Its a fair point about the over heating. The tell tale was always less than impressive and after the overhaul is now much stronger. I noticed corrosion around the thermostat and now regret that i didn't change it.
Sorry to disappoint all you ultrasonic carb freaks but, dissembling the head a 2nd time and spending the $75 having it shaved improved the compression, not by much, bet enough to get her to run at low rpm. The head was slightly warped transversally so head gasket (between pistons my guess)...
What could be the electrical prob? Seems like timing is stuck in advance. I replaced 2 coils and solenoid in the past. I do have a 2nd carb which i think i already tried...but ill try it one more time before i run out a buy an ultrasonic. At least she's running. Overhaul may have been...
Well she's bolted back together and started right up....but same problem. She dies at less than 4,000 rpm. Compression measures the same around 70. Not sure what else I can do. Plan to soak the carburetor one more time over night, but other than that its order a new 15hp outboard online and...
I did deglaze but knew nothing about the ridge. Besides that, there is a small tilt across the top of the valve side of the block at the center between the two pistons...maybe 1mm. (see photo). Could explain low compression? Or is the piston cylinder designed to be slightly higher so it will...
Ok piston rings replaced and new head gasket ready to install...not sure about setting the timing belt. I marked TBC on both timing gears during dissembly...how can I make sure I've got the two timing gears properly aligned?
Of course I don't have a lot of experience with the feeler gauge, but end gap and side gap seem well withing tolerances. Even bore dimension at top seems smaller diameter than manual calls for 2.14 instead of 2.16.
Rings and head gasket are ordered. I don't see cross hatching on the bores
difficult to photo bores...some discoloration and wear visible but no scratces. They are glazed. Rings are ordered and rebore is not practical. Plan is to slap in rings (with or without hone) and reassemble. May be...
What about honing the piston bores? Look pretty clean to me. No scores only some discoloration at the top and the glazing the manual talks about. Afraid of scratching them if i try honing.
Test on the valves was blowimg into the ports...all air tight. Those little springs look look a ***** to compress to relese the valve stem...would like to do a "back yard" valve job with a little valve polish and an electric drill but worried about getting it all back together. Springs no...
well, I ran the compression test with throttle wide open...maybe an improvement of 5psi to 75psi on each cylinder. So I pulled the power unit and its sitting on my work bench. I will order a set of rings and a head gasket working on the presumption the rings are warn. I did test the rocker...
Thank you for your reply. It is a 4-stroke. I've done the compression test twice once with the engine cold (70psi) and once warm (60psi). I admit I did forget to open the throttle. Checking valve clearance was my next move. It may be a bit difficult because motor is still mounted on the...
