Hi there,
Im Leo, 20 years old and currently looking into rebuilding the Engine mentioned above.
In the past I have rebuild a Force 70hp and an Evinrude 9.9, so I do have a little knowledge.
The reason for rebuilding it is that the Engine blew the bottom cylinder. Upon closer inspection I figured that it was rebuild before, as it has 0.30 oversize Wiseco pistons in it. To my luck the bore looks acceptable, a hone will do.
What makes me worry is the lower crankshaft journal though, as I can see and feel one bigger, pitted area with my fingernail. The second picture is after a few minutes of polishing with 400 grit and WD 40.
Now the question is, if there are undersize bearings available or if it is still okay to use after some more polishing.
The Motor is going to be run on a little 4m runabout for wakeboarding. The main intention is to get a bulletproof motor that
can run under load for a while.
Im thinking about raising the compression a little and to go composite reeds for a little more grunt, but reliability comes first. To achieve that goal I would really appreciate the opinion of the experts on here. Would you run it with this crank?
Thanks in advance, I will try to take as many pictures as possible
Im Leo, 20 years old and currently looking into rebuilding the Engine mentioned above.
In the past I have rebuild a Force 70hp and an Evinrude 9.9, so I do have a little knowledge.
The reason for rebuilding it is that the Engine blew the bottom cylinder. Upon closer inspection I figured that it was rebuild before, as it has 0.30 oversize Wiseco pistons in it. To my luck the bore looks acceptable, a hone will do.
What makes me worry is the lower crankshaft journal though, as I can see and feel one bigger, pitted area with my fingernail. The second picture is after a few minutes of polishing with 400 grit and WD 40.
Now the question is, if there are undersize bearings available or if it is still okay to use after some more polishing.
The Motor is going to be run on a little 4m runabout for wakeboarding. The main intention is to get a bulletproof motor that
can run under load for a while.
Im thinking about raising the compression a little and to go composite reeds for a little more grunt, but reliability comes first. To achieve that goal I would really appreciate the opinion of the experts on here. Would you run it with this crank?
Thanks in advance, I will try to take as many pictures as possible