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Discussion Starter #1
I have just got my bike out after winter here, did an oil change and pumped the tyres up, usual stuff.

Took it out for a ride and it was running fine, but after 15-20 mins I noticed it wasn't as smooth and when I slowed for a roundabout it feel very rough and was sounding like a twin.

Believe its misfiring but not sure why.

I didn't get an FI light or anything.

Topped up with fresh fuel but no change still seems rough.

I have started to strip it down to check the plugs but wanted to know if anyone had any suggestions? had problems like this before?
 

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I don't know how topping off fuel fixes the bad fuel in the tank already. It's perhaps contaminated and all you did was increase the quantity of perhaps bad fuel. DRAIN the bad fuel, add nothing but fresh fuel, and you will have at least ruled out fuel, finally. Topping off does nothing, perhaps increases octane lost, but stale gas or water in it, isn't going to go away making a cocktail of 50/50. Just wanted to complain about that myth many fall into.
 

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^ Tilt the tank up, and use a siphon hose to get into the very bottom of the tank.
You might have a bad fuel pressure regulator also. I would be highly suspect of that.
 

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You want to remove the petcock, and check the screen, and get any debris out that settles down around it. Put in a little fresh fuel and rinse it out while you're at it. I went on reserve on more than one bike and picked up garbage from the bottom of the tank into my carbs. A fuel filter is a good idea too when you have the tank off, especially on older bikes. Why they don't come with inline fuel filters from the factory is a mystery to me.
 

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They do have an inline filter, it's right next to the pump inside the tank.
Probably no petcock or reserve either.
 

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Discussion Starter #8
Well it probably wasn't the cheapest way to fix it but it appears to have worked.
Replaced all the spark plugs and stick coils, then siphoned out as much fuel as I could and added fresh, short test run went well so hopefully that's the last of the issues.
 
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