2017 Sherco Factory 125

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

  1. Norman Foley

    Norman Foley Devotee of the Husqvarna

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    Bike had a 50 stock, but ran better when it was a touch cooler with the 55 that Motobene suggested. My Jitsie jet kit doesn't have a 52 or 52.5, so I'm not sure there is one. I'll check Sudco....

    There is a 52.... I'll order one.
    #41
  2. lineaway

    lineaway Long timer

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    A 52 is what I have in my 250 Beta right now. All I did at the Nationals was jump frm 115 to 120 to a 125. Ran awsome.
    #42
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  3. Norman Foley

    Norman Foley Devotee of the Husqvarna

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    I just ordered a 52. Thank you!
    #43
  4. lineaway

    lineaway Long timer

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    Any way to make cattle sleep besides shoot them. They have been rowdy and loud all evening.
    #44
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  5. Norman Foley

    Norman Foley Devotee of the Husqvarna

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    Pray for rain... they always lay down when it's coming!
    #45
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  6. motobene

    motobene Motoing for 46 years

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    Cattle have parties! Mine get like that when they party or something is wrong, like a fence is down and two herds are mingling.

    52 is a good option, perhaps the better one, but it is OK to compensate with the air screw.

    At least the modern Sherco 125 comes with a 50 to begin with, and we're not having fear filled back and forth over whether or not the bike will explode with a 48 :-)
    #46
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  7. 2whlrcr

    2whlrcr gooligan

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    Play them Rawhide reruns.
    #47
  8. Stolen Time

    Stolen Time n00b

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    I am Norman's friend on the "heavy and bulky" '17 Scorpa SC250. Although this is a 125 thread, it is talking about jetting, so thought I would throw in my experience with the jetting changes I have made on my SC250. Before we rode last night, Norm mentioned that he had adjusted his jetting on Sunday and was pleased with the results. I was just getting ready to test my latest changes to mine made on Tuesday. The progression has led to a 48 pilot and a 120 main, with no changes to the needle position....yet. Ended the session with the air screw 2 turns out. As Norm mentioned, we did mainly side hill off camber work.
    The changes made a very welcome change to the off throttle response an low end smoothness and grunt. I do also have Carbon Tech reeds installed, but do not have a before and after evaluation of their effect as they were installed before I picked up the bike. I did have them in my 125 Scorpa last year and they made no difference at all to that one.
    Because of limitations to my clutch finger (old guy) I try to limit the use of it and find the grunt of the 250 to help with that. I too was very disappointed with the stiff pull but added a lever with a shorter pivot to pin length and it helps. Funny thing is, my bike came with a leaking slave cylinder. When Mike Komer did the warranty repair, it became very manageable. I no longer have to switch to two fingers half way through a session. Feeling bad for Norm though. His is still very stiff.
    #48
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  9. motobene

    motobene Motoing for 46 years

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    I just fit a 10-tooth countershaft sprocket to the 125. The Sherco 125 has so much grunt for a 125 I wondered why the final drive gearing was set so low (56/9).

    I'll need more time with this change. I creeped up some rocky hills no problem.
    #49
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  10. motobene

    motobene Motoing for 46 years

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    Rode the 125 again, this time more aggressively.

    The 10-tooth sprocket is staying. That steep climb I was doing in 4th requires more slipping on the run-up, but the bike can still get air at the top. 1st thru 3rd have a bit more spacing, which was needed. 1st gear is still quite low.

    Storms coming in and that means lower air pressure. The 55 is still working great, air screw 2 turns out, so that is staying too.

    When the new 250 comes it will be interesting to see if the low-speed jet is still a 42, which would be, again, ridiculous. The '16 got a 52, which was right. The '17? We shall see.
    #50
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  11. Norman Foley

    Norman Foley Devotee of the Husqvarna

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    One man's meat.... 250 works great for you!
    #51
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  12. Stolen Time

    Stolen Time n00b

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    I do agree that the 125 is a great bike and all the power that is needed in most situations, but I am loving the 250 for my own special needs. See you Sunday at the D4.
    #52
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  13. motobene

    motobene Motoing for 46 years

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    I have given the 125 and 250 issue a lot of thought, now that I am getting intimate with both.

    The advantages to the 125 I find are easier precision creeping and better retention of traction on slopes. The shorter-stroke crank allows my bogging way down without stalls or unexpected flame-outs.

    The 125 is also easier starting and with a lighter feel. This reduces intimidation factor. My wife, for example, is obsessed with her perceived inabilities with kick-start bikes. Sherco is an easier-starting bike than my former Gassers, so I hope the 125 will not cause her problems. If so I'll never hear the end of getting rid of her 80 :-0

    A significant disadvantage to 125s I've found regards less available torque and the effect that has on the final drive gearing and the practical width of application for each gear.

    What final drive gearing (sprockets) end up feeling right is pegged to the available engine torque. It's why the 2017 125 comes with 56/9 instead if the 44/9 of the 250 and 300.

    Running 44/9 on a 125 would have the low gears feel way tall, and the little motor would have difficulty pushing the bike in 4th and 5th. That low final drive helps with precision creeping, but it is responsible for narrowing the scope scope of each gear.

