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
Honda MX & Off-Road Dirt Bikes
2007 Final Year of Honda CR Line 2 Strokes
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: 1102472, member: 16241"] The original 1998 YZ400F was built with steel valves and was in many ways overbuilt for a race bike. The result was a bike that was a bit overweight and other than a few first year teething problems was stone reliable. The maintenance requirements were simple and it probably set an unrealistic expectation for things to come. As the bikes evolved we got a much higher level of performance. Along with that performance came more radical cam timing and lighter parts to survive the new levels of valve acceleration employed. Pistons got even lighter and lost a compression ring in the process to reduce frictional losses at high rpm. Specific output reached unprecendented levels, and in exchange for this amazing increase in performance we also got shorter maintenance intervals that can't be trifled with. Was it worth it? It's hard to deny how good the bikes have gotten compared to the 98 YZF, but that performance has come at a definite cost. People who feel the OEM service intervals are a scam to sell parts often find out the hard way how short sighted that thinking can be. It appears that Honda built the new CRF150R with steel valves which would imply more conservative valve timing than they could have used, and maybe a nod to reliability as a higher priority. I guess it remains to be seen what the future holds. I have a CRF150R coming from Service Honda that I'll be ripping apart to see if some of the important questions can be answered before people start breaking parts. Stay tuned, it should be interesting. ;) [/QUOTE]
Verification
Which ocean is California closest to?
Post reply
Forums
Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
2007 Final Year of Honda CR Line 2 Strokes
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