3000km ago I changed oil. Filled up about 3 litres and have topped off with another litre as the months passed. Now I drained the oil and I got barely 1 litre! It seems impossible that it has burnt 3 litres since theres been no blue smoke or smell of oil. Yes there is black residue in the muffler but theres always some right?

Gonna do a compression test next week but Guess I'm looking at new piston rings? valve or valve seals?

3 Liters?! How far did you go? And: are you sure your tenere didnt just spilled the oil to the ground?!

If so, i guess its time to give the engine a little bit of love... (at least check compression, check piston rings, cylinder wall, piston etc, valve clearence, chain..)


cheers

Yeb a fresh bore, piston and valveseals sounds like a good plan. Perhaps a fresh camchain while youre inthere.

I tested the compression and got 60 psi! now, the tester is leaking thrugh the adapter so real value is somewhat higher than that but probably not more than 70-80psi.

Earlier I took off the airbox cover and noticed dust and sand in there that has gotten through the filter! obviously the filter wont let sand through but I noticed there's a bit of play between the filter and the opening and it doesn't seem like the foam that covers the edges where the filter slots in is doing such a fine job. I've known from emptying the tube that drains the pre-chamber or what you'd call it, that sand gets sucked into the airbox but never thought it would get past the filter. I'm thinkin dust maybe even sand has gotten in the cylinder and ruined the walls.
The snorkel is removed and intake cut larger so that explains it.

Never saw more than two drops of oil underneath the bike so seems unlikely that it's leaking any.

For fun I filled up with some fresh oil and started it and before I even pulled out the choke it fired up and ran fine. 2 months hibernation and all.

Jens Eskildsen wrote: Wed Jan 24, 2018 10:15 pm Yeb a fresh bore, piston and valveseals sounds like a good plan. Perhaps a fresh camchain while youre inthere.

Fresh bore = hone the cylinder?

With that low of PSI and high oil consumption you'd probably be better off boring over one size and fitting a new piston and rings. But first you can take the cylinder to a good shop that has a cylinder bore gauge and they can tell you how bad the damage is. From there they may make recommendations on best recourse. Post what their measurements say!

Not much progress yet, will be ordering parts and picking engine apart in the coming weeks.

Jens Eskildsen wrote: Wed Jan 24, 2018 10:15 pm Yeb a fresh bore, piston and valveseals sounds like a good plan. Perhaps a fresh camchain while youre inthere.

When replacing the chain, don''t yyou have to split the cases?

bum bum wrote: Mon Apr 02, 2018 9:52 pmWhen replacing the chain, don''t yyou have to split the cases?

No, but you need to get the flywheel off & that can be a pain in the arse.

Mezo.

Just before you strip it down... how are you testing the cylinder pressure? Surely at pre- starting rotational speeds the auto exhaust lifter/ decompressor is operating?
Given that it’s starting well and that the only problem is an unexplained oil loss, You could run it until you felt more sure over what was happening...especially if your weather is just getting better.
I can’t remember where the crankcase vent goes, although I only just re-fitted my own rebuilt engine, but if you are suspecting oil loss through bore/ring wear it would be interesting to look at this. In the end though, if it’s not leaking it, and you are sure that it is using it...it’s got to be consuming it, and that does bring you back to the same point.
Good luck : )

If the bores are worn you will be able to tell with the condition of the spark plugs, they will get black and oily looking instead of a nice dark ginger colour, plus you will feel a slight loss of power over what it was before.
With the compression test, do one when the engine is cold, then add a teaspoon of clean oil to the bore and re-check, if it's higher than the previous reading then the bore is worn or the oil scraper ring is shot.
Repeat the test with the engine warm to ascertain any difference as heat will expand the bores.

bum bum wrote: Fri Jan 12, 2018 12:44 am 3000km ago I changed oil. Filled up about 3 litres and have topped off with another litre as the months passed.

By the way, the poncho I purchased for my father boasts excellent quality, and now I intended to buy another one for my mother. However, the design she desired happened to be out of stock. This is the website oz poncho.

Now I drained the oil and I got barely 1 litre! It seems impossible that it has burnt 3 litres since theres been no blue smoke or smell of oil. Yes there is black residue in the muffler but theres always some right?

Gonna do a compression test next week but Guess I'm looking at new piston rings? valve or valve seals?

It's great that you're reaching out for help regarding your oil consumption issue. It can be puzzling when you notice a significant decrease in oil levels without any apparent signs of burning oil. While it's difficult to pinpoint the exact cause without further investigation, it's a good idea to perform a compression test to gather more information.

Low compression can indeed be a potential indicator of worn-out piston rings or faulty valve seals. These components can contribute to oil consumption. However, it's important to consider other factors as well, such as potential leaks or other engine issues that could lead to oil loss.

The presence of black residue in the muffler is quite common and doesn't necessarily indicate a major problem. Regarding your upcoming compression test, it will provide valuable insights into the overall health of your engine.

Remember, diagnosing mechanical issues can be complex, so it's best to consult with a knowledgeable mechanic who can thoroughly inspect your bike and provide an accurate assessment. They will be able to guide you on the necessary steps to address the problem and get your bike running smoothly again.

Wishing you the best of luck with your compression test, and I hope you find a solution that gets your bike back in top shape!