engine vibrates at 50 mph

[phil dulanie]

when the bike reaches 50+,it vibrates and kicks out of 5th gear.any info would be helpful.

[jonathan180iq]

1st question, are you sure you're fulling engaging 5th? You're probably not shifting into 5 until you reach that speed anyway.

How many miles on your oil? We have wet clutches, which means the engine oil is also the trans gear oil. So that needs to be in good shape in order to have a happy and harmonic shifting experience.

If it's actually disengaging the gear randomly, you're going to have a little more work ahead of you...

But start by ensuring that your fully getting 5th to settle in. There is an adjustment on the shifter that you can check. Hopefully that's all it is.

If you have to, get some swing arm stands and lift the rear wheel off the ground. You can test shift all of the gear, just as if you were holding up a bicycle, and see what's going on.

[jonathan180iq]

Oh, and how many miles on your bike? Have you by chance checked the torque on the motor mount nut?

[JohnC]

Check the chain and sprockets for adjustment and wear.

[raul10141964]

check part # 17 & 20 on the picture
thees parts hold the the transmition in gear
part #18 is the plug beside the oil drain

[Water Warrior 2]

Parts 17 to 20 are the internal pieces that hold the gears in place once you shift.
Also wonder if you may have a slightly bent shift fork for 5th gear. Look at parts #1 and #2.
But before you get all excited about bent or broken parts you may want to do a couple other things first. How new is the oil? If you are nearing the due date you would be wise to change the oil as the tranny can get fussy after the oil starts to break down.
Also check the shift linkage to make sure it is free and moving smoothly. A little chain lube in the rubber covers on the ends of the shifter rod will do wonders. Make sure all the lock nuts on the adjustment rod are snug. They are used for raising and lowering the foot shifter and can sometimes come loose. This is a method to make the shifter fits your particular foot when riding. Do the simple stuff first and you will likely avoid making a big mistake by tearing into the internals.
Also do a check on the chain and sprockets as JohnC mentioned. That might lead to a vibration at higher speeds too. Do you know how many miles are on the chain and sprocket? If you have been doing a chain adjustment often lately it is a sign that the parts have reached their end of service.