17 August 2016, 10:30
Country: UK - England
Boat name: N/A
Length: under 3m
Engine: Mariner 10hp
Join Date: Jul 2016
Cold Start Problems, Perhaps Primer Issues? Mariner 10 hp
Now Iíve been having some Ďfuní with my new to me, mariner 10HP OB and Iíve got it in fairly decent shape, just needs fine tuning now.
Thanks to everyone for your help previously and to Samt for supplying me with some parts; you guys are awesome!
Having found the original cause of failure (dodgy gasket on the side of the powerhead), the OB has had bit of an overhaul including new impeller, gear oil, plugs and tiller / manual gear mechanism reinstated. I also ran a compression test (would have identified the original fault instantly) and am getting readings of about 90psi on each cylinder Ė actually pretty similar, should I be concerned?
Now the motor runs great (once running), however does struggle to get going from cold. Iíve been reading around and suspect the carb might not be priming adequately. I had stripped and re-built the carb and it all looked pretty clean with diaphragms, springs and bearings in great shape), but wanted to ask the forum what tests I could do to check? I had read somewhere that be pressing the blue button manually (replicating the choke), I should see a little squirt of fuel straight into the throat of the carb. Now Iím not getting this, so in a nut shell, is the motor not priming? If yes, I will strip and rebuild the priming mechanism.
Thanks again and look forward to hearing your thoughts.