bambam_n_chunx Posted June 26, 2008 Report Share Posted June 26, 2008 I had a problem getting my ossa to start a while ago then someone on here gave me the right plug type for the bike.I fitted a new plug and it started first kick. However I dragged it out to try and free the clutch for the nostalgia trial,rode it for a little and now I cant get the bloody thing started again. I have a feeling its the plug again as the spark is now white instead of blue. Any body know what could be causing this. Cheers Andy Quote Link to comment Share on other sites More sharing options...
steveshaw Posted June 26, 2008 Report Share Posted June 26, 2008 Had the same problem with an MAR 1 when I was a lad in 1972, a new plug was required to get the bikegoing every time,eventually changed the ignition unit, bike then went 1st kick everytime, never bought another plug! Quote Link to comment Share on other sites More sharing options...
bambam_n_chunx Posted June 26, 2008 Author Report Share Posted June 26, 2008 Thanks,I forgot to mention this is a tr77 with points and stator. Quote Link to comment Share on other sites More sharing options...
woody Posted June 26, 2008 Report Share Posted June 26, 2008 Realistically, it should start ok (but not keep running) whatever plug is in it (within reason obviously) as long as the plug is functioning correctly. It's more likely one of the components in the ignition is failing that is causing the problem - HT coil, points, condensor or source coil. Replace the easy parts first, points and condensor and see if that improves things. If not then try the HT coil and finally the source coil. I normally use a BP7ES in the Ossa. There is, hopefully, going to be a new electronic ignition available for Ossas in the near future. It will be a complete system, new stator plate/source coil, new HT coil, new CDI unit and a new flywheel rotor. It will have a built in advance. The existing Ossa flywheel can't be used as there are 3 types for the Ossa - early motoplat electronic with the timing pin hole at 9 o'clock, later motoplat electronic with timing pin at 4 o'clock and the points type. To develop 3 ignitions to go with each flywheel would have been cost prohibitive so the solution was to develop one ignition with a new flywheel that will fit any electronic or points model, MAR or Gripper. I'm waiting to get one to try and will be very interested to see how it perfoms. The manufacturer already does a replacement HT coil and CDI unit to replace the motoplat HT coil and that performs very well, really letting the bike rev. No specific date yet as to when they will become available, price should be around Quote Link to comment Share on other sites More sharing options...
bambam_n_chunx Posted June 27, 2008 Author Report Share Posted June 27, 2008 Thanks woody for the information. After finishing work early today I managed to have a proper look at the bike and it appears to be badly flooded. Somehow dirt has got into the carb float bowl and I think its maybe kept the float needle from sealing anyway hopefully once the engine dries out it should be ok. Just one more thing has anybody tried changing their bing carb with any success as I dont seem to be having much luck with mine. Andy Quote Link to comment Share on other sites More sharing options...
woody Posted June 28, 2008 Report Share Posted June 28, 2008 Glad you got it sorted, never mentioned checking carb as thought you'd narrowed it down to electrical. As you've mentioned the Nostalgia trial, any idea if the regs are out yet and where? Not done it before and really keen to have a go this year but seen nothing about it yet. Mikuni is a good a replacement as anything but unless you can get one ready jetted you're going to have to play around with jetting as there is no base setting for any other carb than the Bing, as it was the only one fitted to the later 350s. There are 26/28mm Mikunis on ebay for Quote Link to comment Share on other sites More sharing options...
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