20 Most Recent 1977 Yamaha XS 650 D Questions & Answers

Probably the vacumn slides are hanging up, Not because they are stuck, But because the idle screw is set too high to get to idle. The idle will usually hang up at 3,000 rpms. Set the idle mixtures at 1 1/4 turns out & make sure the throttle cable has play. Now back the carb idle down till it just idles about 1,100 rpms. with choke off. If the carb sync is way off, I will hang up on 1 carb when hot. You need a vacumn guage set to make sure they are balanced. To check the spark advance (which I doubt), Put a timing light on the LH plug wire & shine it at the timing marks behaind the LH cover on motor at botton covering the generator. It should be on the F marks at idle & at the unmarked line aprox 1 " over which is full advanced when reved up to 1/2 throttle. But yes a air leak at the intake manifold could cause it to rev, But will be a very erratic idle at 1,100 rpms. If the idle circuits are working correctly, You should be able to kill each cylinder with turning in the mixture screws one at a time. That checks the idle jet circuits.

electrical problems can be a bear and fustrating,one way that I have found an electrical problem is have a few extra fuses on hand and disconnect all wire connections,put new fuse in and start to reconnect each one,until you blow fuse,that way you have isolated the problem,good luck,if you get fustrated you may have to walk away from it for a while to calm down,and regroup been there done that.

engine number should be located on top of the gearbox, stamped, either left or right side.
Frame number is located on the steering stem of the frame.

Assuming you have spark and know you're getting proper fuel, next we have to suspect compression. Assuming you don't have a compression gauge at this point, check your valve clearances. You may end up finding some out of spec, but you are specifically looking for valves that have no lash at all. If you find any like this, you will have likely found your problem. Adjust those valves and check it out. If it works, keep a check on that valve. If it keeps tightening up, you may need a new valve.

Next, again assuming you don't have a compression gauge, remove both plugs. Hold your thumb over the hole on the side that does hit and crank the engine over. Notice how hard it blows your thumb off. Now the other side. Does it feel as strong? This will only get you ball park, but usually when a cylinder is completely dead due to lack of compression, you can pretty easily tell a difference. If there is a difference, it's time to rebuild the top end.

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chec connections in harness and inspec and test fuses--wiring gets old so become a detective-thanx olsculer

NGK BP8ES GAP 0.6-0.7mm

buddy what part are we talking about here the h.d. cable or coils ???

hello
sounds like two problems. one a possible charging system failure and a carb issue. the carb issue you are haveing is what is a result of a float valve sticking. they can stick or hang open for a couple reasons, either dirt getting into the fuel line, or buildup causeing the vavle to become sticky and not function as well, or a worn float valves wont seal as well. when the float valves dont function and regulate the fuel, the excess goes out the overflow. to correct this the carbs need removed and the float valves inspected for which fault you are encountering.
the headlight drain is most likely caused from a no charge condition. with the bike running above idle. you should be able to get a 13-15volt chargeing voltage while testing at the battery terminals. 90% of the time this is caused from a faulty rectifier/regulator.

there is no way for fuel to get passed the rings right? So if you filled the head with fuel, it would just work its way down the exhaust pipe and out the back, just like its doing. The only way of getting fuel into the sump is; if you have seriously bad rings (it would be burning oil) OR if its getting through the breather system. I don't even think if the injectors were on full-time, it still wouldn't get into the sump... very strange. Are you sure its not coolant? A serious coolant leak can be completely unnoticeable from the outside, but catastrophic to the inside. __________________

If your brake fluid is in need of changing, do so before long-term storage. Similarly, hydraulic clutch fluid should be changed before you store your bike; both systems may suffer failure if moisture gets in. Also make sure your coolant is fresh, as deposits can form from old fluid. For service intervals, consult your owner's manual.

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 ..

Not mentioned in the Service manual http://www.badrad600.com/Yamaha_Radian_Factory_Service_Manual_OCR.pdf https://www.google.com/search?q=1986+Yamaha+YX600+Radian+remove+USA+speed+restriction Something like this?

Removing 95bhp restriction ' Yamaha Star Cycle V-Max ...

vmaxforum.net https://www.vmaxforum.net > threads > removing-95bh... Jan 14, 2013 - Air jets could easily become blocked. Step 3: Removing the speed restriction. On the back of the speedo-needle a disc with two different . ..

Check the diagrams here https://www.google.com/search?q=yamaha+sega+81+firing+order ..

Question edited for a lot more clarity, add maker. Question moved to Yamaha Motorcycle. Unlikely to be a carburetor problem as this appears to be fuel injected! https://www.google.com/search?q=Yamaha+Mio+125+MX+no+start ..

Make sure the fuel is getting to the valve and passing through it. Possible blockage in fuel line or in the tank.

It isn't called a Magneto, that was for really old bikes. It is a 'stator'. Service manual https://drive.google.com/drive/folders/1OFbBW2YhLpL1-Xbsw9vexi84Y7aXGTdG Parts List https://www.cmsnl.com/yamaha-rt100-1990-l-usa_model9624/partslist/ https://www.google.com/search?q=1990+yamaha+rt100+wiring+diagram ..

First make sure that the new battery has been fully charged and is not defective. Next make sure that the proper voltage is reaching the started. You may have a bad post connection or loose connection at the starter. Try jumping you battery with another known good battery.

Above the master cylinder on each brake.

Your Service Manual is here

service-manual-yzf-r15.pdf

Ridertua https://ridertua.files.wordpress.com > 2011/04 > se... To help identify parts and clarify procedure steps, there are exploded diagrams "3" at the start of each removal and disassembly section. • Numbers "4" are ... 338 pages ..