What is the wrench size i need to tighten handle bars on a jeep FT 4,0 boys bike

On the steering stem were the handle bars go through there will be a clamp. This clamp will have one, two or four bolts tht clamp the handle bar.
Depending on the type of bolt used on your bike you will need a ring, socket or allen wrench. Loosen these bolts of about two turns anti clockwise and center your bars and then tighten the bolts.

If it is an older bike, you loosen the bolt at the top of the handle bar shaft until it is about 1/2 inch raised. Take a hammer and give it a swift bump and it should drop into the shaft. Hold the front tire between your legs and the handle bar should raise up. Re tighten once every thing is lined up. If the bike has front hand breakes these may need to be adjusted.

They tighten with several different size or types of bolts. Easiest is headbolt with 1/2 inch wrench. Some use hex or allen wrench bolts, usually 4. These may be 5 or 7 mm. If these aren't on your bike, try sheltonbrown.com for assistance or take it to local bike shop

just under the part the handlebars go through (the gooseneck)
there is a bolt that takes a 6 mm allen wrench, tighten the bolt, If it still doesn't tighten it might be stripped (there are ridges on the bars and the gooseneck).... Some bikes have 2 shims that fit around the bars, not sure if yours did or not, they could have fallen out when it loosened up if so you need to replace them good luck

1995 Toyota T100 4WD Pickup
Manual Locking Hub - Removal and Installation
REMOVAL & INSTALLATIONSee Figures 1 through 11

Fig. 1: Exploded view of the free wheeling hub

Fig. 2: Turn the handle with your hand to the free position

Fig. 3: Note the directions in which you can turn the handle: left-free, right-lock

1. Remove the hub cover. Set the control handle to the "FREE" position.

Fig. 4: With the handle in the free position, remove the six hub cover bolts

1. Remove the cover mounting bolts, then pull off the cover. Remove and discard the gasket.

Fig. 5: Pull the cover off

1. Remove the bolt with washer.

Fig. 6: Using the correct size wrench, loosen ...

Fig. 7: ... then remove the center bolt and washer

1. Remove the mounting nuts and washers.

Fig. 8: Next, remove the outside mounting nuts and washers

1. Using a brass bar and hammer, tap on the bolt ends, then remove the cone washers.

Fig. 9: Using a brass bar and hammer, tap on the bolt ends ...

Fig. 10: ... then remove the cone washers

1. Pull off the hub body.

Fig. 11: The free wheeling body should come off easily; be sure to discard the old gaskets

1. Remove and discard the gasket.

To install:

1. Place a new gasket into position on the front axle hub. Install the free wheeling hub body with the cones washers and nuts. Tighten the nuts to 23 ft. lbs. (31 Nm).
2. Install the bolt with washer, tighten to 13 ft. lbs. (18 Nm).
3. Apply multi-purpose grease to the inner hub splines.
4. Set the control handle and clutch to the free position.
5. Place a new gasket into position on the cover.
6. Install the cover to the body with the follower pawl tabs aligned with the non toothed portions of the body.
7. Tighten the cover mounting bolts to 7 ft. lbs. (10 Nm).

Fig 1.Exploded view of the Free Wheeling Hub




Fig. 2 Turn the handle by hand to the "FREE" position




Fig. 3: Note the directions in which you can turn the handle: left-free, right-lock.




Fig. 4 With the handle in the free position, remove the six hub cover bolts.




Fig. 5 Pull the cover off.




Fig. 6 Using the correct size wrench, loosen ...




Fig. 7 ...then remove the center bolt and washer




Fig. 8 Next, remove the outside mounting nuts and washers.




Fig. 9 Using a brass bar and hammer, tap on the bolt ends.




Fig. 10 ... then remove the cone washers




Fig. 11 The free wheeling body should come off easily; be sure to discard the old gaskets.

There should be a bolt with an allen key head on it which is used to tighten the brake handle assembly to the handle bar.

See the picture at the following link:

http://www.google.ca/imgres?imgurl=http://www.bikebrakelevers.com/images/bike-brake-levers-2.jpg&imgrefurl=http://www.bikebrakelevers.com/&usg=__WHyTO7aZJInfm2SzHsuCb2P9CpU=&h=300&w=300&sz=7&hl=en&start=0&zoom=1&tbnid=fww49ch-vYQzAM:&tbnh=141&tbnw=193&ei=SoWoTaXGFqWU0QHnzd35CA&prev=/images%3Fq%3Dbike%2Bbrake%2Bhandle%26um%3D1%26hl%3Den%26sa%3DN%26biw%3D1001%26bih%3D589%26tbm%3Disch0%2C177&um=1&itbs=1&iact=hc&vpx=332&vpy=204&dur=1016&hovh=225&hovw=225&tx=109&ty=124&oei=SoWoTaXGFqWU0QHnzd35CA&page=1&ndsp=13&ved=1t:429,r:10,s:0&biw=1001&bih=589

Just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the picture at the website indicated.

The bolt you need to tighten is the uppermost one in the pic.

Just use the correct size allen key wrench to tighten in up once you put it in a position for your hand to comfortably operate the brake.

Good luck.

Removal & Installation

Exploded view of the free wheeling hub
Click to Enlarge

Turn the handle with your hand to the free position

Note the directions in which you can turn the handle: left-free, right-lock

1. Remove the hub cover. Set the control handle to free.
   

With the handle in the free position, remove the six hub cover bolts

1. Remove the cover mounting bolts, then pull off the cover. Remove and discard the gasket.
   

Pull the cover off

1. Remove the bolt with washer.
   

Using the correct size wrench, loosen ...

... then remove the center bolt and washer

1. Remove the mounting nuts and washers.
   

Next, remove the outside mounting nuts and washers

1. Using a brass bar and hammer, tap on the bolt ends, then remove the cone washers.
   

Using a brass bar and hammer, tap on the bolt ends ...

... then remove the cone washers

1. Pull off the hub body.
   

The free wheeling body should come off easily; be sure to discard the old gaskets

1. Remove and discard the gasket.
   

To install:

1. Place a new gasket into position on the front axle hub. Install the free wheeling hub body with the cones washers and nuts. Tighten the nuts to 23 ft. lbs. (31 Nm).
   
2. Install the bolt with washer, tighten to 13 ft. lbs. (18 Nm).
   
3. Apply multi-purpose grease to the inner hub splines.
   
4. Set the control handle and clutch to the free position.
   
5. Place a new gasket into position on the cover.
   
6. Install the cover to the body with the follower pawl tabs aligned with the non toothed portions of the body.
   
7. Tighten the cover mounting bolts to 7 ft. lbs. (10 Nm).
8. i hope this is what you are looking for
   
9. plz vote comment and reply if need more help
   

at the base of the middle bar there should be a thin bolt that you tighten with a 2 inch pipe wrench and holding onto the bars and tire with your knees so bars stay straight.

Yes. Exchange it for either a built bike or another one and try again.

It should be a fairly simple clamp that goes around the bars with a bolt and nut to secure it and tighten it down, if these don't work then the bike is useless and unrideable

If the handlebars are "slipping" then you need to tighten the bolts on the stem. The stem is the piece that connects the handlebar to the bike itself and usually has 1, 2 or 4 hex headed bolts that hold the handlebar in place. The Park Tool website indicates that you should torque these bolts to 15-20 foot lbs. This is important because the potential for injury is high if the bars slip at the wrong time. If you don't have a torque wrench then take the bike to your local bike shop and let a professional with the proper tool do the work. This is so simple and quick a fix that they may not even charge you