Difference between revisions of "Yamaha YZ400"

From CycleChaos
Jump to navigation Jump to search
m (Wikipedia python library)
(template fixes)
 
(17 intermediate revisions by 5 users not shown)
Line 1: Line 1:
{{Infobox Motorcycle
{{Motorcycle
|name            = Yamaha YZ400
|name            = Yamaha YZ400
|image            =  
|photo= 1976-Yamaha-YZ400C-Yellow-514-0.jpg
|aka              =  
|aka              =  
|manufacturer    = [[Yamaha]]
|manufacturer    = Yamaha
|parent_company  =  
|parent_company  =  
|production      = 76-79
|production      = 76-79
Line 9: Line 9:
|predecessor      =  
|predecessor      =  
|successor        =  
|successor        =  
|class            =  
|class            =Motorcross
|engine          = 400
|engine          = 397[[cc]] Air-cooled, 2-stroke, single
|bore_stroke      =  
|bore_stroke      = 85mm x 70 mm
|compression      =  
|compression      = 7.59 : 1
|top_speed        =  
|top_speed        =80 mph
|power            =  
|power            =  
|torque          =  
|torque          =  
|ignition        =  
|ignition        =  
|spark_plug      = {{sparkplug|B8EV}} '76 , '77-78 , '79
|fuel_system      = Mikuni VM36SC
|spark_plug      = {{sparkplug|NGK B8EV}} '76 , '77-78 , '79
|battery          =  
|battery          =  
|transmission    =  
|transmission    =  
|frame            =  
|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      =  
|suspension      =  
|brakes          =  
|brakes          =  
|front_tire      = {{tire|3.00-21}} '76 , '77-78 , '79
|front_tire      = {{tire|3.00-21}} '76 , '77-78 , '79 <ref name="1978_owners"/>
|rear_tire    = {{tire|6705}} '79<br />{{tire|4.50-18}} '76 , '77-78
|front_tire_psi  = 13
|rear_tire    = {{tire|4.50-18}} '76-79  <ref name="1978_owners"/>
|rear_tire_psi    = 15
|rake_trail      =  
|rake_trail      =  
|wheelbase        =  
|wheelbase        = 1450 mm<ref name="1978_owners"/>
|length          =  
|length          = 2145 mm<ref name="1978_owners"/>
|width            =  
|width            = 910 mm<ref name="1978_owners"/>
|height          =  
|height          = 1180 mm<ref name="1978_owners"/>
|seat_height      =  
|seat_height      = 910 mm<ref name="1978_owners"/>
|dry_weight      =  
|dry_weight      =  
|wet_weight      =  
|wet_weight      = 103 kg
|fuel_capacity    =  
|fuel_capacity    =  
|oil_capacity    =  
|oil_capacity    = change: 1.1L<br />rebuild: 1.25 L
|recommended_oil  = Yamalube 10W-40
|fuel_consumption =  
|fuel_consumption =  
|turning_radius  =  
|turning_radius  =  
|related          =  
|values          = $1,000 - $3,000
|related          = [[Yamaha MX400]]<br />[[Yamaha YZ400F]]
|competition      =  
|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==
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).
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).


[[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]]
{{clear}}
<br style="clear: left"/>
<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
* SERIAL # 510-100101 - 102838
==1977==
==1977==
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.
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.


[[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]]
<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
* SERIAL # 1W4-000101 - 006720
==1978==
==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.
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.


[[Image:1978-Yamaha-YZ400E-Yellow-5456-0.jpg|left|thumb|1978 Yamaha YZ400E in Yellow]][[Image:1978-Yamaha-YZ400E-Yellow-5456-1.jpg|left|thumb|1978 Yamaha YZ400E in Yellow]][[Image:1978-Yamaha-YZ400E-Yellow-5456-2.jpg|left|thumb|1978 Yamaha YZ400E in Yellow]][[Image:1978-Yamaha-YZ400E-Yellow-5456-3.jpg|left|thumb|1978 Yamaha YZ400E in Yellow]]
<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"/>
<br style="clear: left"/>
* SERIAL # 2K8-000101 - 007406
* SERIAL # 2K8-000101 - 007406
Line 71: Line 107:
*[[Yamaha YZ250]]
*[[Yamaha YZ250]]
*[[Yamaha YZ490]]
*[[Yamaha YZ490]]
==References==
{{reflist}}
{{template:Yamaha YZ}}
{{template:Yamaha YZ}}
{{Yamaha}}
{{Yamaha}}

Latest revision as of 20:07, 23 November 2019

1976-Yamaha-YZ400C-Yellow-514-0.jpg
Yamaha YZ400
Manufacturer
Production 76-79
Class Motorcross
Engine
397cc Air-cooled, 2-stroke, single
Bore / Stroke 85mm x 70 mm
Compression ratio 7.59 : 1
Top Speed 80 mph
Fuel System Mikuni VM36SC
Spark Plug NGK B8EV '76 , '77-78 , '79
Final Drive Chain: 520x105 [1]
Front Sprocket 15T
Rear Sprocket 50T
Frame Tubular steel double cradle
Front Tire 3.00-21 '76 , '77-78 , '79 [1]
Rear Tire 4.50-18 '76-79 [1]
Recommended Tire Pressure Front: 13 psi
Rear: 15 psi
Wheelbase 1450 mm[1]
Length 2145 mm[1]
Width 910 mm[1]
Height 1180 mm[1]
Seat Height 910 mm[1]
Weight 103 kg (wet)
Oil Capacity change: 1.1L
rebuild: 1.25 L
Recommended Oil Yamalube 10W-40
Related Yamaha MX400
Yamaha YZ400F
Manuals 1978 YZ400E Service Manual
1979 Yamaha YZ400F Service Manual
More Manuals

Reviews ·

This article is about the scooter, for the 1970s Motorcrosser, see Yamaha YZ400F for the recent version

1976 YZ400C[edit | edit source]

Take a 1975 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).


  • SERIAL # 510-100101 - 102838

1977[edit | edit source]

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.


  • SERIAL # 1W4-000101 - 006720

1978[edit | edit source]

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.


  • SERIAL # 2K8-000101 - 007406

1979[edit | edit source]

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 IT425. Previous engines used the over-square 85x70 (397cc) design (even the SC500 used the same crank 95x70). This engine was 82x75 and never used again.

  • SERIAL # 2X5-000101 - N/A

See Also[edit | edit source]


References[edit | edit source]