2017 Sherco Factory 125

Discussion in 'Trials' started by motobene, Apr 14, 2017.

  1. motobene

    motobene Motoing for 46 years

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    I've sold a bunch of fine trials bikes, finally! This has cleared the way to be a Sherco-only business, except for retaining my one-owner '89 Fantic ACM-class bike.

    My demo ride will be a 2017 Sherco Factory 250. May the new 250 be as yummy as the 2016 Factory 250 has been!

    The 2017 Factory 125 will arrive first and will be a demo bike, a schools rental bike, and Claire's personal ride. I hope she takes to it well. The 125 will be a new riding and tuning experience for me.

    Anyway, this change of stable will allow a deep and personal exploration of two versions of the new clutch, a smaller motor, and of other fine details.
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  2. Ditch

    Ditch Long timer

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    Coming to Sipapu in June? Watcha bringin'?
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  3. Beatprojim

    Beatprojim Beatprojim

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    Last year one of our female riding buddies got a 16 Sherco Factory 125. Everyone that rode it fell in love with it and had a blast!
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  4. motobene

    motobene Motoing for 46 years

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    I have heard reports of the Sherco 125 being powerful enough to surprise the 300 riders, as in something like, "Hey even I could own one of these."

    I'd prefer about 50cc more, but we shall see. I'll be able to get quite intimate with this 125.

    IF domestic tranquility allows Sipapu, meaning she will come with me :-), we'll both be on the '17 Factory bikes.
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  5. ADVCoop

    ADVCoop Long timer

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    I gave a 125 a lot of consideration when I was bike shopping this last time. I have considered trading this 300 4T for a 125 so my wife could ride while I am down with these back issues. She can't kick the 300. She has ridden it but I had to start it. I can't start it right now for her. 125's are fun and at my trials riding level make plenty of power.
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  6. motobene

    motobene Motoing for 46 years

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    The 125 is here already! (It shipped fast). I will gut it from its crate tomorrow, replace it with my 2016 Factory 250, which is going to it's new home in Austin.

    I'll get to know the 125 quite well, soon, but I have customer bikes to finish and cows that must be worked first....
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  7. Norman Foley

    Norman Foley Devotee of the Husqvarna

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    I think you'll be impressed with the 125..... I love my '17 Scorpa 125 SC.
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  8. motobene

    motobene Motoing for 46 years

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    Well it is in, assembled, and part way through my usual several hundred setup steps.

    The bike came with coolant and oil, and I found fuel in the carburetor. It refused to start so I pulled the plug and found the bottom-end flooded nicely. 20 or so kicks later the offending overage of fuel was sprayed out onto paper towel, the 1/2" reach plug was replaced, and she started right up.

    Oh BTW, the factory setting for the air screw was 1/16-turn out so there it was, classic too-lean syndrome! I rejetted immediately, before starting the bike, from 50 to 55. Educated guess resulted in close to 1-1/2 turns out on the air screw, so the 55 is righter than 50.

    The main I took from 122 to 120, which, other than a slightly lean float angle, is so close to where I ended up on the '16 Factory 250 jetting at 120 and 50, and with Boyesen CarbonTech reeds to get rid of bottom-to-mid 'dirtiness.' will this bike respond favorably to CarbonTech reeds? We shall see.

    Why Sherco assembles control levers so far outboard on the bars at the factory is a mystery. That makes index fingers way choked up on the levers. Fixed that.

    First Test Ride
    The Sherco Factory 125 immediately impressed with gutsy power off bottom that was fun to burp on at a flick of throttle. Every hill I have seems flatter, as the traction is maintained while creeping up.

    Odd how a bike that weighs about the same as, and is 98% identical to, my 250 Factory can feel 25% lighter from the reduced engine inertia. EVERY part is the same as the 250/300 except the crank, top end, and probably ignition advance curve, and pizza-size rear sprocket.

    One way to tell a '17 125 is the pizza-size rear sprocket, which is even more silly looking due to FIM's requirement to cover sprocket web holes. But regardless of size the gearing works.

    I think this bike could pull a 10-tooth sprocket, however, but at times in 1st the 9 tooth seems right. That it is so low geared comes out as I can do things in 3rd I'd normally do in 1st on a 250. Very slow precision creeping requires such low gearing with the small motor. But still, it seems a little off.

    Claire has yet to ride it, but I think she will be stunned at how easy to ride (and start) this bike is. The handling is vastly superior to her former Beta 80. So good one can just thinks and the bike goes exactly there.

    This is the first 125 I've ridden that I would choose to compete on and not think about being at a constant disadvantage. The 125 in fact provides some advantages, in traction and tight, slow work, and in reduced rider fatigue except on really big ups.

    And the new clutch is to die for! The revised clutch in the factory 125 having 0.016" less diaphragm spring preload than early production 250s and 300s, plus an old style AJP master cylinder (that does what?) is to-date the best feeling and performing clutch I've experienced in ANY trials bike, ever!

