finaly got a marine mechanic

[jjdluz]

i have been mess with my 1992 yamaha 200 outboard pass 2-3 months,finaly got mechanic,tell u what he done,compression check-all good,spark check -all good,spark plugs check-all look normal,have fuel go to all six cylinder,cd box,good,timming good,and still unplug the #4 cylinder wont change running,he mess with carb and coil wire,cant find anything wrong,and said that cylinder go to be working,otherwise it will flood the cylinder,any idea what is wrong of my motor,or just nothing wrong with it,thanks for the help pass 2-3 months,

 

[rodbolt]

Re: finaly got a marine mechanic

ask your "marine mechanic" to produce certification of the completion of the yamaha fuel AND electrical courses.
better yet ask to see the official Yamaha website with his picture as a master tech.
then go find a real "marine Mechanic".
cause if it takes more than 30 minutes or so to diagnose a problem with the ign system on a carbed 200 someone aint up to speed and is usually a pokin and a hopeing.
I hope your not paying more than about 12 dollars an hour to the tech
thats about what a yard hand gets.

 

[JustJason]

Re: finaly got a marine mechanic

I agree... unless you have a part that works when it's cold and not when it's hot it should only take about 1/2 an hour to find it..... If it's a part that's crapping out only when hot then it's more like 1 1/2 hours (max... although there's always exceptions.)

He may be getting spark to the plug.... But how is he verifying the plug itself is firing?

 

[Capt Ken]

Re: finaly got a marine mechanic

I've probably missed something here, but why do you think the cylinder isn't firing? You can have cylinders that when you pull the plug wire, its hard to tell a difference. Is it losing power or cutting out badly when powering up? Best way to tell if a cylinder is firing is after it warms up, use a lazer gun to check the temp on the base of the sparkplug. If its the same temp as the others, its firing, if its not firing, it will be cooler than the others.

I'm sorry Rodbolt, a picture on the website doesn't make a mechanic. I've seen too many of them come out of the school still idiots.

 

[rodbolt]

Re: finaly got a marine mechanic

trust me, the Yanaha master tech program is rather difficult, however I too have seen folks go to school and thats about it.
with test wheell part #YB1626 and a CD77 almost any ign problem ,especially on the 92 200, can be quickly found or the system eliminated.
but any school is better than no school. especially on EFI and HPDI and the larger yamaha 4 strokes with variable cam timing.
myself, with a test wheel,Kv tester and my trusty peak reading meter I can quicly eliminate or confirm ign as the source or not.
I guess I spent to much time this week working behind some of the local mobile mechanics. the guys with a van working out of the garage with no thoughts to USCG compliance nor whether its actually done right. not long ago I worked behind one that had rebuilt the carbs,replaced the ECU and it still would not run. blown piston on #5 was the problem the entire time.
so dont get me wrong, but it irritates the crap out of me to see someone fork over their hard earned cash to a tech that is charging top dollar but cant troubleshoot a simple ADI ign system with a simple fuel induction system.
but I see it weekly here. those guys bill 35 an hour and most professional places bill 80 or so.

 

[JustJason]

Re: finaly got a marine mechanic

rodbolt.... I use both an old Fluke 8... and a new fluke 88V. I have a blue point dva adaptor as well as a rapair one. I use a shelton labs tach/kv meter. I have steven's spark boards... But what is the test wheel you refer to? I dunno what that one is. Thanks
Jason

 

[jjdluz]

Re: finaly got a marine mechanic

answer capt jason question,he did check the plug have spark go to cylinder,and i ask him the spark strong enough,he said yes,and that is what i gonna do next,use laser temp gun check temp of spark plug after it run till it get to operation temp,thanks for all the tips,welcome for more tips,thanks.

 

[rodbolt]

Re: finaly got a marine mechanic

the test wheel replaces the propeller. then you back it down the ramp ,warm the engine up and you can run full throttle, in the above 1992 200 HP with test wheel YB1626 yamaha says that engine should spin at 5350-5500 RPM. if it wont its broke if it will its a hull/prop problem. it allows testing the engine with a known load at any RPM you wish. if the CDI output remains steady,the secondary Kv remains steady then its fuel or mechanical. dosnt take rocket science.
thats why quite often I prefer my analog peak reading over digital.
the analog will catch momentary failures faster than digital because its not buffered.
if you suspect a crossfire,rare in yamaha but can happen, simply index the flywheel with a magic marker and ee if any other numbers show up with a timing light.
like I say, its not rocket science but it does require a firm knowledge of the system being worked with and a trouble shooting plan.
doesnt hurt that I spent 6 years as an FC in the USN if you think DFI is complex try a CIWS or Harpoon system .