1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

[gica]

I guess I can give it a try.
Any idea if the broken piece on mine can be reattached and if so what is the best way. Don't know if you can tig it.

 

[Nordin]

No the broken piece can not be attached in a proper way.
It has to be pretty accurate line up for the pivot pin.
Otherwise the float and inlet needle will stuck or the needle will not close properly.
Maybe JB Weld or other chemical metal can be used to glue it back, but for how long will it last as it sits in fuel all the time.

 

[gica]

Yeah I thought so.
I am not too worried about the needle closing properly as it is pushed in by a tab on the float. But the manner in which it canbe safely attached is another story.

 

[racerone]

Post the actual size of the part that broke off.----Is it 0.200" X 0.200" ?------Then drill and tap the carburetor for a proper size screw.-------Drill a hole in the screw for the pin.------Screw can be bent and adjusted to line up the pin hole.-----Nothing to it !

 

[gica]

Here is the piece. I don't think one bolt is enough. It holds the float. No real strength needed but some is good.

 

[dog22]

Ok so after honing I measured tye end gap on all 4 cylinders and 1,3 and 4 have .016 throughout while the one I had to hone deeper is .035. So .019 difference in gap
#2 measures 3.3820 now.
Otherones at 3.375 now

I think you are going to be ok with those ring gaps I did a very fast rebuild on my 2003 mercury 125 3 years ago and I only put in new piston rings on the motor and a used standard piston from ebay for cyl2 which was blown and the motor is still running strong to this day without problems my piston ring gaps after honing all the cylinders were cyl1 0.31 cyl2 0.49 cyl3 0.36 cyl4 0.29 and the compresion after the rebuild was cyl1 135psi cyl2 125psi cyl3 135psi cyl4 138psi as you can see they are within less than 15 psi difference on all the cyl just put some new rings on those pistons and run it hard you do not want to spend that amaunt of money on an absolite motor

 

[gica]

I think you are going to be ok with those ring gaps I did a very fast rebuild on my 2003 mercury 125 3 years ago and I only put in new piston rings on the motor and a used standard piston from ebay for cyl2 which was blown and the motor is still running strong to this day without problems my piston ring gaps after honing all the cylinders were cyl1 0.31 cyl2 0.49 cyl3 0.36 cyl4 0.29 and the compresion after the rebuild was cyl1 135psi cyl2 125psi cyl3 135psi cyl4 138psi as you can see they are within less than 15 psi difference on all the cyl just put some new rings on those pistons and run it hard you do not want to spend that amaunt of money on an absolite motor

Thanks but this has been fully rebuilt, machine shop, new pistons, rings all .20 oversized. I am at the broken carb tab, studder when running, bought another flywheel for good measure. When I took the old one off I heat it up and had to hammer it, so I don't know if the magnets were affected in any way to cause the hesitation when running. Am exploring possibilities so I can get this damn thing on water already. All my friends are making fun of me hahaha we celebrated a year since I bought it last year, without actually fishing from it.
Thanks guys