Worn or faulty advance mechanisms will cause the timing to bounce around.įinally, the factory marks are the best compromise and normally work well but some folk recommend retarding the timing slightly to stop pinking on older bikes with our modern petrol mixes. Engine speed up to 9000 RPM is displayed on the screen, and the ignition spark advance measures from 0 90 degrees.
XS650s have a tendency to wear out the springs in the advance mechanism and this is a good check to make sure all is working properly. The W80587 Digital Advance Timing Light features a super bright xenon flash, high visibility LED display designed for precision tuning in addition to diagnostic work. This is mainly for four-strokes as older two-strokes tend to have fixed timing. Once you have the timing checked, blip the throttle and make sure the advance works. Yamaha XS650 automatic ignition advance mechanism So a job best done in the middle of the day not early in the morning or really late at night and definitely not a job to be done indoors as you will choke do death on the fumes, you have been warned! Now my advice would be to take your time and get it right but be aware the bike will not enjoy ticking over for too long and your neighbours might not be overjoyed listening to the mechanical mechophony*. Note the grub screw (mentioned in the previous story) now locked in place with a blob of white sealant. The ignition is triggered by a beam of light being interrupted by a tab on a rotating disc. Karl's XS650 is fitted with a Newtronic aftermarket electronic ignition system. I do this with the engine off as with all the moving bits whirring around it would be easy to jab a screwdriver somewhere unexpected and expensive. On the XS650 you undo the two screws and move the timing back plate.
#MOTORCYCLE TIMING LIGHT MANUAL#
Have a look in the manual as there are a myriad ways of doing this. If they don't then you will have to move the timing.
Pointing this at the bike timing marks, and not the neighbour's dog, you will see the marks on the rotating bit line up with the marks on the static bit. Be careful not to drape the strobe wires near the exhaust pipes, yes, they will melt!įiring up the bike the strobe will emit a bright light each time the cylinder fires. The strobe clips around the first cylinder plug lead. Strobes come in all shapes and sizes and it's best to buy the best you can afford. I find it easier to use a separate battery though you can use the 12 volt one on your bike if fitted. The strobe I use needs a 12volt supply hence the battery. In the picture you can see the manual, tools, strobe, battery and something to kneel on. Make sure you follow the manual as sometimes there are marks for timing and others for checking valve clearances. On the XS650 the timing marks are on the alternator side. Of course it takes a bit of working out with a degree disc or dial indicator first but I always thought it was worth the initial effort in the time saved later on. I often did this with my older two strokes, like my old D14 Bantam, as it was a lot quicker and easier to whip the strobe out than set up the dial indicator or degree disc. Fear not, as with a bit of paint you can make your own timing marks. These are often provided by the manufacturers but on older models they are not. The first on a moving bit, like the alternator rotor, and another on a static bit like the crankcase. To carry out dynamic timing with a strobe you will need timing marks. This latter method is normally the one you use with electronic ignition setups and later points systems and is the one I will attempt to describe here. Static timing, where you work out where the points open in relation to the crank position, or dynamic timing which you check with a strobe against marked timing points with the engine running. There are two main ways to check the timing on your bike. OK.probably a dumb-ass question but I was trying to time my bike with an induction strobe light and cannot get it to flash. = 0) $("#trkFooterDiv").Karl Bentley investigates a misfire on his Yamaha XS650, and discovers that it's all in the timing.Ĭoming back from a wonderful ride ( you can read about it here), the ignition timing on my XS650 slipped due to a loose timing disc.
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