All Things Moto! Web Forums

Go Back   All Things Moto! Web Forums > Dirt Bike - ATV - Suspension Forums > ATV/UTV Forums

     
Reply
 
LinkBack Thread Tools
  #1  
Old 12-09-2004, 08:31 AM
Beginner Class
 
Join Date: Dec 2004
Last Online: 05-31-2005 11:42 AM
Posts: 22
Default 2-stroke Smoking big time!

I've got a little Zuki LT80 4wheeler that I' need to sell. It runs really good but it jsut smokes like crazy. Big solid stream of smoke.

Here's what I do know:
The compression is fine. I don't remember PSI .

I disconnected the oil pump and tested it with pre-mix. That did not make any difference.

Good oil an Gas mix, new plug, clean air box....

What can I try next, Can the carb or jets cause this?

Air Leak? I don't see any air leak but I could keep looking.
Reply With Quote
  #2  
Old 12-09-2004, 08:40 AM
chabat's Avatar
Intermediate Class
 
Join Date: Apr 2004
Last Online: 07-28-2014 11:54 AM
Location: TX
Posts: 487
Default Re: 2-stroke Smoking big time!

My kdx smokes a lot before you "clean it out" by getting on the throttle for a few minutes. Does yours continue to smoke even after it's cleaned out? I mean does it smoke the same amount throughout a say 30 minute ride? Or does it lessen after a few minutes?

Maybe some of the 2 stroke experts on this site can chime in...
Reply With Quote
  #3  
Old 12-09-2004, 08:44 AM
Beginner Class
 
Join Date: Dec 2004
Last Online: 05-31-2005 11:42 AM
Posts: 22
Default Re: 2-stroke Smoking big time!

I can't say that I've stood on it for 30 mins. but I've road it up and down the street a few times.
Reply With Quote
  #4  
Old 12-09-2004, 08:46 AM
Beginner Class
 
Join Date: Dec 2004
Last Online: 05-31-2005 11:42 AM
Posts: 22
Default Re: 2-stroke Smoking big time!

oh what I meant to say was it doesn't change with what I've done so far.
Reply With Quote
  #5  
Old 12-09-2004, 09:17 AM
Vintage Dave393's Avatar
ATM! Pro Class
 
Join Date: Jan 2003
Last Online: 10-12-2012 08:58 PM
Location: San Antonio, TX
Posts: 2,037
Default Re: 2-stroke Smoking big time!

You have a leaking crankshaft seal on the transmission side. It is allowing oil from the transmission to leak into the lower end. The result is that you are running a very rich mix. I'm betting that the smoke is almost blue.
Reply With Quote
  #6  
Old 12-09-2004, 09:20 AM
chabat's Avatar
Intermediate Class
 
Join Date: Apr 2004
Last Online: 07-28-2014 11:54 AM
Location: TX
Posts: 487
Default Re: 2-stroke Smoking big time!

Gotta split the case to fix that Dave?

Dave, when does a bike gain "vintage" designation?
Reply With Quote
  #7  
Old 12-09-2004, 09:35 AM
Vintage Dave393's Avatar
ATM! Pro Class
 
Join Date: Jan 2003
Last Online: 10-12-2012 08:58 PM
Location: San Antonio, TX
Posts: 2,037
Default Re: 2-stroke Smoking big time!

Don't necessarily have to split the case. It depends on the design of seal area. If the entire seal can be seen behind the primary gear, it usually can be replaced without splitting the cases.

"Vintage" is a bike with 7" front 4" rear travel with a model year of 1974 or earlier.

"Evolution" bikes are model years 1975-1983.

There are sub-classes in each designation.
Reply With Quote
  #8  
Old 12-09-2004, 09:51 AM
ktyfz's Avatar
Pro Class
 
Join Date: Oct 2004
Last Online: 06-29-2008 09:19 PM
Location: Herriman, UT
Posts: 1,336
Default Re: 2-stroke Smoking big time!

I have a two-stroke Polaris Scrambler 400 that smokes when it is first started, but after it warms up the smoke goes away. Would this still be a bad transmission seal too?
Reply With Quote
  #9  
Old 12-09-2004, 09:58 AM
twoofeach's Avatar
ATM! Pro Class
 
Join Date: Jan 2004
Location: Visalia, CA
Posts: 2,426
Default Re: 2-stroke Smoking big time!

