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fmv60691

Valve Issues on YZF's 450?

10 posts in this topic

Hello everyone:

I have always been a CRF 450 owner, and not yet have had any valve issue, anyway I take care of them every 25-30 hours. But I heard YZF's 450 were much more reliable and didn't need that much manteinance, oil as well... and were much more reliable in general......

I also have to say I heard the complete opposite story, plus much more expensive and difficult to find components for YZF's and five valves instead of four!!

I am planning to swsitch but not sure, please give me your views!!

thanks a lot !!

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It's true. The heads are more expensive, and the valves are more expensive. But they're easy to find if you order in advance. Not many people stock them because not many people buy them.

You see, my '03 has yet to actually require its first valve adjustment, and it's not unusual in that regard. I keep checking, but they're still in spec. I may have to do the rings before the valve clearance goes out.

I change the oil every 3 ride days unless there's a race involved. Works out to something less than 10 hours, normally.

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i've got just over 100 hours on the old hour meter on my 05 and they haven't moved at all, still looks like brand new.

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You see, my '03 has yet to actually require its first valve adjustment, and it's not unusual in that regard. I keep checking, but they're still in spec. I may have to do the rings before the valve clearance goes out.

I change the oil every 3 ride days unless there's a race involved. Works out to something less than 10 hours, normally.

Same for me. My topend is still in spec. Other than the oil and air filter changes its pretty carefree.

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Yup what moto and gray said is dead on. And yes their are 3 intake valves and 2 exhaust valves (didn't know it was different on the crfs?). As long as you do your maintenance it will be an awesome bike... I suggest you getting one!

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I have an 04 and im not sure how many hours are on it, 100+ i'm sure. I checked maybe 20 hours ago and they were still in spec. The previous owner abused the bike. I ride in the dunes a bit and clean the air filter every ride, and the oil every 4 hours. I'm not sure about you guys but i'm not worried about my valves, my bike starts first kick everytime (2 twist of full throttle, kick vrooom pop!!!) I can also start my bike with my hand, not that that matters. I will probably replace the timing chain soon though. I bought the yzf over the crf for 1 reason, and that is reliability. :ride:

On a side note, if this 4 stroker blows up and cost a lot of money i'm going back to 2 strokes though.

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I have a problem getting valve shims. No Yamaha shop here stocks them!

Just goes to show how reliable they really are.

The Honda shop always seems to have them, and in half sizes too.

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