Question about Mongoose 16" Boy's Kids Showtime Bicycle Bike

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I can't get the handlebars to lock in to the forks, any ideas?

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You haven't given me much to go on, but a common problem is to mis-identify where to tighten. There is a large nut (about 1-1/4 inch) that is the locking nut for the headset (which is where the bearings are that allow the fork to turn and steer the bike). This large nut does not tighten the handlebars. Rather, there is a long bolt that travels straight down through the handlebar stem. The handlebar stem is the bar that clamps to the middle of the handlebars and extends vertically down into the headset. At the bottom of the bolt (where you cannot see it) there is a wedge shaped nut. When you tighten this bolt the wedge nut jams itself inside the tube which is the top of the forks inside the headset, thereby locking the handlebar stem to the the forks. The head of the bolt you need to tighten can have a variety of shapes - could be an ordinary hex head, or it may require an Allen wrench (hex key). There are lots of different styles, but if you Google images of "handlebar stem" you will get the idea. good luck. Al K

Posted on Oct 15, 2010

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1.Loosen upper triple tree clamp pinch bolts. Remove upper triple clamp and handlebars.

2.Loosen fork stem bolt and let fork stem drop down approx. 5 inches.

Note: On the left side of the steering stem there is a "half moon" indentation that has been machined into the steering stem for the lock. Let steering stem drop until this indentation is in full view.

3. Use a scribe and remove lead plug. (there is a flat looking place below the key lock. The lead plug is underneath this and it hides a set screw. Dig the lead plug out to get to the set screw)

4.Unscrew the set screw

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INSTALLATION

General
There is an internal boss in the left side of the steering head opposite the external boss. The end of the lock fits into this internal boss.

There is a hole in the bottom of the lock into which the set screw fits. This hole must be at the bottom when the lock is installed.

When the lock is correctly installed, a forward-facing flat on the lock will fit against a flat inside the external lock boss and the face of the lock will be flush with the face of the external boss.

1.Steering stem should be in above position. See steps 1 and 2 above.

2.Grease the end of the lock (the part that goes into the internal boss) and slide lock into external boss.

Note: Steering stem must be in locked fork position.

3. Move steering stem into locked fork postition. Rotate steering stem sligtly, while fully installing lock.

4.use Loctite 242 (medium strength blue) and install set screw

5.Use key in the lock and tighen set scrw until lock begins to bind; then back set screw out 1/2 turn.

6.Pound in lead plug (or use a good quality sealant)

7. Install fork stem, upper triple clamp and handlebars.

Right out of the book. Hope it helps. Good Luck.

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