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View Full Version : Smoke from top of the Motor?


Bender
04-28-2006, 11:37 AM
There alot of smoke comming out from the top of my 86 200x. Its the hole that is right on top of the valve cover. I dont know if its sposed to or not cause it has a rubber hose that connects to the frame that i havent put back on after the rebuild. Is this bad or is it normal? Is it hurting my compression? I thought it might have something to do with my valve not seating right or not at the right time. Why does it do this?
edog
04-28-2006, 11:42 AM
Post a pic of where it's coming from?
Bender
04-28-2006, 01:23 PM
There is a breather hole or somthing on the top of the motor and it has a hose that connects from the hole to the frame. I would post a pic but i dont own a digital camara.
Bender
05-01-2006, 03:51 PM
Nobody can tell me whats wrong?
crackshot
05-01-2006, 03:54 PM
It sounds like a crankcase breather and yes it would be normal to puff air but not billowing smoke.
Bender
05-01-2006, 04:01 PM
it smokes really bad! more than the exhaust!
Bender
05-02-2006, 04:00 PM
So nobody knows what this problem is?
TeamGeek6
05-02-2006, 04:09 PM
Bye-Bye piston rings. thats called "blowby" and its caused when the rings get worn out and cant seal the combustion in the cylinder. The pressure leaks into the crankcase and it has to come out somewhere.

Time for a rebuild.
erectordale
05-02-2006, 04:22 PM
that sounds like blow-by too me as well
Bender
05-02-2006, 04:32 PM
I just rebuilt it in february with a new piston and rings! If the rings were bad then it would burn oil from the exhaust and white smoke and it dont. That cant be the problem!
Bender
05-03-2006, 11:57 AM
the only thing i can think of is something to do with the valves.
crackshot
05-03-2006, 03:47 PM
Did you install rings correctly?
Bender
05-03-2006, 03:51 PM
Yea, the guy that bored it for me put the rings on the piston for me, but this has only done this for the last 2-3 weeks
WIkid500
05-03-2006, 04:08 PM
you been driving around with out an air filter??? sand and metal moving parts don't mix. still sounds like blowby.
Bender
05-03-2006, 04:36 PM
yea i have an airfilter but how could it be blowby?
TeamGeek6
05-03-2006, 06:58 PM
Yea, the guy that bored it for me put the rings on the piston for me, but this has only done this for the last 2-3 weeks

If i had a dollar for every time a biker has told me a shop bored a cylinder and screwed it up...:eek:

10 minutes on an improperly bored cylinder will destroy the rings. "Last 2-3 weeks" is about that long of a time.

Also, you didnt say that the cylinder was honed - was it? If not, by by rings.

Valve guide seals cant cause that. If the valve guides leak, the oil goes in the cylinder and out the exhaust.

Time for a compression check.
Bender
05-04-2006, 11:41 AM
He said he honed it, it felt real nice and smooth. Can you tell by touch? My exhaust would smoke if it was a problem with the rings, right?