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Hi Guys any help or advise would be grateful.
Ok bike spec 1100s 99 v plate ,34 thou miles VDL exhaust and chip , brisk plugs , lennies air scoop and k&n , oils etc in order recent change, .went out for a tootle sunday after 5 miles out and bike begins to miss , opened her up to see if this would clear it , no cigar got worse to a point were the bike was loosing power / cutting out and popping more than the usual vdl exhaust noise . Got her home.no warning lights.
Tank off , plugs out look ok , plenty of fresh fuel no loose wires or anything to say what the issue is.
Answers on a postcard , going to have a trawl thru issues posted previous but if anyone has had this issue mail me .
Thanks in advance
Dave

One stick-coil breaking down?

Was it old fuel before topping up with fresh?

Still misfiring on new fuel?

Hi ,
No the "old" fuel was fairly fresh went to cadwell the other week and was running ok then.
As for coil other than having a specific test not sure got a feeling it is ignition side before pulling things off and replacing eh oh.
Mines a 99 model so the coils are under the tank

just been reading other posts re rough running /misfiring , going to check the fuel tank re poss water ? and clean the injectors as required ,of course any comments welcome

Difficult to diagnose but If you're going to check for water in the tank , change the fuel filter while you're there . After that it's really just methodical checking . Do a quick visual check for the small rubber blanking plugs under the throttle bodies on the vacuum take offs. ( one might be missing) Also the rubber inlet manifolds cracked badly on my bike a few years ago so I replaced them although bike was fine at the time) After that check the resistance of the plug leads just to be sure , if original they're nearly 20 yrs old , also it seems to happen more on GS's but make sure one of the throttle cable outers isn't unseated , if you open and close the throttle with the engine off you'll hear if the throttles are hitting the stop screws at different times when closing .
After all that I'd be doing a compression check/ check valve clearances just for peace of mind. I'd change plugs after all that just to see ?
After all that I think someone on here had a fuel pressure regulator problem ( sticking open I think?)

Thanks for the info , on with filter at present and will check those you have mentioned.

While you are in the tank, check the U-tube for splits and tight fit on the barbs. Mine had deteriorated so it was loose (only showed when wet, tightened up when it dried)

its easy to dismiss the simpler things. Start your diagnosis from a solid base - replace the plugs with brand new ones otherwise you can do lots of work when the plugs are at fault.

Hi ,
thanks for your replies , so checked pipework etc all ok, plugs good, spark good , fuel filter changed always a faff job but its done now , cleaned residue out of tank all ok , injectors cleaned and checked ok ,fresh fuel ,back together and taken for a shakedown without the bodywork on .
Started noted tickover too low , ran ok but started to fluff on part throttle between 2-3 thou it was noticeable , but not misfiring ,baulking as previous , took a look at you tube poss requiring idling set up ? to solve issue so I don't have the gauges so a trip to the dealer or anyone know a good ind mechanic in North Lincs .
Thanks Again for your input.
Dave

I can't help with a local mechanic but joking aside if you've no vacuum gauges you can make a manometer with some clear tubing , oil, and a piece of timber . To speed up the idle you can open the large brass air screw on each throttle body an equal amount as a temporary measure.
If you do decide to balance the throttle bodies yourself, it's best to check the valve clearances first, as these can have a bearing on the balance.


DSCF07922 by Nigel Burgess, on Flickr

sounds like a hall sensor issue