RustyOne

iTrader: (26)

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.

Pro24888

What fuel did you have before? And what engine do you run exactly??

RustyOne

iTrader: (26)

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.

boomgagem

iTrader: (45)

Check for leaks
Add a shim to the head
Go 1 step cooler plug

RustyOne

iTrader: (26)

I'm using a O.S. number 8 plug

geejay

iTrader: (1)

You have to retune - - - -

NuthinFancy91

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.


-Bo

RAlmeida

iTrader: (2)

that is to be expected, every time you change fuel (different, nitro, oil content or brand) you will have to retune.

geejay

iTrader: (1)

especially from 20 to 30 percent


1+

RustyOne

iTrader: (26)

Thanks guys i'll give it a go tomorrow and report back

jpalessi

iTrader: (55)

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.

jbright33

iTrader: (15)

+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

houston

iTrader: (96)

guaranteed it is wayyyyy too lean bro !!

losi_racer

iTrader: (25)

thats what i was thinking