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Old 03-10-2010, 08:40 PM   #1
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Default Changed fuel and problems

I have gone to trying out for the first time nitroX 30% with 10%oil on my losi truggy 2.0 stock .28 motor.
I reset low and high needles to stock recommendations as per manual and both are set at 2 ½ turns out from bottom.

The motor fires up almost straight away so I let it idle for it to warm up but after about 20/30 secs it starts increasing speed by itself and keeps on climbing towards max RPM.
I kept an eye on the carby throttle and did not see it open/move to create this quick increase of RPM.

Suggestions please in what I need to do.
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Old 03-10-2010, 08:57 PM   #2
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What fuel did you have before? And what engine do you run exactly??
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Old 03-10-2010, 09:07 PM   #3
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The fuel before was one that the local hobby store had and most guys said get something better,so I did.It was 20 % and 16 % oil.

Last time an experienced driver tuned it for me.
This is the Losi 454 engine they supply as RTR.
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Old 03-10-2010, 09:08 PM   #4
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Check for leaks
Add a shim to the head
Go 1 step cooler plug
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Old 03-10-2010, 09:11 PM   #5
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I'm using a O.S. number 8 plug
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Old 03-11-2010, 08:43 AM   #6
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You have to retune - - - -
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Old 03-11-2010, 09:01 AM   #7
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If it idles up really really fast then check your idle first. If it idles down then idles up, could be a rich low speed.


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Old 03-11-2010, 09:08 AM   #8
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that is to be expected, every time you change fuel (different, nitro, oil content or brand) you will have to retune.
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Old 03-11-2010, 09:10 AM   #9
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Quote:
Originally Posted by RAlmeida View Post
that is to be expected, every time you change fuel (different, nitro, oil content or brand) you will have to retune.
especially from 20 to 30 percent


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Old 03-12-2010, 07:13 AM   #10
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Thanks guys i'll give it a go tomorrow and report back
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Old 03-12-2010, 08:26 AM   #11
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make sure that plug is the correct length! Some of the OS plugs have long or short bodies. if you used a long body in a short application you'll increase compression drastically, and if you use too short of a plug in a long body app, then your decreasing the compression majorly. this is why you should buy and use the plugs suggested from the manufacture.
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Old 03-12-2010, 08:52 AM   #12
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+1 on what joe sayed. but also sounds like a air leak at bearing. the motor is warming up and metal is expanding causing airleak. also check to make sure your not getting airbubls in your fuel line from faulty line or tank
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Old 03-12-2010, 08:58 AM   #13
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guaranteed it is wayyyyy too lean bro !!
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Old 03-12-2010, 09:16 AM   #14
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Quote:
Originally Posted by houston View Post
guaranteed it is wayyyyy too lean bro !!
thats what i was thinking
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