Difference between revisions of "Yamaha YZ400"

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Yamaha YZ400 (edit)

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{{Motorcycle
|name            = Yamaha YZ400
|photo= 1976-Yamaha-YZ400C-Yellow-514-0.jpg
|aka              =
|manufacturer    = Yamaha
|parent_company  =
|production      = 76-79
|model_year      =
|predecessor      =
|successor        =
|class            =Motorcross
|engine          = 397[[cc]] Air-cooled, 2-stroke, single
|bore_stroke      = 85mm x 70 mm
|compression      = 7.59 : 1
|top_speed        =80 mph
|power            =
|torque          =
|ignition        =
|fuel_system      = Mikuni VM36SC
|spark_plug      = {{sparkplug|NGK B8EV}} '76 , '77-78 , '79
|battery          =
|transmission    =
|final_drive      = {{chain|520x105}} <ref name="1978_owners">{{cite book|title=1978 YZ400E Owners Service Manual|publisher=Yamaha|url=https://www.dropbox.com/s/5loq4u3c41mspzi/1978%20Yamaha%20YZ400%20E%20owners%20service%20manual.pdf?dl=0}}</ref>
|front_sprocket  = 15T
|rear_sprocket    = 50T
|frame            = Tubular steel double cradle
|suspension      =
|brakes          =
|front_tire      = {{tire|3.00-21}} '76 , '77-78 , '79 <ref name="1978_owners"/>
|front_tire_psi  = 13
|rear_tire    = {{tire|4.50-18}} '76-79  <ref name="1978_owners"/>
|rear_tire_psi    = 15
|rake_trail      =
|wheelbase        = 1450 mm<ref name="1978_owners"/>
|length          = 2145 mm<ref name="1978_owners"/>
|width            = 910 mm<ref name="1978_owners"/>
|height          = 1180 mm<ref name="1978_owners"/>
|seat_height      = 910 mm<ref name="1978_owners"/>
|dry_weight      =
|wet_weight      = 103 kg
|fuel_capacity    =
|oil_capacity    = change: 1.1L<br />rebuild: 1.25 L
|recommended_oil  = Yamalube 10W-40
|fuel_consumption =
|turning_radius  =
|values          = $1,000 - $3,000
|related          = [[Yamaha MX400]]<br />[[Yamaha YZ400F]]
|competition      =
|manuals          = [https://www.dropbox.com/s/5loq4u3c41mspzi/1978%20Yamaha%20YZ400%20E%20owners%20service%20manual.pdf?dl=0 1978 YZ400E Service Manual]<br />[https://www.dropbox.com/s/fq9oknr20nwgie1/1979%20Yamaha%20YZ400%20F%20owners%20service%20manual.pdf?dl=0 1979 Yamaha YZ400F Service Manual]
}}
: ''This article is about the scooter, for the 1970s Motorcrosser, see [[Yamaha YZ400F]] for the recent version''
==1976 YZ400C==
==1976 YZ400C==
[[Image:1976-Yamaha-YZ400C-Yellow-514-0.jpg|left|thumb|1976 Yamaha YZ400C in Yellow]][[Image:1976-Yamaha-YZ400C-Yellow-514-1.jpg|left|thumb|1976 Yamaha YZ400C in Yellow]][[Image:1976-Yamaha-YZ400C-Yellow-514-2.jpg|left|thumb|1976 Yamaha YZ400C in Yellow]][[Image:1976-Yamaha-YZ400C-Yellow-514-3.jpg|left|thumb|1976 Yamaha YZ400C in Yellow]][[Image:1976-Yamaha-YZ400C-Yellow-514-4.jpg|left|thumb|1976 Yamaha YZ400C in Yellow]][[Image:1976-Yamaha-YZ400C-Yellow-514-5.jpg|left|thumb|1976 Yamaha YZ400C in Yellow]][[Image:1976-Yamaha-YZ400C-Yellow-514-6.jpg|left|thumb|1976 Yamaha YZ400C in Yellow]][[Image:1976-Yamaha-YZ400C-Yellow-514-7.jpg|left|thumb|1976 Yamaha YZ400C in Yellow]]
Take a 1975 [[Yamaha_MX400| MX400]], paint it Yellow and add the spedo air forks and you end up with the 1976 YZ400C (I only saw 1, I swear it felt like an MX400).
<br style="clear: left"/>
 
