20 Most Recent 1975 Yamaha XS 650 B Questions & Answers

check the clutch adjustment

Charge the battery and check the connections first, and maybe there's a starter fuse. Sometimes the brushes on the starter get dirty form sitting. Push the starter button and gently tap on the starter at the same time and see if it turns over.

Yes this is common. If u don't want that to happen as often and assuming Battery can hold charge while not connected to anything, then make yourself a switch that interrupts ground from battery when circuit is opened.

The needle and seats are not doing their job. Start by checking the float adjustment is correct, if it is, then replace the needle and seat, this should rectify your problem.

If you want to see what the service manual says about it
You can download a free one at
http://www.yamaha-motor-europe.com/community/service/manuals.jsp
Good luck!

Try and switch the coils and plug wires to rule those out. Can be a clogged up muffler, it is easy to pull the baffle. Should be held in with a small rivet or screw. Remove the rivet or screw, get a pair of clamping pliers and clamp them to the end of the baffle and smack that with a hammer to pull it out. Next would be check your valve settings and adjust as needed.

Most are spray mate, but I have used chainsaw oil in the past, its very good, easy to clean off if it flings and I just used to put it on the chain with an old paint brush.

you're in for a fun night. You need to start pumping new fluid in. Fill up the reservoir then pump the lever a couple of times to get fluid to start to flow into there. Then... you'll have to bleed them. Pump pump pump, squeeze, open nipple, close nipple, release, pump pump pump, squeeze, open nipple, close nipple, release. Do not let the reservoir empty out. Keep doing this until you get clean brake fluid through the lines and no bubbles. It's going to take a lot of worth though.

Ok try this way
you have two screws one is loaded with spring other is little inside
follow the steps
start the bike now screw in the spring loaded screw now the idling will be more dont worry about that now tight the air screw now slowly unscrew the air screw now you can find idling difference in one stage the idling will rise ( max) at that point stop unscrewing the air screw now reduce the idling as your wish now take a test ride.

.015 is the standard setting.

Take out all fluids, take out all the filters, take out the sparkplugs, take out the clutch and inspect it carefully(replace all parts that appear aged. Fill the cylinders with a fine oil, take out the valve covers and spray everything in oil, wait one hour then manually rotate the engine - do that at least 4 times. Fill the gearbox with oil, put it in gear (all of them) and rotate the back wheel by hand do that for a whole hour. Use this as an occasion to oil the chain. Refill and pump the brakes several time and look for leaks.
Put new filters and sparkplugs and start the engine; let it heat up then rev it gently for an hour. Now pour cleaning solution in the oil , run it again then replace the oil and the filter. If the engine is water cooled do the same for the coolant.
Run the bike for 500 miles and replace all the fluids (including gearbox and brakes) again.

You have corrosion in your carburetor. Moisture by the fuel needle/teeter-totter set up cause white corrosion to form sticking the needle and stopping the fuel flow. Lay towel around the carburetor to catch small parts , take off the cover , carefully clean and reassemble the carburetor.
The only other thing I have seen that caused a similar shut down problem was water in the water tight electronics box. If condensation has caused a tablespoon or so of water to collect in the electronics box . after a short bouncy drive the components ground and the boat shuts down. This fix is simple , you open the box over night and let it dry out. Then when it is dry just reseal it and the watercraft should run properly again.

If you suspect a malfunctioning ignition coil, check the resistance of primary and secondary windings. Do this when the coil is hot, and again when it is cold. Also measure from the case to each connector. The primary windings should have a very low resistance, typically from a few tenths of an ohm to a few ohms. The secondary windings have a higher resistance, typically in the 10,000 to 13,000 ohm range. To get the actual figures for a specific coil, check the manufacturer's specs. But as a rule of thumb, primary windings range from a few tenths of an ohm to a few ohms, and secondary winding may be 10 ohms or more.

hi, you might be interested with this link, hope this helps http://images.google.com.ph/imgres?imgurl=http://images.cmsnl.com/img/partslists/yamaha-xs650-b-1974-1976-steering-handle-cable-xs650c_thumbyau0774h-10_43b2.jpg&imgrefurl=http://www.cmsnl.com/yamaha-xs650-b-1974-1976_model8524/partslist/&usg=__Dr5k4BQHLstjwgX9GZ76TIdSv1Q=&h=75&w=100&sz=4&hl=tl&start=9&um=1&itbs=1&tbnid=ro91KlFp2QBSzM:&tbnh=61&tbnw=82&prev=/images%3Fq%3DYamaha%2BXS%2B650%2Btach%2Bcable%2Bdiagram%26hl%3Dtl%26rlz%3D1R2ADBF_en%26sa%3DN%26um%3D1

You can go to bikebandit.com and they have a lot of diagrams. I didn't know the year of your bike so I couldn't check in advance. Hope this helps.

JP

well what you need to do is take volt meter and start the bike see if you are getting 13,5 volts at battery or more if not hold throttle at 1500 rpm and see what you have if you do not have this volts coming to battery it could voltage regulator or stator is bad but check all grounds to bike and wiring hope this helps

This is a highly ill - eagle act to do. In the old days we would put an electric drill on the drive cable, but now they make them tamper proof so they only go one way. The bezels are crimped on so you can't get inside them. I expect modern one may be electronic. How will your insurance company know what mileage you have done? I have never known an insurance cancel or fine due to mileage. You should have just disconnected it when you got close to the limit. Buy a used one and use them for 6 months in turns. There are two or three here 23K and one with 36k https://www.google.com/search?q=2002+yamaha+sr125+speedometer ..