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Johnnyv04 yz450f

Yz450f must do mods for the trails.

17 posts in this topic

I just bought my 04 yz 450f. I've gone through most of the previous discussions on TT but have a few questions...

I want my bike setup up for trails, I plan on changing the chain and sprocket. does 13/51 sound good? Is there a recommended brand for woods?

From what I have read a heavier flywheel is a must for the woods, can I add the weight to the stock one, or will that cause me problems? If I can add the weight should I get 10oz or 13oz?

Do I need a bigger aftermarket water pump?

The rekluse set up is so expensive, is that a must???

Thanks for your help, I'm knew to TT so I hope I put this in the right spot

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The only "must" is suspension.  From there, everything is all preference.

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The '04 is a horrible woods choice, it's got a 4 speed gear box. I had one and tried to make it woods friendly, it was terrible. You could either gear it for technical riding which would give you a top speed of around 35-40, or gear it for more open terrain which put first gear around 20 mph.

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I had a 03 yz 450f, it was a monster for trail riding, but I loved it. I geared mine a little taller than stock to tame the hit, and added a flywheel weight. It really smoothed it out and made it much easier to ride, however as was mentioned before, it had a very tall 1st gear. I think the ultimate would be to add a wr 5 speed and a flywheel weight. Of course the right springs and suspension first and foremost.

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What front and rear sprocket size did you use for your 03??

  Front sprocket was 14 (stock I think) and the rear was 47, only 1 tooth higher than stock.  I originally tried 14/50 to use for trail riding, which worked great for low speed but the hit was brutal for me (older wuss) on an already brutal machine.  I tried the 47 rear first and it helped a bunch, then I installed the flywheel weight and together it was awesome!  The 03-05 4 speeds were more like having 1st gear removed instead 5th gear compared to a normal 5 speed.

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I went with the heaviest weight that Steahly made for the 03 yz450, I think it was a 13 Oz. but I can't remember for sure. It made a huge improvement for trail riding.

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I still own an 03 and love it in the trails. I ride really tight trails so mines geared at 12 49 and it works great on tight or open trails

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Ive also only overheated mine once when i was stuck in the mud. So unless the trails your on are tighter than mine which i highly doubt you should be good to go

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