OX66: Alternative O2 Sensor?

[5-Salt]

RE: 1997 OX66 250HP

Looking for compatible O2 sensor from the automotive parts store for my 97 OX66 250hp.

I recall reading on a Yamaha motor forum about two years ago that an O2 Sensor for the OX66 crossed referenced to a somewhat common model used on Chevy or Ford auto motor. The auto parts version was less than half the price of the Yamaha unit and only required soldering the Yamaha connector to the auto unit.

I lost track of the web site and web search has netted zero results.

Any one help my attempt to replace the O2 sensor at a more reasonable cost?


Thanks

 

[kynolan2183]

Re: OX66: Alternative O2 Sensor?

I found a Bosch 15703 fit. I had to cut and solder the wires to fit the plugs but after that it worked just fine. the price was 59 usd plus tax.
I have not water tested it yet. I will install tonight and test on the hose. I will water test this weekend.
I was like you not wanting to pay 275 bucks for an O2 sensor.
Every O2 sensor does the same thing with the same voltage output. There are Wide band O2s out there now that give better readings. This Yamaha O2 sensor is a "Narrow" band one which is typical in the Auto world. The Wide Band is new.
Xpress x19 2002 with OX66 200hp Vmax

Kyle

 

[5-Salt]

Re: OX66: Alternative O2 Sensor?

Thanks Kyle.

Good stuff....

I wonder if there is any benefit in retrofitting a "wide band" O2 sendor for my 97 OX66?

Thanks - Cal

I found a Bosch 15703 fit. I had to cut and solder the wires to fit the plugs but after that it worked just fine. the price was 59 usd plus tax.
I have not water tested it yet. I will install tonight and test on the hose. I will water test this weekend.
I was like you not wanting to pay 275 bucks for an O2 sensor.
Every O2 sensor does the same thing with the same voltage output. There are Wide band O2s out there now that give better readings. This Yamaha O2 sensor is a "Narrow" band one which is typical in the Auto world. The Wide Band is new.
Xpress x19 2002 with OX66 200hp Vmax

Kyle

 

[kynolan2183]

Re: OX66: Alternative O2 Sensor?

Installation went ok but....

You will need to fit modify the black box because this sensor is wider. I cut the tube part off and widened the hole. Made a gasket out of gasket maker from autozone. The gasket maker stuff is a rubber and fiber material that you cut to fit.

Drive way test.
The motor ran great at idle once it ran out all of the richness. About five to ten minutes. The plugs looked good after running, wet but not over wet.

The o2 sensor part now sticking out of the black housing did get hot but not so hot that I could not touch it, I was able to keep my finger on it for 5 seconds. I then placed the rubber cover over it and watched for melting, None. I may wrap it with muffer wrap before it hits the water.

Total cost about 70 usd.

The O2 sensor seems to be doing it job now. The restarts are alot less smokey.

I will water test as soon as I can.

If this works then I can say good by to having to clean the sensor every year and just make replacing it part of the yearly service. If it doesn't and I blow my motor then I can just sit at home and look at the rebuild I have to do because I didn't want to spend the 300 usd for the Yamaha part.

 

[kynolan2183]

Re: OX66: Alternative O2 Sensor?

I would not put a wide band on it. I don't think the cpu would understand it. I also think the wide bands function different and cost more than the Yamaha sensor.

Kyle

 

[5-Salt]

Re: OX66: Alternative O2 Sensor?

Look forward to hearing about your water test

 

[rodbolt]

Re: OX66: Alternative O2 Sensor?

just remember, on the OX66 motors if the O2 sensor tells the ECU its rich the ECU can and will lean the mix above 4000 RPM to a point that detonates pistons from a lean burn.
you may wish to spend the time testing for proper O2 sensor voltage outputs first.

 

[kynolan2183]

Re: OX66: Alternative O2 Sensor?

This sensors operation range is 0 volts (off) to 1 volt.
When I ran it on the muffs it ran between .35 volts and .54 volts.
I don't have a tank to put it in to test it at WOT.

