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Thread: 200s Fresh Bore, Smoking Quite a Bit??

  1. #1
    mike84bigred's Avatar
    mike84bigred is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    200s Fresh Bore, Smoking Quite a Bit??

    Just rebuilt my 200s. Was bored over, new piston +rings obviously. Also did the valve seals. Just got it back running a little bit ago. Started it up, and other than it running a little rough, probably carb adjustments, all was good, until about 4-5 minutes in when it started smoking pretty good. After I completely filled my garage with smoke, I shut it down for a few minutes. I started it back up, and same thing, started smoking again after a few minutes. Its been a while since I did a bore but I don't ever remember this. I have had it running about a total of 25 minutes and its still smoking. Plug is carbon fouled but not wet. Do the rings need more time to set, or do I have other issues here?
    84'200s (Dad bought new in 84, long gone)
    84'YTM200 (sold 02)
    85'KLT160 (sold 05)
    84' Big Red (Cobra exhaust,good shape) sold in 08
    84' Big Red (Parts Bike, runs good though)sold in 08
    85' 250SX (New plastic, Clark Plastic Gas Tank, Web Cam Camshaft, Cobra Exhaust, Moose Jet Kit, etc..) sold in 2010 and highly regret!!!
    04 Polaris Sportsman (Swapped 400 motor with a 500, Polaris wheels w/Kendra Bearclaws, Moose Fender Flares, Brushguard, Warn Winch)
    84 200s (Needs work!)

  2. #2
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    I think your exhaust is filled with oil from it being whooped before you rebuilt it. That's why it's smoking after coming up to temp. Go ride it,run it. Don't lug it or over rev it. Check your oil. And after an hour or two,all will be clear if you did things right inside.
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  3. #3
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    Quote Originally Posted by atc007 View Post
    I think your exhaust is filled with oil from it being whooped before you rebuilt it. That's why it's smoking after coming up to temp. Go ride it,run it. Don't lug it or over rev it. Check your oil. And after an hour or two,all will be clear if you did things right inside.
    Agreed but I would do a compression test before you do this. If nothing else it's a good reference if you have any issues down the road.
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    What brand piston kit did you use ?
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  5. #5
    mike84bigred's Avatar
    mike84bigred is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Im not sure off hand. Had G&H do the work.
    84'200s (Dad bought new in 84, long gone)
    84'YTM200 (sold 02)
    85'KLT160 (sold 05)
    84' Big Red (Cobra exhaust,good shape) sold in 08
    84' Big Red (Parts Bike, runs good though)sold in 08
    85' 250SX (New plastic, Clark Plastic Gas Tank, Web Cam Camshaft, Cobra Exhaust, Moose Jet Kit, etc..) sold in 2010 and highly regret!!!
    04 Polaris Sportsman (Swapped 400 motor with a 500, Polaris wheels w/Kendra Bearclaws, Moose Fender Flares, Brushguard, Warn Winch)
    84 200s (Needs work!)

  6. #6
    mike84bigred's Avatar
    mike84bigred is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Shindy brand piston
    84'200s (Dad bought new in 84, long gone)
    84'YTM200 (sold 02)
    85'KLT160 (sold 05)
    84' Big Red (Cobra exhaust,good shape) sold in 08
    84' Big Red (Parts Bike, runs good though)sold in 08
    85' 250SX (New plastic, Clark Plastic Gas Tank, Web Cam Camshaft, Cobra Exhaust, Moose Jet Kit, etc..) sold in 2010 and highly regret!!!
    04 Polaris Sportsman (Swapped 400 motor with a 500, Polaris wheels w/Kendra Bearclaws, Moose Fender Flares, Brushguard, Warn Winch)
    84 200s (Needs work!)

  7. #7
    fabiodriven's Avatar
    fabiodriven is offline Aspiring romance novel cover model, and the Official 3WW slayer of thieves and swindlers. Catch me if you can
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    Bill's theory is very sound and I hope for your sake he is correct.

  8. #8
    mike84bigred's Avatar
    mike84bigred is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Me too. Dont know what else it could be. I mean I had the valves out wh enough I did the seals and they looked fine. Piston was matched to the bore. What else could it be?
    84'200s (Dad bought new in 84, long gone)
    84'YTM200 (sold 02)
    85'KLT160 (sold 05)
    84' Big Red (Cobra exhaust,good shape) sold in 08
    84' Big Red (Parts Bike, runs good though)sold in 08
    85' 250SX (New plastic, Clark Plastic Gas Tank, Web Cam Camshaft, Cobra Exhaust, Moose Jet Kit, etc..) sold in 2010 and highly regret!!!
    04 Polaris Sportsman (Swapped 400 motor with a 500, Polaris wheels w/Kendra Bearclaws, Moose Fender Flares, Brushguard, Warn Winch)
    84 200s (Needs work!)

