with a balance - if that doesn't solve it maybe set up the mixture - if she's running too rich (as most Storms do) you can get petrol, erm, not condensing, but kind of collecting and running down (since the fuel:air ratio is too high) the intake walls and occassionally going KABOOM thus giving you a carb backfire.

Oh, and RQ, pencil me in for Saturday night - I'll be leaving around noon.

eddvtr1000 · Post by **eddvtr1000** » Mon Jun 13, 2005 11:12 am

how do, the vtr has just had a big srevice before i picked it up and im informed that the carbs etc were balanced.
the mech who did it is a good lad (knows his stuff) plug for ross vernons in stafford.
anyhoo have fun peeps and if anybody thought about going to the show that i put in another thread i hope you didnt, i turned up yesterday morning and the chuffin thing was finished

Johnny Wishbone · Post by **Johnny Wishbone** » Mon Jun 13, 2005 11:55 am

Strange??....

maybe lean her out a little (quarter turn perhaps) and see how you get on.

stu9000 · Post by **stu9000** » Tue Jun 14, 2005 9:41 am

Interesting thread.
Looked into this myself a while ago.
It always felt like the clutch catching briefly to me.
Happened on warm up. I had to watch out for that first turn out of the drive in the morning cos she occasionally stalled mid turn (when i first got the bike and was getting used to her) which lead to rather undignified attempts to stop her falling on her ear. V uncool.

It makes sense to hear that its a back fire in the carb though, cos it seems to have lessened since i had a service.

Fitted leo vinci pipes which are fantastic but do get the occasional back fire first thing in the morning (guess that means she's running a bit rich).

I was told its a v twin thing. Ive either got used to it and keep the revs a bit higher till warm or its gone away since i got the carbs balanced cos I dont notice it anymore.

VTR1000.ORG

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