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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> TTR 250 Not Igniting? Need Help!!!
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TTR250RIDER


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TTR 250 Not Igniting? Need Help!!!
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I have posted before about my ttr not working after about half throttle as it ran pretty good once I got it and cleaned it up and went through the carb it would go all the way now just recently will notno. I thought it was running to lean so I had a custom sigma 6 jet kit built for the make model year and elevation I adjusted needle I put a new spark plug in and I got a dominator round exhaust and it can perform better up to about between 1/2-3/4 throttle after that it cuts out and seems like it can't ignite that much fuel. I notice with higher octane fuel it helps it but it still doesn't make it go all the way. I'm thinking I need a new ignition cause once the ignition gets warm it can't ignite the amount of fuel it needs to go all out that's what I am guessing and what I've been told by my dad and a family member who races. I want to know what you guys think it is if that or something else and what I would need to correct this. Thanks in advance. Any help is appreciate.



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TTRfan


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Going back to basics, is your petrol cap breather clear and working? If blocked or partially blocked it won't let enough fuel through for the TTR to run properly, especially at higher revs.

Brian



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TTR250RIDER


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The breather is working good and it has a crack at the top of the gas tank where air can get in

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TTRfan


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That's one possibility out of the way then!

Try running it without the airbox cover and see if it runs better. If it does you could be right about it running rich.



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TTR250RIDER


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I have ran it without the cover and without the filter to see and neither work I have 4 main jets in case lean or rich but none p them make it better

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TTRfan


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Float level correct?



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TTR250RIDER


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Float level and needle both have been set

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TTRfan


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Are you running the correct CR9E plug?



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TTR250RIDER


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Yes

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TTRfan


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A random possibility - could the valve timing be out? I have had a situation where a TTR started and ran OK but wouldn't pull higher revs. The timing chain was one tooth out on the camshaft sprockets.

Worth a check. 



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TTRHead


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your running a gas tank with a crack in it???

if you need any parts let me no. breaking a whole bike

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TTR250RIDER


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Yes my tank has a crack but I just blew the whole side out of it. Now it won't hold anything. Where are you located?

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TTR250RIDER


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How hard is it to check the valve timing?

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TTRfan


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See here but if you need any clarification then just ask wink



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TTRfan


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TTR250RIDER wrote:

Where are you located?

 If you click on a members name it will show their profile and whereabouts they live - if they have completed their profile. So TTRHead has put in London.

Some basic geographical information in a profile is really helpful in situations like these - even if it is just the country - which is why I encourage members to put something in.

Brian



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