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Smooth Gear Changing

Discussion in 'Yamaha 250cc In-Line 4's' started by bobbi12, Mar 11, 2006.

  1. bobbi12

    bobbi12 New Member

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    Hey guys when i ask this question please don't laugh ok. I'm pretty new to the manual bikes right and i'm changing the gears somewhat ok but i dont feel i'm doin it the right way(not shifting and downshifting smooth enough) and every now and then the bike manages to stall. I lnow it will take sometime to get it smooth and right but i dont want to damage the gearbox so any advice on helping me get that smooth shift and downshift would be grateful.
     
  2. ACE

    ACE Active Member

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    Dont rush but dont do it slow IMO this is a sport bike and it wonts quick shifts. Some times I rev it on down shifts just a bit to make it smoth
     
  3. Boz

    Boz New Member

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    it is pretty difficult to ruin a bikes gear box. Eventually (with practice) you will figure out just how much throttle is required when letting the clutch out each time. I am sure everyone when learning managed to stall quite a bit...
     
  4. TiMBuS

    TiMBuS New Member

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    I've stalled it, even recenty, and worst of all the petrol tap was off (careless me. explains why it stalled so easy tho)
    Ever sat at the lights fogging up your helmet with expletives waiting for your floats to refill so u can start the bastard, while cars whiz by? Not cool.

    Also. If it stalls so easy I suggest slower clutch release and rev it higher when you take off. I know it seems weird to have to rev it to 4-6krpm just to take off, and people probably look at you funny, but you'll notice a lot less stalling. PROTIP: Rev it to 10krpm before releasing the clutch for a fun takeoff!
     
  5. mrcleen

    mrcleen New Member

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    i just have a query, the gear lever on my steed is set a bit high so u really have to give it a kick up when going from 1st to second, and when i on the odd ocassion miss 2nd and hit nuetral, i go to put it into 1st and it clunks a bit when catching, is this normal. from what i can tell this is the only time i hear the gear box make any weird noises
     
  6. koma

    koma New Member

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    Id start off my saying adjust the gear lever to the lowest comfortable point so the up gear changes are less of effort. Gear changes shouldnt be something you need to think about - they should just happen intuitively.
    Aside from that, you need to learn an action on your bike that doesn't make a clunk noise when shifting gears. Usually it just needs a firm and direct push from your foot and it'll shift smoothly, otherwise perhaps your not disengaging the clutch properly.
     
  7. ACE

    ACE Active Member

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    Is the dot on the gear shaft lined up with the slot in the lever
     
  8. TiMBuS

    TiMBuS New Member

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    Clunking from neutral to first is fine. It's the gears kicking in and even though your clutch is in, because it's wet it never fully 100% disengages. You may notice the bike ever so slightly jerk foward for half a second. Not uncommon.

    If you're referring to some other noise, perhaps you should freak out.
     
  9. ArmyLad

    ArmyLad New Member

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    ok, I'm going to ask something that would probably get me laughed at by most people, but i kinda need to know <!-- s:oops: --><img src="{SMILIES_PATH}/icon_redface.gif" alt=":oops:" title="Embarassed" /><!-- s:oops: -->
    My question is this: How to you change gears?

    After you have finished laughing ( <!-- s:roll: --><img src="{SMILIES_PATH}/icon_roll.gif" alt=":roll:" title="Rolling LoL" /><!-- s:roll: --> ) i will clarify my question further.

    I do know how to change gears. clutch and accelerator and what-not, but the this is my first motorbike. Am I correct in thinking that you push the gear lever DOWN from neutral into first, then to get into second and above you LIFT the lever to go out of first, past neutral and into second? I think I am right in my thinking, but it never hurts to ask/check (except your ego :p)

    Thanks.
     
  10. Trev084

    Trev084 Active Member

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    Yes, this is where the term 1 down, 5 up comes from, just pull up on the lever in one movement until it stops and release it, you will work out what I mean.
     
  11. ArmyLad

    ArmyLad New Member

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    Thanks for that Trav. Good to know im not completely off the tracks :p
     
  12. deadbirds

    deadbirds New Member

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    dont be embarrased. its one of those things no one ever actually tells you how to do it. lol.
    i remember sitting on my driveway and wondering why it allways stalled when i tryed to pull off unless i really gave it some, turned out that first gear helps.
    practice makes perfect. then makes for cutting corners. then makes for not using the clutch. then makes for new sprokets.
     
  13. rodeobob

    rodeobob New Member

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    The gear box in a motorbike is nothing like that in a car so you can not compare it.

    Car gearboxes have syncronsing rings that are on the edge of the gear and drag on the gear to help get the gears spinning at the same speeds so they will mesh together. Take these rings out of Ma and Pa Jones' daily driver and neither of them would have a hope of driving it.

    The gearbox in a motorbike is a 'dog' box. It has a gears with teeth that engage in another gears with holes in them.

