We put a SBT Shortblock motor in a customers ski this April. Everything went smooth on the install. When the customer got the ski to the water, the ski only would turn 4200 RPM's. The customer brought the ski back to the shop for me to go test. We ran the ski, and the ski would never turn over the stated RPM's. We rebuilt the carbs, drained the fuel tank, troubleshot the electrical box etc. After all we did, nothing changed. We removed the motor to find that the woodruff kew holding the flywheel had failed, throwing off the timing. We went to the local Polaris shop, and purched a OEM Polaris woodruff key. The Polaris OEM key was considerable different from the key used by SBT. The Polaris OEM key seemed more beefy, and was tapered on the rounded side unlike the SBT Key. We finally get the motor back together, and started putting the motor back into the ski. While doing so we noticed that the rear crank seal on the motor was sticking out of the case about 1/8" out of the case. I opeted to call SBT, and they gladley sent me a call tag for me to ship off the motor once again.
After we received the 2nd remanufactured motor, the intall went smooth as uaual. I did not replace the SBT woodruff key account I did not have one on hand. I finally get this ski to the lake, and now the ski will only turn 4900 RPM's. After inspecting the motor and going threw all the hoops, I noticed that the 2nd SBT motor had the rear crank seal sticking out of the case like the 1st motor.
I have yet to pull the motor again, but I'm afraid that I might have sheered the key again. I did all the testing on the 2nd motor, and there was no apperent back fire. "NOTE" the Polaris flywheel was in good condition, the pto, driveline, and pump were also in good working condition with no apperent vibrations etc. All this was was cleaned, inspected on both motor installs.
My question is, has anyone had this type of problem? Does SBT have any suggestions on what might have happened? Did SBT rebuild the first motor that they shipped me? Could the problem be in the SBT crank.
Needless to say I have exhausted myself trying to get this ski back on the water for my customers. My customers have been without a ski since April. I am out countless numbers of hours working on this ski, not to mention driving 85 miles one way to do the testing on the water.
Can anyone help?
After we received the 2nd remanufactured motor, the intall went smooth as uaual. I did not replace the SBT woodruff key account I did not have one on hand. I finally get this ski to the lake, and now the ski will only turn 4900 RPM's. After inspecting the motor and going threw all the hoops, I noticed that the 2nd SBT motor had the rear crank seal sticking out of the case like the 1st motor.
I have yet to pull the motor again, but I'm afraid that I might have sheered the key again. I did all the testing on the 2nd motor, and there was no apperent back fire. "NOTE" the Polaris flywheel was in good condition, the pto, driveline, and pump were also in good working condition with no apperent vibrations etc. All this was was cleaned, inspected on both motor installs.
My question is, has anyone had this type of problem? Does SBT have any suggestions on what might have happened? Did SBT rebuild the first motor that they shipped me? Could the problem be in the SBT crank.
Needless to say I have exhausted myself trying to get this ski back on the water for my customers. My customers have been without a ski since April. I am out countless numbers of hours working on this ski, not to mention driving 85 miles one way to do the testing on the water.
Can anyone help?
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