Leopard hi-speed needle...where's yours?

Chip Durham · Joined: 29 Aug 2003 Posts: 49

I know the exact position will vary according to many factors, but the manual says start at 1 1/2 open, and someone else I know said 1/2 to 3/4...

What have you found?

scott bertken · Posted: Sun Feb 15, 2004 8:11 pm Post subject:

7/8 OPEN

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scott bertken going fast is fun and winning is funner........next time you think your perfect try walking on water

tim finley · Posted: Sun Feb 15, 2004 8:46 pm Post subject:

Chip,

It depends on the air. Sometimes it will be 7/8th open, sometimes 1 1/4 open. Do you have exhaust gas temp on your gauge? If so, lean or richen your needles so that as your rpms are going up, so is your egt. peek at about 1100 degrees. You will be about spot on then.

If both your rpms and egt are going up and suddenly only the egt starts to drop, quickly choke the motor by covering the inlet holes on the airbox. This could save your motor. Then imediatly richin the high speed jet.
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KGB/motori/#77

Cooper Cook · Posted: Sun Feb 15, 2004 9:20 pm Post subject:

Tim, how far away is your probe from the piston?

tim finley · Posted: Sun Feb 15, 2004 11:50 pm Post subject:

Chris,

The probe is 6 inches from the piston. When you install it, make sure you leave yourself slack or when you adjust your chain tension you can break the probe and they are expensive.
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KGB/motori/#77

Chip Durham · Joined: 29 Aug 2003 Posts: 49

tim finley · Posted: Mon Feb 16, 2004 6:16 pm Post subject:

Yes, they would read higher. How much, I am not certain. If you run your egt at 1150 I would say you should be safe but check with russel racing to make sure. They may tell you that 1200 is good based on the position of the probe on your kart.

The best way to tell if everything is okay is to download your data and compare the rpm line to the egt line. As long as both rise and fall together at the same slope you should not be lean. Watch for any unusal spikes or changes in direction by the egt line that does not follow the rpm rise and fall. If the lines are following each other nicely, the question is, are you running fat because you don't have enough egt?
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tim finley · Posted: Mon Feb 16, 2004 6:19 pm Post subject:

Let me restate something. If you see drops in egt while the rpms are rising, this could be mean your engine is detonating which is generally a prelude to sticking or things worse. This condition usally means your mixture is lean.
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KGB/motori/#77

Chip Durham · Joined: 29 Aug 2003 Posts: 49

Axel Korn · Posted: Mon Feb 16, 2004 9:34 pm Post subject:

tim finley · Posted: Thu Feb 19, 2004 7:14 pm Post subject:

Thats a good question Axcel. I generally run them approximetly the same, but do not generally go below 1 on the low speed unless the air is really bad. At some point some of the leopard drivers at our club have run 3/4 to 7/8 on the high needle and low.

Without egt I would not venture into anywhere near 3/4 on any needle Shocked

.
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KGB/motori/#77