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Banshee not shifting down?


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A few weeks ago I had an issue where my Banshee would drive in neutral but wouldn't shift out of it (very weird I know). I ended up remedying that issue by splitting the cases and checking what was up with the tranny and found that on the final drive gear there were two teeth broken off. I put in a set of new gears, put her back together and it was good to go! Drove it a few days everything was fine and out on a drive my friend got on it to check it out and on the way back over it no longer shifted below fourth. I believe it's fourth anyway, hard to tell because it won't shift down. It seems to shift up once or twice and back down but that's what leads me to believe it's in fourth. 

 

I'm wondering what it could be that would stop it from down shifting into fourth. It runs fine still, and drives in fourth and such but obviously I'd like to fix it so I'm able to shift correctly and not burn out the clutch by starting in fourth all of the time.

 

Any ideas?

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I mean, the only issue in the transmission the first time was the final drive, I replaced both gear sets. When this happened, I had just bought the bike, so I might have had it three or four days before the tranny began acting up in which case it got torn down and found what was wrong in order to be fixed/replaced. After it was put back together it ran great with 0 issues. Took it on 2-3 long rides and it randomly stopped shifting lower than fourth. I'm not the one who fixed it, my buddy is a yamaha tech and he did the tear down and such. I don't see how it wasn't done correctly being that it drove great after that? 

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I mean, the only issue in the transmission the first time was the final drive, I replaced both gear sets. When this happened, I had just bought the bike, so I might have had it three or four days before the tranny began acting up in which case it got torn down and found what was wrong in order to be fixed/replaced. After it was put back together it ran great with 0 issues. Took it on 2-3 long rides and it randomly stopped shifting lower than fourth. I'm not the one who fixed it, my buddy is a yamaha tech and he did the tear down and such. I don't see how it wasn't done correctly being that it drove great after that?

You said the gears were broken.

Why? What caused them to break?

You put good parts in. Possibly took 3-4 rides to wear again and break.

Replacing broken parts isn't fixing the issue. Knowing why these parts broke and replacing the corresponding parts that may be involved and correcting the issue is fixing it.

Maybe they did just break apart. Maybe this issue is totally unrelated. But is a pretty big coincidence that you have 2 trans issues like this.

 

Do you have pics of the last trans? You day the final drive. Do you mean 6th gear? The trans is a constant mesh. So everything is always in contact. Your just moving the drive and driven gears around.

A pic might help someone point you in the right direction to look.

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I'll get a pic of the old transmission uploaded, but the problem last time I believe is unrelated because the symptoms are different. Two teeth on the gear setting broke off and it wouldn't go into neutral, in fact it would drive in what was supposed to be neutral and wouldn't go up or down. Now it was good and got stuck into fourth I want to say, but it still shifts up to fifth and sixth, but not below fourth. 

 

The old trans gear set is attached xH0GuHm.jpg

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Also, my guess on what made the gear break previously is low gear oil.. When I bought the quad everything seemed fine, but after the issue occurred I tore it down and found a small crack that leaked oil and my assumption is the oil leaked out and I lost the lubrication I needed which caused em to get too hot and broke off or something. I don't know too much about quads.

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