Running on two cylinders

[Captk]

OK. The Bike (GS650E) been garaged for 2 years. New air filter element, Battery, oil and filter. cleaned petcock, new fuelfilter. New plugs.
Bike starts not a problem, runs.
Bike sounds like it is running on 3 cylinders, more likely two.
Spark to all four plugs, pipes on 3 & 4 too hot to touch, 1 & 2 barely warm.
Think it's a fuel problem, but my old dad used to tell me to leave thinking to a horse (it's got a bigger head).:shock:
Any suggestions on where to go next please.

[focus frenzy]

time to disassemble and clean the carbs.

[chef1366]

Lose the inline fuel filter, you may be starving the carbs for fuel.

[brveagle]

time to disassemble and clean the carbs.

i concur... the fuel filter will not effect just 2 of them...

[Billy Ricks]

Clean the carbs as Focus suggested. If the bike was on its sidestand the fuel made its way to 1&2 as the fuel began to evaporate from the carbs leaving 1&2 clogged more than the others.

[Captk]

You've just got to love this site and the expertise that's present
Between posting my query and reading the replies ( as well as checking the archives) I pulled the carbys off. Sure enough, jets and filters blocked on 1 & 2, cleaned 3 & 4 just to make sure. End result, 4 hot pipes and that AWOL cylinder has reported back for duty.
Just goes to show that you just gotta go back to basics every time.
Really appreciate your help.