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They are power restrictive? That seems kind of odd. Wouldn't you have people doing carb swaps if that was the case. I thought cv's we're just a more accurately fuel delivering system. Since the you up in the butterfly the draw the engine actually pulls up the diaphragm the diaphragm is really...

So I just wanted to give an update. I was tuning the other day and decided to go lean my main jet out and overall. I wound up at 105's main and needle on position 2. Runs nice and brown plugs. If anyone find's this thread I have the mikes xs400 performance carbs. Bought in 2018.

Super sorry yes really poor wording on my part and got ahead of my self. Yes exactly that. The markings were for needle diagnosis. Thanks for the correction. Wouldn't CV carbs just take a little longer to get to wide open? I mean when you open the throttle its just a gradual increase of fuel...

It's your carbs. They are out of sync now because you took them apart and flow between the two cylenders are off.

Couple things. Look up mc garage on youtube and they have videos that explain all about a carb and the parts. They talk about how to tune each system. Watch them a couple times and follow along when you're ready to work on it. When you get to main jet tuning mark your throttle position 1/16 to...

Got the valves and all that. You cant sync these due to there is no port on them and the boots don't have any either. I got a 130 and then ran it. Bog after 1/2 throttle. Then lowered the needle to middle position and its now holding strong and im getting a bit of grey on the plugs (would be...

Thanks for the info. Yea I have had a hell of a time trying to troubleshoot these thinks. I had a bad jetblock gasket and that caused a rich symptom I have the idle down just fine and now am trying to get the main. if your at the furthest out on a clip on either side you should go to a different...

BTW. How does it feel when you hit 70mph? is it wrapped out or does it have a good amount of power at high end?

Hmm. I have been reading all over that these things are crap and I have been trying to deal with mine. I would have just got some cv's or some other carbs if I didn't get these with the bike. I am running a completely dropped down needle and a 145 main with a 40 for the pilot. I road around for...

So your liking the 120? These come come with a set of 100, 110, and 120's. What do your plugs look like or what are you basing the performance off of? Do you have a sniffer or are you plug chopping?