white smoke

[steck]

so what y'all think white smoke would indicate out of the exhaust pipe of Honda 110..


before I noticed black on start up, fouling plugs, and would quit after it was hot , then i changed oil - (as it needed real bad) and it was good for a week or two...

now its white from start to hot..but runs great !

[dougspcs]

so what y'all think white smoke would indicate out of the exhaust pipe of Honda 110..


before I noticed black on start up, fouling plugs, and would quit after it was hot , then i changed oil - (as it needed real bad) and it was good for a week or two...

now its white from start to hot..but runs great !

Since unburned fuel and oil can some have give a white smoke appearance at times..what does it smell of. They sure don't smell the same..

Best way to tell is your nose!

[barnett468]

My experience is that white smoke in a non water cooled engine is oil, virtually all of the time. To help determine if it’s oil you can do the following.

Remove plug after running with no choke for a few minutes and inspect it after it has sat for 5 minutes. If it looks even remotely damp ANYWHERE including the bottom of the threads it is burning oil.

Do a compression test with a high quality gauge and a short, small diameter hose. If your compression is around 140 or less than it also points to oil plus worn rings and/or valves seals and/or guides.

Keep it clean and on topic!!
Howdy

[atc007]

You need new rings and a hone. Almost definitely to do it right,you will need a piston kit and overbore with a valve job.

[El Camexican]

What Barnett said. If it has compression do the valve seals. If not rebuild it like ATC007 says. I just finished pulling a 2004 XR400 out of mothballs for a guy. It's been sitting for over 7 years without even being kicked over, it is practically new and it blows white smoke like a Chinese steam factory for about 5 minutes after start up and then runs like a top. Excess fuel smoke is usually black.

I’m going to go out on a limb here a little and say that in my experience oil that comes in through the valve seals in small amounts usually comes out the pipe white and without a lot of odor where as a bad ring leak can have a blue tint and smells a lot. I’m speculating that this has something to do with the ring oil being exposed to the flame of the combustion chamber where as a seal leak, if not too bad never makes it into the combustion chamber and only gets hot inside the exhaust pipe. Again, purely speculation on my part based on what few vehicles I’ve worked on that had these issues.

On a slightly different note and something I do know for sure, a nice tight engine does not necessarily need valve seals. I never ran them on my drag bike engines because the friction of a seal at high RPM can actually cause a valve to “float” and get bent by the piston and it takes more HP to move the valve train. Sometimes on startup I would get a little puff of smoke from any oil that leaked in overnight, but that was it. Once the parts get hot the only oil getting in is just enough to lubricate the valve stems nicely with virtually no smoke or smell. I don’t recommend this for a daily driver, but anything that runs less than 15 minutes at a time and has good valves and guides may want to consider this as a performance trick.

[steck]

thx amigo's !! appreciate the advice..

will do compression test, and go from there..valve seals seems logical

[atc007]

I'll put a nice crisp $100 bill on ring seal versus valve seals . Any takers? lol . Your smoke is coming from your cylinder. A valve job is a given while in there,but is not your cloud dusting problem

[El Camexican]

I'll put a nice crisp $100 bill on ring seal versus valve seals . Any takers? lol

No! I'm already down a game on my $10 hockey bet!