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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> replacing chain and sprockets
Post Info TOPIC: replacing chain and sprockets
Ammity


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replacing chain and sprockets
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Hey guys, I've never changed this stuff and it's long overdue. 
What size is the nut that holds the front sprocket on? I need to buy a socket that'll fit
should i use loctite on the nut or just the screws holding the back sprocket on?

Any info would be much appreciated



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devon_rich


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The front has a tab washer which locates on the splines and folds up the side of the nut. So make sure you order a new one. Can't remember the nut size.

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petenz


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30mm socket fits it....


..

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TTRfan


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I had a quick look in the repair and maintenance stickies to see if we had a "how to" for fitting new chain and sprockets but we don't seem to. Found these two items which may be helpful though biggrin

Copied from my resto thread here.

 

I also had to replace the front sprocket so I took a leaf out of Jarrah and Lin's books and tried a variation of their chain trick to hold the sprocket whilst taking off and replacing the 30mm sprocket nut.

I wrapped an old chain around the sprocket and clamped it together with Mole (Vice) grips. I used a bit of wood to protect the engine stand and engine case.

It worked a treat so thank you guys!!!!

 

Project engine 4.jpg

Project engine 5.jpg

 

If your chain needs shortening see http://ttr250.activeboard.com/t55468334/fitting-a-new-chain-which-needs-shortening/

Brian

 

 

 

 

 

 

 



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Ammity


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good info!

Whats the torque spec on the nut?

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TTRfan


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110Nm or 80 ft lbs

Worth investing in a manual if you haven't got one - see Klicky Linky 

Brian



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Ammity


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How in the hell do I get the front sprocket nut off. Tried everything. Even my big gorilla mate couldn't get it off with me on the rear brake and the back wheel chocked with wood. What do I need to do? Rattle gun maybe?



-- Edited by Ammity on Friday 17th of February 2017 10:03:56 AM

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TTRfan


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If you have knocked the tab back fully then an extension bar usually does it for me. Else a rattle gun is perfect wink



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