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“The bad side of modern titanium valves is that they stretch. You have to keep a eye on them and replace them often or go to stainless steel ones…” “Check any dirt bike valves at the first ten to fifteen hours of operation. If you can make 20 hours consider yourself lucky…” to say about a fix for your race engined four-stroke dirt bike. DI: Why are titanium valves a good thing and a bad thing? Teddy: The good side of titanium valves are that they are lightweight, they turn lots of rpm and that’s they key of a ti valve; they’re trying to make DIRT ILLustrated \\\\\\ April 2013 + Page 42 like a Formula One car engine, basically lightening up that top end so the thing turns more rpm the whole motor in gen- eral. The bad side of the ti is that they stretch and keep stretch- ing and stretching, they don’t break like a steel valve would. Steel will break and titanium will stretch. So what I do to fix this for the majority of the av- erage Joe with four-strokes is to go in there and replace them with the ti and put in stain- less Kibblewhite valves that are made here, not out of the country. They’ve got a great name for their valves, they made them in the old days of flat track bikes, they started out doing Nortons, Triumphs, etc. Now there’s a big market for dirt bike valves so they got into it. They make a really cool stainless two loop valve that’s got lots of strength, doesn’t stretch, doesn’t snap and is pretty much bullet-proof. So if it’s a guy who is racing and has to have the ti valve, I’ll run the ti valve if he has a lot of mon- ey. The price is so much differ- ent as far as titanium vs steel. It’s an astronomical difference. The retail price of a ti valve, say an RMZ CR and this is an OE valve I’m talking about,