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  1. Jester1971

    39 tooth rear sprocket- unreasonable?

    Never measured times, I think 0-60 will not be any different, it might actually be smoother as you will or have to frantically go through the gears as fast. what I can say is I used to overtake cars in between corners with a quick twist and I would not even have to think about it but on the...
  2. Jester1971

    39 tooth rear sprocket- unreasonable?

    Yes of course you are right. Sorry my own explorations in gearing fried my brain. You guys in America seem to be able to get 16t fronts very easy compared with here in UK.
  3. Jester1971

    39 tooth rear sprocket- unreasonable?

    I have gone down to 42 on the rear with a standard 15 on the front. This calms the acceleration down quite a bit and makes the bike more civilised and manageable, well for a little 400. On the standard 15/45 gearing with a few gentle (air box, fuel X, and End can) mods my smart was a bit mad...
  4. Jester1971

    My Vit Journey

    I put S22 on my Svart 401 in late October just before taking her off the road for winter. I managed around 80 miles on 15 degree dry roads and got them scrubbed in. They do not warm up as fast as the Pirelli Rally STR’ do but they do not have the block movement of the Pirelli’s to help get some...
  5. Jester1971

    How KTM problems affect Husqvarna?

    Do not get me wrong I love my Husky but I am now regretting not buying another Honda.
  6. Jester1971

    Svartpilen 401 with 390 Suspension and 19" Front Wheel

    What has raising the front 2.5 inches done to the handling? I would imagine it has slowed the steering down a lot? Also you have a hard rear end and a super squishy fork, how does this feel on the road?
  7. Jester1971

    Svartpilen 401 2024 mirrors

    I have a 2023 Svart, I tried everything to remove the threaded inserts from my bar ends to no avail. I used the original bolt from the bar end weights to hold on my bar end mirrors. The bolt was smaller than the one from the new mirror so I used some alloy tube to reduce the hole. I could not...
  8. Jester1971

    How KTM problems affect Husqvarna?

    As per the title really, with KTM announcing self administration, how does this affect us Husqvarna owners. I mean regarding parts, warranty and services. I can find no info anywhere just people talking about KTM…!
  9. Jester1971

    track bike build log - Vitpilen 401, 2017-2023 R1 shock swap

    Also maybe if you are going to keep the modded air box lid you could print another lid with just 2 x 25mm small holes instead of the 6 in your design. I know the coober - k&n type open lids are popular mods but I think they allow too much air in. My lid mod has just 2 small holes, just enough to...
  10. Jester1971

    track bike build log - Vitpilen 401, 2017-2023 R1 shock swap

    You could try an idle ecu reset. Just start your bike but do NOT touch the throttle, let it idle for OVER 15minutes without touching the throttle but NOT MORE than 16 minutes. This should allow the ecu to self adjust to the fuels. I did mine for 15.30 on the stopwatch and could hear the rpm...
  11. Jester1971

    track bike build log - Vitpilen 401, 2017-2023 R1 shock swap

    If I were you I would try dropping the oil to say, 160 or 170mm and see if you gain some travel, if you have measured the coil gap and you think it has the room for the 142mm travel the answer could be in the oil volume. I think Hyperpro springs are progressive not linear. There is a couple of...
  12. Jester1971

    track bike build log - Vitpilen 401, 2017-2023 R1 shock swap

    In the UK, Brooksuspension.co.uk. I do not know if you can get YSS stuff in US but the part number is shown on the box in the second pic. Yes sorry 142mm of travel. It’s been a long day…..
  13. Jester1971

    track bike build log - Vitpilen 401, 2017-2023 R1 shock swap

    Your spring will be binding up as it is too short there is not enough space between the coils for 147mm of travel. I went with 180mm air gap for oil as 440ml was very stiff causing hydraulic lock up at 3/4 travel.
  14. Jester1971

    track bike build log - Vitpilen 401, 2017-2023 R1 shock swap

    KTM 390 adventure springs from YSS fit perfectly.. If you had asked I could have saved you some time…
  15. Jester1971

    track bike build log - Vitpilen 401, 2017-2023 R1 shock swap

    Good work, the R1 has a linkage rear suspension which would explain the soft spring. Regards the spring rate my 23’ Svartpilens Nitron has a 140nm (800lb) spring for a rider only weight of 90-95kg. I like it a lot.
  16. Jester1971

    Fork seals replacement for 401

    A member on this forum (Kkmann) did a spring swap on his 401 and used SKF seals. Here is a screen shot from his thread…. You can read it if you search fork spring swap whilst in the 401 section. Sorry I do not know how to do links etc. Hope this helps.
  17. Jester1971

    My New Svart 401

    Sorry but I would put in a link if I knew how but I am not good on tech. If you are interested in the types of rubbish roads I ride and have some time to kill there is a video on YouTube, just type in “riding motorcycles in Suffolk” it is the one titled “do you always ride like that” or...
  18. Jester1971

    My New Svart 401

    I only use first for pulling away or really slow manoeuvres in traffic which I barely ever drive in. I cannot think of a corner where I ride that second gear would be too high of a gear. We have no switchbacks here in my area of the UK. The last time I was out I noted the revs at 70mph in 6th...
  19. Jester1971

    My New Svart 401

    Ohh!! Forgot my new Ergo seat. Much more of a firm ride, like “sitting on top of” firm not “sitting in” soft like the standard. Not sure if it is worth the £150 price but I will let you know after a longer ride, I could only manage 90 mins today as my hand was aching. Pics.. Material is not...
  20. Jester1971

    My New Svart 401

    Quick update, I ordered a 42 teeth Afam rear sprocket a while ago and because I had some downtime after a hand operation I fitted it to test the difference. Well I like the slightly milder acceleration, it goes through the gears at a slower rate now. I always felt that the gearing was a little...
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