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  1. M

    1987 Force 125 - Knocking Sound/90PSI

    Re: 1987 Force 125 - Knocking Sound/90PSI Still working on removing the exhaust cover. Two of the pistons have wear on the skirt, here is a pic of #4: The other one is similar, just not quite as bad. Replace them? How badly do the cylinders need to be scratched before they need to be bored...
  2. M

    1987 Force 125 - Knocking Sound/90PSI

    Re: 1987 Force 125 - Knocking Sound/90PSI I finished disassembling the crankshaft and pistons. The two Main Bearing Races between Cylinders 1&2 and 2&3 had some play in them. The third was tight. There are no thrust bearing on my motor, the Main Bearing Races ride directly on the block and...
  3. M

    1987 Force 125 - Knocking Sound/90PSI

    Re: 1987 Force 125 - Knocking Sound/90PSI First off, thanks for the replies guys - I appreciate it. To answer your question in regards to the flywheel - I knew that the motor would need to be disassembled to find/fix the problem, so we went ahead and did that. Found this on all 4 cylinders...
  4. M

    1987 Force 125 - Knocking Sound/90PSI

    I have a knocking sound coming from the motor and the compression on Cylinder 1 is 90psi(others are 135psi). History(Sorry it's long, I tried to be as thorough as possible): Before we went out yesterday I ran it on the hose - I noticed what I thought might have been a QUIET ticking noise. Not...
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