919 front sprocket install - Wrist Twisters
 
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post #1 of 7 Old 07-30-2009, 09:19 AM Thread Starter
Steve
 
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919 front sprocket install

Zookmor did this write-up for me when I bought his 15t front sprocket.
Wanted to post it up for the next guy....

I would consider myself a moderately mechanical amateur at best. I have removed both wheels and tank the chain, done front and rear brake pads and SS lines. It honestly is not a very difficult process once you do it once. However you will need a rear stand or means of raising the swing arm, and a torque wrench.

Start with removing the sprocket cover and finding the socket size that will fit the sprocket nut(14mm i think) Then if you have someone that can help have them sit on the bike and hold both brakes while the bike is in first gear and standing upright. Then use either a breaker bar or put some strength behind a socket tool to remove the nut (lefty lousy).

The next part will be to raise the rear of the bike with a swing arm stand or car jack or whatever you have to get the tire off the ground that you are comfortable with.

Now you will remove the rear brake caliper in order to avoid damage to the rotor. Then you will need to remove the rear wheel. Loosen up the rear axle nut.(right side- the left side is the axle rod) Now turn the chain adjusters in so you will have some play in the chain.

The next part is to slide the axle out of the rear tire. It helps to hold the tire up with your feet or an assistant so the axle can slide straight out and not be coming out at an angle. Once the axle is out slowly lower the tire to the ground and move it forward towards till it is against the back of the swing arm.

At this point the chain should have significant slack, and if you have the time you should take the chain off of the rear sprocket and clean the chain. If not you can leave it around the rear sprocket and turn the slack towards the front so you can remove the front sprocket.

Once you have slack up by the front sprocket it will not be difficult to just slide the sprocket off of its counter shaft.

Installing is basically the same steps, but in reverse. Remember that when you install the sprocket you will have to tighten the chain up, because it is smaller than stock. Also I suggest taking the time to clean and lube the chain while you are taking the time to work on everything.

Remember it is much easier to take the sprocket off in 1st gear as well as holding the brakes, because if you don't you might end up slipping the trasnmission like I did my first time when I wasn't holding the brakes. It took me about an hour or hour and a half the first time, and I was just winging it. I have done it 3 or 4 times now, and it only takes about 15 or 20 minutes including the chain tightening.

If you have any more questions or think I missed anything let me know.

Zack

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post #2 of 7 Old 07-30-2009, 06:09 PM
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appreciate it steve. I had already deleted the message.

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post #3 of 7 Old 07-30-2009, 09:11 PM
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dude... changing the front sprocket on a 919 is a 15 minute deal...

just loosen the rear axle... adjust it all the way forward...

take a 8mm and remove the front sprocket cover... take a 14mm get someone to stand on the rear brake lever... remove sprocket... put new one.... tighten... put cover back on...tighten... adjust chain... tighten rear axle....

play with the new unicycle....

15mins...not counting hand washing time...



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post #4 of 7 Old 07-30-2009, 09:22 PM
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so that front sprocket takes torque to loosen. I tried replacing my front sprocket recently, but couldn't loosen it and was afraid to torque it too much. I'll try again and won't be afraid to let loose on it a bit this time.

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post #5 of 7 Old 07-31-2009, 06:02 AM
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Quote:
Originally Posted by barton664 View Post
dude... changing the front sprocket on a 919 is a 15 minute deal...

just loosen the rear axle... adjust it all the way forward...

take a 8mm and remove the front sprocket cover... take a 14mm get someone to stand on the rear brake lever... remove sprocket... put new one.... tighten... put cover back on...tighten... adjust chain... tighten rear axle....

play with the new unicycle....

15mins...not counting hand washing time...
+1 No need to waste your time with a stand or a jack and all that time messing with the rear wheel.

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post #6 of 7 Old 07-31-2009, 07:44 AM
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Quote:
Originally Posted by lmtdgov View Post
so that front sprocket takes torque to loosen. I tried replacing my front sprocket recently, but couldn't loosen it and was afraid to torque it too much. I'll try again and won't be afraid to let loose on it a bit this time.
make sure you use a HIGH QUALITY 6 POINT SOCKET........

DO NOT USE A 12 POINT SOCKET OR YOU WILL STRIP THE HEAD OF THE BOLT

and when you put it back on you don't have to crank on it... just make it tight.... no need for 100ft lbs of torque... just snug +1/4 will do the trick...

and then next time you aint gotta pop a hernia loosening the damn thing..



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post #7 of 7 Old 07-31-2009, 06:17 PM
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Quote:
Originally Posted by barton664 View Post
make sure you use a HIGH QUALITY 6 POINT SOCKET........

DO NOT USE A 12 POINT SOCKET OR YOU WILL STRIP THE HEAD OF THE BOLT

and when you put it back on you don't have to crank on it... just make it tight.... no need for 100ft lbs of torque... just snug +1/4 will do the trick...

and then next time you aint gotta pop a hernia loosening the damn thing..
Thanks for the tip. I do have some 6 points and will use that. Also I have a 3 foot long bar for the breaker. Should be a snap now that I know I won't be ripping apart the gears on the inside by cranking on it the wrong way.

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