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I have a 1996 SLX 780 that runs great overall (58-60mph), but bogs when cold. I have to tap the throtle to get it going. Once I am past this "cold natured" problem it runs perfectly all day long.

Am at a lost for what could be causing this. My compression ratio is 145 to 150 across the cylinders. Have checked everything fuel related, to no avail. This problem just appeared one day without any external problem issues (roll-over, etc). All fluids are fresh. Run 93 octane and Yamalube tw3 2m.
 
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