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Old 08-03-2010, 10:56 AM   #1
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Default Tunning a messed up engine

Hello,

I have a Novarossi N21R and I have changed my fuel from 25% to 30% nitro. The engine didn't start so I messed with my high speed and low speed needle. Now its so messed up I don't know where to start from. Could someone guide me through please if possible?

Thanks.
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Old 08-03-2010, 11:00 AM   #2
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Starting point on a Novarossi carb is flush or close to on both LSN and HSN.
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Old 08-03-2010, 11:02 AM   #3
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Starting point on a Novarossi carb is flush or close to on both LSN and HSN.
what do you mean by flush?
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Old 08-03-2010, 11:02 AM   #4
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your best bet is too set the needles, to the factory settings and lean the top and bottom end needle about 1 turn, that should make the engine fire.
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Old 08-03-2010, 11:08 AM   #5
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Flush= top of needle is level with it's surroundings.
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Old 08-03-2010, 11:10 AM   #6
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your best bet is too set the needles, to the factory settings and lean the top and bottom end needle about 1 turn, that should make the engine fire.
how will i know factory settings? is it flush as explained above?
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Old 08-03-2010, 11:20 AM   #7
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how will i know factory settings? is it flush as explained above?
Factory Novarossi settings=
Flush top and bottom needles.
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Old 08-03-2010, 11:35 AM   #8
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They are just trying to get you to a starting point. Once the engine has fired up and heated to its normal operating temps then you can tune it and get it running the way you want it to. But you can't tune it without it firing up. You can tune it no matter how the needles are set but you may damage the engine if its too rich or too lean. So a safe place to start is the factory settings which is evidentially flush on both hsn and lsn and go from there.
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Old 08-03-2010, 12:09 PM   #9
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Other than fouling glow plugs, what else are we damaging by running too rich? I'm getting worried, since I've always heard that running slightly rich is playing it safe. Is excess oil bad for engine life?
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Old 08-03-2010, 12:16 PM   #10
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I'm still trying to master tunning myself, but another thing to check before you start trying to get it running is your idle gap. If your idle gap is open to far the factory settings for your needles won't help any. Try to get your idle gap set to .5mm or a little over that.
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Old 08-03-2010, 12:17 PM   #11
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replace your carb o-ring if there, is a tear or if it just went bad it wont tune right at all and cause flameouts.
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Old 08-03-2010, 12:36 PM   #12
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Originally Posted by neobart View Post
Starting point on a Novarossi carb is flush or close to on both LSN and HSN.
I have a Novarossi N21BF. On mine, flush for the HSN is a good starting point, but if I were to set the LSN flush it would be WAAAAY too rich(definitely would not run).

For a ballpark LSN setting I turn the screw all the way in(while pulling the carb open slightly), then out 3 - 4 turns.

It's possible your engine has a different carb, but I just wanted to put that out there...
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Old 08-03-2010, 12:46 PM   #13
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Other than fouling glow plugs, what else are we damaging by running too rich? I'm getting worried, since I've always heard that running slightly rich is playing it safe. Is excess oil bad for engine life?

Too rich isn't really playing it safe, although it is safer than too lean. These engines run best when tuned right..not too lean, and not too rich, and that's how they'll perform the best, get better runtime and last the longest.

Running too rich, means it will be running too cool for the cylinder to expand properly causing your piston to slam into the taper of the sleeve, thereby shortening the life of your mill.
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Old 08-03-2010, 01:45 PM   #14
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Originally Posted by T$ View Post
I have a Novarossi N21BF. On mine, flush for the HSN is a good starting point, but if I were to set the LSN flush it would be WAAAAY too rich(definitely would not run).

For a ballpark LSN setting I turn the screw all the way in(while pulling the carb open slightly), then out 3 - 4 turns.

It's possible your engine has a different carb, but I just wanted to put that out there...
Might be possible, the Nova carb I have is the never type with the idle screw facing the cooling head when installed in a buggy(not Serpent).
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