The 1982 gearcase with the .53 ratio.....does it have a part # ....tell by looking..or do you have to spin it over to find the ratio?
Far as I know the pin drive was last made for a 31.8 in in 84 & on the 25's not 35's, the thru hub[s] I think were always on the 35's. However the 31.8 powerheads as far as I have seen will all interchange at the block/tower location. Your '82 is a 31.8 The # I found on the water jacket of the head I pictured is: 327673 D2 I
1
Its a raised #, not stamped & I coudn't find anything on the actual head. [under the jacket?] That head or not? perhaps you could tell thru thr spark plug hole?.
BRP Parts cataloge has expandable exploded views, you could ID the type for sure. As for ratio, spin the propshaft once & count flywheel spins is the best bet. From what Ive read the gearcase difference is more about aquadynamics than ratio since prop choice can improvise to some extent ratio difference. From what Ive read about the 2nd Effort case, stock parts of whatever years applicable are used in it.
This is what I started last year when we were talking about the 25/30/35 carb differences. This is nothing more than me writing down the numbers on 3 of the 31.8 motors I have. I do plan to add more columns for additional parts. If anyone is interested, I could add their motors and part numbers to this.
OMC 2cyl 31ci parts comparison.pdf
Jason
Outboard Junkie
Was there ever a carb with adjustable high speed jets?
You guys seem to be expert on this motor.
I have a 1993, 25 hp on my Lund fishing boat. To bump it up to 30 or 35 I've read to change the carb and the intake manifold. Is that it?
Tim
There are currently 2 users browsing this thread. (0 members and 2 guests)
Bookmarks