What's in a noise?

[Demonic69]

Hi All
So I'm new to V-Twins and still getting used to the thumping going on near my sensitive areas.
I've been riding it for a week or so now and it's certainly good fun, but I can't tell if it's running right or if I'm just imagining things.
More recently (after a run out last weds) it seems to sound like it's slapping a bit, that's the only way I can explain it! The noise from the exhaust is a bit more like a bang than a rumble and it seems to want to backfire and burble on the overrun.
Am I just being paranoid or is there somewhere I could start looking?

Cheers

[macdee]

If you sort out the cct on the bike most of the worries will leave you as far as the engines goes
Mcct or stopper mod for peace of mind

[Demonic69]

Thanks for the reply.
It's got manual CCTs already, not sure how to know when to adjust them. Just reading through the reams of information you guys have (seriously, I'm a member of lots of forums and not a one has the vast knowledge base this one does!)

Cheers

[Wicky]

Turn up to an event (Workshop day/ rideout) so somebody can listen to your Storm beastie for untoward noises that can be hard to describe in words.

The most common noises are 'carb fart' (perfectly normal), suck squash bang & blow, and the occaisonal CCT 'death rattle'. Banging on overrun usually a sign of fuel weakness/airleak in the exhaust /intake. Have you checked the header/link pipe gasket seal and manifold gasket for leaks? Carbs seated properly ? And if you have a more freer flowing aftermarket can this will be noiser than standard and might need rejetting/dynoing for optimum performance.

[Demonic69]

Turn up to an event (Workshop day/ rideout) so somebody can listen to your Storm beastie for untoward noises that can be hard to describe in words.

The most common noises are 'carb fart' (perfectly normal), suck squash bang & blow, and the occaisonal CCT 'death rattle'. Banging on overrun usually a sign of fuel weakness/airleak in the exhaust /intake. Have you checked the header/link pipe gasket seal and manifold gasket for leaks? Carbs seated properly ? And if you have a more freer flowing aftermarket can this will be noiser than standard and might need rejetting/dynoing for optimum performance.

Cheers Wicky
I do plan to meet up as soon as I get chance. Even if it's just to listen to other bikes and see if mine's "normal"
That's given me some ideas of thing I need to have a look at. I'll check the exhaust and the carbs. It does seem like something might have rattle loose after a ride.

Cheers

[TravisZack]

I've had the same thing recently. It doesn't sound as deep and throaty as before, it's got a harsher kind of crack to the exhaust note. Also surging at 4k rpm, which I'm slowly trying to fix.
Was all good (I think) before removing PAIRS and fitting a quick shifter, so maybe I should refit PAIRS and disable the QS, see what happens.

[VTR Phoenix]

I've had the same thing recently. It doesn't sound as deep and throaty as before, it's got a harsher kind of crack to the exhaust note. Also surging at 4k rpm, which I'm slowly trying to fix.
Was all good (I think) before removing PAIRS and fitting a quick shifter, so maybe I should refit PAIRS and disable the QS, see what happens.

Sounds like a plan, start from scratch and go from there.

[Demonic69]

PAIRS, pain in butt rear shock?

[popkat]

PAIR is a Pulsed Air Injection, draws clean air from the air box through reed valves in to the exhaust post combustion which ignites any unburnt fuel, it's an emissions thing.. on a storm you can flip the reeds over remove hoses and blank off.



.

[MacV2]

PAIR is a Pulsed Air Injection, draws clean air from the air box through reed valves in to the exhaust post combustion which ignites any unburnt fuel, it's an emissions thing.. on a storm you can flip the reeds over remove hoses and blank off.



.

PAIRS only fitted to later Storms in the UK...What years your one ?

[Demonic69]

Ah, mine's a 97 so not on the list of bits to worry about

[Dendrob]

PAIR is a Pulsed Air Injection, draws clean air from the air box through reed valves in to the exhaust post combustion which ignites any unburnt fuel, it's an emissions thing.. on a storm you can flip the reeds over remove hoses and blank off.



.

Worth knowing, cheers. Mine's an 02. Haven't looked in that detail yet.

I have an fmx650 motor which is nestling in a cb250rs frame. That came with hoses into extra ports under the exhaust ports. Must do a similar thing? They're getting blanked off.