Super Jet Superjet bog at 3/4 - wot

jeepinxj

jeepinxj

Location
Algonquin, IL
Have a 62t that I can't figure out what is going on. Has ran perfect for year then one day at wot ish it bogged and slowed and had to feather the throttle. Bottom end is good and it will be fine for a second at wot then bog again. Carbs have been rebuilt with mikuni kits. I swapped coils and same thing. Anyone have an issue like this?

Fuel selector is gone, perfect compression, tank pick ups are good, no exhaust leaks
 
Pro-pulsion

Pro-pulsion

Location
Ontario, Canada
There are quite a few factors that can make this type of symptom arise, could you elaborate on the engine more? Stock? Engine size bore/bored? Carbs? Mods? Year? Any other maintenance work done other than carb kits or is the rest original and never seen a wrench? Any additional tests performed such as crank case pressure testing, one way valve on the tank checked and passed etc?

Without further details the most generic answers that will be offered are possible defective fuel tank vent not allowing air into the tank therefore starving the fuel supply, this will take only about a minute or so of run time before the engine acts as you mention. After that the most common responses will most likely be the CDI is failing, there is an issue developing in the stator, or the reeds are either broken or not seating.
 
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jeepinxj

jeepinxj

Location
Algonquin, IL
It is a 1mm over 760 ada head with a b pipe. I just replaced crank seals but this issue started before replacing the seals. It has msd enhancer with stock 44mm'. I have another cdi I will try after double checking the fuel tank vent. After that will be the reeds thank you for your help
 
jeepinxj

jeepinxj

Location
Algonquin, IL
Checked most of what was suggested and have new fuel filters, one way seems ok. Pulled reeds out and 3 don't look to be tight hope that is the issue
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