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This day I tried a 990 carb, but I only got 5 seconds fired on elevation. I have tried in my house and it's fired just fine with stock needle settings out from the packaging. Does it need to adjust the needle again?
Tyo
Yes, you are correct, I'm on altitude. But my engine is stock KM one the only upgrade I have made, Dom V2 silenced and this 990 carb. Oh, and the exhaust got 'shoot' (I don't know what it's called, backfired maybe)GENERALLY the default setting for ALL Walbro (-type as well) carbs is 1 1/4 LOW, 1 3/8 HIGH.
To determine this, simply perform as per nitro carbs - screw in GENTLY, don't force it, until it stops, then UNSCREW (CCW) to the stated values.
Stock engines tend to need LESS fuel, so these settings may be rich.
Similarly an altitude effect may require a leaner setting, if I read your message correctly, but only consider SMALL changes, perhaps 1/32 at a go.
There are plenty of tuning videos, and threads.
There's a nice SIMPLE tuning video set-up by Trip, which should be easy to find.
All engines and carbs are very slightly different, so they will vary.
As with 1:1, let a brand new engine run slightly rich for a couple of tanks before tuning - leaning and optimising - and considering full throttle.
Al.
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