Question about Mongoose Maneuver Mountain Bike

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The bike keeps shifting gears on its own what is wrong

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This happens when the back wheel is not lined up properly with the bicycle frame. Because the gears are not in a straight line with the chain it can slip. If it slips to the right, away from the wheel, then loosen the wheel and move the end of the wheel next the pedals slightly to the right as you stand behind the bike. If it slips to the left, in towards the wheel, then move the end of the wheel nearest to the pedals to the left. Once the wheel and the chain are in line it should stop changing on it's own.

Posted on Nov 15, 2010

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Posted on Jan 02, 2017

dunnbiker
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SOURCE: 18 speed bike 6 gear shift works fine 3 gear

If the cable is rusty or otherwise binding it won't let the derailleur fall toward the smaller sprockets when the control is moved. Likewise, it may not even let you move the control in the direction that pulls the cable (bigger rings).

If you don't know much about the process I suggest you read this:

http://coachlevi.com/cycling/complete-beginner-guide-to-bicycle-gears-shifting/

and take the bike to a Local Bike Shop for a look-see and maybe a tune-up.

Posted on Mar 16, 2010

  • 25 Answers

SOURCE: 18 speed bike 6 gear shift works fine 3 gear

You have to look if when you act on the shifting level it get hard to move or it is free, if free, probably the cable is broken.
Also check if the cable is not too loose, try to follow the cable track and move the level and see if the cable move with that, in that way probably can find where the cable is stuck or broken/loose.

Posted on May 18, 2010

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if your coming to a stop quick then just pull the clutch in and keep pushing the lever down until it dont push down any further it will only go down 1 gear at a time so you will need to push it down 4 times but you dont need to count you can just keep pressing it down the gears until it dont go down any more then you know this is first, you need to keep the clutch in when doing this.

how ever if your slowing down is more gradual then what you can do is go from 5th down to 4th then let engine slow the bike down then when the revs drop down change down to 3rd and so on until you get ot 1st gear.

if your coming to a stop quick say at lights or junction then if the bike is in 5th gear then you can change down the gears once the bike has stopped just hold the clutch in when you stop and keep tapping the gear lever down until you feel that its not going down any more gears this way you know its in 1st without having to cound down the gears, their id no quicker way of going down the gears to get to 1st.

i hope i have read your question right and gave you the answer you was looking for if i got the question wrong then please explain then i can assist you further ok

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3rd gear har d to put in


Im not sure how you ride your bike but if you "beat on it shifting without cluch sometimes the fork in the transmission gets bent...this is the only reason that would cause hard shifting besides wrong gear lube

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1 Answer

2009 650 Classic: Does not stay in gear, problem getting 1st gear at times. When I bought the bike 1 month ago the problem was there. I returned the bike to Bobby J's in Albuquerque, NM. The service dept....


Wish I could come up with a line of B.S. as good as their service department does. You have a slightly bent shift fork. Tell the jerks to fix it. It is a problem, it is not right, and it is covered under warranty. Tell them you really don't want to get creamed when the bike pops out of gear and doesn't want to go back into gear as a cement truck is coming at you. If you let them stall you until the warranty runs out it will cost you around $1400.00 to get it fixed. Contact the Regional manager for Yamaha ASAP. Google "Yamaha Motor Corporation" http://www.yamaha-motor.com/
What I am afraid will happen is that the dealer will do the repair and install a new shift fork then tell you they could not find anything wrong so you now owe them the cash because Yamaha will not stand the repair cost for a non-existent problem. Send Yamaha a certified letter as to your concerns and insist someone other than the dealer inspect the bike to confirm the problem. Keep a copy of the letter and the postal receipt. Is there another dealer in the area?

The diagram below shows how a shift fork moves a slider gear left and right to change gears. A slightly bent shift fork would not let the slider gear "dogs" fully engage into 1st gear.

A “very helpful” rating for this answer? Thanks!

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