White smoke

Hello everybody.

Today I changed oil (after 2hours)(2 hours after rebuild) and I realized, there is a white smoke, when its idling and then I accelerate. The more time at idle, the more smoke when i accelarate. No water disappeared.
I tryied to put a white paper behind the exhaust and accelerate couple of times to see if there are some small droplets of oil, but nothing, the paper is absolutely clean.

When the engine was dry I put a 1,1litres of oil in it and after 2hours I got 900ml of oil from the engine.

Any advice with the white smoke ?

Thank you.

Ah sorry, I didnt mention the bike - Its 650 year 06.

Okay, I will ride for one hour and check it, but I dont want to do a rebuild again ( so soon) .

One more question : how much oil it normaly consumes between oil change (8-10hour) ?

thank you.

Hello everybody,

As there was winter, I have no time, and lust for testing in -10°C

This weekend I kick started it. And give it a short ride. When I let it idle (doesnt matter if cold or hot) after about 30-45second it starting to smoke white-blue, and it starts to increasing revs - if you increase throttle the more smoke comes from the exhaust (like there is a deposit of it..). When I ride it it goes very well with no smoke from the exhaust at all, Not at acceleration, not in decceleration.

Water is stil on the same level, but it drinks a little bit of oil - equaled to the smoke production at idle speed.

Where can be a problem ? My thoughts are engine breather system or the small reed valve in the engine..

What are your thoughts ?

Regards,

Hello Taffy,

I have checked the frame tube, but it doesnt seems to be full of oil. Only a little greasy.

The sponge filter - I have found something like piece of harder foam in it. It wasn oily too..

Im starting to be nervous about it, because asi I wrote above, the engine is after rebuild...

Regards.

Tesa

Hello Taffy,

it was rebuild with new Wiseco piston, new nikasil - which was honned - i measured the tolerance of ovality and it was in 0.02+- So no big deal in "that" diameter. And a new head gasket of course. New conrod, new seals, new bearings (not in gearbox).

I will understand if it will consume oil on hard acceleration .. but on idle ? One more thought - I didnt replace stem seals - and on the idle there are the biggest preasure changes - the oil should leak around them. But it should also will consume oil under braking with engine due the biggest vaccum in inlet... Or am I wrong ?

I will try to look what is going from the exhaust when Im braking with engine from for example 150km/h to 50km/h..

Regards -

Solved.

It was the breathing system. Ive disconected it from the frame and made a catch tank under the engine. Now no smoke at all and no oil consumption.

Radek