2 Stroke Oil Flood

[kev1tzr]

Hi Everyone,

New to the forum and hoping to get some advice?
I am rebuilding a 2004 Yamaha TZR, AM6, frame up resto.
all has gone well, considering I am not actually qualified for the job
regarding the engine, it wasn't in bad shape at all but I replaced the piston and rings and it ran great after that.
once I noticed the Oil pump was leaking, I replaced that too, but received a faulty unit that kept letting 2 stroke through even while the engine was off...

as a result, 2 stroke oil flooded the carb, through the intake reeds, flooded the con rod compartment, through the cylinder and into the exhaust. oil pump replaced again with working one.

I siphoned a lot of oil out of the con rod section, accessed via the reed valve intake, poured out a lot of oil from the exhaust and once I finally got it to fire again it spat oil out of the cylinder outlet (exhaust was off at this stage)

now its back together and starting fine but makes huge amounts of smoke, assuming from the oil left over that I couldn't get out without stripping the whole engine again. and possible residual oil in the exhaust.
only change to the carb was reverting back to a stock idle jet (30) from the 32 that was in there when I opened it up.
the bike is stock in all regards, 50cc stock head, piston, rings, carb, exhaust etc.

My question is, should I just let this burn off over time by running the bike or will it damage the engine?
I have run it for 30 minutes and the smoke reduced quite a bit but still smokes way more than it should.

thanks in advance everyone!

[Zino]

The good news you got enough oil out so she will fire and run .

So Burn the oil out .

When you rebuild with assembly lube she smokes for a bit because the inside of the cylinder and piston and bearing is dripping with oil .

It really should clean up after a couple of miles

[kev1tzr]

Zino -

Thanks for the validation, so glad i don't have to rebuild

[Lucass2T]

Yes the oil won't do any harm. Just run it, it will disappear after 10mns.

[aeroxbud]

Yes don't you hate it when that happens.

My oil pump died and did the same. And the aftermarket one, so I went premix.

[Zino]

Wow
The horizontal minnies never fill like that

[kev1tzr]

Sorry to see that it happened to you too, but on the other hand at least I know it's not a unique issue.

I've started and run it for 30 to 40 minutes at a time (idle and some light revs), it's still smoking huge amounts.

Would it be better to run it under load and higher revs to clear it out?
A longer ride in other words?

[aeroxbud]

Yes you probably need to get the revs higher to get the pipe really hot. And also a good volume of air moving through the pipe.

[kev1tzr]

I suppose the excess oil could hamper the revs getting up? Could also be bad fuel as is at least a few months old

[Lucass2T]

Sept 2, 2022 14:08:00 GMT -5 kev1tzr said:

Sorry to see that it happened to you too, but on the other hand at least I know it's not a unique issue.

I've started and run it for 30 to 40 minutes at a time (idle and some light revs), it's still smoking huge amounts.

Would it be better to run it under load and higher revs to clear it out?
A longer ride in other words?

Run it like you nirmally would. I've had a Honda sfx once with a similar problem. Run it for a bit and the smoke is gone. Don't idle it for prolonged periods, no engine likes that.

[izzy]

Sept 2, 2022 14:08:00 GMT -5 kev1tzr said:

Hi same thing just happened to me 2 stroke pump failed ,brought ebay one which leaked and didn't fit correctly and flooded the crankcase causing basically a hydrolock(seized due to oil/petrol in case) at first i thought it was a oil pump ratio issue since it was throwing out so much smoke then it seized up would not kick over thought maybe it top end seized due to the original pump failing ,just opened up the top end ,found loads of oil ,was just about to consider and prep for splitting the engine so its great to know i can remove as much as possible and burn the rest out thankfully, i know this was 2 years ago as your thread is in 2022 but did it work out okay burning the excess out ?

[izzy]

Sept 1, 2022 14:57:02 GMT -5 aeroxbud said:

Yes don't you hate it when that happens.

My oil pump died and did the same. And the aftermarket one, so I went premix.

Hi 2 years late on this but it just happened to me ,did it go well burning out the excess oil?

Iv already removed pretty much all of it in the accsessable part of the crankcase

[190mech]

If you got most of the oil out, it should clear the rest out on your first ride, bring a spare spark plug as it may foul one in the clearing out process..

[aeroxbud]

Jan 16, 2024 16:37:37 GMT -5 izzy said:

Sept 1, 2022 14:57:02 GMT -5 aeroxbud said:

Yes don't you hate it when that happens.

My oil pump died and did the same. And the aftermarket one, so I went premix.

Hi 2 years late on this but it just happened to me ,did it go well burning out the excess oil?

Iv already removed pretty much all of it in the accsessable part of the crankcase

Yes it was okay. Switched to premix and just drained the engine first.