2015 Sherco ST 300

Discussion in 'Trials' started by Tomb Raider, Sep 17, 2016.

  1. Tomb Raider

    Tomb Raider Been here awhile

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    Well I'm now an owner of a nice Trials bike and need to learn how to ride this thing. A tad bigger in the CC's than I needed, but price and condition was a ( Can't pass it up ) deal.

    Youtube here we come. Oct 2nd is the last of the year Competition in my area with the PST. I'll try and get ready and jump on in. And feel free to tell, YELL or what ever at me on this new Game.

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    The Guy I got it from took very good care of this bike, has upgraded to a 2017 Sherco St 300.
    #1
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  2. nevgriff64

    nevgriff64 ɹǝpun uʍop ɯoɹɟ buıɥɔʇɐʍ Super Moderator

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    Congratulations on the new bike, TR. :thumb
    #2
  3. motobene

    motobene Motoing for 46 years

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    One of my school students has that bike. I spent some time on setup and mods. I was favorably impressed. Torqy bike, and having the air intake right under the helmet gives lots of auditory feedback for throttle inputs.
    #3
  4. Tomb Raider

    Tomb Raider Been here awhile

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    Mods ?
    #4
  5. lineaway

    lineaway Long timer

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    For a new rider. 9 tooth counter shaft sprocket, flywheel weight and black tube throttle.
    #5
  6. Tomb Raider

    Tomb Raider Been here awhile

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    Clutch seems grabby, picture looks like a Honda clutch. Basket grooves up, these do that ? Plastic side cover, O-ring gasket ?
    #6
  7. lineaway

    lineaway Long timer

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    ding ding wrong question
    Really that bike does not have time to groove up.
    If you re-gear it you will not have to use it as much.
    Any minute some crazed engineer will have you throw away half the clutch.
    #7
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  8. lineaway

    lineaway Long timer

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  9. 1fxstbi

    1fxstbi Been here awhile

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    Try changing your transmission fluid and use Maxima 75. Works good in my '15, 300.
    #9
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  10. jonnyc21

    jonnyc21 Trials Ninja

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    When riding in muddy or sandy conditions you might want to put a bit of tape over the fuel filler cap to prevent dirt, sand, or mud from getting stuck around it and in the fuel tank during fill ups... isn't critical but seen a few posts about it in the past.
    #10
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  11. 10K

    10K Trail Runner

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    Applied those upgrades to my Beta. Definitely helped!
    #11
  12. motobene

    motobene Motoing for 46 years

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    Very easy mod to fix that clutch is remove two of the six clutch springs. I did that to my student's ST300 and it became very significantly easier for him to control.

    A great oil just makes the clutch work a little better, but if you are afraid and don't do the minus two springs mod, you will miss out on the clutch working a lot better.

    As for gearing down, that can help too. Compared to a GasGas, however, I have found the Sherco needs gearing down a little less.

    Unlike stock GasGas at 42/11, there is no 11-tooth on the Sherco, so if you gear down on the front you go from the stock 10 to a very dinky 9, which icreases chain wear due to the dinky radius. That also steps the final drive down to 4.67 to 1. I'd go down less by fitting a 44-tooth rear, which gives you 4.40 to 1, versus the stock 4.20 to 1. This solution fits the 250 well.

    On a 300, with its greater torque, perhaps all you need is a 43-tooth rear. Putting a 9-tooth front on a 300 could make 1st gear feel really quite low. Not a bad thing necessarily, and it is one way to bring the too-tall 4th gear down. A negative to a 9-tooth is the small pitch diameter which increases chain wear a bit.

    However, improving the clutch by lessening lever pull and widening the slip zone can get you there without quite as radical a change in the final drive even if the 9-tooth mode is easily reversible and doesn't cost much.

