rebuilt engine smoking
Close
    
    
Page 1 of 5 123 ... LastLast
Results 1 to 10 of 47
  1. #1
    Senior Member jwtwrider's Avatar
    Join Date
    Aug 2011
    Location
    Central NY
    Posts
    168
    Hi Guys,



    Anyone who read my other posts knows that i have just been through the ringer on rebuilding my 89 TW. I had the top end redone. Replaced all my seals honed cylinder, new piston and rings, new valve seals, new exaust valve and had the machine shop do a valve job. So now my engine runs fine and i have ridden it about 20 miles since i re-built it. But it smokes like crazy is this normal and if so how long can I expect it to last ? Any help or suggestions are greatly appreciated.



    -Josh-
    --If at first you don't succeed try, try again. If you still don't succeed BEAT IT WITH A HAMMER!--

  2. #2
    Senior Member n2o2diver's Avatar
    Join Date
    Jun 2011
    Location
    Dothan, AL
    Posts
    1,715
    Motors are not suppose to smoke! Even if it has just been rebuilt. I'd say you got yourself a problem. Oil is getting into the combustion process somehow. Could be a lot of different problems.
    Hidden Content

    2005 TW200 (SOLD)
    2013 DR650

  3. #3
    Senior Member rm_hm's Avatar
    Join Date
    Jul 2010
    Location
    Near Narrows Bridges, WA State
    Posts
    1,619
    Your running regular dino oil in that rebuild right? Semi or full synthetic oil in a new or rebuilt engine is a no/no.



    Are you still running stock piston and ring sizes or did you go up to 1st oversize?



    What's your compression psi? Stock is listed at 128psi



    What does your plug look like?







    There's always the ever telling leak down test ...



    http://www.dansmc.com/leakdown.htm



    Or



    http://www.motorcycl...t/leakdown.html


  4. Remove Advertisements
    TW200Forum.com
    Advertisements
     

  5. #4
    Senior Member jwtwrider's Avatar
    Join Date
    Aug 2011
    Location
    Central NY
    Posts
    168
    Quote Originally Posted by Rich View Post
    Your running regular dino oil in that rebuild right? Semi or full synthetic oil in a new or rebuilt engine is a no/no.



    Are you still running stock piston and ring sizes or did you go up to 1st oversize?



    What's your compression psi?



    What does your plug look like?







    There's always the ever telling leak down test ...



    http://www.dansmc.com/leakdown.htm



    Or



    http://www.motorcycleproject.com/mot.../leakdown.html
    i am running stock piston, i havent tested the compression but can tomorrow and the plug was a medium tan color. And yes im using yamalube 10w20
    --If at first you don't succeed try, try again. If you still don't succeed BEAT IT WITH A HAMMER!--

  6. #5
    Senior Member pgilles's Avatar
    Join Date
    Jul 2010
    Posts
    918
    If your plug is tan and not oily I'd suspect valve seal.



    Take off the header and take a peak inside at the exhaust valves. If they cut the valve seats with an arbor-guided cutter it could have taken out the seal if debris got in there.



    And take off your valve cover and scope out if the seal is seated and its overall condition.
    Sold bike.



    Youtube vids of old TW's acceleration:

    Hidden Content

    Hidden Content

  7. #6
    Senior Member rm_hm's Avatar
    Join Date
    Jul 2010
    Location
    Near Narrows Bridges, WA State
    Posts
    1,619
    hmm.



    Did the cylinder get measured to make sure it's still within specs for a stock sized piston/rings?



    Wear limits are in the down loadable tw shop manual but I have time to type a couple here.



    Cylinder bore measuring point from top 66.97-67.02mm or 2.637" to 2.639"



    Cylinder bore wear limit 67.10MM or 2.642"



    Some sage advice I've read and benefited from. Link



    Take the piston measurement and subtract it from the cylinder measurement. Compare the result with the piston clearance given by the manufacturer of the piston. If it is within that specification you could hone the cylinder and put in a new set of rings. If it is OVER that specification you will need to bore the cylinder out to the next biggest oversize and buy a new piston and rings.



    Cheap hones will brake the glaze but not much more. At least if you try to do more you are in for a real fun time. The problem is that you can't hold the taper and out of roundness with any kind of accuracy. This is not to say this can't be done, just that it is very hard to do.



    Everybody seems to think a new set of rings should cure everything. I wish it was true... but it's not ! I would say 95 % of the time, especially on a dirt bike, you will need to bore it oversize. Sometimes, on a big street bike, the pistons will be within spec, but on most of the dirt bikes you are going to have to bore it.





    Other TW honing posts



    https://tw200forum.com/forums/62396/ShowPost.aspx



    https://tw200forum.com/forums/77543/ShowPost.aspx







  8. #7
    Senior Member jwtwrider's Avatar
    Join Date
    Aug 2011
    Location
    Central NY
    Posts
    168
    Quote Originally Posted by Rich View Post
    hmm.



