Home
Basic Dirt Bike How-To's - Video
Dirt Bike How-To's - Video
Living The Moto Life - Video
Bike Tests | Shoot-Outs - Video
Forums
What's new
Latest activity
Log-In
Join
What's new
Menu
Log-In
Join
Navigation
Install the app
Install
More options
Close Menu
Forums
MX, SX & Off-Road Discussions
General Moto | Off-Topic Posts
need some help from you guys
Reply to thread
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
.
Message
[QUOTE="Rich Rohrich, post: 1244001, member: 16241"] WRONGO Junior!! A CRF250 and the current crop of high rpm MX engines are [b]exactly[/b] the type of engines that require a Serdi machine or the equivalent to cut the valves seats concentric with the valve guides. At 13,500 rpm .002" of excess runout on the seat is the difference between valves lasting 10 hours or 100 hours. Worst case if the seat is bad enough the valve head can break off and drop into the engine. Ask anyone who owned and RMZ250 with bad seats from the factory how much fun that is. Shaw - Even after 30 years of doing this stuff, that thought still keeps me awake at night. Eric has always made fun of me for how slow and anal I am when working on the critical stuff like cylinder heads. I'm not going to let anyone get hurt as a result of MY work. :cool: [/QUOTE]
Verification
Which ocean is California closest to?
Post reply
Forums
MX, SX & Off-Road Discussions
General Moto | Off-Topic Posts
need some help from you guys
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top
Bottom