    The clutch mod is easier if your chain doesn't have a master link (mine doesn't), and costs nothing at all but a few minutes. You don't even have to drain the oil. Just lay the bike on the left side, remove the clutch cover, and remove two spring directly opposite and their fasteners. Takes all of 10 minutes.
    #12
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  13. Tomb Raider

    Tomb Raider Been here awhile

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    Bike had it's oil changed every 3-4 rides with good oil along with mix oil. Today I greased and lubed throttle tube and cable. Adjusted controls to my liking. Road around home for about an Hr. My place isn't flat, has woods, Ex Mini bike track so I have some good stuff for now. Did lots of tight turns in loose dirt. Clutch seems better sense I have some Bar time on it. But man, not like dirt or street bike riding at all. I think I will leave the fly wheel and sprockets alone. Season coming to and end fast out here. Thanks for the input.
    #13
  14. lineaway

    lineaway Long timer

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    If you ride more wet the flywheel weight will help. The 15 came with the 10, the earlier models came with the 11. Trials is about slow, the 9 will make you more in control sooner. New riders think they can ride anything. Trouble is you have to turn. The 9t cs. shaft is the cheapest thing you can do if you are going to compete in the lower classes. If you are in the top class, I would go back to an eleven if you are close to sea level. Motobene`s idea of four springs in the clutch is ok if you are a new rider in a lower class. We have rocks 100ft plus, you need all six for those. Have fun. PS. Levers need to be almost parallel with the bars.
    #14
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  15. Tomb Raider

    Tomb Raider Been here awhile

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    I have the stock bars with no grips. Want to try them out, different bend. What is good grip for trials if there is any ? I like sticky.
    #15
  16. motobene

    motobene Motoing for 46 years

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    Really? You watched this new rider since 1986 ride the 100ft-plus rocks at Lake Fork and also Sipapu this season with 4 springs!
    Sorry for saying something negative about the 9-tooth sprocket :jump

    I expect resistance, assumptions, and fears about this mod. Unfortunately the fears reduce experimentation and reporting, positive and negative.

    Time for me to take a lesson and buy, try, and report on a 9-tooth sprocket :wings
    #16
  17. lineaway

    lineaway Long timer

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    Bene, the mod works for many. But not the more aggressive types. The better riders need more spring. Nothing wrong using what works for you! You going to Roswell?
    #17
  18. motobene

    motobene Motoing for 46 years

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    I like most trials bars, some better than others.

    Grips are a matter of opinion and preference, and I prefer the thinnest grips, which are what wisely some on bikes. I buy about 6 pair of S3 grips, the standard black ones, at a time, and that lasts me years.

    No bar end plugs for me!

    If the ends of the bar are open, however, I drive in machined plastic plugs flush so if you drop the bike the grip ends they don't cut as easily. If they do cut I use silicone seal or a resilient glue and electrical tape to get by until I replace the grip.

    Mounting grips, I pour a little bit of water inside the grip then fling it out just before slipping them on. I fit them, then float them onto the bar and throttle pipe with air pressure. With no holes cut out for bar end plugs the grips will float on easily under pressure. No glue nor electrical tape!

    I 'safety' wire my grips on with 0.025" Malin stainless steel wire:

    https://www.amazon.com/Malin-MS20995C-Stainless-Lockwire-Canister/dp/B00945V9EI

    Double loop on the inside and outside of the left and right grips. That keeps future water from getting under the grip from either ends so the grips stay put even in the worst conditions.
    #18
  19. motobene

    motobene Motoing for 46 years

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    Guess I'm not a 'better rider' then.

    Planned to do Roswell, then got the invite to ABQ balloon festival at Doc Joe's with high school and college friends, and the wife preference. Sigh.

    Not all bad, as not competing will give my stupid back more time to heal. I have a trials training class to teach 2 weeks later in October and need to be 100% for that or I won't be able to be 'aggressive' and 'better' enough during demos for credibility :-)
    #19
  20. lineaway

    lineaway Long timer

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    Margirita's per Doc Joe!
    #20
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