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YzRiDaZ

How fast is a 426f?

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Hey, I own a yz 426f 2001. Many people ask me how fast this bike is in mph. Does anyone have a answer to this? Thanks

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I have a 2000 YZ426 with a stock 14 tooth front sprocket and a 51 tooth rear sprocket. I weigh 225lbs. Had my GPS attached to handlebars when I opened her up on a back road to the tune of 73 Mph. My guess is a 426 could hit 80 Mph with stock gearing.

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79.2 tops both in Moab and Pikes Peak Hillclimb with stock gearing 14/49 on a 2000 model.

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My perspective is the 426 is not all that fast. Fast being a perception of speed to what you have previously experienced. I suppose it is fast for a dirt bike but not a motorcycle. My top speed on the 426 at El Mirage dry lake bed was 85 mph, tucked. I was only able to get it to 77 mph on a trail due to loss of traction in the rear on the loose stuff. All that was measured with a correctly configured Trail Tech. My 99 R1 has seen 182 mph on the 173 toll road and 156 at Willow Springs longest straight. Now if I put the R1 motor in the 426 frame I would have a FAST dirt bike. :)

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I have a 2001 with a trail tech computer and dual sport tires. My bike hit just over 90mph on a straight strech of pavement. I have 15/49 gearing (plus one in front) and I weigh 255lbs. Put a smaller guy on my bike and I bet it would brake 100 :)

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the only way a yz426 will do a 100 mph is being towed by a dragster.15\48 it hits rev limiter at 81mph.

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15/49 I hit just over 90 and ran out of road. I didn't hit the rev limiter.

And I said it MIGHT hit 100mph with a lighter rider.

Why do so many people have to be pesamistic? :)

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you need to recalibrate your speedo.what brand and size front tire do you have? what did you program as your wheel size on your trailtech?it is impossible for yz426 to go 90+mph with its stock transmission gears.to get even close to 90mph you would need 15\45 gearing.ive raced[on flat pavement]3 or 4 yz426's[with gearing from 13\49 to 15\48] with my wr.results are always the same. when they shift from 4th to 5th im shifting 3rd to 4th ,when they hit rev limiter im shifting into 5th.races are fairly close until i hit 4th gear thats when i slowly start pulling away by the time im shifting into 5th they have reached topspeed[somewhere between 77 to 81mph].top speed on bike with 15\48 gearing is 94mph. there is another way you might increase top speed of yz but i dont think it would make that much difference [2 or 3mph]switch to 17"rear wheel with low profile tire.

[ August 02, 2002: Message edited by: freestyle111 ]

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I have a 99 yz400f that is geared up a little and have a white bros pipe/ Msr low-coefficient skid plate / One Industries low-drag front number plate/ Michelin 10ply low profile tires and a Troy Lee disigns helmet with a chrome stabilizer fin. I have had my buddy who knows a guy that dated a girl who's mom was a stripper that danced at a club that was owned by a guy that had a hooker friend that had something to hold over a cops head have the cop radar me with his stigmatizing ultamating lasar gun, and he clocked me at 115 MPH on a paved road. The FUNNY thing is......I was only in 4th gear!(I must have thought that I was on my new 450f!) I was sooooo scared that I couldnt shift into 5th because my muffler bearings were wobbling so much!! :)

I would have hated to see what 5th would have done.

I am so glad that I had my chrome stabilizer on my TLD helmet!! I may have gotten whiplash! :D

My friend that has a 84' Honda ATC110 was clocked the same day by the same cop at 88mph and that is exactly what his speedo said.......so I know it IS right!

Just my $.04 :D

PS sorry forgot to tell you about my kryptonite splitfire spark plug that is proved to be dyno'd at an extra 3.56HP on the 400. That is probably good for at least an extra 6 or 7 MPH! :D

[ August 07, 2002: Message edited by: THUMPIN' ROCK HUCKER ]

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Originally posted by YamaMoto:

My perspective is the 426 is not all that fast. Fast being a perception of speed to what you have previously experienced. I suppose it is fast for a dirt bike but not a motorcycle. My top speed on the 426 at El Mirage dry lake bed was 85 mph, tucked. I was only able to get it to 77 mph on a trail due to loss of traction in the rear on the loose stuff. All that was measured with a correctly configured Trail Tech. My 99 R1 has seen 182 mph on the 173 toll road and 156 at Willow Springs longest straight. Now if I put the R1 motor in the 426 frame I would have a FAST dirt bike. :D

I used to think that my 426 was so fast! Then, I got hurt and couldn't ride for almost 5 months. In the meantime, I bought a streetbike. After ridding my streetbike for 3 months at 90mph everywhere I go and occasionaly hitting 130-150, when I started ridding my dirtbike again, I'm bummed because it feels so sloooow. I think I might need a KTM525sx...or a supercharger for my 426!

:):D:D

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Going fast on flat pavement on a street bike is a lot different than riding a dirt bike on tight, whooped, and rough terrain.

Just something to consider.

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Originally posted by yznvegas:

Going fast on flat pavement on a street bike is a lot different than riding a dirt bike on tight, whooped, and rough terrain.

Just something to consider.

Is that supposed to be rocket science?

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I was at Willow springs a couple of years ago and I past Barry Sheene on my 426, he was on his championship Suzuki. I went smokin past him in a two wheel drift cuz the knobbies dont bite the pavement well at 180. And man, if it wasnt for my Scott damper , I woulda died for sure, because I could feel the thing trying to headshake something fierce! Ole Bary walked over to me and was blown away. Kenny Roberts walked over and wanted to know my secrets, so he could get that rattle trap triple of his up to speed. It was a geat weekend. While leaving the park, I was loading my bike into the back of the space shuttle and.......

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my 426 will go fast enough to kill my ass if i'm not paying attention, that's all i know. no seriously i run 14/48 and i was riding on the pavement with cars the other day and on the section of road we were on the traffic travels 70+ mph. i had enough to haul ass past them and still had time before i hit my rev limiter. i figure with that gearing i have about 90+ at top speed. :):D

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85-95mph depending on gearing is realistic. An article I read by MXA I beleive about a year ago, slated the 426 at 89mph stock. The fastest bike was the Honda XR650R at 99mph. Anyone who says that their 426 is proven at 100 or above is on crack or dreaming. The only thing they got going over 100 is there fingers and mouths.

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Who the &*%$ cares?? The yz is a motocross bike. I have a new question. How well does the R1 take the whoops section? I also heard it is very tricky to seat hop on one.

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I saw on "you gotta see this" an R1 hit another bike that had rolled onto the course at about 130, and from what I saw, R1's dont do bumps. Not well anyway. The guy on the ground did better than the guy that hit his bike by far. The guy that hit the downed bike broke 21 bones I think. It was a huge get-off.

YZ+bumps= good

R1+bumps= bad

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