First problem - electrical in ignition. Second - gas engines race when they lean out, then die. This was a great feature in little pit bikes with centrifugal clutches - an unexpected launch before running out of fuel. Could be a fuel supply issue.
Sent from my iPhone > On Jun 13, 2023, at 1:18 PM, Sylvain Laplante via CnC-List > <cnc-list@cnc-list.com> wrote: > > > Atomic 4 are really reliable and need very little to run ( good spark, > compression and almost any gas ). > A sudden stop will typically have one of two causes, water in fuel or > ignition coil ( overheating or short-circuit ). > For water try adding 8 ounces of gas line antifreeze ( methyl hydrate > available at most hardware stores ). A good RACOR fuel filter with 10 microns > will prevent that. > For the coil, try waiting 15-20 minutes so it cool off and restart, if not > well you have a spare coil on the boat right? > > For the slippage, maybe some kind of cavitation. If it happens with reverse > make sure you are only using straight 30-grade oil or motorcycle oil ( I've > been using 10w40 Castrol motorcycle oil for the last 26 years. Modern oils > have way too much antifriction additives and lack the famous ZDDP that used > to be added to protect engines. > Don Moyer made a good video on youtube to help troubleshoot sudden engine > powerdown. > > Sylvain > C&C27MkIII > > > On Tuesday, June 13, 2023 at 01:43:08 AM EDT, Karl Kuzis via CnC-List > <cnc-list@cnc-list.com> wrote: > > > Since we are on stories of oddness I have 2. > > First, when cruising along at modest rpm, will have a sudden shut down. Just > off. No change in sound, smell, rpm, etc just as if ignition switch cut out. > Suspecting a loose connection I proofed all wires / connections and we'll > test it out cruising around next week. Any odd ideas to keep in mind? > > Second, episodically when motoring at higher rpm close to hull speed will > have a sudden racing of the engine with loss of power. Pull back throttle, > and goes back to normal but not unusual to reoccur. Haven't noticed it at > lower speed or rpm. > I'm suspicious of cavitation but haven't thought it thru as to causes, tests > of theory, remedies or other options. Thoughts? > > C&C 29 Mark 1 with a recently rebuilt Atomic 4 and 2 bade folding prop. > > Karl Kuzis > Firefly > C&C Mk1 > karl.ku...@gmail.com > > On Tue, Jun 13, 2023, 3:18 AM Korbey Hunt via CnC-List > <cnc-list@cnc-list.com> wrote: > Scary stuff. Frustrating when "professionals" muck things up. > > > Get Outlook for Android > From: Todd Williams via CnC-List <cnc-list@cnc-list.com> > Sent: Monday, June 12, 2023 6:40:52 PM > To: Stus-List <cnc-list@cnc-list.com> > Cc: Todd Williams <trwilli...@gmail.com> > Subject: Stus-List Re: Engine strangeness > > Jon and others, > > Until two years ago, my boat also used to stall in idle when approaching > docks. Then, midway across Lake Ontario from Cape Vincent to Sodus on a calm > day the fresh water pump/antifreeze circulator seized up. There was melting > belt rubber with smoke as the bearings stopped turning. Five days and $56 > later I had a new antifreeze circulator in place and we haven’t stalled out > since. The friction in the bearings were enough to strain the engine into a > stall. > > TODD > > On Mon, Jun 12, 2023 at 7:26 PM JP Mail via CnC-List <cnc-list@cnc-list.com> > wrote: > Previous boat > ‘79 Nicholson 303 > Yanmar 2qm15 > 320 hrs. > > Starts and runs all day. Slowing while approaching a dock-stalls. > Change filters, check for loose fuel lines, change crush washers….. > Approaching a dock….stall. Always while slowing down. > Approaching the fuel dock at Dodson’s was told “I’m going there!” By the nice > man on his Hinckley. My response, “Sorry,(engine stalls) I am. > The fuel pickup was at the forward end of the cylindrical tank. When I > slowed, all the crud would slosh forward and block the pickup causing a > stall. > Unfortunately the yard cleaned the tank and replaced it. they also > inadvertently punctured it and diesel would run out the bottom. Found this > out after a day sailing. Back to the yard and a new tank was installed. > Unfortunately they inadvertently severed the propane line while cutting a 2” > hole in a bulkhead to run a new vent line. It was obscured by the insulation. > Found this out when it blew up. With 2 of us onboard. ‘Nother story. I’m sure > I told it here at some point. > Jon Pratt > Hideaway 35-3 > Stamford CT > Sent from my iPhone > Please show your appreciation for this list and the Photo Album site and help > me pay the associated bills. Make a contribution at: > https://www.paypal.me/stumurray > Thanks for your help. > Stu > Please show your appreciation for this list and the Photo Album site and help > me pay the associated bills. Make a contribution at: > https://www.paypal.me/stumurray > Thanks for your help. > Stu > Please show your appreciation for this list and the Photo Album site and help > me pay the associated bills. Make a contribution at: > https://www.paypal.me/stumurray > Thanks for your help. > Stu > Please show your appreciation for this list and the Photo Album site and help > me pay the associated bills. Make a contribution at: > https://www.paypal.me/stumurray > Thanks for your help. > Stu
Please show your appreciation for this list and the Photo Album site and help me pay the associated bills. Make a contribution at: https://www.paypal.me/stumurray Thanks for your help. Stu
