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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> BLUE SMOKE ON START UP
Post Info TOPIC: BLUE SMOKE ON START UP
Ross


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BLUE SMOKE ON START UP
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Hi All

I have a 2004 blue ttr with 10000 miles on the clock I only use it for green lanes

Just recently it has started smoking on start up actually usually a few seconds after it has started which continues for a minute or so then clears it doesn't appear to use any oil when running.

It used to do this occasionally now it does it every time and it is worse when it has been left on its side stand 

I use motul 10w 40 semi synthetic which i change every 600 miles.

I believe this is the valve seals but am wondering if it is damaging the bike to use it when its like this? The bike runs fine otherwise, starts easily hot or cold, apart from conking out at the top of Gatesgarth pass the other week due to water in the electrics! I managed to roll down and get it going at the bottom though!

I would be grateful for any advice i have looked at the various threads etc on top end rebuilds but I am very nervous of attempting this myself even though that is one of the reasons why i bought the bike!

Thanks in advance

Ross

 

 

 



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JOHNYBOY


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valve stem seals are your problem you can carry on using it while it gets worse but you must keep an eye on engine oil through sight glass when it starts smoking bad & using a lot of oil its time for the cylinder head off

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Ross


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thanks



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Ross


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What do you call bad?

 



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mossproof


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I agree with John it's most likely valve stem seals. If it was piston rings I would expect a more constant cloud rather than just at startup! It's not a major drama, but long term it is likely to foul the plug and cause coke buildup on the piston crown and in the exhaust tract of the head.
Changing the seals is fairly straightforward if you follow the instructions:

www.ttr250.com/Removing_Cylinder_Head/TTR_head_removal.htm

www.ttr250.com/Rebuilding_cylinder_head/TTR_cylinder_head_rebuild.htm

The most fiddly bit is removing the collets that hold the valves to the springs, and needs either Brian's superthumb or a valve spring compressor that fits(!) or an automatic collet removal tool (I think Steve has one in the shop) but I've never tried one of those to know how easy they are to use for someone new to engine surgery.

Bad is when your mates would rather navigate all day than sit behind you!

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JOHNYBOY


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i agree with you pal but he may be on a budget its ok with us because its not a problem for us removing the head & sort it out

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Ross


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I am on a budget i will give it some thought. I would like to attempt it but would find it quite stressful! Taking the carb off was a major achievement for me! Specially when it worked when i put it back on!

I appreciate the help form both of you. I have looked at the threads too and they are really good but it might be a bit beyond me

Thanks again

Ross



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ttboof


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Im  pretty tight with the cash ,until  it needs the oil topped up regularly  between oil changes id leave it as is .Its usually  only a small amount of oil and doesn't do much other than cause a bit of annoying  smoke .

if its only on start up its prob only the exhaust stem seals at this point ,the inlet seals tend  to cause smoke when opening the throttle after a long down hill  (high inlet vacuum) . 

at his point im guessing you dont have anything to worry about . 

 

off the track a bit 

something i do when i park the bike is bring it up onto compression that way the all the valves are closed and closes off the cylinder to the outside air , prob best suited to bike that are parked for long periods of time 

 

 



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Ross


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Thanks for that I will  try it! I also put planks under the sidestand which keeps it more upright and seems to help.

 

I appreciate everyones time and help

 

Ross



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JOHNYBOY


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when mine was like that i changed the oil i put 15w40 in it did not smoke as much on start up

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petenz


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if it dosn't use oil and only dose it for a few seconds after start up...

forget about it and go riding..



..

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