Mk 1 speed triple problem slow to return to idle

Hi all,
Looking for help with a problem with my Mk 1 speed triple, the bike is very slow to return to tick over and sometimes sticks at about 3k, the throttle action is ok, returns with a crack, so don't suspect the cable. Have checked for air leaks around Carbs, all ok.
Also have noticed that the rev-counter does not return to zero when turning off the engine, stays about 500 rpm, it only returns to stop once ignition is turned back on, have tried another rev-counter and it does exactly the same. Cant see how the two problems are linked but the chance of two tachos being faulty is strange.
Bike as done just over 10K, starts and idles ok and runs ok other than this, my next plan is to balance the carbs.
Any help or suggestions greatly appreciated.

Thanks Pat

 

Hi Steve,
Thanks for the reply. I have owned the bike since 2002, its a 1997 reg and I got it with only 1k on the clocks. I dont do many miles a year on it, a few road miles and the odd track day each year, the bike is stored over winter with fuel stabilizer in the tank and as never been a problem until now. I am running a bottle of Redline fuel system cleaner through it at the moment to see if it helps. Thanks for the tip on Marvel Mystery oil will try it once problem fixed.
Will have a look at the carbs and balance them.
Thanks
Pat

 

Hi Steve,
Its a great bike, still enjoy riding it after 12 yrs. Its one of the last Mk1 Speed Triples, in black, 6 speed version, gold calipers etc. Like all the early Hinckley bikes its a bit heavy and carries its weight quite high, which makes it hard work on the twisty bits, especially on the track. But on the road the weight makes it feel solid and well planted, as for performance its never going to compete with modern sports bikes but is adequate for a naked road bike, what it lacks in performance, it more than makes up for in looks and sound. They seem to be getting quite rare now and finding a good one quite difficult, if you want one now might be the time to buy, they