    At the other end of the spectrum are 300s which just drip with torque. A 250 doubles the displacement over a 125, with 300 being just 50cc more, explaining why the gearing is the same for both.

    I'm finding that though the 125 is more flickable than a 250, the 125 is requiring more body effort from me, particularly when hopping the rear end with engine assist. This effect is especially noticeable new Factory versions having the over damped Ohlins shock pre break-in.

    I also noticed my arms getting tired a bit quicker on the 125. I'm not sure if this has anything to do with ergonomics it not. The 125 won't get my 0.30" spacers under the handlebar clamps, as the 125 is for wife and trials school students.

    I am very impressed with the Sherco 125's power! Paxau or someone has figured out some great cylinder porting! The GasGas 125s are stronger on top than the Sherco, but the Sherco rocks in the bottom and mid, which is where 125s are traditionally weak. I haven't tried the 125 Beta, so I have no experience or opinion.

    My fav size is still the 250, overall. I have said if there was a full 200cc motor available on the longer-stroke crank and full size flywheel I'd be tempted. I have ridden a 2017 Beta 200 that was quite nice. The power was right and adequate. A little more fire breathing as is typical with the Shercos would fit my personal preference on some theoretical 200.

    With some classes being pegged to 125s, and the bigger sizes being the main draw, I doubt the 200s will ever really make a comeback.
    #53
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  14. motobene

    motobene Motoing for 46 years

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    Rode again yesterday during some free training for the fellow that bought my GasGas 225.

    During an exercise clutch slip creeping up a slope I found out the 10-tooth (versus stock 9 tooth) sprocket is a touch tall. Any kind of pace and it is fine, but I'm homing in on how it's probably unavoidable to depart from a 9-tooth front sprocket for lower-skill end of the bandwidth of riders. Also, adding altitude will further make the 10 tooth tool tall.

    The only choice for optimization is a smaller rear sprocket with the 9 tooth.

    Looking at the final drive numbers:
    56/9=6.2 (stock)
    55/9=6.1
    54/9=6.0
    53/9=5.9 (in between)
    52/9=5.8
    51/9=5.7
    56/10=5.6 (a bit tall)

    I wonder how hard it would be to come up with a 54 or 53? Checking on it. For now the 9 tooth will go back on because the next slated event to bike will see is at altitude and it will be ridden by my wife.
    #54
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  15. motobene

    motobene Motoing for 46 years

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    I competed in a Texas trial yesterday on the 125. 9 points, most of which were related to lack of - for me - a rear brake on the live foot.

    The 10-tooth countershaft sprocket made the precision-creeping gear too tall, but it was passable. The non-hyper nature of the new clutch helped in that regard.

    The bike sure ran awesome! Had several test riders who came off the bike amazed at the power. One fellow, a Master rider, thought he was riding my new 2017 250, commenting how it was so light! Then someone pointed out it was my wife's 125. He didn't really notice it was not a 250!

    A very young rider's Dad rode it and came back saying how nice it was, called his kid in off his 300 Scorpa, and put him on the 125. Kiddo returns all smiles. Dad says, "Uh oh. That's an expensive grin."

    About the 55 low-speed jet, it's just a touch on the rich side because the bike needs a little too much crack of the throttle to start even after opening the air screw to 2 turns out. I'm dropping back to a 52 (stock was 50).
    #55
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  16. Norman Foley

    Norman Foley Devotee of the Husqvarna

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    Agree on the PJ.... I'm having to run 2 1/2 turns out when it's warmer, so going from 55 to 52 also. A back bleed of my clutch and black Jitsie lever, has improved clutch pull on my SC model.
    #56
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  17. motobene

    motobene Motoing for 46 years

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    The bike ran great with the 55! No blubbery putt-putt throttle style of course.

    My clue to a bit too rich was the need to open the throttle a bit more than I prefer when hot starting.

    The 52 should get me plenty of fuel for heavy loading at lower rpm, and allow me to back off a tad on the throttle when hot starting.
    #57
  18. Norman Foley

    Norman Foley Devotee of the Husqvarna

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    We're on the same page. 55 makes it run well, but hot starts on our first 80 degrees and humid day got very fussy. As a novice... I hot start more often! 52 sounds like the best choice.
    #58
  19. motomofo

    motomofo Been here awhile

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    I need to ride that thing next time I see you, Chris. You made it look great in the section I was judging Sunday AM!
    #59
  20. nwcycle

    nwcycle Long timer

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    Getting back to the chatter..... When I first got my daughter a 200 in 04 and the rattle was unreal.
    I ran into Andy at a dealer show and he explained what his product does..
    I sent the piston out and he coated it with .002 with his coating, It took me a but to think that .000 clearances
    But after I put it in and broke in, it was unreal. all I heard was the bearings wirring around
    I have been using his coating on about every high end rebuild and have 100% success and no issues...
    This is a great way also to freshen up top ends mainly because you can reuse the piston and replace rings saving $$$$$
    This is a very affordable process also ( approx 60.00 ) with shipping both ways
    Just my .02
    https://www.line2linecoatings.com/video3.html
    #60