The T- Bob won't affect how quickly a bike starts when cold.

 

Hi duncan,
I used to own an E6 BMW 2002 in Canada, so I am familiar with how ill-designed cooling systems can effect sub-zero cold starts (and warm ups for that matter!).
I also appreciate your theory on the extra drag a closed thermostat might cause on the water pump, and therefore motor, while it's cranking. In this case however I gotta agree with klx4 & linkin. A centrifugal style pump isn't going to cause the kind of resistance that would prevent the motor from firing, assuming the battery is properly charged.*
I am convinced the OP needs to consider the (lack of) fuel getting into the throttle body. Remember, his bike started fine after leaving it sit all winter, then refused to start the next day.

 

The HP requirements of a centrifugal pump are approximately 10% of the HP requirements of it running at designed flow, exactly opposite what was posted. They unload at low flow. That is at designed rpm.
At a 10% of design rpm, the HP requirements would essentially be zero.

 

Well said, and a couple edits made for clarification.

 

Thanks for the intelligent replies from all of you. I guess the only thing left for me to do is re-install the stock thermostat and see if any of the old hard start problems re-appear. Can't do the test for a few weeks but I'll report when completed.
By the way. This particular forum is the best Iv'e ever seen. You folks are smart. And generous. Imagine the hours this forum has put in on jetting. 17 screws to just remove the tank! THANK YOU ALL.

 

I got from the op his bike would spin over but not fast enough to start thats why I said battery. Sometimes after a winter they will just die if old. I wonder if he got his bike running. Hey Duncan If the T- bob works that well for you leave it as is, who knows but in my exeperience on a total cold start it wouldn't do much

 

linknl5: The T-Bob works great. But this is such a simple test. I can't resist. 3 small bolts hold the thermostat cover on. Remove cover, replace stock thermostat, replace cover and any lost coolant, let sit overnight. Next morning, see how it starts. I have this serious problem. When someone says ""Who Knows" my hand shoots into the air and I say " I'll find out." Always been that way. "If it's not broken, take it apart and find out why."