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
Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
new to high end bikes: CRF450R maintenance
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: 1102507, member: 16241"] Overall the CRF450 engine has proven to be very reliable. The major weak points are the intake valves, valve springs, cam chain tensioner, and the water pump shaft, bearing & seals. The titanium intake valves tend to wear and get cupped from bouncing off the valve seat as the springs wear and lose seat pressure. The exhaust valves are made of an inexpensive grade of steel and get corroded from the deposits present in pump gas. The quality of the stock Honda head is good. The valve guides and seats are very hard and wear resistant , but the exhaust guides need to be checked for wear when you get a lot of hours on the engine. The exhaust rocker arm tends to wear the roller over time, and the cam bearings are also prone to wear if oil changes aren't done frequently. Both are easily replaceable and can be checked by simply turning the bearing or roller and feeling for notchy movement. If the fixed bearing on the cam is bad, then you have to replace the camshaft. Hot Cams makes both a Stage 1 & 2 cam which feature powerband changes with more low to mid-range (Stage 1) and more mid-range to top end (Stage 2) (about $150). Installing the 2004 and later Honda cam chain tensioner (about $45) is the standard fix for the tensioner and Kibblewhite Black Diamond valve train kit (about $325 for the parts) is the standard valve fix. The Kibblewhite kits include 4 stainless steel valves, 2-stage racing valve spring kit with titanium retainers. A fresh valve job along with the Kibblewhite kit gives you a pretty bulletproof valvetrain. With these minor changes the CRFs can last a very long time. My 2002 CRF is still going strong. [/QUOTE]
Verification
Which ocean is California closest to?
Post reply
Forums
Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
new to high end bikes: CRF450R maintenance
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