Engine Fuel Problems

Old 03-19-2013, 06:18 PM
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Default Engine Fuel Problems

Hey Guys,

I just switched from using Losi 30% nitro to Traxxas/Powermaster 33%. When I started the engine, it was running too cold and the engine felt like it was just breaking in. I just finished breaking in the engine and it felt sweet on the losi 30%. I still had a tuning problem with the losi 30% when I went half throttle then returned to normal, it would take 4-5 seconds to return to normal idle. How do I fix this?
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Old 03-19-2013, 07:34 PM
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Originally Posted by george919 View Post
Hey Guys,

I just switched from using Losi 30% nitro to Traxxas/Powermaster 33%. When I started the engine, it was running too cold and the engine felt like it was just breaking in. I just finished breaking in the engine and it felt sweet on the losi 30%. I still had a tuning problem with the losi 30% when I went half throttle then returned to normal, it would take 4-5 seconds to return to normal idle. How do I fix this?
When you change brands of fuel, you basically have to re tune....
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Old 03-19-2013, 07:50 PM
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Originally Posted by george919 View Post
Hey Guys,

I just switched from using Losi 30% nitro to Traxxas/Powermaster 33%. When I started the engine, it was running too cold and the engine felt like it was just breaking in. I just finished breaking in the engine and it felt sweet on the losi 30%. I still had a tuning problem with the losi 30% when I went half throttle then returned to normal, it would take 4-5 seconds to return to normal idle. How do I fix this?
It sounds like your lsn is too rich. If it idles high for a few seconds and then settles down lower, your engine is loading up. Leaning the low speed needle a bit should help. Don't forget to check the idle gap, and double check your high speed adjustment. As was posted above, different fuels will require additional tuning.
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