Smoke bellows out on occasions

[BadBrad]

Hey guys/gals,
Just recently, when riding my '05 Pitbull, smoke will bellow out the exhaust when I come to a stop, but not every time. Probably once every 10 stops, smoke will come out like it's getting stored up somewhere and then gets released into the cylinder. It's white smoke and very much the smell of oil. I have not checked my plugs yet but figured with all the smoke, they may soon foul. Bike is running great! No misses, spits or sputters. Just an embarrassing amount of smoke that will fog up anything close to me. After I take off, the smoke stops and may not happen again for several more stops. I can ride an hour or two without it happening, but then when I bring the bike to a stop, it happens. Any ideas on what may cause this? Oil consumption does seem to have increased.

 

[Eric]

well you gotta ride in the back in pcb......tell rocky to quit feedn you beens .. dude youleft that wide open. I'd say more but I wouldnt wana degrade your thread,, (you know) anyway.. I thought white or black (blk being way rich) smoke was fuel.. blue/ grayish was oil.. I may be wrong.. dead will clear you up.... if it is oil I might start by checking the vent check valve from the head,, unless you got it vented to the ground..

 

[bdmridgeback]

OK, here is a test. My 2005 Ridgeback used to do the exact same thing.
It ended up being trashed valve guides.

Go to a big parking lot like Lowe's or Home Depot. Ride in a fairly tight right hand circle, about three loops, and then straighten out and get on the throttle. Mine would puke smoke almost every time that this was done. It would do it in a right hand (Clockwise) circle but not in a left hand. That was how the dealer diagnosed what it was. They tore it down and the valve guides were gone at 2000 miles.

Good luck!

 

[mobsta]

how about on decel?that would also be guides

 

[narow37]

my first thought was valve guides. do you have the TP rocker boxes?

 

[BadBrad]

I do have the TP rockerboxes.Already had a valve break mid stem and completely trashed the rear cylinder/head/piston. Changed that out and no problems since then till now. Well, that's not completely true. I did have a bolt in the rockerbox vibrate out and jammed beside the valve, bending the valve. Got that changed out and now this. I'll try the right hand turn test. Right now, just seems to happen on decel. Shouldn't I be able to pull the rocker box lid and see if oil is burning out by the valve guide? I remember what Raywood's looked like when he tore his bike down and posted the pics. Shit. Beginning of summer and looking at having valve guides replaced. If that is the problem, no sense in going back with TP rocker boxes. Seems to be a pattern here. Any other ideas on what may cause excessive smoke on decel.......but just every now and then?

 

[mobsta]

valve guide seal will also cause oil burning on decel,just sayn

 

[Raywood]

I do have the TP rockerboxes.Already had a valve break mid stem and completely trashed the rear cylinder/head/piston. Changed that out and no problems since then till now. Well, that's not completely true. I did have a bolt in the rockerbox vibrate out and jammed beside the valve, bending the valve. Got that changed out and now this. I'll try the right hand turn test. Right now, just seems to happen on decel. Shouldn't I be able to pull the rocker box lid and see if oil is burning out by the valve guide? I remember what Raywood's looked like when he tore his bike down and posted the pics. Shit. Beginning of summer and looking at having valve guides replaced. If that is the problem, no sense in going back with TP rocker boxes. Seems to be a pattern here. Any other ideas on what may cause excessive smoke on decel.......but just every now and then?

Better bet would be to pull your exhaust and look at the bottom of the guide and see if it's all oily/smoky.
I've put thousands of miles on mine since my top-end and it's been running fine. Only issue this last trip was another clutch cable!

You might check your oil pump check valve and the tappet screen and see if there are any blockages anywhere. Same with your front cylinder vent.

 

[BBChopper]

TP Boxes????

 

[Five Five]

how about on decel?that would also be guides

That would be my thought too Mobsta......deceleration will suck oil into the cylinder on a worn valve guide....

