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
Technical & Mechanical Problems
Valve Theory 101
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="Fred W" data-source="post: 1307516" data-attributes="member: 3828"><p>If the clearances are set too wide then the valve lift and duration will be (slightly) reduced. This will slightly reduce the peak power available at high rpm, but as noted earlier can make the engine run smoother and stronger at lower rpms and mid range.</p><p></p><p>Too loose is a far safer situation, and valves on modern engines with shim under (hardened) bucket followers, like the FJR, tend to always wear in a way that reduces the clearances, which is one of the reasons why many folks will set their clearances to the wider end of the spec range. It also prolongs the need to re-shim, perhaps never requiring it again during the lifetime of the engine.</p></blockquote><p></p>
[QUOTE="Fred W, post: 1307516, member: 3828"] If the clearances are set too wide then the valve lift and duration will be (slightly) reduced. This will slightly reduce the peak power available at high rpm, but as noted earlier can make the engine run smoother and stronger at lower rpms and mid range. Too loose is a far safer situation, and valves on modern engines with shim under (hardened) bucket followers, like the FJR, tend to always wear in a way that reduces the clearances, which is one of the reasons why many folks will set their clearances to the wider end of the spec range. It also prolongs the need to re-shim, perhaps never requiring it again during the lifetime of the engine. [/QUOTE]
Insert quotes…
Verification
Post reply
FJR Motorcycle Forums
Technical & Mechanical Problems
Valve Theory 101
Top