Reply to thread

Help Support Yamaha FJR Motorcycle Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

Message: <blockquote data-quote="jchrisk" data-source="post: 1362592" data-attributes="member: 90588">I finally had a chance to take a look at the spark plugs. I pulled each one in turn; I first pulled the cap off and inserted a spare plug. I cranked the engine and looked for a good spark. Then I pulled the installed plug out of the engine, cleaned, checked the spacing and re-installed. I made sure each cap had a good, strong fitting over the plug when re-installed. All four wires produced a good spark (on one I had to trim a bit of the wire back at the cap first - it looked a bit corroded). The plugs themselves were a bit wet with a black film; it cleaned up easily with a rag before re-installing. I don't know if that is from flooding - I certainly have cranked the engine enough that its going to flood, or if it indicates a bigger problem. Surprised it was dark.All that done, cranked the engine with WOT. Still same exact problem.A couple other notes: It would never fire up with WOT. But it did when I let go of the throttle into normal position and cranked it. On a few occasions, it would fire up and run smoothly for 10 seconds at 2k RPM. Then stall. Each time, if I applied any throttle whatsoever, it would stall immediately.I'm at a loss. Seems like a fuel starvation problem (the stalling after a smooth run of 5 - 10 seconds), though pump seems to be providing a clean feed of gas. The TPS seems okay in diagnostic mode (clean readings from 17 - 100 as I rotated the throttle), if that means anything.Any thoughts on next step?    (like, take it to the shop <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> )</blockquote>

Verification