Diagnosing a noise..possible Red98 victory but he did sort my leads ;)

[noggythenog]

Well........

Aw foc...i was hoping i could keep quiet & nobody would see me...it's really windy down here...blowing a gale so it is :groan ....i'm all for getting blown off......jus not on the bike :b




All is ready to test though & i'm hoping it blows through soon with some calm afterwards.




If not then i'll get out anyway late afternoon but not sure i'd hear the noise anyway in this wind.




Listening to tick over i reckon there's still a little rough running on that cylinder but, i couldn't see any more arcs but once every 10 seconds or so there's a pronounced drop....could just need a carb balance though.

[noggythenog]

Actually im just being a gimp aint i........i'll get me kit on......weather only gonna get worse today.

[noggythenog]

Ok just did 30 miles through the hills to get her warmed up & me cooled down brrrrrrrr.....was an experience trying to stay upright in the wind.


Firstly the leads......the bike is running much much smoother & feels more powerful.




The noise......didnt do it when i left the house, or at the junction to my street......i turned round at the top of the hills in a gravel lay-by.....& i got 1 ping.......so that could lend to the stones on fender theory.




When i got back to town i visited the local multi story car park as it is sheltered....smoothe, non stoney surface & noise travels well......did a few move offs & not a peep.....got fuel, thrashed her through the gears on the airfield & came home & not a single noise....... Tick over is now lovely.




So we defo resolved an underlying issue thanks & i think now that i know the plugs are all fine when it heats up & i go out for a decent run (hot, tyre, sticky, stones) then i'll analyse it a bit further.

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[/size][size=78%]But thanks for all the help.[/size]
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[/size][size=78%]The bike is stonking fast now.[/size] 8) [/size][size=78%] [/size]

[TonyW]

I reckon the noise is one of the anti-rattle springs on one of the front brakes. A slightly warped disc or gummed up disc bobbins causes the pad to rotate slightly in the caliper. look for witness marks where the top and bottom of the springs can touch the caliper.
A SLIGHT pressure on the front brake will stop it happening if it is this

[noggythenog]

I reckon the noise is one of the anti-rattle springs on one of the front brakes. A slightly warped disc or gummed up disc bobbins causes the pad to rotate slightly in the caliper. look for witness marks where the top and bottom of the springs can touch the caliper.
A SLIGHT pressure on the front brake will stop it happening if it is this

That's an interesting theory Tony.....i know foc all about brakes...haven't attempted them yet or even dismantled a set.......but what would make the noise though...i thought these springs touched the caliper anyway & were held in place by the pin.....are you saying for instance the warped bit of caliper comes round & then pushes the pad backwards which hits the spring & creates the noise?????.

[TonyW]

Pretty much yes. If you rotate the wheel by hand look for movement on the spring ends (red arrows)

[noggythenog]

Cheers Tony, i'll give that a try, thanks for the pic.




It is quite a pronounced noise though, i'd be surprised it was that unless under tension or allot of impact but hey who knows noises are strange things to figure out.


Ta


Nog 8)