Sounds like it could be a main jet issue, make sure it is clean and the correct size. remove the 4 bolts on the bottom of the carb to gain access.. Also make sure your air filter is clean, blow it out from the inside of the filter out. and wash the pre-filter.
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2005 SP 700
2004.5 SP 500
1999 Yamaha Beartracker 250 2x4
2001 RMK 800 144"
2000 RMK 600 136" Boysen Reeds, SLP Twin Pipes, SLP Boost Bottle
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