    I hope my coming 250 clutch has the same incredible feel!
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  9. motobene

    motobene Motoing for 46 years

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    My only criticism of this particular 125 regards engine noise just above idle when dithering between power and engine braking. It makes a sort of loose flywheel knock noise as though the big end of the rod has too much running clearance and the to noise is resonating from the flywheel.

    My motor is very smooth and quiet except when compression pulses excite angular acceleration reversals in the crank. I'll pull the cover and do a sanity check. The excitation turned out to be from primary gear reversals of running clearance and that does no harm.

    Any you other Sherco 125 owners find this characteristic in yours?

    I must admit to being surprised to have a Sherco motor with 'individuality noises' of the GasGas Pro type.
    #9
  10. heffergm

    heffergm Long timer

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    It's not a lean knock?
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  11. motobene

    motobene Motoing for 46 years

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    Definitely not lean nock (I can spot that immediately). The 55 low-speed jet took it outside of lean.
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  12. Norman Foley

    Norman Foley Devotee of the Husqvarna

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    I don't get that knock sound from my '17 Scorpa 125SC..... Clutch seems a little noisy at idle to me and quiets down when you pull the lever in.

    Jetting.... I'll confess that I haven't checked what is in it. My air screw (AS) was set at 1/2 turn out, as was the '17 Scorpa 250SC delivered at the same time. I've ridden it from 19F to 75F with only AS adjustments from 1/2 to 1 1/2 and the bike runs smooth and strong. We ride at about 1000-2000' ASF.

    Mike Komer tried the thinner spring retaining plate in my 125SC and made no change, so master cylinder must be a key piece of the puzzle. Of all the '17 bikes Mike sold, Sherco Factory 250 has the lightest pull and my Scorpa 125SC has the stiffest. My clutch works well, but I miss the light pull of my '17 GG 125 TXT.

    Gearing works for me as a I am doing a lot of tight turning. I've been doing some steep off camber with slow steep uphil turns and it pulls right up them. On the loop it's easy to shift between 4th and 5th, which is a blessing compared to GG 125.

    I have ridden my friend's '17 Scorpa 250SC and it feels heavy and bulky compared to my 125. I just don't see a 250 in my future, but possibly a 125 Factory for my next bike.
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  13. motobene

    motobene Motoing for 46 years

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    The master cylinder change is still mysterious to me, as both types use the same 9.5mm diameter.
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  14. motobene

    motobene Motoing for 46 years

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    Asked Ryan about the rattle noise and he says it is does show up on the 125s. Also, he said, "The 200s were worse."

    So here's what I think is happening: The smaller flywheel on the shorter-stroke motors is 'ringing' with the energy pulses.

    Given the flywheel us smaller, there is room between flywheel and cover for some kind of sound damping material, like a foam or a rubber. Something to damp sound and also change the resonant frequency.
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  15. motobene

    motobene Motoing for 46 years

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    Rode the 125 today. My revised jetting is superior. These Sherco motors are strong bottom -to-mid, then flatten off at higher rpm. I should throw in some Boyesen CarbonTech reeds to see what happens.

    The clattery noise has been found. It's radiating from the contact region between the small and large primary gears. It's from the particular mass of the crank and flywheel and engine pulses interacting with the running clearance of the primary gears. The 125 just lights up in this noise stronger than the 250/300.

    Bike seems geared on the final drive a bit low via 56/9=6.222 sprockets. I will try 56/10=5.60. As is, I ride mostly in 2nd and 3rd. With the 10-tooth sprocket 1st may become more useful, and the spread of 1, 2, and 3 wider. As is, 3rd is a little low for the big hills, and with Sherco 4th is rarely a gear you can use in a section anyway.
    #15
  16. lineaway

    lineaway Long timer

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    I thought the 125 was for the wife?
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  17. Norman Foley

    Norman Foley Devotee of the Husqvarna

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    I've made a life's work of riding "Wife" bikes and snowmobiles. Ride up to the Tundra Tavern and see the sneers and chuckles when the they notice the 380F stickers on my Ski-Doo! Enjoy that 125!
    #17
  18. motobene

    motobene Motoing for 46 years

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    It's a student rental/Claire bike combo. Right now I'm in between bikes so I can concentrate on learning the 125 intimately. A ride here, a ride there.
    #18
  19. motobene

    motobene Motoing for 46 years

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    A note on Factory models suspension setup. The adjusters come from the factory about a third of the way into their clicks. Both the Tech forks and Ohlins shock are pretty tight and somewhat harsh before break-in.

    I suggest recording number of clicks in, then zeroing everything out during a break-in period, then dialing in some clicks as the suspension speeds up. It takes a while.

    The factory setting seems in anticipation that some riders won't ever touch the clickers, so the settings are for like a year into riding. Before then the suspension can be unnecessary tight for most mere mortals. But you know better now :-)
    #19
  20. heffergm

    heffergm Long timer

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    A year into riding? My Tech's always loosen up after about 10 or 15 hours. The set on bike A with 20 hours feel basically identical now to bike B with 130 hours.
    #20