    How that works is that changine gears you have to match your engine RPM to your road (wheel) speed for the given gear you are in. (Thats the same as a big truck)

    You have to be fairly brutal with a bike gearbox to hurt it.

    Basically you have little choice but to sort of force the upshift. I rarely use the clutch on an upshift. Just roll the throttle off and kick it with your toe and its nice and smooth. Practise, even hopping on a new bike for the first time can be a clunky thing for an experienced rider.

    On the down shift, if you give the throttle a blip/rev, and give it just the right amount it will be a super smooth shift.
    Let the revs drop too far on a down shift and when you let the clutch back out you can actually compression lock the back wheel (thats where spinning the engine up a few thousand revs takes more effort than the tyre can handle so the tyre breaks traction.)


    Bob.
     
  14. Romantix1

    Romantix1 New Member

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    practice makes perfect <!-- s:) --><img src="{SMILIES_PATH}/icon_smile.gif" alt=":)" title="Smile" /><!-- s:) -->

    Soon enough you'll have your clutch poppin out @ 12krpm and have the front wheel pop up on you <!-- s:D --><img src="{SMILIES_PATH}/icon_biggrin.gif" alt=":D" title="Very Happy" /><!-- s:D --> (with confidence)

    Just ride everyday, starting/stopping @ lights you wont have a choice but to be perfect, it'll all become second nature just like driving a car <!-- s:) --><img src="{SMILIES_PATH}/icon_smile.gif" alt=":)" title="Smile" /><!-- s:) -->

    Bob mentions not using the clutch for upping gears, i would recommend not getting into this habit <!-- s:) --><img src="{SMILIES_PATH}/icon_smile.gif" alt=":)" title="Smile" /><!-- s:) -->
     
  15. rodeobob

    rodeobob New Member

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    Yeah i got bad habits.

    Pictures tell a thousand words.

    This is a bussa box but same deal as your FZR

    [​IMG]

    Theres 3 sets of gears. A gear on the left, dog in the middle and gear on the right. One is spun and the other spins when its engaged. Different sizes (tooth counts) mean different ratios. The groove you can see in the middle of each dog is where the shift fork goes.

    Not much too them, thats why they can be clunky.



    This is a good example, main shaft out of a land rover.
    [​IMG]

    The gold coloured rings are the syncro rings, as the 'dog' slides over the syncro ring the drag of the rings helps to speed up or slow down the non driven gear so the gears mesh together easily. If a syncro is badly worn IE: no drag, thats when you get a crunchy gearbox.


    Bob.
     
  16. Trev084

    Trev084 Active Member

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    There is no harm in not using a clutch with upshifting on a dog box, is really no different to using it with the clutch.

    You can also rev match shifting with syncro boxes, just keep momentum and blip the throttle between the gears.

    Driving a car with stuffed syncros in another story, does not matter if you use the clutch or not, 9/10 it will still crunch.
     
  17. FastFizza

    FastFizza New Member

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    Upshifting without a clutch aka race shifting (not to be confused with race-shift which usually refers to a reversed gear pattern 1 up 5 down) is like bumb starting your bike. Its not the "best" way to do it, but it doesnt do anywhere near as much damage/wear as you think. Having raced motocross for years and never used a clutch once to upshift i can confirm that your gearbox will experience very little, if any, noticeable increase in wear. Like Trev said, theres really no harm in clutchless upshifts with doxboxes and the main reason to use a clutch on the down shift is to A) avoid compression locking the rear wheel (which is why race bikes have slipper clutches <!-- s:D --><img src="{SMILIES_PATH}/icon_biggrin.gif" alt=":D" title="Very Happy" /><!-- s:D --> ) and B) because if you dont match the revs it usually is kinda difficult to do it nicely without one <!-- s:shock: --><img src="{SMILIES_PATH}/icon_eek.gif" alt=":shock:" title="Shocked" /><!-- s:shock: -->

    A good rule of thumb is use the clutch whenever you're out for a ride, up AND down shifts. But when that gay faggy boyracer pulls up at the lights and revs his 1.5tonne car, ride the clutch like f*ck off the line and slam clutchless into 2nd, then 3rd, then 4th and 5th... then you can slow down and open your visor and grin smugly as he catches up
    <!-- s:biker4: --><img src="{SMILIES_PATH}/th_Biker_4.gif" alt=":biker4:" title="Biker 4" /><!-- s:biker4: -->
     
  18. rodeobob

    rodeobob New Member

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    You dont even have to slam it clutchless, just hold your toe under the gear lever with gentle pressure, when the engine RPM fades out it will suck up the new gear like a kid with a tub of YoGo.

    The above is not very good for your gearbox.

    Bob.
     
  19. deadbirds

    deadbirds New Member

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    clutchless downshift is fairly easy too. just not very nice on my bike because the exhaust is made of holes.
     
  20. HptK

    HptK New Member

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    Holes?
    All of my exhausts have
    Code:
    
    
    holes in them.
    Including my arsehole.
     

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