beeza geeza

Just an update to my wiring question incase anybody need the info in the future "3 wires just going between the electronic ignition to the sidestand relay" My 1982 to 1996 Haynes Manual wiring diagram for the 1991 onwards models is WRONG Real wiring - One of the wires goes to the On/Kill switch, one to Earth and the third does go to the sidestand relay Now seems a lot more logical

Hi again All I think I should share a little more information about the fault/s I am having Original Fault - Bike would start after a lot of effort sounded awful, then usually ran for a while without much power then dies So far found that tappet gaps were non existent, in fact probably pushing valves slightly open, now adjusted Cam chain clattering around, never been adjusted, now adjusted Carb and jets dirty, mixture screw out 5 1/2 turns instead of 1 to 1 1/2, float touching top of chamber, all now cleaned, jets are correct, mixture and float adjusted Leak in air hose from carb to engine due to wrong size hose, now corrected also HT lead, plug and plugcap changed, Petrol tap filter was clean, air filter cleaned, oil changed, brakes done etc etc etc Fault now - Has trouble starting but when it does it sound great, Once started I can turn it off and it will normally start straight away easily without even warming up, but the next day same symptons Some times it will just cut out while ticking over and the refuse to start again (Petrol fine) Spark did look very weak when the bike was not working, other days spark looks fine (rotating 4 new spark plugs) Purchased second hand coil and fitted Still the same problem (I could of course be unlucky and bought a coil with the same fault) New battery fitted today (though I did not think this was the fault) Started after not to much trouble, went out for a ride, sounded lovely up to 50mph with no problems Got home turned corner 1st gear it died and has not started again since!! Spark again does look a little weak Can Electronic ignition affect the spark density? in theory it just shorts the coil to earth at the correct moment and the coil defines the power of the spark. Help Appreciated, Ade (Next step tomorrow is to measure the Pulser and Source coil resistance, I deduce from the last reply the Source Coil is the power for the CDI)

Hi All I am a little confused with the wiring of the electronic ignition on a 1993 SR125 Book shows:- 4 wires going to the pulser coils, 2 to each, (are both pulser coils for timing?) 1 wire going to the Ignition coil, as expected 3 wires just going between the electronic ignition to the sidestand relay The other wire on the sidestand relay going to the sidestand, neutral, and clutch switches Why 3 wires between the two, is this a diagram mistake? and lastly (maybe not) what actually powers the CDI Hope you can help Ade

Hi All, Just joined the owners club but do not have a Yamaha myself Son in Law just got ripped off when buying a 1993 SR125 it lasted 7 miles before stopping I've been working on it for 2 weeks, not much on it that was working properly Advertised as daily commuter bike just taxed and tested.... NO Chance The newest motorcycle that I had worked on was my 1986 Silverwing so 1993 is getting really modern for me. So this seems to be a nice little 125 that is pretty easy to understand List of faults as long as my arm but I'm getting there and actually enjoying working on it All the Best Ade

Many thanks for the info Jimmy The 1984 one listed on ebay does not have the blue and white plugs like mine but does have 4 wires per plug http://www.ebay.co.uk/itm/1984-YAMAHA-SR125-CDI-IGNITOR-/281112091069?pt=UK_Motorcycle_Parts_13&hash=item41739619bd Was there a 3rd type? Cheers Ade

Hi All I am working on my son in laws 1993 SR125, it appears to have an electronic ignition problem Looking to buy a second hand one but there appears to be at least 2 sorts The one on the bike has 2 socket with 4 wires in each I have found one that looks the same but states that it's off a 1984 bike One is listed as being of a 1992 bike has a 6 wire socket and a 2 wires socket so will not fit as standard Does anybody know if the 1984 one will be compatible Thanks in Advance Ade