Hoping I can get some opinions on what to look for to remedy a bogging issue on a 2013 bone stock Superjet, no mods what so ever.
Symptoms:
Hard start when cold: choke helps sometimes, other times need to pour a bottle cap of fuel into carbs to start
Once started idle is more or less OK until warm
As soon as any throttle is applied engine falls flat and dies. Even the slightest throttle input causes an immediate bog. Hard hit on the throttle from idle produces same result, engine falls flat and dies.
Steps taken:
Cleaned and rebuilt carbs. Found diaphragms on both carbs stuck to the cover plate (had never seen that before). N/S looked fine, weren't stuck. Small filter on the pumps had some contamination but very little. Tamper caps are still on so no changes to needles
Checked one way valve on tank, it works and tank holds pressure
Cleared out return line, no obstruction, steady stream from front carb when tank is pressurized
Cleaned out fuel filter and inspected for water, no water present in filter
Emptied fuel tank, found small amount of water in bottom of tank, cleaned out the tank and filled with fresh fuel/oil
Changed to new set of spark plugs
After doing all the above, the ski started right up on the trailer and idled normally, throttle response was normal, thought problem was solved. BUT next morning, hard start again and same bogging symptoms as before. So back to square one.
Any suggestions on what I should check for next.
Symptoms:
Hard start when cold: choke helps sometimes, other times need to pour a bottle cap of fuel into carbs to start
Once started idle is more or less OK until warm
As soon as any throttle is applied engine falls flat and dies. Even the slightest throttle input causes an immediate bog. Hard hit on the throttle from idle produces same result, engine falls flat and dies.
Steps taken:
Cleaned and rebuilt carbs. Found diaphragms on both carbs stuck to the cover plate (had never seen that before). N/S looked fine, weren't stuck. Small filter on the pumps had some contamination but very little. Tamper caps are still on so no changes to needles
Checked one way valve on tank, it works and tank holds pressure
Cleared out return line, no obstruction, steady stream from front carb when tank is pressurized
Cleaned out fuel filter and inspected for water, no water present in filter
Emptied fuel tank, found small amount of water in bottom of tank, cleaned out the tank and filled with fresh fuel/oil
Changed to new set of spark plugs
After doing all the above, the ski started right up on the trailer and idled normally, throttle response was normal, thought problem was solved. BUT next morning, hard start again and same bogging symptoms as before. So back to square one.
Any suggestions on what I should check for next.
