Yamaha 650 Buyer's Manual
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YAMAHA 650 BUYER'S GUIDE
This guide is intended to aid the purchaser or seller of a Yamaha 650 twin in evaluating the bike
and determining the ballpark costs associated with any problems found. This information is only a
guideline and cannot protect the buyer from all possible problems. Each buying decision is unique
and the buyer must use judgment and consider that the final decision is theirs alone. Prices
estimates are given for most items. These estimates will vary widely depending upon factory or
after market prices and between geographic areas. These estimates are in US dollars for parts
only, and labor will be additional.
When looking at a bike for potential purchase, it is a good idea to be well prepared. After deciding
how much you are willing to pay for your purchase and have read this guide, it is suggested that
the following items be taken along when examining a bike.
APPEARANCE
CHROME - A bike that has been left to the elements quickly deteriorates, and the first to go is
usually the chrome. A bike that has chrome in good to excellent shape a valuable find. When
chrome starts to break down, small surface imperfections will develop which eventually turn into
full blown rust spots. If you find small spots on the chrome that are sometimes surrounded by a
small "halo" of rust colored stain, these can usually be removed with a chrome cleaner. If the pit
has started to erupt and the chrome is lifted from the surface (a spot has formed that you can
catch with your fingernail) this can be improved but is usually always visible, even after cleaning.
If the bike is clean, it's easy to just look the chrome over closely and make sure it is in good
shape. If the bike is dirty, use a rag to wipe down the top of a fender or any other area that looks
suspicious to see how it cleans up. A few small imperfections are not a big deal if the surface in
generally in good shape. A good coat of wax will stop the problem from proceeding. Problem
spots to look at are:
Top of the rear fender under the seat.
License plate bracket, under the license.
Bottom side of the handlebars between the two mounting clamps on the triple tree.
Inside the headlight rim.
Inside lower surface of headlight shell.
Underside of exhaust pipes and mufflers.
Value should be deducted for chrome that is pitted beyond salvage. How much is dependent
upon your personal "look pretty" preference.
PAINT - Sun fading is a common problem in early years. Later years didn't suffer as much, but
the '70 through '75 models would tend to fade fairly quickly when left exposed to lots of sun. It
may be very obvious if quite bad, or subtle if just beginning. To determine how bad the color has
faded, remove a side cover and look at the bottom side and compare it to the top of the tank.
Another spot to look is on the left bottom side of the tank. This is as close to the original color as
you can get. If not obvious, it's not a big issue. If the paint is badly faded, the bike can be
Flashlight
Rag
Friend
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Summary of Contents for Yamaha 650

  • Page 1 YAMAHA 650 BUYER'S GUIDE This guide is intended to aid the purchaser or seller of a Yamaha 650 twin in evaluating the bike and determining the ballpark costs associated with any problems found. This information is only a guideline and cannot protect the buyer from all possible problems. Each buying decision is unique and the buyer must use judgment and consider that the final decision is theirs alone.
  • Page 2: Functional Parts

    Replacement covers are also available from aftermarket suppliers for under $100. If looking at a ‘70 through ‘73 model, examine the bottom of the seat pan. Early years of the 650 have a nasty habit of rusting out the seat pan from the inside, and good replacement pans are almost impossible to find.
  • Page 3 BATTERY - I don't think I have ever bought a 650 with a good battery. If you find one with a new battery, great! However, the battery deserves some attention. If the bike has a battery installed, remove the cover and cables and lift it out of the battery compartment.
  • Page 4 The seals will run about $30, not including labor.. ACCESSORIES - In its day there were quite a few aftermarket and Yamaha factory items available for the 650. Nothing like today, but still, listed below is a list of common items: Highway bars.
  • Page 5: Wear Items

    Be sure to pop the cap and shine a flashlight inside the tank. Some mottled looking rust areas are normal for the 650. However, it should appear to be surface rust only, with no visible flaking. If you see continuous areas of rust that appear to be three dimensional, this is the stuff that will flake and clog up carburetors and fuel taps.
  • Page 6 Now that you have made the decision, exchanged the agreed upon $$ and gotten your new toy home - the fun begins! Don't forget to join the Yamaha 650 Society. We will help you keep enjoying your purchase. Sorry for the plug but I couldn't resist.
  • Page 7: Fuse Holders

    FUSE HOLDERS Later years of the 650 twin used a fuse holder that sits on top of the battery. Over time the fuse holder fingers weaken and eventually just break off. This problem can be difficult to diagnose because the symptom can be either a total failure of power to a circuit or intermittent lack of power to various circuits.
  • Page 8: Change Engine Oil

    I use full synthetic automotive. If you plan on keeping your 650, use a good quality 20W40 or 20W50 that is suitable for motorcycle engines. Either petroleum based or synthetic is debatable, so you just have to take...
  • Page 9 you choice. My personal preference is for mineral based oil is Castrol 20W50 while the synthetic I use is Mobil 1 15W50. Lube EVERYTHING that moves. WD-40 is a good rust preventative and water repellent, but it is not a good lubricant. Use a product that is truly a lubricant.

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