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Yamaha 200xb making oil...

Old 04-10-2019, 05:53 PM
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Default Yamaha 200xb making oil...

Hello,
I have a 2016 yamaha 200xb bolted to a 2016 Parker 2100dv. Had the boat for about 2 years, has approx 260 hours on it, without any issues at all. The other day I went to change the oil and when I pulled dipstick it was about 4-5" high, nice and clear and had a strong gas smell. Convinced myself to go ahead and change oil and finish out the service because I had a trip planned next day. Left the oil about 3/4 in between low and high marks. Went fishing, put about 6 hours and 100 miles on boat. Ran the piss out of it for first 25 miles, 5500rpm for about 45 mins. Get boat back on trailer and home, check oil and its 3 or 4" high again and smells like gas. I always allow my boat to warm up. Ive used ring free plus in ethanol free fuel since new and its not overpropped like some would suggest, throttle pegged i can hit 6100 rpm without getting crazy with trim. Doesnt run rough, idles fine, no drop in power all the way up, and according to the guages its running at normal operating temperature. Based on how much "oil" was drained it accumulated about 2 quarts of fuel in 6 hours. If anyone has any information on this please shed some light, I know its somewhat of a known issue for yamaha 4 strokes to make oil, but from what ive seen i dont meet any of the same criteria. Im not low hours/just out of break in, in the last 250 hours ive not had a single problem making oil. Im not overpropped. I dont baby my boat. Im getting a lot more fuel in crankcase and faster than most that ive read about.

I know that was lengthy but I wanted to include as much amplifying info as possible. Any help is appreciated.
Old 04-10-2019, 06:39 PM
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Default 200xb

I would look at the injectors, one or more might be over fueling.
Old 04-10-2019, 06:46 PM
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I thought that, however would i not have a rough idle if that were the case? Either way its going into shop, still under warranty. Just worried that i wont get it back for a while... Tog is just now starting to turn on and everything else to follow. The thought of it being down for a month or more is a real bummer.
Old 04-11-2019, 11:29 AM
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Originally Posted by wstanford277 View Post
I would look at the injectors, one or more might be over fueling.
agreed for first place to look. No wouldn't be running rough.
Old 04-11-2019, 11:39 AM
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I've got a VMAX 250 with 135 hours and it's making oil still. The prop supplied with the boay was wrong and I was only turning about 5200 rpm since it was new. Mfg. just sent me a new prop to runand fix the rpm problem.
Could the low rpm been the cause of oil problem?
If new prop gets me up to the 6k region, do you think the making oil problem will go away?
Like Chitbleux, I use ring guard.
What gives?
Any help would be appreciated.
Old 04-11-2019, 12:12 PM
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Default Making oil

Search Yamaha 300 making oil. Lots of information, your 250 block is the same as a 300.
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Old 04-11-2019, 12:15 PM
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Most likely a stuck thermostat or small chance injector
Old 04-11-2019, 01:01 PM
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That is quite a bit getting in the crankcase - hard to imagine that much fuel washing past the rings in 6 hours....I'm thinking you have a leaking LP fuel pump.
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Old 04-11-2019, 01:04 PM
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Originally Posted by Heyeddie View Post
I've got a VMAX 250 with 135 hours and it's making oil still. The prop supplied with the boay was wrong and I was only turning about 5200 rpm since it was new. Mfg. just sent me a new prop to runand fix the rpm problem.
Could the low rpm been the cause of oil problem?
If new prop gets me up to the 6k region, do you think the making oil problem will go away?
Like Chitbleux, I use ring guard.
What gives?
Any help would be appreciated.
Overpropping and patty caking the throttle is the source of all oil making problems. Get it propped right and ride the hair off of it for a few tanks of fuel, and quit using synthetic oil if you are.
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Old 04-11-2019, 01:08 PM
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In order of most likely

1) carbon build up on the rings and you’re getting blow by
2) stuck thermostat
3) pin hole in the diaphragm on the lift pump.
Old 04-11-2019, 01:08 PM
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Patty Caking?
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Old 04-11-2019, 03:51 PM
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Originally Posted by fowlhook View Post
In order of most likely

1) carbon build up on the rings and you’re getting blow by
2) stuck thermostat
3) pin hole in the diaphragm on the lift pump.
Tell us more about the pin hole in the diaphragm on the lift pump please.
Old 04-11-2019, 04:07 PM
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Originally Posted by Heyeddie View Post
Patty Caking?
Glad handling

Babying

Observing the factory break in procedure
Old 04-11-2019, 04:25 PM
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i generally followed the break in.......I noticed that the boat was idled by the marina staff to consume some of the break in time before I took ownership.......maybe this is part of the cause???
I pushed her good......wot's often after the break in..........I like fast. no babying here.

Bottom line: I'm At 135 hours: Going forward, can this be fixed?
It's pissing me off.
Any further suggestions would be appreciated.
Thanks
Ed
Old 04-11-2019, 04:46 PM
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Sounds like to much for blowby. Fuel pump would be my guess also
Old 04-11-2019, 05:17 PM
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Last Yamaha for me. I can't stand hearing these reports.

OP wish you the best of luck.
Old 04-11-2019, 06:43 PM
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Originally Posted by Heyeddie View Post
i generally followed the break in.......I noticed that the boat was idled by the marina staff to consume some of the break in time before I took ownership.......maybe this is part of the cause???
I pushed her good......wot's often after the break in..........I like fast. no babying here.

Bottom line: I'm At 135 hours: Going forward, can this be fixed?
It's pissing me off.
Any further suggestions would be appreciated.
Thanks
Ed
Any babbit bearing piston engine should be broken in the same - warm it and then beau coop repeated accelerations with increasingly longer periods at high revs. The "break in period" that matters is from first start to 1 - 2 hours with idling being the worst thing you can do. Sorry but what your motor got was absolutely babying. Our cars don't suffer from this as they run at 200F+ vs 143 in your outboard. Much easier to expand and seat rings at the higher temp

Can it be fixed? Maybe...prop it to the top of the RPM range and be mean to it for a while. Good luck
Old 04-11-2019, 06:52 PM
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Originally Posted by Jeepman View Post
Sounds like to much for blowby. Fuel pump would be my guess also
How is the fuel from the fuel pump getting into the crank case?
Old 04-11-2019, 06:52 PM
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Originally Posted by HTJ View Post
Any babbit bearing piston engine should be broken in the same - warm it and then beau coop repeated accelerations with increasingly longer periods at high revs. The "break in period" that matters is from first start to 1 - 2 hours with idling being the worst thing you can do. Sorry but what your motor got was absolutely babying. Our cars don't suffer from this as they run at 200F+ vs 143 in your outboard. Much easier to expand and seat rings at the higher temp

Can it be fixed? Maybe...prop it to the top of the RPM range and be mean to it for a while. Good luck
Which is what Yamaha specifies.
Old 04-11-2019, 07:05 PM
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If wide open throttle is 5500, then you are over propped and that's the problem. Get wot to close to 6000 and it won't happen any more.

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