Todays patient was Yamaha FX-HO. He was sick and didn`t work well. This ski when engine start motor got shaky and engine response was so bad.
Check by PC diagnosis but no record available.
It was feel like spark problem so we tested by PC diag use active test mode then found #1and #3 did not spark when idling speed.
#1, #3 spark plugs been build up carbon, #4 was still sparked but been build up carbon too.After replace spark plugs this ski got over sick and come back good respons.
