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Joined: Apr 11, 2016 7:54:29 GMT -5
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Post by kjreel on Apr 11, 2016 8:02:42 GMT -5
I have a 30mm CVK, free flow filter, bigger valve and port head, 30mm intake. power is perfect everywhere except the idle is junk. mixture screw has to be backed out 5 and a half turns to start. the idle screw is backed off completely. at 5 and a half turns if i go any further the idle will continue to go up until the screw just comes out. Im new to CVK carbs but im assuming that means I need a bigger pilot. Any tips or comments would be greatly appreciated thanks!
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Post by lain on Apr 18, 2016 5:59:06 GMT -5
The mix screw shouldn't be out that far, default starting point for tuning is 2.5 turns and usually only a half to a full turn max either way is where you would tune it to. Tuning CVK is just like every other carb, you just need a rudimentary understanding of what's going on inside of them and they are all very easy to tune. The idle speed screw turns variate from one scoot to the next, but entirely out or entirely in is usually not a good setting.
You may also have a dirty carb if that's the only way you can get it to run. Idle jet wouldn't be that far off anyways unless it was the wrong jet and installed after factory. Every scoot I've taken apart (dozens) has had between 34 and 37 idle jet, in most cases #35, but that is a very tiny range.
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Post by crawford on Apr 18, 2016 11:11:43 GMT -5
I would look for vacuum leaks
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