Question about Coleman Powermate Premium Plus 6250W Portable Generator

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10 HP B&S motor coleman 5000W generator. No compression appears to be stuck valve. How do i repair?

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First remove gas tank and the carb then remove the front air cover flywheel side then remove the head bolts and remove the head turn the engine by hand make sure it is indeed stuck and not bent.
on the crab side there will be a plate with 2 screws and a rubber tube remove this there will be a mesh filter under it this will give access to the valve springs and the clip to remove them take a pair of pliers and slide under the valve spring and push handle down this will force the spring up allowing access to the keeper pin remove it with a pair of needle nose pliers.
relax the spring tension slide the valve out and make note as to how the spring parts go together do both valves look at the valve as well as the seat in the block for a black burn marks on the mating surface this will tell you it there burnt replace valve if burnt or bent get some lapping compound from napa auto and run some on the valve edge part that mates to the seat in the block.
with a valve seating tool attach the suction cup to the valve top and insert to the block and rub the tool between your hands applying some pressure this is called lapping the seats.
remove the valve and clean off the lapping compound good
place the bad and good valve on a flat surface as long as the bad one is not bent check the height if the ned one is a bit longer you can grind off the top some small end just to get close if looks ok no worries leave it alone then assemble the parts in reverse replacing the gaskets you need change the oil and fire it up that's how you preform a valve job if the valves are good then you need to replace the rings or piston but even with them bad you should have some compression so chances are it is a bad valve rings will require a complete tear down contact a small engine repair for the torque settings for the head bolts for the engine you have. hope this helps

Posted on Aug 31, 2010

  • Fuchssrmark Jul 19, 2011

    I'm not sure if I have the same problem but I have a Coleman generator that when you pull the rope it goes about half then the compression is so hard it stops pulling. Now if you take the plug out it will pull with no problem. Any help would be appreciated.


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I have a coleman Powerbase 5000w with B&S 10 HP and has no spark after first run. It sits for a year I start it runs for 10 minutes, I turn it off and move it to friends house and can't get it to restart??

Posted on Aug 29, 2011

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