rebuild

[blackiron]

i have a 90hp 1985 yamaha. bad piston cylinders are good is this engine worth rebuilding if i do the work myself.luv this engine had it for years and years great on fuel hate to let it go.

 

[noelm]

Re: rebuild

I guess the simple answer is yes, if you can get the parts easy enough, are confident to do the work correctly, and more importantly, if you find out why the pistons stuffed up so it does not happen again!

 

[James R]

Re: rebuild

I rebuild motors all the time. It is certainly possible to do it yourself and if you do it properly is far less expensive than having a dealer do it or buying a new motor. What you have to consider is are parts still available, especially pistons. What is it likely to cost, parts, boring etc. Do you have the tools, equipment and ability. Do you have a good manual. Seloc or Clymer are good but all the information is not always there. You have to figure somethings out yourself. If you have little experience this can be a problem.
Finally, would it be less expensive to find another motor and sell the one you have.

 

[cousinabe]

Re: rebuild

all the parts for that motor (90ELTK) are available on www.boats.net

http://www.boats.net/parts/search/Yamaha/Outboard/1985/90ETLK/parts.html

 

[blackiron]

Re: rebuild

i have a 90hp 1985 yamaha. bad piston cylinders are good is this engine worth rebuilding if i do the work myself.luv this engine had it for years and years great on fuel hate to let it go.

i guess my question should have been i can buy a powerhead for 2000.00 is it still worth rebuilding what i have.

 

[Yamajoe]

Re: rebuild

If you can do the your self and you heed the advise provided you will come in well below the cost of a recon powerhead; good way to know your motor too.

 

[rodbolt]

Re: rebuild

having rebuilt more of these engines than I care to remember your answer is yes.
but first a COMPLETE tear down and careful inspection is in order.
is the block and exhast corroded badly? is the divider plate,if used, corroded?
is the cylinder head corroded?
freshwater guys have no clue what corrosion can mean
why did a piston fail to start with?
if the block/head is ok then have a COMPETENT shop bore and PROPERLY chamfer the ports.
have a facility ,I use Ackermann marine in Wilmington NC, carefully insp-ect and recondition the crank and rod assy.
reassemble using all new seals,gaskets,fuel pump,water pump,tstat pressure control grommet and any other soft parts on the engine.
if properly reconditioned it will give mny years of service if properly maintained.
forget the maint and piston failure is inevitable, again.
if your not comfortable inside the block consider a reman power head.
a crank is usually less than 400 from Ackermann and Ron's marine in Portsmouth VA does my boring, usually less than 200 and its finish honed and chamfered when I get it back.
pistons with rings,pins,pin bearings and retainers are about 100 a piece but from yamaha all must be ordered seperatly.
in this application forged pistons are more problem than they are worth and the machine shop MUST know what forged piston you are using to properly bore the clearence.
two biggest mistakes I see over and over and over is only half the job was done or the block had so much corrosion it should have been sold for 18 cents a pound.