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Need your advise on fcr jetting

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Hello guys,

I ride a lc4 400 sm. Current carb settings:




pilot jet:48

FS: 2 turns out

Ride at sea level and the weather is still hot (summer)

Other mods: Akra full system & K&N airfilter fitted in the stock airbox with some mods (open top)

Problem: The bike runs fine,idles fine and the sparkplug colour is right.

I notice however a small burbling when a open the throttle quickly, mainly from the 3rd gear and up.

If i turn the fs at 1 & 1/2 turns it gets worse - if a turn it over 2 turns the bike idles very bad. So i think that this is not the case. I went to 165 main from 160, nothing.

I am thinking of setting the needle to #3, but i am not sure if this is the problem's base.

Any suggestions?

Thank you

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