Simon
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There could be some muck in the float bowl that’s floating around stopping the fuel
Blocked jets if a carb, the trouble with unleaded is when it’s left for a time it goes like varnish needs a strip down & clean, it’s worth getting some fuel stabiliser if your going to store it for a while.
Sorry might be a bit late, the hyosungs are pretty robust tbh, the charging side of things are a weak spot you do see mentions of camchain tensioners but all self adjusting types do have a basic flaw but that’s another story, valves should be checked they are a bit of a muck about to do but not to difficult, oil & filter changes are the important thing.
Is the engine turning over? If it is & its not starting its a fueling problem disconnect the relays give them a clean put them back in, the fact it’s not starting does say to me that it’s a pump problem, if the other systems are wrong it should still start admittedly it could be rough but should do something. You can enter a mode that will tell you what has failed but I’m not sure how on the gv650.
Have you joined the wires together? Is your battery draining? The f1 light is to do with the fueling/ignition electronics so the switch should not be causing that. If your charging system has gone up the wall it can cause all sorts of gremlins, the clicking will be a relay messing about that could be the cause most likely the fuel pump one.
It really is just adjust it until it feels right, suspension is a personal thing when it feels right for you then that’s it, I would move it up 2 notches & see.
I wouldn’t have thought you have a bent/damaged valve this would cause issues whether hot or cold, the losing power etc when hot could be a fueling problem check the intake manifold for leaks. A headgasket could do the same a simple compression test would be the quickest way to rule that out.
I would only think its worn that quick if it’s been ridden hard, check the adjustment first, just slacken the cable a little & see if it makes a difference, replacement is easy enough to do its worth changing the small brass washer behind the basket (only found on the 650) as well, one other thing what oil are you using? this could be the problem.
