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I was using a dyno*** adjustable needle in my CV carb. I put this CVP needle in and wallah! Smooth and crisp throttle response! Something my bike has never had. Solid upgrade and made a HUGE difference over the dynojet needle.
Way better than grinding stock or shimming. With cam exhaust breather runs better than FI, no flat spots etc.
Works excellent no more carb pops.
Best CV needle out there, bar none. The old Sportster needle trick worked fine years ago when there were really no other alternatives. Now, I won't use any other needle in my CV's except this one from CVP. It's that good.
I always had trouble with lean carb issues in cool weather. even with jet changes, bike would run good all summer, but soon as cool weather, it would stumble. changing to the velocity needle fixed all that. Spark plugs have better color now too, bike runs good at all RPM. Try it, its easier than shimming the stock needle,change it and your done.