2002 25 hp rebuild

Ad88

Cadet
Joined
Dec 25, 2011
Messages
28
Son ran it hot, lost compression on top piston set for 2 years, let a kid rebuild it with 2 new pistons and rings. Has spark and fuel can’t get it to crank even with starting fluid. Thanks for all input
 

airshot

Rear Admiral
Joined
Jul 22, 2008
Messages
4,083
Toss the starting fluid as it can damage the new cylinders/ pistons by stripping away the oil. Use WD40 or other spray petrol product
 

Ad88

Cadet
Joined
Dec 25, 2011
Messages
28
Switched plug wires and cranked immediately but would not stay running, going to rebuild carb
 

Ad88

Cadet
Joined
Dec 25, 2011
Messages
28
After further inspection going to purchase new carb, fuel filter an lp fuel pump.
 

airshot

Rear Admiral
Joined
Jul 22, 2008
Messages
4,083
After further inspection going to purchase new carb, fuel filter an lp fuel pump.
Even a new carb should be setup/ adjusted to specs for your motor, often they are setbup for a variety of different motors right out of the box..
 

Ad88

Cadet
Joined
Dec 25, 2011
Messages
28
Will do, The original carb set outside in weather for along time I've taken it off many times and cleaned but probably not sufficient. Lots off Dirt daubers in East Texas!
 

Ad88

Cadet
Joined
Dec 25, 2011
Messages
28
All new stuff on but still no crank. Found fuel leak at the bottom right of crank case. Bolts not torqued properly would be my guess.
My question is should there be a sealant used on the mating surfaces of the crank case. Any professional advice is appreciated. Thank you
 

Ad88

Cadet
Joined
Dec 25, 2011
Messages
28
When engine does try to start more fuel seeps out. Time to torque
 

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MattFL

Master Chief Petty Officer
Joined
Oct 20, 2010
Messages
819
You're going to need to disassemble to seal it correctly.
 

Ad88

Cadet
Joined
Dec 25, 2011
Messages
28
Tore down, cleaned it really well, lightly sanded with 1200 grit, used Anaerobic sealant and torqued the bolts. Letting it sit for 48 hrs. before I start to reassemble. Screwed up the alternator and exciter coils with the bolts from the flywheel ( dumb, dumb, dumb ). I will never gripe about what boat mechanics charge per hour again!!!!
 

MattFL

Master Chief Petty Officer
Joined
Oct 20, 2010
Messages
819
Great, hopefully it will work. Not knowing which sealant you used, I'm hopeful you chose one for engines that will be tolerant of gas and oil.
 

Ad88

Cadet
Joined
Dec 25, 2011
Messages
28
Permatex 51813 is the only Anaerobic one I could find at Auto part store. It said it's ideal for Crankcase applications and is solvent resistant. Crossing my fingers. Still have it sitting on bench curing. If anyone thinks this brand of sealant is not going to work let me know before it goes back in.
Thanks
 

Ad88

Cadet
Joined
Dec 25, 2011
Messages
28
All back together still no crank.
Only thing I can think of is the new excitor had on 1 red wire coming off and a black ground mounted into bolt hole. The old excitor had 2 wires
 
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