WHOA YZ450F 39 inch seat height!

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#1
I was thinking about getting a YZ450F since it has such a good reputation but 39 inch tall seight! I'm only 5'6 and I dont even think I will be on my toes on this thing. Getting the seat lowered would be expensive too. Anyone own one or can tell bout this???
 

Jaybird

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#2
Lowering is cheap.
Take off the seat cover and cut down the foam. An electric knife or a hacksaw even. I like a 4.5" angle grinder (messy). Replace the cover.

You can also modify (slot) the holes in the subframe connections to get a bit lower.

If that fails, you can have a shock tuner add a spacer to the shock rebound.
(You probably won't need this after you do the other things)

DO NOT raise your forks in the clamps to lower the bike.
Also, make sure that the suspension springs are proper for your weight and you have good sag prior to doing any changes.
 

biglou

#3
FYI-There's not much seat to cut on the blue 450. The profile is much thinner than on the 400/426. I've read complaints that people can even feel the subframe through the seat in their butts.
 

nikki

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#6
I'm 5'5" and do fine with my 250F height wise (totally stock suspension, stock clickers, stock fork position, etc). I'm gonna put a tape measure on it this weekend to measure the true seat height. Reason I say that is I measured my friend's CRF 250 seat height to be 37.5" over the pegs and my 250F feels like it sits a tiny bit lower.
 

holeshot

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#7
I was bouncing back and forth between all three 250 four strokes (Kawasuki, Honda, Yamaha) on the local dealer's showroom floor. (I didn't actually ride them ;) ), thinking that the Yamaha would be the tallest. Using the very unscientific "how far does the seat come up to my pocket when I'm standing beside it" method, I'd be surprised if the seat height on all three bikes varied more that 1/8" of an inch. Actual feel when riding them may be somewhat different (the thin Yamaha seat won't compress as much).

Things must be different this year, because I could have picked a CRF250 (if I were on the market for new bike) right then and there, instead of the usual "you are #62 on the waiting list and will pay a $1500 premium for being so impulsive" routine.

Ooooop, this thread was about shortening a YZF450. Some people have had success lowering (shortening) the suspension (done by a reputable suspension shop).
 
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#8
If the CRF250 has the same seat as the 450... it sinks a LOT. Too much. First time in my life to get monkey-butt was due to that seat! Way too soft IMHO. Put a SDG tall seat on it, no more monkey-butt. :aj:
 

biglou

#9
Oh, I was going to add, also, that to me, the CRF ergonomics are much tighter than the YZF. Peg to seat distance seems an inch or so shorter. So maybe that helps those shorter than I, providing they can get moving?
 

Treejumper

2 wheeled idiot
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#10
A YZF450 has a seat? ;) I thought i had vinyl stapled to the air box. I'm 5'10 and all leg but have to say that once the suspension warmed up it seemed to squat better when sitting on and didnt feel as tall. I think my 86 YZ250 sits taller than the new 450's.
 
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#11
guess I'll hop on one at the local dealer to see how it is, called them and they said it would be about $500 to professionally lower ouch. And Nikki I'd appreciate the extra effort of measuring the seight. Thanks a load people
 

Jaybird

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#12
You should get a quote from Jeremy Wilkey at MX Tech Suspension.
Dealers are for showrooms and salesmen.
 

nikki

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#13
I had a feeling....

I measured up some seat heights tonight and this is what I found:


04 CRF 250 (stock suspension/sag/clickers/6-8 hours ride time) - 37.3" above pegs

04 CRF 450 (stock suspension/sag/clickers/6-8 hours ride time) - 37.2" above pegs

03 YZ 250F (stock suspension/sag/clickers/50+ hours ride time) - 37.0" above pegs


I find this all very interesting as I generally hear the Hondas sit around 37" and the Yamahas around 39". My guess is they are measuring at different points. Either that or my 250F has lost a little spunk in the seat height department.
 

Jaybird

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#14
I think sag has to be spot-on before a seat height measurment is taken, or it is moot.
 
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#15
all about 37 inches that is interesting, if I get a new bike I wouldnt mind the seight height losing its spunk 37 inches is just fine for me