Yamaha 200 v6 2 stroke only runs on emergency mode

[tonydwood]

My yamaha 1992 v6 200 hp carby motor was running well until it melted No 5 piston. This was replaced and the tech said all was well. Next time out it ran erreatcly at the start, cutting out and restarting after some difficulty, but the running ok for about 40 minutes and then dying and not restarting. Changed to the emergency circuit and restared and ran ok back to port. reconnected the cpu and would not restart. back to emergency and runs ok.<br /><br />replaced the microprocessor with one from an engine that was runnig ok, but still would not run.<br /><br />Unlikely thet the cpu has failed, could it be the timing sensor? or what?

 

[swist]

Re: Yamaha 200 v6 2 stroke only runs on emergency mode

Sounds like one of the sensors (Or the wiring to them) is faulty.

 

[tonydwood]

Re: Yamaha 200 v6 2 stroke only runs on emergency mode

Thanks, we are looking at the sensors today and will hopefully isolate the problem. I will let you know.<br />tony

 

[rodbolt]

Re: Yamaha 200 v6 2 stroke only runs on emergency mode

hello<br /> carefully test the spark,trigger output and stator output. that year 200 did not have much in the way of sensors. also if its a saltwater engine check for corroded connectors inside the wiring harness.<br /> good luck and keep posting

 

[tonydwood]

Re: Yamaha 200 v6 2 stroke only runs on emergency mode

plenty of spark whenstator connected directly to coils, none when cpu connected. There is a fuel sensor, timing sensor and 4 temperature sensors.<br />the timing sensor is putting out 3.7 volts on the multimeter. any more ideas/<br />tony

 

[rodbolt]

Re: Yamaha 200 v6 2 stroke only runs on emergency mode

what timing sensor?<br /> if it is in fact a 92and is a 200 it should have a pair of temp sensors a movable timer and nothing else<br />I just went and looked at my 93 200. you either posted the wrong year or horse power.<br /> the 225 had a TPS and crank sensor in that year but the 200 did not until 96.<br /> good luck and double check your info

 

[tonydwood]

Re: Yamaha 200 v6 2 stroke only runs on emergency mode

Sorry rodbolt. I was told it was a 92, but it had no badges. it must be a 96 at least because those are the sensors going into the cpu. The model has an A line ( from the stator) and B line (that goes to the coils)that go via the cpu. the emergency mode is to join the a line to the b line, thus bypassing the cpu. hope this clarifys.<br /><br />what i assume is the timing sensor is a black box that sits outside the ring gear and has two blue wires leading to the cpu. this was showing 3.7 volts on the meter.<br /><br />we are no further ahead at the moment, but today s another day 9or night for you)<br />thanks again tony

 

[rodbolt]

Re: Yamaha 200 v6 2 stroke only runs on emergency mode

how many fuel pumps are on the port side of the engine? what color are the wires coming from the TPS on the upper port side of the top carb? how many carbs?<br /> and do the t-stats mount in the head or on top of the block?<br /> good luck and keep posting

 

[tonydwood]

Re: Yamaha 200 v6 2 stroke only runs on emergency mode

The boats in at the shop at the moment, but i can answer some. The port carb sensor has three wires, red black and white. there are three carbs. all of the thermoststs fit into the head.<br />thanks tony. In frustration they are fitting yet another second hand micreprocessor so i will let you know what happens. If all fails the motor runs ok without the cpu and sensors.

 

[rodbolt]

Re: Yamaha 200 v6 2 stroke only runs on emergency mode

no its not<br /> I think you have a v6 excell or a 225.<br /> the P200 started using a TPS in 94 or so. but without a model number and looking at it its hard for me to tell. the crank sensor is the black box you are refering to. it gives the CPU information on engine RPM. I cant remember when the proV 200 started using the CPS but the 225 always did or at least since about 89.<br /> good luck and try to describe the sensors and wire colors and maybe we can narrow it down the trouble shoot it.

 

[Ray Neudecker]

Re: Yamaha 200 v6 2 stroke only runs on emergency mode

The 86 220 and the 87 on 225 had a similar setup as described. Is the motor a vertical or horizantal front half? The most common cause for this was the crankcase sensor being out of line or defective on those engines.

 

[tonydwood]

Re: Yamaha 200 v6 2 stroke only runs on emergency mode

I can take some digital photos of the setup if that helps. if so how is the best way to send them? tony

 

[rodbolt]

Re: Yamaha 200 v6 2 stroke only runs on emergency mode

hello<br /> if you can post them here. if not try rodbolt40@yahoo.com and hope I remember to check it

 

[tonydwood]

Re: Yamaha 200 v6 2 stroke only runs on emergency mode

rodbolt, i do not have an internet posting for the images at this point, so i have emailed them to you at yahoo tony

 

[rodbolt]

Re: Yamaha 200 v6 2 stroke only runs on emergency mode

hello<br /> that is a pic of a ECU that was used on the 220 excel and the 225. give me a pic of the fuel pumps.<br /> but I really dont think an ECU will fix it.

 

[tonydwood]

Re: Yamaha 200 v6 2 stroke only runs on emergency mode

Rodbolt, I now have the boat back home and the saga continues. After a week at the yamaha dealers they are stumped and the problem remains as before. their only suggestion is to run it without the ecu. I have sent you a couple more pic to yahoo. Additional info is that there are two fuel pumps on the port side. The only number on the engine is 010128, stamped on a welsh plug. The front carby cowl says 2596 cubic m as capacity. The good thing is that they wouldnt charge me for their time.

 

[rodbolt]

Re: Yamaha 200 v6 2 stroke only runs on emergency mode

hello<br /> it looks like the powerhead from an excell or prov. if it wont spark with the emergency a-b leads hooked up and you have retested with a known good ECU and the TPS is known good then unwrap the black tape from the main harness and find the bad splice for the yellow wire. the engine when hooked a-b uses the pulser coils and has fixed timing. the ecu is no longer controling the ignition. I suspect you lost an input to the ecu due to a corroded splice in the main harness. you really need to find some techs that dont specialize in parts swapping.<br /> good luck and keep posting

 

[Ray Neudecker]

Re: Yamaha 200 v6 2 stroke only runs on emergency mode

Rodbolt is right on if the crank sensor tests good. I have a pile of those Ecus since they very seldom fail. You can replace the stator and control arm to make the timing mechanical and bypass the Ecu also. Check the crank sensor to be sure the flywheel is not moving due to a worn top main bearing and hitting the sensor. If wear marks show on the sensor, you need to replace it and the top main bearing. This has been the most common cause of this problem in my experience. Corrosion in the harness at that age is also a high possibility.

 

[tonydwood]

Re: Yamaha 200 v6 2 stroke only runs on emergency mode

The flywheel seems sound and there is no movement. there are no scratch marks on the sensor. one yellow wire comes out of the cpu and splits to two with a connector. this is sound. one yellow then goes foward to the ingition switch control. the other is bundled with the wires going to the solenoids.light blue to the motor up solenoid, red from the main board to the starter solenoid, brown to the positive side of the starter solenoid, green to the down solenoid, dark blue to the choke, black to no where as it is cut off and dangling and yellow to no where as it ends in a connector that does look corroded, but i cannot see a corresponding bit of yellow anywhere.

 

[tonydwood]

Re: Yamaha 200 v6 2 stroke only runs on emergency mode

ps the yellow wire that goes foward to the throtttle control goes to the alarm buzzer and splits to the engine gauges. there is no corrosion in the controller and all connections are good. tony