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I have a 1990 RXL that I have just rebuilt the top end because two pistons had lost compression. It started first pull but I am lacking mid range power between 4000 to 6000 rmp's. At 8000 it lets lose. It runs great on low RPM. All three pistons have 115 psi. I have changed all the fuel lines and filters and still can not solve the doggy like power issue. Any ideas? It feels like a fuel issue to me?
Scott
 

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Do not run the sled without the clutch installed or without a belt installed. That said, inspect or have the clutches inspected and install a new belt. Try again.
 
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