Forums
New posts
Search forums
What's new
New posts
New media
New media comments
Latest activity
Media
New media
New comments
Search media
Members
Registered members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
FJR Motorcycle Forums
FJR Specific Discussion
Engine Didn't Grenade/Something Happened/And Final Report
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
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="RBEmerson" data-source="post: 1412114" data-attributes="member: 91458"><p>Having lunched a C10 after trying to start it one morning. Not even a full crank rev and BANG! The culprit was a cylinder full of fuel. The cause was a mix of "user error" and a less than effective tank valve. This is/was a known problem. Although engine vacuum was supposed to get fuel flowing, the petcock didn't always close. Which mean fuel drained into the motor, found its way into a cylinder. Hitting the starter and trying to compressible fluid had obvious consequences,</p><p></p><p>User error = trusting the "automatic" petcock valve.</p><p></p><p>How fuel drained into a cylinder escapes me, but it did. As I said, C10's were known to do this.. That is, this wasn't an isolated event.</p><p></p><p>So - that the motor wouldn't crank if there was fuel in #2 is no surprise. What does surprise me is a cylinder full of fuel didn't bend a rod or worse. And, of course, how did the cylinder fill while the motor ran? Possibly/probably the cylinder wasn't full, and maybe a valve was open, avoiding hydraulic death. But then, why was it there after returning home? Passing the leakdown test explains why fuel didn't trickle into the oil (too bad no one sniffed the oil and strained the some oil through a coffee filter.)</p><p></p><p>Not to rain on the parade but... I won't be surprised to hear the motor eventually crunched. With no explanation for the mystery of fuel accumulated where it shoudn't, I wouldn't plan on riding across Death Valley.</p></blockquote><p></p>
[QUOTE="RBEmerson, post: 1412114, member: 91458"] Having lunched a C10 after trying to start it one morning. Not even a full crank rev and BANG! The culprit was a cylinder full of fuel. The cause was a mix of "user error" and a less than effective tank valve. This is/was a known problem. Although engine vacuum was supposed to get fuel flowing, the petcock didn't always close. Which mean fuel drained into the motor, found its way into a cylinder. Hitting the starter and trying to compressible fluid had obvious consequences, User error = trusting the "automatic" petcock valve. How fuel drained into a cylinder escapes me, but it did. As I said, C10's were known to do this.. That is, this wasn't an isolated event. So - that the motor wouldn't crank if there was fuel in #2 is no surprise. What does surprise me is a cylinder full of fuel didn't bend a rod or worse. And, of course, how did the cylinder fill while the motor ran? Possibly/probably the cylinder wasn't full, and maybe a valve was open, avoiding hydraulic death. But then, why was it there after returning home? Passing the leakdown test explains why fuel didn't trickle into the oil (too bad no one sniffed the oil and strained the some oil through a coffee filter.) Not to rain on the parade but... I won't be surprised to hear the motor eventually crunched. With no explanation for the mystery of fuel accumulated where it shoudn't, I wouldn't plan on riding across Death Valley. [/QUOTE]
Insert quotes…
Verification
Post reply
FJR Motorcycle Forums
FJR Specific Discussion
Engine Didn't Grenade/Something Happened/And Final Report
Top