    Did the cylinder get measured to make sure it's still within specs for a stock sized piston/rings?



    Wear limits are in the down loadable tw shop manual but I have time to type a couple here.



    Cylinder bore measuring point from top 66.97-67.02mm or 2.637" to 2.639"



    Cylinder bore wear limit 67.10MM or 2.642"



    Some sage advice I've read and benefited from. Link



    Take the piston measurement and subtract it from the cylinder measurement. Compare the result with the piston clearance given by the manufacturer of the piston. If it is within that specification you could hone the cylinder and put in a new set of rings. If it is OVER that specification you will need to bore the cylinder out to the next biggest oversize and buy a new piston and rings.



    Cheap hones will brake the glaze but not much more. At least if you try to do more you are in for a real fun time. The problem is that you can't hold the taper and out of roundness with any kind of accuracy. This is not to say this can't be done, just that it is very hard to do.



    Everybody seems to think a new set of rings should cure everything. I wish it was true... but it's not ! I would say 95 % of the time, especially on a dirt bike, you will need to bore it oversize. Sometimes, on a big street bike, the pistons will be within spec, but on most of the dirt bikes you are going to have to bore it.





    Other TW honing posts



    https://tw200forum.com/forums/62396/ShowPost.aspx



    https://tw200forum.com/forums/77543/ShowPost.aspx





    Im not sure how they did the valve seats.I had the machine shop put in new viton valve seals and do the hone on the cylinder.Gave them a copy of the manual at there request so i am hoping they measured everything as they did tell me that a standard piston was what i needed. Before i re-assembled it i did blast the intake and exaust valves with WD-40

    and also the old valve seals were gone and it smoked before im wondering it it could be oil burning out of the exaust or WD-40 burning off the valves.
    --If at first you don't succeed try, try again. If you still don't succeed BEAT IT WITH A HAMMER!--

  9. #8
    Senior Member biglefti's Avatar
    Join Date
    Oct 2010
    Location
    SCW, AZ
    Posts
    527
    Quote Originally Posted by mrtrytofixit View Post
    Im not sure how they did the valve seats.I had the machine shop put in new viton valve seals and do the hone on the cylinder.Gave them a copy of the manual at there request so i am hoping they measured everything as they did tell me that a standard piston was what i needed. Before i re-assembled it i did blast the intake and exaust valves with WD-40

    and also the old valve seals were gone and it smoked before im wondering it it could be oil burning out of the exaust or WD-40 burning off the valves.


    Any left over oil will burn off within 5 miles of riding, so I doubt that is the issue, unless all you did was start it up and shut it off right away.

  10. #9
    Senior Member jwtwrider's Avatar
    Join Date
    Aug 2011
    Location
    Central NY
    Posts
    168
    Quote Originally Posted by biglefti View Post
    Any left over oil will burn off within 5 miles of riding, so I doubt that is the issue, unless all you did was start it up and shut it off right away.
    i checked my valve clearences and tried to do a compression check but no joy as i dont have the right adaptor for this size plug hole it seems as it smokes less today im wondering if its just going to go away
    --If at first you don't succeed try, try again. If you still don't succeed BEAT IT WITH A HAMMER!--

  11. #10
    Senior Member pgilles's Avatar
    Join Date
    Jul 2010
    Posts
    918
    Quote Originally Posted by mrtrytofixit View Post
    i checked my valve clearences and tried to do a compression check but no joy as i dont have the right adaptor for this size plug hole it seems as it smokes less today im wondering if its just going to go away


    Check your oil level. Make sure it's not going away because you don't have oil left to burn.
    Sold bike.



    Youtube vids of old TW's acceleration:

    Hidden Content

    Hidden Content

Page 1 of 5 123 ... LastLast

Sponosred Links

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Similar Threads

  1. BW 200 Engine
    By RTG in forum Technical Help
    Replies: 18
    Last Post: 07-16-2016, 11:08 AM
  2. How much will you pay for a TW 225 engine?
    By RisingSun in forum General Discussion
    Replies: 14
    Last Post: 07-02-2013, 12:17 PM
  3. Damn! Another Smoking CL Deal!!!
    By RTG in forum TW200 Classifieds
    Replies: 6
    Last Post: 09-30-2012, 08:06 PM
  4. Can't rev engine.
    By pedroenespana in forum Technical Help
    Replies: 14
    Last Post: 08-31-2012, 12:36 PM
  5. smoking tw
    By owlsevensix in forum Technical Help
    Replies: 4
    Last Post: 08-12-2011, 09:41 AM

Search tags for this page

02blaster smoking alot
,
bw200 engine smoking
,
bw200 smokes
,
qwerty
,
rebuilt engine on 02 blaster and seems to smoke a loy
,
rebuilt tw 200 engine
,
replacing valve seals bw200
,

tw200 engine rebuild

,

tw200 motor overhaul

,
tw200 rebuild engine
,
tw200 smoking exuast
,
tw200 white smoke
Click on a term to search for related topics.