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The TTR250 FAQ web pages -> TTR250 -> Carb stuff -> Starting problems - any tips?
Post Info TOPIC: Starting problems - any tips?
DC


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Starting problems - any tips?
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The bike was standing for 18-months with fuel in, carb not drained.  It would crank over but not run. So far I have done the following..

 

- Emptied old fuel in tank, filled up with a couple of litres of new fuel

- Carb removed. Took apart from the float side only. Cleaned jets, diaphragm, bowl and float, and mix screw.  The pilot jet was completely blocked.  Managed to unblock with a piece of wire and cleaned out. New bowl gasket installed.

- Recharged battery fully.

- New iridium spark plug installed and tested good.

- Mix screw set to 2.5 turns out.

 

Now the bike starts with full choke and a spray of easy start.  But dies immediately as the throttle is slightly opened, or dies after 10 secs anyway after coughing and spluttering.  

What should be my next step?  Thanks.



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Paul, Surrey UK.  

TTROOKIES.  Three Blokes. Three TTRs.  All the gear and no idea.
Cubber


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Clean the thing PROPERLY. wink

It sounds as if one of your jets is still blocked.

Another tip - put "starting" into the Search option at the top centre of the page to see other people's problems and resolutions.

If it was running 18 months ago and then left with a full carburettor then suspicion points directly to the carburettor.

Taking it off completely and checking it thoroughly is the best thing to do.

Martyn



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East Budleigh. Devon
DC


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Thanks Martyn.  I kinda knew the carb would be coming back off.  Perhaps the wire passing through the pilot jet wasn't sufficient?  Any recommendations on what I can use to clean it out a bit better?



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Paul, Surrey UK.  

TTROOKIES.  Three Blokes. Three TTRs.  All the gear and no idea.
peteBLUEttr


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Soak in strong solvent for good long while, then blow through with compressed air, plus use your piece of wire again. Put some silkolene pro fst fuel system treatment in the first tankful too if you like.

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Pete. South Somerset, England.
DC


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peteBLUEttr wrote:

Soak in strong solvent for good long while, then blow through with compressed air, plus use your piece of wire again. Put some silkolene pro fst fuel system treatment in the first tankful too if you like.

  Thanks Pete,  I assume you mean just soak the jets and not the whole carb?    I friend of mine also suggested the fuel treatment, so I think I will do that as well.



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Paul, Surrey UK.  

TTROOKIES.  Three Blokes. Three TTRs.  All the gear and no idea.
peteBLUEttr


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Yes just jets

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DC


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OK, so I see that just the wire passing the pilot jet wasn't enough, it was blocked again.  So this time I use a little tiny micro drill bit, which did the trick nicely.  And cleaned the whole carb again.  I have progress, in that the bike now starts on full choke.  I let it run for a while, but even then closing the choke would result in the engine to die every time.

So I took it for a ride around the block.  It just runs horrid.  Using the throttle will cause it to die, its jerky, lumpy, then suddenly the revs will go up for now reason.  Its basicaslly all over the place no



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Paul, Surrey UK.  

TTROOKIES.  Three Blokes. Three TTRs.  All the gear and no idea.
peteBLUEttr


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Sounds to me as if its pulling in extra air somewhere, is everything seated nicely in that area?

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Pete. South Somerset, England.
TTRfan


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Is the inlet stub intact? Sometimes the rubber can break loose from the aluminium stub or crack/split and let air in. Sometimes hard to spot.

Brian



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DC


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It's as good as I can get it.  It is fidly getting it to sit right.  It is all in one piece, no splits or anything.  But the only thing is the outlet manifold pipe clip is bent.  I did noticed this and straightenhed it, but when screwing back up it bent again.  But it doesn't seem to have unseated the pipe, and it seems airtight.  What do you think?

Oh and Brian, aren't you supposed to be on holiday! 

 

 IMG_2274.JPG

 



-- Edited by DC on Sunday 22nd of March 2015 07:22:34 PM



-- Edited by DC on Sunday 22nd of March 2015 07:22:52 PM

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Paul, Surrey UK.  

TTROOKIES.  Three Blokes. Three TTRs.  All the gear and no idea.
DC


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And a pic from the other side..

IMG_2280.JPG



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Paul, Surrey UK.  

TTROOKIES.  Three Blokes. Three TTRs.  All the gear and no idea.
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