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hey, my formula 3 600 has a low end bog, first when u start her though 4 the first 10 seconds she sounds fine then she seems to get loded up with fuel and has no throttal responce. i blow a lot of plugs as well , i'v been told to get her syncranized ,,any info would help
 

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Sounds like it's just running rich. Clean and sync the carbs. Then make sure the air screw is adjusted properly. Has the sled run good in the past and just started doing this recently? If so, the the carbs are most likely just dirty. Other causes could be a bad carb float or worn needle or seat. Clean, inspect, and adjust them first, then move on to replacing parts.

It looks like you have 36mm Mikuni VM Round Slide carbs... here is the round slide manual:
http://www.mikuni.com/pdf/vmmanual.pdf

Round slide cleaning video tutorial:
http://www.mxsquid.com/carb.html
 

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Mine eats alot of plugs as well. I've had my local mechanic look at it, as well as the dealer look at it, neither found anything wrong...

No low end power does sound like an issue though. Perhaps it could be jetted wrong. Could just as well clean the carbs as well.
 
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