The bike has been sitting in my garage for 6 months in the dry. i put a fully charged battrey on the bike. turn the bike on and press start and just get a click. cheeked the fuses and all ok. could it be the starter motor i was thinking.

The battery could be ***** could have voltage but not crank power.

if worked fine before cam tensioner fitted, i wonder if cam chain slipped a tooth or more on a cam

As this point you can't get the bike to turn over is this correct? If the engine is turning over but won't start then yes the gas is most likely the problem. Gas after sitting for even a month can evaporate from the fuel system and it leave a fouls smelling deposit behind that clogs up everything. It stinks and it's a mess to clean out. To prevent this from happening use a product that is called "Fuel Stabilizer" in the last few tanks of gas before you put the bike away for the winter or a dormant period. If the motorcycle is in a hot climate or heated garage this foul smelling gas can happen within a few weeks.

I would have the bbattery tested, bike batteries are prone to just going oopen and u have zero output, it is very unlikely anything else is wrong.

You might have to disassemble the carb to clean it. As the fuel dried up it left/leaves a residue that sometimes cloggs up the jets!

Yes the fuel can get old sitting in the carbs, as they are vented.
With luck you may be able to open the drain screws on the bottom of each carb and drain the bad fuel and it may start.( a squirt of aerostart fluid may help it fire)
Sometimes when fuel dries out in carbs it leaves a residue which can block jets, this needs the bowls removed and cleaned.
Charge up the battery while you do this, as i have had batteries that put out enough amps to spin the starter motor, but this drags the voltage down and the electronic ignition wont fire.

Hi, Do you have an alarm & Immobiliser fitted on your bike as these drain the battery on your bike very quickly? If so i would recommend removing your battery and fully charging it with a decent amp-age charger. If you have your garage attached to your house then i would definitely recommend purchasing a trickle charger and when not using your bike keep this plugged into the mains and you should not have this problem again. all motorbike shops sell these chargers If after this the battery goes flat again i would suggest purchasing a new battery. This is a common fault as most motorbikes sit in the garage through the winter months and if not kept on charge will deteriorate. Hope this helps.

Sounds like it. However ensure its fully charged or use a jump pack or similar....check charge rate on the bike.

try cleaning the carb completely off the bike, make sure you take the jets out and clean them well.

They are probably gummed up....gas does not last long after 30 days anymore before it begins to varnish and clog parts.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

Fuel injected right? Sounds like you have some fuel injector issues now that the gas has varnished them up. Use stabilizer in the fuel anytime the bike will sit that long without being ridden.