I took my '99 FE501 out for a mileage test last weekend, and I did 59 miles per gallon averaging 50 mph. It was around 50F temps. My motor at those speeds was averaging between 113F - 116F. At those cold temps, it felt rich, and down on power. I'd sit for 5 minutes at idle to get it up to 175F, and of course, it was more responsive, and happier. It needs a thermostat (for at least 160F). Is there any kind of thermostat that can be installed? Maybe one that goes "in-line"?