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Yamaha MX & Off-Road Dirt Bikes
03 Yamaha WR250 - dropped valve
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[QUOTE="Mudd Slinger, post: 1376494, member: 53782"] Joe, I read the link you suggested and seen it before but could not find it when I searched. Thanks for the link. I talked to Jesse Williams yesterday and listened to what he had to say and ask a lot of questions. I was a reliability engineering technician (mainly electronics) in the military hardware world for years and have some limited knowledge on metallurgy based on the reliability issues I worked (typically pulled in more knowledgable people than me to solve the issue). I was very suspicious of the dimpled TI valve being a reliability issue and compromising valve reliability (not going there). I agree with the theory of the dimples being a possible long term reliability issues (would like to know how dimples were formed) and question flow enhancement characteristics (golf ball theory) inside a head. I was more curouis of the stainles steel valves vrs TI, the added weight to the valve train, cam wear, guide wear, seat wear, etc. (with the upgraded spring kit). Intutively I was thinking it could be more reliability but was worried about the added weight of the SS valve and the added spring tension for the heavier valves (head not designed for added weight and springs?). I am not a mechanical engineer but know enough that I don't trust intution, just hard data and good data analysis. I am hoping to hear some ideas from some of you more experienced engine builders (learn from your experiences and of course, mistakes - be honest). I will keep researching, learning, and processing data. YZ Teacher, I have been doing price comparasions. I will compare bike bandit prices with the other price info I gathered. Thanks for the info. I would also like to talk to Eric Gore yet but their list prices for completed performance heads seem a little high for me. Reliability, no job, and small bank account are my primary concerns right now but I would like to get a little performance boost if possible. What are faction valves? I was reading on some other posts that I may be able to go with a later year head and piston (if they both need replaced and head cannot be reworked) to get a little performance boost. Is this true in your experience? Rich, any experienced input? "I am an old woods racer that is slightly beat up and out of shape but still happy to be able to do some trail riding. I still love the power of a high performance bike, just too poor to have one, so I have to make it cost efficienctly." [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
03 Yamaha WR250 - dropped valve
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