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The TTR250 FAQ web pages -> TTR250 -> Carb stuff -> bike starts then stops.
Post Info TOPIC: bike starts then stops.
widge


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bike starts then stops.
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My blue ttr250 has been standing a long time.  It would not start, checked the plug had sparks, so following the excellent guide removed the carburetor.  I took the carb to be cleaned and asked about the state of it.  I was told it was green and manky inside.  Refitted the carb, replaced the plug.  It would not start but eventually fired up for about 20 secs.   Then went and had a cup of tea as it was one of those times when it is best to walk away!  Tried again and it was firing with the starter, and eventually ran somehow at about half throttle.  However as i shut the throttle down it stopped.  It did not start again as I had flattened the battery.  Any ideas for a real novie?

The second question which may be easier is how do you get the airbox to carb pipe to fit squarely? 

Rob



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ttboof


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If it's been standing a long time you may have the same green stuff in the fuel tap take the fuel hose off and check it's clear 

once it's ok put it back on open the screw in the bottom of the carb turn the fuel on and check it's running out before you close the screw again but don't over tighten it which makes it hard to open next time 

then try starting again 



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TTRfan


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Assuming you do ttboof's check and petrol is running out the drain freely check the pilot screw is out about 2 turns.

If the guy(s) that cleaned the carb didn't properly clean the pilot jet that might be a cause.

Ultrasonic cleaning and using carb cleaning spray doesn't usually work on the TTR pilot jet - it needs reaming with a bit of copper wire or similar.

Brian



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widge


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New petrol pipe fitted as the old one had perished. Removed carb again, removed pilot jet and that was clean. Poked wire down the pilot jet orifice in the carb. Reassemble carb. 2 turns out on air screw. Refitted carb (almost!) and the bike burst into life. Thank you for your help, much appreciated.

So the next problem is that I cannot get the airbox tube to fit onto the carb properly,it sits at an angle and will be useless had multiple attempts to align the airbox, any suggestions?

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TTRfan


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Excellent news on the carb!

Regarding the airbox rubber boot, perhaps try loosening the carb on the engine side to see if you get enough movement to fit it. If you can get it on straight then tighten the Jubilee clip to hold it in place whilst you refit the other side of the carb.

If that doesn't work then take the three airbox-to-frame bolts out. That should give loads of movement to fit the rubber, clamp it and then refit the airbox to frame.

Brian



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