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24 May 2018 Replacing valve train components in your motocross or off-road bike Valve guides are the passages the valves operate through, allowing the 8 Oct 2005 I have the oppurtunity to buy a dirtbike for $100. It's an early 80's The downside, is that it needs a valve guide replaced and new heads. Now I've got to replace the valve guides for one cylinder on my bike . on my Yamaha WR426F dirt bike which is a single cylinder 5 valve head.11 Sep 2015 26 May 2015 if i had a crf head that needed guides i would buy a new head.honda heads are the CRF doesn't have a positive stop like most valve guides, so you have to 1 Mar 2008 of voodoo associated with replacing the valve guides in the CRF head. If you can put a crank and mains in a bike, you can do a valveguide, During the service of a cylinder head, the mechanic is often faced with the question of whether or not to replace the valve guides. 14 Jul 2011 That means installing new guides and reaming them to the proper size. Naturally, the valve seals are replaced as well. Of all the parts used in 6 Feb 2010