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carl ekblom

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  1. carl ekblom
    A more and more common problem? These people seem stock some https://www.francetrialclassic.com/en/engine-spares/68-bultaco-sherpa-250-350-primary-transmission-chain.html Perhaps Spanish?
  2. carl ekblom
    Unusual dimesion? Found it: https://joresa.com/en-gb/about Pitch should be 9.52 (3/8) Roller dia should be 5.08mm
  3. carl ekblom
    Measurements taken at one original 199B chain Roller dia: 5.0 (4.98mm) Pitch: 9.5 (9.46mm) Inside width: 7.5 (7.52mm) No of rollers: 52 Clutch chainwheel width is 6.95mm
  4. carl ekblom
    Yes, but remember to have the spark plug earthened and away from the spark plug hole. I guess 30-40 quick kicks is needed.
  5. carl ekblom
    If you have the Mikuni carb it may have flood and you ought to clean your crankcase With Mikuni carb: 1 Always close the petrol tap when parked. 2. Never park the bike pointing downhill. 3 Check the float valve and float level l
  6. carl ekblom
    Check that the key is there and the flywheel is correctly seated. The key can fell out during assembly (I know?). Normally you don´t need a capacitor with electronic ignition. The instructions should tell. /Carl
  7. carl ekblom
    I think 199B can be made of different things. My 199B top nuts have allen key at top. Rule of a thumb: Inside female diameter is outside male diameter-pitch. Measured inside the stainchons M30x1,5 should be 30-1.5mm or close to 28.5mm. M31x1.5 should be 31-1.5mm or close to 29.5mm. Those may fit https://www.feked.com/ossa-bultaco-fork-stanchion-top-nuts-with-ball-valves-35mm-betor-forks.html
  8. carl ekblom
    My nut measures 30.8mm so it ought to be M31x1,5. Quite unusual.
  9. carl ekblom
    As far as I can remember ?some oil may drain but nothing more will happen. Do not compress the fork. More oil may drain. You can try 1-2 aluminium sealing washers. They are made of soft aluminium and may seal better. I also think it is good practice to replace the fork oil once a year or so. /Carl
  10. carl ekblom
    At Ebay. Problem can be to find correct dimensions. If your stanchions are as thin as 30mm there will be problem as SKF start at 35mm. Kit 35M (35x47x10) fit many classic bikes. SKF also make for DH-bicycles. Perhaps you can find something there. http://www.jwtimports.com.au/downloads/SKF-Fork-Seal-Measuring-Guide.pdf.
  11. carl ekblom
    To me that sounds pretty normal Normal starting from cold would be on any two stoke trials bike I know Full choke - start engine- after a few seconds - close choke - until engine is warm enough - run carefully Air screw has no function at mid throttle. Use it for idle mixture (throttle closed)
  12. carl ekblom
    I tried those Allballs fork seals and found them to make high striction. I think green SKF seals are among the best. Use fork oil of correct grade. Or hydraulic oil. VG32 often OK. VG15 is thinner and VG46 is thicker However, old forks will always have more striction then modern with teflon bushings and DLS coating As mentioned, make sure there is no tension between fork legs. They must run as parallel as possible. /Carl
  13. carl ekblom
    I would try normal Nitrile O-rings. If problem I would use Viton O-rings. https://www.nes-ips.com/viton-vs-nitrile-o-rings/ Carl
  14. carl ekblom
    Perhaps https://www.electrexworld.co.uk/acatalog/STK-009.html#SID=826 ?
  15. carl ekblom
    2,5 years on ElectrexWorld for Sherpa. No problem at all. Runs well. I think they have something for lighting also.
  16. carl ekblom
    WM3 (2.15) is what moden trials bikes use at the rear. In the 1970s WM2 (1.85) were not uncommon. WM1 (1.6) is for the front.
  17. carl ekblom
    Hi I know you have a lot of area and mountains around Sofia (Vitosha, Old Mountain etc). Hope also some good places for motorbike trials. Happy riding Carl
  18. carl ekblom
    Anyone having alcohol problems can use alkylate petrol. Like Aspen which is a quality product. I use it but mix it with ~1% E85 https://aspenfuel.co.uk/ Several other brands are available.
  19. carl ekblom
    Interesting. Montesa used a petroleum-safe-forever glassfibre..... At least safe for 40 years or so
  20. carl ekblom
    I had to look at a Bing 84 from a Sherpa -Lever down (axle up)- Choke on -Lever up (axle down)- Choke off
  21. carl ekblom
    OK at 199A. Should be OK also at 199B. My filters are later production from Inmotiontrials. Little bending is required to make them fit inside airbox. As you say, a good narrow clamp is needed at the carb intake, I remember that a wide clap caused some problem https://www.inmotiontrials.com/product/bultaco-sherpa-199b-air-filter-on-hose/
  22. carl ekblom
    You need the Correct intake rubber Carb, Throttle cable Mikuni/Amal to Domino (assuming you have the Domino throttle) Air filter for 199B. Also good for 199A. Others I don´t know Inmotiontrials should be able to supply the parts needed
  23. carl ekblom
    As a former owner of a 4Rt 2005 I remember that idle must be set fairly high (uncomfortable?) otherwise engine will be very difficult to start. I think it was 1800 rpm. Also think idle adjustment screw should be turned anticlockwise to increase the idle speed. A long slow kick was needed with no throttle?. I would first try to increase idle speed and get a good starting technique. When engine is hot 3-4 kicks sometimes is needed.
  24. carl ekblom
    I had to look at a new pair i have. Yes correct. I had forgotten. Only the the brake levers are driiled from the factory. I had to do the drilling and tapping myself at the clutch lever.
  25. carl ekblom
 
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