{{clear}}
<gallery mode="packed-hover">
File:1976-Yamaha-YZ400C-Yellow-514-0.jpg|left|thumb|1976 Yamaha YZ400C in Yellow
File:1976-Yamaha-YZ400C-Yellow-514-1.jpg|left|thumb|1976 Yamaha YZ400C in Yellow
File:1976-Yamaha-YZ400C-Yellow-514-2.jpg|left|thumb|1976 Yamaha YZ400C in Yellow
File:1976-Yamaha-YZ400C-Yellow-514-3.jpg|left|thumb|1976 Yamaha YZ400C in Yellow
File:1976-Yamaha-YZ400C-Yellow-514-4.jpg|left|thumb|1976 Yamaha YZ400C in Yellow
File:1976-Yamaha-YZ400C-Yellow-514-5.jpg|left|thumb|1976 Yamaha YZ400C in Yellow
File:1976-Yamaha-YZ400C-Yellow-514-6.jpg|left|thumb|1976 Yamaha YZ400C in Yellow
File:1976-Yamaha-YZ400C-Yellow-514-7.jpg|left|thumb|1976 Yamaha YZ400C in Yellow
</gallery>




* SERIAL # 510-100101 - 102838
==1977==
==1977==
[[Image:1977-Yamaha-YZ400-Yellow-692-0.jpg|left|thumb|1977 Yamaha YZ400 in Yellow]][[Image:1977-Yamaha-YZ400-Yellow-692-1.jpg|left|thumb|1977 Yamaha YZ400 in Yellow]][[Image:1977-Yamaha-YZ400-Yellow-692-2.jpg|left|thumb|1977 Yamaha YZ400 in Yellow]][[Image:1977-Yamaha-YZ400-Yellow-692-3.jpg|left|thumb|1977 Yamaha YZ400 in Yellow]][[Image:1977-Yamaha-YZ400-Yellow-692-4.jpg|left|thumb|1977 Yamaha YZ400 in Yellow]]
A great leap forward in frame, engine and suspension design, the 1977 YZ400 was only lacking in it's ability to track corners because of the round tubular swing arm that caused too much flex. The [[monoshock]] was now encased inside the [[Monocoque frame]] that ran under the gas tank.
 
<gallery mode="packed-hover">
File:1977-Yamaha-YZ400-Yellow-692-0.jpg|left|thumb|1977 Yamaha YZ400 in Yellow
File:1977-Yamaha-YZ400-Yellow-692-1.jpg|left|thumb|1977 Yamaha YZ400 in Yellow
File:1977-Yamaha-YZ400-Yellow-692-2.jpg|left|thumb|1977 Yamaha YZ400 in Yellow
File:1977-Yamaha-YZ400-Yellow-692-3.jpg|left|thumb|1977 Yamaha YZ400 in Yellow
File:1977-Yamaha-YZ400-Yellow-692-4.jpg|left|thumb|1977 Yamaha YZ400 in Yellow
File:1977-yz400-0.jpg|1977 YZ400
File:1977-yz400-1.jpg|1977 YZ400
File:1977-yz400-2.jpg|1977 YZ400
File:1977-yz400-3.jpg|1977 YZ400
File:1977-yz400-4.jpg|1977 YZ400
</gallery>
<br style="clear: left"/>
<br style="clear: left"/>
* SERIAL # 1W4-000101 - 006720
==1978==
Expanding on a good thing, the 1978 YZ400 became stable with the box section aluminum swing arm and longer travel (at both ends). The bike was a bit heavy (tipping the scales around 240 lbs.) but long gone was the cracks in the frames, common with the previous (non-Monocoque) designs. The rake was also a bit long which made the 1977-1978 YZ400s better at cross-country than in motocross.


<gallery mode="packed-hover">
File:1978-Yamaha-YZ400E-Yellow-5456-0.jpg|left|thumb|1978 Yamaha YZ400E in Yellow
File:1978-Yamaha-YZ400E-Yellow-5456-1.jpg|left|thumb|1978 Yamaha YZ400E in Yellow
File:1978-Yamaha-YZ400E-Yellow-5456-2.jpg|left|thumb|1978 Yamaha YZ400E in Yellow
File:1978-Yamaha-YZ400E-Yellow-5456-3.jpg|left|thumb|1978 Yamaha YZ400E in Yellow
</gallery>
<br style="clear: left"/>
* SERIAL # 2K8-000101 - 007406
==1979==
All good things must come to an end (which very much describes the 1979 YZ400). The rake was decreased to improve the handling in motocross but the 396cc engine was a step backwards (in this editor's opinion). This engine was only used on this bike and the 1980 [[Yamaha_IT425| IT425]]. Previous engines used the over-square 85x70 (397cc) design (even the [[Yamaha_SC500|SC500]] used the same crank 95x70). This engine was 82x75 and never used again.


* SERIAL # 2X5-000101 - N/A
==See Also==
==See Also==
*[[Yamaha YZ50]]
*[[Yamaha YZ50]]
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*[[Yamaha YZ490]]
*[[Yamaha YZ490]]


==References==
{{reflist}}
{{template:Yamaha YZ}}
{{Yamaha}}


[[Category:Yamaha motorcycles|YZ400, Yamaha]]
[[Category:Yamaha motorcycles|YZ400, Yamaha]]
[[Category:Yamaha YZ series]]
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