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Old 02-12-2012, 08:51 PM   #1
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Default Nitro 4 tec engine setting mess up

at the manual says the HSN 4 turns out from closed and the LSN is flush, the "flush" means I will screw in?

Please help
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Old 02-12-2012, 08:52 PM   #2
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flush means screw should be even with the inner ring.
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Old 02-12-2012, 08:53 PM   #3
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Yup what he said
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Old 02-12-2012, 08:54 PM   #4
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you mean no turn out from close?
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Old 02-12-2012, 08:58 PM   #5
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no..........if it is closed then it will be in furthur than the inner ring
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Old 02-12-2012, 09:01 PM   #6
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how many turns out from close that my LNS need?
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Old 02-12-2012, 09:04 PM   #7
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agian flush with the inner ring, dont know the number of turns, think its around 2 1/2
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Old 02-12-2012, 09:05 PM   #8
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easy way of doing it since you dont know what flush with inner ring means, Set idle gap thickness of a credit card then adjust LSN til it idles nice.
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Old 02-12-2012, 09:13 PM   #9
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done, I make my LSN screw in all the way and make the idle gap in 1 credit card thickness. what will i do next?
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Old 02-12-2012, 09:17 PM   #10
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ok....you cant screw the LSN all the way closed or you wont get any fuel....turn the LSN out 2 1/2 turns and set the idle gap at credit card thickness. Start the engine and adjust LSN till it idles nice. If idle is high then turn the LSN counter clockwise, if it idles low and dies then turn the LSN clockwise til it idles nice. Then after a few passes and engine is warm you can then adjust you HSN for maximum performance. Make sure you always have smoke trail from exhaust.
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Old 02-12-2012, 09:25 PM   #11
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okey dokey cdewalt1985 reply noted i will be back after a high speed run
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Old 02-12-2012, 09:25 PM   #12
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ok let us know how it goes.
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Old 02-12-2012, 11:41 PM   #13
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ow man its raining..
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Old 02-14-2012, 11:55 PM   #14
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im good now on the LSN, I need to adjust the HSN and when I pull the trigger to 1/4 the engine don't have a power, like a sudden lost of power.
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Old 02-15-2012, 01:22 AM   #15
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Quote:
Originally Posted by user6ix View Post
im good now on the LSN, I need to adjust the HSN and when I pull the trigger to 1/4 the engine don't have a power, like a sudden lost of power.
It's never a good thing to screw the needle into a seat.. This ultimately damages the needle or the seat/jet and makes the engine harder to the down the line.

Try this for a starting point:

1) Remove air filter and set your IDLE GAP to 1mm and while your there check the end points on the radio close it by pressing the break and when you full throttle it doesnt tug the carby off the engine.

2) Unwind the TOP needle, it doesnt really matter how much, as the LSN needle is what governs the idle and it's always good to know the HSN is allowing for fuel pressure

3) Remove your plug and clear the crank of residual fuel. If there's a lot of fuel continually misting from the engine then you know you are too rich on the LSN and it needs screwing in. Before you put your glow plug back in, check your glow plug is healthy and the glow starter is charged, if all good screw back in and attempt to start the engine.

You should at the first or second pull get it to fire, if it stops after that, then it's likely your LSN is rich, flooded and it's time to pull the glow plug and clear the crank and engine of residual fuel.

Turn the LSN inwards (clockwise 1/4 turn) and repeat this process until you can get the engine to idle without any throttle for 3-4 seconds. It will likely flame out as the engine is cold and it's best to fine tune the engine once it's nicely warmed up and this is done on track and when engine is under load.

4) By now you coan assume your idle mixture is relatively close to keeping it ruinning. Carefully give the engine a tiny bit of throttle ( 5% ) to warm it up, if it stalls you can turn in clockwise the HSN and try again. repeat this process until your engine is warmed up and you can put it down.

Once your idle mixture is set and you can throttle 50% without it stalling it's time to circulate under load and tune the HSN. For now ensure there's smoke
coming out of the pipe at all times. This doesnt mean there should be fuel spurting out, a good stream of combusted smoke is what we are after.

If you idle stays high once you are close to full throttle, then you may have to reduce the idle gap and chase it with the LSN

All the above is subject to:

Your engine being run in correctly
Using the correct fuel.
All engine components are secured well
Your engine having good compression
Your glow plug and starter in good health
No air leaks in the fuel line and tank
Exhaust gaskets are all in good check
And your bearings are sealed and in good condition.

Enjoy.

h
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