 

[kynolan2183]

Re: OX66: Alternative O2 Sensor?

Water test summary,,,,

Prep before putting it on the water.
I took a volt meter and wired it into the system so that I could watch the voltage as I ran the motor do to Rodbolt's statements.

Good news is the motor is still in on piece. Good news is the voltage bounced around between .3 and .8 during my many test runs (45 minutes of continual run time) . I wanted to take accurate readings for everyone but it is a little hard to do that at 60+ MPH. Good news is the motor did not have massive smoke clouds on restarts.


Now the Bad News... Yamaha can take their 305 dollar sensor and stuff it.

My total cost
59 for bosch sensor
7 dollars for gasket material
10 dollars for heat protective spark plug sock to go over the O2 sensor.

total cost 76 plus tax. And the only thing I have to rebuy next year is a new O2 sensor.
This was time well spent.

I can put together an O2 conversion kit for anyone for 200.00 if they need it, cash upfront

 

[kynolan2183]

Re: OX66: Alternative O2 Sensor?

Changed my Avitar because I sold the OZark and purchased a duel consol Xpress X19 with a moveable center consol.
I like the Center consol the best.

 

[rodbolt]

Re: OX66: Alternative O2 Sensor?

why buy a new one?
they are simple to clean and test just like the maint schedule says.

 

[kynolan2183]

Re: OX66: Alternative O2 Sensor?

RodBolt,

If it looks like it could be cleaned then of course I would clean it but I put alot of hours on a boat. We use to have a ski boat and a fishing rig. I upsized the fishing rig and sold the ski boat. Lake Greeson and Lake Ouchita are great for just running Wide Open and with a Teenagers skiing and tubing all summer long I can spend 100 a day in gas on the weekends from june through august. With yamaha saying clean every 100 hrs that tells me the two stroke mix running through this motor is going to dirty it up fairly fast. In car terms that is only 6000 miles. For my boat that is only a summer and a little bit. The only good part about living in Arkansaw is the fishing, (the hunting is poor because to many bubbas poach), thus I fish all year long. So from the schedule I calculated and have up on the shop wall. (I have a schedule for all of the mechanical stuff listed) I will need to
Replace the plugs every 3 months and clean the sensor every time.
Replace the gear oil at the start of summer and at the end.
Replace the O2 at the start of every summer.
Drain VST tank into jar and look for particles once a year. Replace fuel filter at engine once a year and drain when the plugs are changed, Replace fuel filter at gas tank once a year.

Maybe I am going over board but with the amount of mechanic junk I have to keep up with it, is better to just put it in as a prevent? (3 autos,1 boat, 2 four wheelers, exmark, and ect) Something needs a PM every week.

By the way thanks for your help on watching the voltage. I watched it in the driveway but after your comments I rigged up the volt meter for an on the water test. I have debated mounting a volt meter on the dash just to read the O2 sensor in operation.


Kyle

 

[rodbolt]

Re: OX66: Alternative O2 Sensor?

best I can tell you is make sure the cleaning solution does not get over top of the crimp on the sensor.
clean the draw tube.
make sure the O2 sensor cannot become contaminated and when testing hold a steady speed about 3000 RPM and the meter voltage should scale between about .3 and about .6V
gear case MUST be submerged when testing sensor output voltage.

 

[kynolan2183]

Re: OX66: Alternative O2 Sensor?

Rodbolt,

Then it did great. Do you know if the Yahama digital gauges could be setup to read the voltage from the o2 sensor if I ran the wires? I think that my gauges read the voltage from the battery which I don't need since my fish 'non-finder' can read the voltage.

It would be really good to be able to read it at a glance since a bad O2 really affects my fuel usage.

 

[cousinabe]

Re: OX66: Alternative O2 Sensor?

Changed my Avitar because I sold the OZark and purchased a duel consol Xpress X19 with a moveable center consol.
I like the Center consol the best.

Is that your fishing buddy in your avitar??

 

[kynolan2183]

Re: OX66: Alternative O2 Sensor?

Htca