2019-06-29 Stumble of Idle KrZy8

KrZy8 has developed a pretty significant stumble off idle, but not all the time! Seems more prevalent when hot.

significant stumble off idle

as in I've stalled it several times now, once placing me in a less than ideal traffic situation.

Several summers ago, she ran very bad, even quit running all together at the Yosemite run Tyler put on. KrZy8 died at park entrance. After cooling down, she started and I made it back to hotel.

Quick diagnosis, fixed what I thought was fuel cap problem (not venting) then rode with PanMan and Niehart and Loud Jeff IIRC.

Of course, PanMan put on a freaking goat trail a KLR 650 wouldn't even like, it was hot and slow going.. and KrZy8 was throwing conniption fits. I rode ahead of the pack at a slightly faster pace to provide more cooling and even coasted downhill when possible.

Reading the mighty FJR forum, all indications were that the TPS was heat soaking and failing, sending the ECU into fuel mixture crisis.

Replaced said TPS with new. All has been good till now. Symptom is ONLY right off idle! 

Facts

• Did valve adjustment about 5k ago, she ran freaking GREAT until now
  • New plugs, filters, heavy maintenance
  • New TPS. I didn't get the EXACT TPS numbers per the book, IIRC they were off by about 5 or so. Will check again later.
• 35 - 47 mpg which is normal data for KrZy8 depending upon rider friskiness,  weather, and fuel.
• Only run top-grade fuel. Chevron regular.

Plan of Action

• Check air box for mice activity
• Check compression
• Do Leak Down test
•  Get TPS numbers
• Replace injectors. I have 4 matched spare injectors at the ready. They were the '2nd' best set of 4 as worked on by RC Engineering. 
• Take KrZy8 out back and shoot the bitch! :whistle:

So, before doing all this thought I'd post up and see what all of y'all think the POA should be.

Any ideas, oh great collective?

This bike HAS to make 250k miles before I either part her out or shoot her or whatever!

Thanks in Advance,

dcarver