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Old 02-02-2005, 03:34 PM   #1
Mr X
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engine tuning help

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i thought i was pretty good at tuning but i guess i was wrong. when i get my engine running it runs good and has good low end. but when i give it full throttle it goes and gets to a certain speed about 3/4 throttle and then makes a bogging noise the engine sounds like when you try starting a car that doesnt fire, the rpms go up and down with a deep noise there is no smoke coming out when it does that. i run it now in -1 degree weather with no body. i have tryed everything leaning and richening every needle. should i try covering the head in aluminum tape to warm it up? my temp gauge says its running at 189 farenheight. im running a hpi .21BB in a tmaxx and using backyard basher fuel (20% nitro and 16% oil)
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Old 02-02-2005, 03:44 PM   #2
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it sound like your high speed niddle valve is giving you the problem make small ajustments it maybe running to lean...or check your cooling head make sure all the bolts are tight check that your not sucking air.
check out my pics
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Old 02-02-2005, 04:38 PM   #3
Mr X
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i dont think that there are any air leaks or anything but i wrapped 1/3 of the cooling head with aluminum tape and made it richer. it helped but whenever i change the carb it leans itself due to the gas tank having less fuel. is there a mod or a different tank i can get so i dont have to change the setting as the gas tank has less fuel.
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Old 02-03-2005, 12:12 AM   #4
John Bakker
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TRy using a lower tank like 1/8 scale or a nitro rustler tank (below the carb)it may solve the lean out problem as the feul tank empties.Or...tune your truck at half a tank
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