Burnin' oil, gs450

[carlos020465]

Hi amigos.
I rebuild the engine; bored, piston, piston ring. I have guided from the Haynes manual (chapter1, section 41). The question is that it spits black oil from the left exhaust. Will be the head problem?
thank you Amigos for your help!

[Dave8338]

Not familiar with the 450's but:

1. Did you make sure that the ring gaps were offset and that the rings were on the correct side up?
2. Did you check the valve guides for wear and fitment? (I think they also have valve stem seals...but not sure)
3. Have you run the engine long enough for the rings to seat in.
4. Checked compression and adjusted the valves?

[p_s]

How many miles on the rings? Mine smoked a lot the first 50, less on the next 100, and zero after 300. Although mine never spat oil.

[carlos020465]

response!

Thank you Amigos:

• Rings is new.
• I didn't check the valve guides.
• I didn't run the engine to much.
• The valves is adjusted.

[Dave8338]

Put a few hundred miles on the bike and see if it clears up...
I'de stay away from the long straight stretches and run up and down through the gears for the first 100 miles or so.

[carlos020465]

Put a few hundred miles on the bike and see if it clears up...
I'de stay away from the long straight stretches and run up and down through the gears for the first 100 miles or so.

Hi Dave:
Thank you for the help!
I will follow your advice.

[Matchless]

I have a friend who replaced the rings and bent one of the two oil scrapers when pushing the #4 piston into the cylinder. He straightened it, as he could not get another set, but it smoked and threw quite a bit of oil out of the exhaust. You could see it clearly on the #4 plug. I gave him a new set and the same thing happened. He got it right with the 3rd set. He was very embarrased as he reconditions small engines for a living!!
Check your plugs to see if it is a specific cylinder or not.