:2thumbs:

 

[Five Five]

Bad Brad....we will all chime in and try to help you....but your wife says you never listen....just saying you know...

"55"

 

[BadBrad]

Bad Brad....we will all chime in and try to help you....but your wife says you never listen....just saying you know...

"55"

I'm listening dammit!!!!! I swear, I'm listening. Wouldn't it always smoke on decel or would this be the preliminary of what's to come? I'll do like Raywood suggested as well and check for plugged lines and the tappet screen. I did notice some black specks of oil behind the exhaust on the frame. That being said, I'm almost sure to see oil on the exhaust valve if I pull the exhaust and look. Assuming it's the valve guides, does this work have to be done by a machine shop or is this something that I might be able to do? I have access to a press and a full machine shop at the GP facility I work at. I can't operate all the equipment, but I know folks who can. What all is involved in changing valve guides? Thanks all

 

[MARV]

pull the heads yourself and send them out to sachs or hillside.

couldnt spend your bike money in better places :2thumbs:

 

[BadBrad]

pull the heads yourself and send them out to sachs or hillside.

couldnt spend your bike money in better places :2thumbs:

Thanks Marv. As far as being certain that valve guides are the problem, am I just looking for burnt oil around the valve guide once I remove the rocker boxes? Hate to sound so ignant!!:loony: I'm mechanically inclined but I only know what I've worked on up till now and valve guides ain't one of 'em. I do remember Raywoods pic of what looks to be a burnt guide. I'll take some pics as I start breaking this down and maybe some others can chime in or learn something too.

 

[TheDeadOne]

pull the heads yourself and send them out to sachs or hillside.

couldnt spend your bike money in better places :2thumbs:

Agreed! :2thumbs:

 

[MARV]

the exhaust valves usually take the most pounding because of the greater angle IMO. pull your pipes and take a look at your exhaust valve guides. bet they look like mine with oil trails running down the outside of them. i've got 20K+ of hard miles since my build so i'm overdue for a clean up.

 

[Eric]

just a thought here.. would leaded gas help this.. as you know lead will lub the valves.. I run a tank through mine about every 5+ tanks.. just wondering... any thoughts? maybe a idea to prevent future problems

 

[BadBrad]

just a thought here.. would leaded gas help this.. as you know lead will lub the valves.. I run a tank through mine about every 5+ tanks.. just wondering... any thoughts? maybe a idea to prevent future problems

Thanks for the suggestions but it looks like the real fix here is to find a set of S&S rocker boxes and have new valve guides pressed in. I'll know for sure once I start pulling things apart. I'll try and get some pics as I go. Looks like my plans for PCB have just changed. :bang:
I guess it's better than driving there and having a valve guide break and do some damage intenerally. Worse yet, a valve break! Been there. Done that.

 

[TheDeadOne]

just a thought here.. would leaded gas help this.. as you know lead will lub the valves.. I run a tank through mine about every 5+ tanks.. just wondering... any thoughts? maybe a idea to prevent future problems

Leaded Gas...WTF are you talking about?


They haven't blended that shit in years, it's illegal for public consumer use! (Outta the pump)

The only leaded fuels I seen in years, is only a few of the racing fuels.

But the motor oils have additives in them to help with upper end lubrication ever since this became an issue when lead was removed from the fuels.

There is another way to help with this, but it's a secret!..:lol::lol::lol:

dead :2thumbs:

 

[RubWhore]

Leaded Gas...WTF are you talking about?


They haven't blended that shit in years, it's illegal for public consumer use! (Outta the pump)

The only leaded fuels I seen in years, is only a few of the racing fuels.

But the motor oils have additives in them to help with upper end lubrication ever since this became an issue when lead was removed from the fuels.

There is another way to help with this, but it's a secret!..:lol::lol::lol:

dead :2thumbs:

I think Eric`s been sucking on Hose`s again

:lol::lol::lol::lol::lol: