Problems with 50hp force

[fourbarrel75]

I have a 1986 50hp force, with a problem in the<br />lower unit. The porp is not spinning enough to<br />move the boat through the water.I thought maybe<br />I needed a knew prop. I bought one and I still have the same problem. The engine runs fine, but you you have to really open up the throttle just to get the boat to move. Any suggestions?

 

[WillyBWright]

Re: Problems with 50hp force

I'm betting you're not running on both cylinders. Pull the sparkplugs and take a look how they're burning. They should have dark brown deposits. Black means it's running too rich, clean means it's not firing on that cylinder.

 

[fourbarrel75]

Re: Problems with 50hp force

The engine is running fine. both sides are firing<br />both sides have good compression. My problem is <br />in the lower unit.The propeller isn't turniing as it should.This just recently started.I don't know<br />anything about lower units but I'm thinking maybe<br />bearings or something of that nature. It shifts<br />into gear fine and while its in gear you can't turn the propeller by hand, but when its in the water the propeller dosen't turn at full force.

 

[roscoe]

Re: Problems with 50hp force

Did you buy a "new" prop? or a used prop?<br /><br />Lots of props with spun hubs for sale on ebay. Even some new props have defective hubs.<br /><br />Take the prop of and scribe or draw a line from the hub to the housing. Take it for a test ride and then remove the prop and check the line. If it is still lined up, prop should be ok. If not, then the hub is spun.<br /><br />How fast will the boat go? 2mph, 10mph?<br />Any unusual noises coming from the lower unit?<br /><br />Is the exhaust snout still in place on the motor?<br />It is located directly above the prop and directs the exhaust away from the prop to prevent ventilating. It wouldn't be the first one to fall of, or be stolen.