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Yamaha YZ400 1979 (complete restoration) - $3700 (Pahrump, NV)

Yamaha YZ400 1979 (complete restoration) - $3700 (Pahrump, NV)

  Yamaha YZ400 1979 complete restoration - $3700 Pahrump, NV

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This is a full restoration of a 1979 YZ400. It is not a museum quality restoration and was never intended to be a show queen. My intentions were to restore the bike to a like nearly new condition to race vintage motocross, and I accomplished that, the bike is really like a new motorcycle. I have since decided to build a different bike for that purpose and will be selling this one. I have over $5600.00 invested in this restoration, this is a quality build, and a bike you can be proud of in your garage or at the track.

Below are the things that have been done to the bike listed by what are brand new parts, and what are used parts purchased off the internet that may be like new or at least in very good to excellent condition and certainly better condition than on this bike when I purchased it.

The bike has not been run very much at all. It has been idled 3 times, once for 30 seconds, once for 2 minutes, and once for 3 minutes. It also was ridden once for a short time, see video here ( for the purpose to ensure it ran properly and give you, the potential buyer, a chance to see and hear the bike run and shift. When it was ridden in the video, throttle was very light and revs kept low as the bike is still in the break-in phase. It will be the new owner's responsibility to break-in the bike when purchased as it will not be ridden again until in possession of the new owner. Currently the pre-mix (Amsoil Interceptor and premium 92 octane gas) in the bike is at a ratio of 16:1, again for break-in. In the video the right side number plate is not on the bike. I removed it to keep from accidently scuffing it while starting the bike.

Below is an article written by Cycle Magazine in the September 1979 issue on this bike. It is informative and entertaining to read. It also gives those of you interested in the bike an idea what it was thought of back in the day. One of the things I like about this bike is you get a long travel suspension (10.6 front and 10.4 rear) with a lower seat height. Being inseam challenged (29.5") modern long travel bikes are a difficult touch the ground on. This bike I can touch the ground on both sides, not flat footed, but rideable.

Shipping for the bike will be the responsibility of the purchaser. If you need me to deliver the bike to the shipper, rather than them picking it up at my house, I will transport it to Las Vegas Nevada (70 miles) free of cost to the doorstep of the shipping company. Other than transport to the shipping company in Las Vegas, I will make myself available to the shipping company for loading if they come to my house. If you want to do local pick-up, I will drive to meet you up to 70 miles from Pahrump NV.

The bike is being sold AS-IS WITH NO WARRANTY IMPLIED. Also, this bike DOES NOT HAVE A TITLE, which is common on bikes this old and that have been restored, but it will come with a bill of sale. You can then apply for a title from your state once you are in possession of the bike if you decide you want the bike titled. In most states you can register for an off-road permit without a title.

ENGINE (New Parts):
Piston (4th oversize)
Rings (4th oversize)
wrist pin
wrist pin bearing
crank bearing
crank pin
thrust washers
main bearings
crank seals
gaskets throughout
(head, base, and all crankcase gaskets)
all seals and o-rings in the motor
kickstarter boss
boysen reed valves
intake manifold
air filter
spark plug
countershaft sprocket
fuel line
overflow lines
shift shaft drive chain protector
expansion chamber mounts

ENGINE (Other work):
Painted all cases
painted cylinder head
cylinder bored to 4th oversize & all ports chamfered
replaced shift drum with used part (original damaged)
checked tolerances on shift forks-all within spec
all gears and shafts in transmission look very good
reed caged replaced with used part
rebuilt carb
replaced air filter box with used part
replaced stator with used part
Crankshaft work to press-in the new lower crank bearing done by a motorcycle speed shop in Las Vegas Nevada

FRAME (New parts):
Swingarm bearings
swingarm seals
chain guide
chain guide rollers (2)
clutch cable
front brake cable
throttle cable
steering head bearings
chain rash protector on swingarm
handlebar grips
numerous nuts bolts and washers
front wheel bearings
rear wheel bearings
front wheel seals
rear wheel seals
rear brake shoes (front are like new)
front tire, front tube
front wheel band
rear tire
rear tube
rear wheel band
rear wheel lock
stainless steel spokes and nipples for rear wheel
rear wheel sprocket
drive chain
seat cover

FRAME (Other work):
replaced entire frame
painted frame
replaced swingarm
painted swingarm
front brake cable guides
painted clutch and front brake handlebar lever mounts
painted triple clamps
painted handle bars
painted front fork lower legs
kickstand parts(not installed)
painted front backing plate
painted rear hub and backing plate

BODY (New Parts):
front fender
rear fender
left side panel
right side panel
tank decals
number plate decals
front gas tank mounts(2)
fuel petcock

BODY (Other work):
Polished fuel tank (removed light scratches still has a couple small imperfections).

EXTRAS (Available if purchaser wants):
New countershaft sprocket 13T (Stock 14T installed)
1 new head gasket
Several new base gaskets

The only real cosmetic issues are the rims, which have scratches on them. They are the original rims, so that is to be expected. The rims have no cracks and are sound.

Rebuild of rear monoshock (the shock has good feel and damping, but it is unknown when it was rebuilt, so having it rebuilt might be a good idea if you plan on racing it. At that time you can get the correct spring for your weight. If you are going to just play ride with it, the monoshock should be fine. A quote for the rebuild was just under 300.00.)
The fork seals are not leaking or shedding so they were not replaced, but the fork oil was changed.
The fuel tank rear rubber band style mount (this part is not available anymore and haven't found a good used one yet). I have lockwired the rear mount to hold the tank down securely at the rear. In time a good replacement part will show up on internet if you keep looking.

BIKE HISTORY SINCE BUILD: The bike has been ran only about 7 minutes total since the build was complete. It was ran for 3 idle sessions of 30 seconds (first start up) 2 minutes, until the cylinder was slightly warm to the touch, 3 minutes again warm to the touch but not hot. Then it was ridden on the pavement very slowly and at light load for less than 2 minutes to make sure the bike ran well as it should and a general test drive. This test drive can be viewed in the video mentioned above. So the bike still needs a break-in. All of the above running was with a premix of fuel and oil (Amsoil Interceptor) at 16:1.

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Last Updated on: February 25, 2018
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