20-08-23, 03:57 PM
What a PITA. 
First, I suggest assume nothing. New spark plugs can fail, cleaned carbs can still have bits of crud which get dislodged after a few hundred kms use - particularly if you've used all the power!
I'd start by pulling each plug cap in turn to see if the misfire is electrical - ie, plug, plug cap or plug lead.
If you can't pin it down to electrics, start by taking the carb tops off to check that the needles and diaphragms are OK.
Check the fuel filter.
Check the air filter and the air intake.
I don't think it's EXUP-related as a stuck/misaligned valve won't cause those symptoms.
Check electrical connections and earths. Take a close look at the multi-pin connector under the left side of the tank - the one in the rubber boot that you would have moved doing the Ivan's installation.
You are probably thinking to pull the carbs straight away but eliminate other possibilities first.
Good luck!
First, I suggest assume nothing. New spark plugs can fail, cleaned carbs can still have bits of crud which get dislodged after a few hundred kms use - particularly if you've used all the power!
I'd start by pulling each plug cap in turn to see if the misfire is electrical - ie, plug, plug cap or plug lead.
If you can't pin it down to electrics, start by taking the carb tops off to check that the needles and diaphragms are OK.
Check the fuel filter.
Check the air filter and the air intake.
I don't think it's EXUP-related as a stuck/misaligned valve won't cause those symptoms.
Check electrical connections and earths. Take a close look at the multi-pin connector under the left side of the tank - the one in the rubber boot that you would have moved doing the Ivan's installation.
You are probably thinking to pull the carbs straight away but eliminate other possibilities first.
Good luck!