Hesitancy at low - constant revs developed?

[alternative_vtr]

Hi folks, just developed an issue on ride home from work today. At a low constant revs for example 3000 rpm if I hold it at a steady 3000 rpm it will stutter and have a little hesitancy every few seconds. If I accelerate or ride at higher revs its fine and stops and if I wack the throttle open it picks up great plenty of power and no other symptoms. Its just started with this annoying fault. Only other stuff to add while I clutch at straws to find a reason is the petrol in the tank is about 5 weeks old and I just took the baffles out my cans.

The bike has run fine last time I rode it about 10 days ago, but I was running with baffles in my race cans then. I have ran without baffles before and it was fine. The bike is in good nick and low mileage.

Any pointers would be helpful, R/R is finned and battery has good charge.

[benny hedges]

check air filter / change plugs before you do awt else.
could be dodgy fuel though - bit of water in the fuel will do that

[Wicky]

Aftermarket cans presumably? Have the carbs been jetted to suit the can with or without baffles.

Fuel - Might be an idea to run what's left of the old fuel in the tank as if left standing it could have absorbed water from the air considering how much rain has been about.

Airfilter - standard or cleanable one. When was it last looked at?

Have you tried putting the baffle back in and seeing if that fixes it?

[lloydie]

if you fit the baffles back in and its better that means its running lean without he baffles .
a 1/4 turn out on the mixture should fix this .

try new fuel too

[alternative_vtr]

OK thankyou, my plan is to fit some new iridium plugs, blow airfilter clean with airline, put baffles in and put fresh fuel in and go for a ride. I won't get chance to do this till next week now but listening to what you're saying this seems a sensible list of things to do and try.

[Stratman]

If you do something and then there is a change, surely you restore what you did first to see if it still behaves that way, before changing plugs and so on?

Over the years I've read of loads of people who try the weird and wonderful because their Storm won't run right. In standard tune and if well serviced and set up, they run just fine.

Some after market cans require rejetting (turning the mixture screw will not compensate once the main jets come into play) whereas others, like Scorpions, don't need the carbs rejetting.

[lloydie]

If you do something and then there is a change, surely you restore what you did first to see if it still behaves that way, before changing plugs and so on?

Over the years I've read of loads of people who try the weird and wonderful because their Storm won't run right. In standard tune and if well serviced and set up, they run just fine.

Some after market cans require rejetting (turning the mixture screw will not compensate once the main jets come into play) whereas others, like Scorpions, don't need the carbs rejetting.

but as his problem is at cruse (steady 3000 rpm )and not at top end then surly thats the mixture .
i do think the baffles should be refitted to see if this solves the issue .

[alternative_vtr]

Baffles definitely will go in but I have been planning to do plugs anyway and cleaning airfilter won't hurt so will do that too. On the mixture screw, just a case of a quarter turn on both carbs and leave it at that?

[lloydie]

Baffles definitely will go in but I have been planning to do plugs anyway and cleaning airfilter won't hurt so will do that too. On the mixture screw, just a case of a quarter turn on both carbs and leave it at that?

do the baffles first before all else and go from there .

[VTRDark]

I agree with what Lloyd is saying but Stratman is also correct in that the whole setup will need to be changed for aftermarket cans and possibly filter. What filter are you using? You may get away with just richening the mixture a 1/4 turn but will more than likely need to richen the needles a tad too. You could get away with just shimming them. Mains should be good as they are unless you put an aftermarket jet kit in with different needle profiles. http://www.superhawkforum.com/forums/te ... -up-24769/

But first of all stick the baffles back in and see if this alters things and burn off the old fuel. If this improves things and you want to run with no baffles then some carb work is more than likely gong to be needed. But start with the easy stuff like making sure the air filter is clean, though a clogged air filter is going to richen things up as there will be less airflow. A carb sync may be a good place to start as well. What brand cans have you got? If none of the easy stuff resolves things then you may as well go the whole hog and shim the needles as adjusting the mixture (the easy way) requires carb removal.

(:-})

(:-})

[alternative_vtr]

Hi Carl, Lloydie & Stratman cans are Duns cans (were on the bike when I bought it) the bike has ran spot on until now but to be fair as it sounds nice with baffles in I have never bothered running with them out until now. Maybe the bike was borderline running lean all along and taking the baffles out has tipped it over the edge?

[leevtr]

Duns cans.....what are they mate, never heard of them ??

As far as it being absolutely necessary to piss around with the set up for aftermarket cans, I don't think this is always the case. I've had 2 storms, and both ran on race pipes for various periods of time, with no problems or running badly. Mind you I've always had a well known brand ( Scorpion, Remus, Leo Vince ) and they're probably not just a universal can with different link pipes. I think a lot of the lesser known brands may well me just that.

Put the baffles in, if it runs fine, you know its the cans. If thats the case my first port of call would be to save the pennies and get a decent set of well known pipes. If the cans you're running are that detrimental to the bikes performance, theyre probably not much cop.

[leevtr]

Duns cans.....what are they mate, never heard of them ??

As far as it being absolutely necessary to piss around with the set up for aftermarket cans, I don't think this is always the case. I've had 2 storms, and both ran on race pipes for various periods of time, with no problems or running badly. Mind you I've always had a well known brand ( Scorpion, Remus, Leo Vince ) and they're probably not just a universal can with different link pipes. I think a lot of the lesser known brands may well me just that.

Put the baffles in, if it runs fine, you know its the cans. If thats the case my first port of call would be to save the pennies and get a decent set of well known pipes. If the cans you're running are that detrimental to the bikes performance, theyre probably not much cop.

Have you got the original cans mate ?? Might be worth fitting them temporarily just to seet if it runs ok .

[alternative_vtr]

Well it was the baffles. I put them back in and went for a ride, during the ride I tanked up with fresh fuel too. It rus great again now. Thanks for the quick replies, it must be borderline a bit lean though surely, it might be worth me turning the pilot screws out a touch though I think.

[lloydie]

good news