Guess I'm lucky it broke BEFORE the trip!
It literally broke one block away from home, but I was able to ride it into the garage. No, this is not another "M8 engines suck" thread. The issue isn't MoCo's; it's mine. I was set to leave for the Rockies in exactly one week, so I am fortunate that I wasn't there when this happened. Here's the situation: My bike is tuned with the PV-2 in accordance with my mods. I did three auto-tune sessions to get it dialed in after the header was installed last year. The bike has always performed strong and ran flawlessly. I had an occasional but rare detonation knock only when blipping the throttle slightly from idle, like before accelerating. I modified the tune slightly to overcome this, and it's been fine up until yesterday after 80 miles of high-speed riding on the interstate.
One blip, one sharp and loud detonation event, then it stalled. Started hard with a misfire. Uh-oh. I believe I hear compression leaking into the exhaust. Best case: broke a spark plug and the perceived compression noise in the exhaust is imaginary. Not likely. Worst case and more probable: broken compression ring and/or piston. If it's the latter, I guess I'll be talking to our friends at Fuel Moto about their 120 big bore kit. I was going to do it down the road anyway, so I guess this might be fate telling me to go big or go home early. I'll report back after I have some time to diagnose. Maybe I'll get lucky and one of the compression release solenoids stuck open. :icon_mrgreen: |
You have my best wishes, you certainly have great attitude! |
Originally Posted by Fullbore55
(Post 17572761)
You have my best wishes, you certainly have great attitude! |
Originally Posted by strych9
(Post 17572807)
Thanks. I've moved past the 'acceptance' stage. Now I have to focus on determining the cause and getting it back on the road. I knew the risk when I tuned it; now I have to walk the walk and take it in stride.
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Originally Posted by strych9
(Post 17572807)
Thanks. I've moved past the 'acceptance' stage. Now I have to focus on determining the cause and getting it back on the road. I knew the risk when I tuned it; now I have to walk the walk and take it in stride.
And that is how it’s supposed to be. I have cam tools and the factory service manual. I can loan them to you or take pics of pages, if needed... let me know if I can help. |
Just a quick thought. You can turn off your compression releases with the PV and do a compression test to see which cylinder is the issue. |
Hope you figure out what you screwed up, Might still be able to make the trip but it will be a little shorter.
Add: Any changes you make to your bike should not be just before a trip. Put at least 100 miles on it. |
Hope your problems a small one. I also really respect your attitude on it.
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Hoping for an easy fix strych9.
Curious to see what you find. |
Originally Posted by cmashark
(Post 17574625)
And that is how it’s supposed to be. I have cam tools and the factory service manual. I can loan them to you or take pics of pages, if needed... let me know if I can help.
Originally Posted by cmashark
(Post 17574641)
Just a quick thought. You can turn off your compression releases with the PV and do a compression test to see which cylinder is the issue. |
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