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Old 10-15-2003, 08:05 AM   #1
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hey guys....i'm just new to nitro and was wondering..i just got an engine and it has 3 needles in it....my question is...when i fire it up...how would i know which needle to turn?...as there any particular pattern..like these first then these then these??....i have a nova mega sx12


and for breaking in...do i just leave the needle as it is (factory setttings) or do i have to adjust it while breaking in?
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Old 10-15-2003, 08:40 AM   #2
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yeah just leave the needles at factory settings they should be set right for breaking it in just check them by your manuel to make sure....and when you say three needles do you mean it has a low,mid and high and a idle....or do you mean low,high and idle
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Old 10-15-2003, 11:04 AM   #3
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Novarossi doesn't mention the stock settings in the manual. To be safe I would richen the low and top end needles 1/4 to 1/2 turn and go from there. When breaking in, adjust the top end needle first. You may have to touch the low end just to get it to idle. DON'T touch the mid needle!
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Old 10-16-2003, 08:09 PM   #4
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ok..i was in myTSN.com forum and i found this...here's the link...

http://www.mytsn.com/forums/forum.as...lo=1&sm=0&fi=1

i just copied that but i went for turns on the main needle...right now the engine is running a rich at 150 to 170...i already ran half of the galon...i ran it at full throtle for about 2 seconds and let it coast...is that safe??...but most of the time i run it at least at 50% throttle...

i have one more question...everytime i leave it to idle it runs flat then the rpm slows down and die for about 8 seconds...is there anyway to make this thing just idle flat w/o dying?...
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Old 10-16-2003, 10:08 PM   #5
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If you've gone through 10 tanks of fuel or more, then your engine should be ready to race. Your idle problem is probably the rich needle settings. You have so much fuel compared to air then glow plug cools off so much it won't ignite the fuel. When you start leaning the mixture by turning in the high speed needle, the idle will improve. Do not mess with the midrange needle which is the screw in the side of carb under the high speed needle. Just remember to keep the temperatures between 210F to 230F. See if one of the guys at your local track will help you tune the carburetor.
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Old 10-17-2003, 06:13 AM   #6
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i think it's still running rich....'cause when i check my plug it's wet...can anyone tell me if this procedure is accurate on setting the needles...here's the link

http://www.mytsn.com/publ/publ.asp?sn=2&pid=2242&exp=13

just set the language to english...thnx guys...
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Old 10-17-2003, 05:20 PM   #7
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I think that's a good starting point. It's similar to how I try to start out before going on the track. But remember that the engine will behave differently on the track when it's under load.

It's better to start on the richer side than on the leaner side. On the track pay attention to the smoke out of the pipe, it's a good indicator of mixture throughout the rev range. If you don't see smoke, it's too lean.

A few tips I have learned that some people might not agree with. I'm not an expert tuner yet so these are just my thoughts: when you're tuning, don't be afraid to turn the needles in 1/4 turn increments to find a baseline. This will help you find sort of bounderies for too lean to too rich. But you have the be carefull doing this that you don't get too lean. Then make smaller increments to optimize the mixture.

When you go out for warm up to tune the engine on the track, run for at least 2minutes before you start leaning. The engine needs a little time to start 'storing' the heat. I've seen people tune after 2 or 3 laps and hit 300F during the race because they leaned too much without enough time building heat. This should give you a better idea what will happen during a race. Also, be aware that the engine will lean out a little as the tank is almost empty so be aware of the resulting temp increase at the end of the run.
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Old 10-17-2003, 07:10 PM   #8
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thnx a lot...i was runnign the car a while ago and it was puffing a little smoke..so i guess its going the right track....i know when leaned too much it will overheat..and i'm watching temp too and running the engine at least 180 to 190.....
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Old 10-20-2003, 03:19 AM   #9
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Get it up another 30-50 degrees. when it flames out its too lean I can't get my RB to Hit 240 before its too lean.......and I'm running it in 70's weather.
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