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carl ekblom

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About carl ekblom

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    Advanced Member

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  • Bike
    RoyalE-65 Bult199A

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  1. 2T Petroil mix

    v1nn1e: Your calculation is correct 1.5% is what I use for trials two strokes or 75ml/5 litre Or Aspen 2-stroke petrol which is 2%. /Carl
  2. Sherpa 198 Amal mk 2 carb settings

    I don´t know about Bultaco Amal settings but a slide with no 1 opening.......That sounds incredibly rich. I think something between 2,5-3,5 would be normal. Throttle opening comes into effect just above idle and flattens out at approx 1/4 of opening where needle and needle jet is more important. I see Inmotion list thottle valves with 2,5 to 4 openings.
  3. Spark Plug Gap with Electrex

    I use Electrex Bultaco ignition and Champion N11YC at 0.6mm. No problem att all so far Carl
  4. TY175 Progressive Clutch?

    I don´t know anything about Yamaha clutches but generally speaking: Clutch centre and clutch basket must not be notched and clutch plates must be in good condition. I think thin oil is better than thick oil. I use engine oil 0W-20 to get a drag free clutch Carl
  5. Crusader / Bullet - forks advice please

    But... ..would not an Indian Bullet engine be considered as pre-65? I think they should. And to gain ground clearence you should cut the oil filter away.
  6. Crusader / Bullet - forks advice please

    Bullet forks are pre-65. I am not shure about the MZ forks? For modern steering you need 20-22 degree headstock angle and a front wheel spindle that sits 60-65mm in front of headstock centerline. This will give you a proper rake with a 21" trials front wheel You can use parallel yokes with (1)all offset in the yokes. (2) Yokes with part of the offest in the yokes and the rest in the lower fork legs (like modern bikes) or (3)nonparallel yokes. Bultaco Sherpa use a combination of (2) and (3). I use a modified (replica) Crusader frame (20 degree angle), Ceriani forks (1961 type) and my own nonparallel yokes for a front wheel spindle offset of 65mm and I think it steers well. Carl
  7. Ulf Karlsson

    I heard he was very sick. It seems that the cancer won.
  8. Bing Carb specs for Model 183 Sherpa T.

    Hello This is what I found in my Bing carb for my 199B Idle 45 Needle jet 2,73 Main 123 Markings on throttle valve and needle are difficult to understand but needle was in 2nd position from top.
  9. Rubbish front brake

    Gold Fren was no success for me. Brake disc must be very clean. I use aceton to degrease and Red Galfer brake pads as I think they are the best /Carl
  10. Alpina 212 - Turn it into a trials bike?

    Yokes for Sherpa have approx 1.5 degree rake moving front wheel something like 20mm forward
  11. Overheating problem?

    This is what I use mikuni vm26: Needle 5C23, throttle 2, main jet 140, idle jet 30, needle jet O3, needle first groove from top (French Trial Classics jetting). Air screw is 1 turn out
  12. Overheating problem?

    It might be as simple as closing air screw and make adjustments to needle position. Basic setting for air screw would be 0.5-2 turns out.
  13. 2017 4T miss fire on high RPM

    It´s easy to hit the electronic rev limiter. Even I do it sometimes. The very high steps you manage to master need speed. Perhaps you should change the gearing (larger front sprocket or smaller rear sprocket). Main jet 125-130 would be fine.
  14. IRC tyres

    "These tyres are the brand new 2017 model with the re-designed bead to fit modern rims better. "
  15. IRC tyres

    Inmotiontrials now stock something they call "The New IRC Tubeless Tyre". https://www.inmotiontrials.com/new-irc-tubeless-tyre-now-stock/. Design changed?