Are you lugging the engine with the side car ?. The more weight you have the more you would like to keep the engine rpm's higher. Your final drive gear ratio in the 1999 K1200LT is 2.75. I just sold a 2.91 gear ratio final drive to a member hear in Florida with a K1200LT side car and he likes it much better. If I had a side car I would use a 3.09 ratio.