  9. #9
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    You didnt use synthetic oil, did you?
    Looking for a Bassani silencer for a 2nd gen tecate, the style with the movable mount. 1st gen will work

  10. #10
    mike84bigred's Avatar
    mike84bigred is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    No synthetic oil. Regular 10w-30
    84'200s (Dad bought new in 84, long gone)
    84'YTM200 (sold 02)
    85'KLT160 (sold 05)
    84' Big Red (Cobra exhaust,good shape) sold in 08
    84' Big Red (Parts Bike, runs good though)sold in 08
    85' 250SX (New plastic, Clark Plastic Gas Tank, Web Cam Camshaft, Cobra Exhaust, Moose Jet Kit, etc..) sold in 2010 and highly regret!!!
    04 Polaris Sportsman (Swapped 400 motor with a 500, Polaris wheels w/Kendra Bearclaws, Moose Fender Flares, Brushguard, Warn Winch)
    84 200s (Needs work!)

  11. #11
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    You can run syn in this fresh engine till the cows come home. You'll never have a problem. And I would recommend it strongly if you pulled the clutch cover,cleaned your strainer and crankcase?? Hopefully you did! If not you have work to do lol ! If you want reassurance your top end is sound. Pull the breather hose ,if it's smoking out your crankcase. You have a top end problem. But if you're sure you didn't pinch a ring going together,you should be fine.
    Please help those who cannot help themselves.

    ALWAYS buying Museum quality machines,3 and 4 wheels. And any and ALL ,NOS parts,EVERY brand.

    I am turning my PM's Off,my Email is billsracing@hotmail.com,put 3WW in the subject. Thanx!

    Gun laws do not stop criminals. BULLETS do.

  12. #12
    mike84bigred's Avatar
    mike84bigred is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    No I did not pull the clutch cover. Had the oil draining for about 4 months so I figured most of it would have dumped out, but the strainer was not cleaned. No smoke from the crankcase breather tube though. If I pull the plug out after its been running, it will smoke a little but figured the new parts will smoke for a bit.
    84'200s (Dad bought new in 84, long gone)
    84'YTM200 (sold 02)
    85'KLT160 (sold 05)
    84' Big Red (Cobra exhaust,good shape) sold in 08
    84' Big Red (Parts Bike, runs good though)sold in 08
    85' 250SX (New plastic, Clark Plastic Gas Tank, Web Cam Camshaft, Cobra Exhaust, Moose Jet Kit, etc..) sold in 2010 and highly regret!!!
    04 Polaris Sportsman (Swapped 400 motor with a 500, Polaris wheels w/Kendra Bearclaws, Moose Fender Flares, Brushguard, Warn Winch)
    84 200s (Needs work!)

  13. #13
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    Just to add my $0.02 to all of the good advice already given: I did the topend on my ATC110 with a cheap ebay piston about 4 years ago. Like yours, it smoked initially after the rebuild nearly as much as it did before. But the more we ran it, the better it got. Now it doesn't smoke at all. In point of fact it runs so good now, my boy smoked the clutch pack in it! LOL!

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  14. #14
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    4 months is a great drain! But I would tear in and clean the strainer out. There are manuals on here if you haven't done one before. Also,I Always flush the engine while ANY cover is off. Gas is what I've always used,,diesel or kerosene if that makes you feel better. Then ether as my last clean up. Starting over fresh again. Get all that grit out of there and that top end will last forever with a fresh oiled air filter and clean oil,of any kind
    Please help those who cannot help themselves.

    ALWAYS buying Museum quality machines,3 and 4 wheels. And any and ALL ,NOS parts,EVERY brand.

    I am turning my PM's Off,my Email is billsracing@hotmail.com,put 3WW in the subject. Thanx!

    Gun laws do not stop criminals. BULLETS do.

  15. #15
    mike84bigred's Avatar
    mike84bigred is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    I ran it yesterday with basically only the things to make the engine run. Have to put the air filter and gas tank back on and get the carb adjusted right. If you turn the fuel/ air screw in, is that more air or fuel? After I get it all back together, ill bomb it around the yard and see if it clears up. Im hoping the rings may have not quite set yet or like Bill said, left over oil in the head.
    84'200s (Dad bought new in 84, long gone)
    84'YTM200 (sold 02)
    85'KLT160 (sold 05)
    84' Big Red (Cobra exhaust,good shape) sold in 08
    84' Big Red (Parts Bike, runs good though)sold in 08
    85' 250SX (New plastic, Clark Plastic Gas Tank, Web Cam Camshaft, Cobra Exhaust, Moose Jet Kit, etc..) sold in 2010 and highly regret!!!
    04 Polaris Sportsman (Swapped 400 motor with a 500, Polaris wheels w/Kendra Bearclaws, Moose Fender Flares, Brushguard, Warn Winch)
    84 200s (Needs work!)

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