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Power/Speed Issues

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Hello everyone, I have a 2006 CRF450R that I bought used about a year ago and have been having a lot of fun with. However my friend recently got a CRF450X and I have noticed that he is at least twice as fast as I am. Even when we switch bikes his is much faster so I know it only has a little to do with skill. Also if I give it to much gas it tends to backfire.

Any help would be great!

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The transmissions are geared different between the R and the X. I compared the gearing on the 250's (CRF250R vs CRF250X) and I found that the 1st gear was lower in the X, 2nd gear was the same and the X would be geared higher in every gear 3rd and up. They are really made for 2 different applications. I would rather have an R on the track, but an X on an old dirt road. I'll bet if you dig into it, the gearing comparison would be similar on the 450's

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Faster in what type of trail situation?? Road and fast 2 track? THe X does have the topend gearing to help with high speeds. But in the trail I would say it all rider. I have now issues with any X or Wr when in the tighter trails with my R. But the rider deffinatley make the diff.

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Also sounds like you have a jetting or valve issue?? It shouldnt backfire if you give it a hand full of gas?? Only lift the front tire and go faster!

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How big is your friend? AT 265lbs, you could be over 100 pounds heavier and that's going to show....especially when you haven't ridden in 30+ years.

Ya left those details out...

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In what way are you topping out at 55? Gearing, as in the 5th gear, against the rev-limiter 55?

Or, you're full throttle, 3rd gear and she just stops pulling around 55? A standard 450 engine puts out enough power to theoretically pull the bike to around 110-120 MPH.

Sounds like you are very lean.

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The X has a wide ratio transmission, the R does not. Your top speed will vary greatly depending on sprocket gearing. Sounds like you also need to clean & tune your carby to get it running proply.

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Wow, I have not had the time to check this thread thanks for the great responses. 55 is 5th gear 3 quarters open. Full open I get the backfiring issue. I have thought about checking the valve clearance but didnt think about the carb at all.

I know a portion of it is that I am a new rider and still a little shy about cranking it open, however my dad just purchased an 04 kawasaki 300r and his can kick my a$$.

Anyway I will try this out!

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