Bad bottom end bog ? ET967

I have a friend having the same problem with a 964. Ran perfect last season. So far we've....

Changed exhaust
Changed every bit of electronics
Rebuilt pump including fresh drive shaft
New reeds
Swapped carb setup
Pulled head to inspect
Pulled exhaust valves to inspect

Only thing left is crank and wrist pin bearings .
 
I have a friend having the same problem with a 964. Ran perfect last season. So far we've....

Changed exhaust
Changed every bit of electronics
Rebuilt pump including fresh drive shaft
New reeds
Swapped carb setup
Pulled head to inspect
Pulled exhaust valves to inspect

Only thing left is crank and wrist pin bearings .

Are you sealing the bolts with silicone?
 

Yami-Rider

TigerCraft FV-PRO
Location
Texoma
Cracked pfp can cause a bog. I've also seen cylinder base bolts come loose and cause an air leak/bog. Re-torque everything and pressure the motor.
 
I'm having the same problem on a tpe 964 had a b pipe ran perfect put powerfactor on now has bad bottom bog changed jetting pop off changed atp epic to msd I'm usually pretty good at tuning a ski but this thing is kicking my ass
 

Roseand

Ready to RIP
Site Supporter
Location
Wisconsin
I'm having the same problem on a tpe 964 had a b pipe ran perfect put powerfactor on now has bad bottom bog changed jetting pop off changed atp epic to msd I'm usually pretty good at tuning a ski but this thing is kicking my ass
Running the pipe wet or dry?
 
No need to remove the pipe, just cap two of the 3 nipples and put a piece of hose on the third one. Put on some lipstick and give it a big blow. If you can push air in it’s cracked. If it pressurizes and your eyeballs turn red it’s good. I’ve repaired many cracked chambers and I’ve always been able to tell in 2 seconds if it’s cracked by 2 minutes of setup.
 
No need to remove the pipe, just cap two of the 3 nipples and put a piece of hose on the third one. Put on some lipstick and give it a big blow. If you can push air in it’s cracked. If it pressurizes and your eyeballs turn red it’s good. I’ve repaired many cracked chambers and I’ve always been able to tell in 2 seconds if it’s cracked by 2 minutes of setup.
What if I pressurize through the nipples held 10 psi for 10 minutes that way
 
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