Quote:
Originally posted by Crunk
I have a two-stroke Polaris Scrambler 400 that smokes when it is first started, but after it warms up the smoke goes away. Would this still be a bad transmission seal too?
No, that is normal. Most two stroke riders smoke during warm up...I mean most two stroke engines smoke when cold. A few minutes. Once the engine warms up, the smoking stops. The problem is when it doesn't stop like TPinTX's situation.
Reply With Quote
  #10  
Old 12-09-2004, 11:43 AM
Beginner Class
 
Join Date: Dec 2004
Last Online: 05-31-2005 11:42 AM
Posts: 22
Default Re: 2-stroke Smoking big time!

Okay....well the good news is that stops me from tearing into the carb like I was about to do..

Thanks for the valuable info.
Reply With Quote
  #11  
Old 12-09-2004, 11:49 AM
Mr.Boof's Avatar
Banned
 
Join Date: Mar 2004
Last Online: 07-17-2005 10:42 PM
Posts: 2,156
Default Re: 2-stroke Smoking big time!

Maybe it is just running rich.. like my bike, its running rich. but the smoke doesnt pour out. its just every time i blip the throttle, this is because i am running rich...
Reply With Quote
  #12  
Old 12-09-2004, 11:54 AM
Beginner Class
 
Join Date: Dec 2004
Last Online: 05-31-2005 11:42 AM
Posts: 22
Default Re: 2-stroke Smoking big time!

hey Dave would you mind looking at one or more of these schematics and see what you think

[Only registered and activated users can see links. ]

[Only registered and activated users can see links. ]


[Only registered and activated users can see links. ]

tanks buweet
Reply With Quote
  #13  
Old 12-14-2004, 05:30 PM
Beginner Class
 
Join Date: Dec 2004
Last Online: 05-31-2005 11:42 AM
Posts: 22
Default Re: 2-stroke Smoking big time!

You know what fellas, this thing doesn't have a tranny. There is no crank oil to burn.

Any other suggestions?
Reply With Quote
  #14  
Old 12-14-2004, 05:34 PM
SirFallsALot243's Avatar
ATM! Pro Class
 
Join Date: Sep 2003
Last Online: 07-22-2008 01:44 AM
Location: Pennsylvania
Posts: 3,915
Default Re: 2-stroke Smoking big time!

I was thinking rich jetting. I dont know why no one said that... maybe im missing something. Jetting it would be a whole lot easier then splitting the cases though. Clean the carb real good before you put any money into fixing it.
Reply With Quote
  #15  
Old 12-14-2004, 06:06 PM
Vintage Dave393's Avatar
ATM! Pro Class
 
Join Date: Jan 2003
Last Online: 10-12-2012 08:58 PM
Location: San Antonio, TX
Posts: 2,037
Default Re: 2-stroke Smoking big time!

Replace part #14 on the last link you posted. That is the tranny side crank seal.
Looks like it can be replaced without having to split the cases.

It may not have a manual transmission, but if it goes forward or reverse it has to have some sort of transmission. That's how power makes it from the crankshaft to the rear wheel.

It's not jetting. Jetting problems cause BLACK smoke. Crank seal issues cause BLUE or WHITE (on air-cooled engines) smoke.
Reply With Quote
Sponsored Ads
Reply

  All Things Moto! Web Forums > Dirt Bike - ATV - Suspension Forums > ATV/UTV Forums


Bookmarks

Thread Tools


Similar Threads for: 2-stroke Smoking big time!
Thread Thread Starter Forum Replies Last Post
LT 50h help Smoking and spitting oil donnie2778 ATV/UTV - Suzuki 3 11-29-2007 07:35 AM
Popping/Smoking? redrider4 2-Stroke Dirt Bikes - Honda 4 04-22-2007 01:10 PM
Time for Maintenance (2 & 4 stroke) Gurus requested! hevnsnt General Discussion 4 07-10-2004 08:17 PM
smoking thenubsterman 2-Stroke Dirt Bikes - Kawasaki 8 04-08-2004 03:36 AM
it 250 smoking 1981 it250h 2-Stroke Dirt Bikes - Yamaha 0 01-31-2004 05:58 PM


All times are GMT -6. The time now is 05:05 AM.

Portal Forums Photo Gallery Popular Tags RSS Feeds

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright ©2002-2014, JDub Consulting, Inc. All Right Reserved.