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The TTR250 FAQ web pages -> TTR250 -> Repair and maintenance "stickies" -> Speedo drive rebuild - blue TTRs only
Post Info TOPIC: Speedo drive rebuild - blue TTRs only
TTRfan


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Speedo drive rebuild - blue TTRs only
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The speedo drive on the TTR can easily be stripped out and rebuilt.

The photo below shows the parts involved and I am pretty sure the drive can't be dismantled further. If anyone else knows different please say! 

I have included in the photo a brand new drive for interest.

Fit the parts in order starting from left to right i.e. plain washer, gear, tab washer, plain washer and, finally, circlip.

The replacement parts that are available are the plain washers and the tab washer. Those are usually enough to fix the drive. If all else fails new drive gears are available here. 

Speedo_drive1.jpg

 

Having stripped out the gear make sure that it is as clean inside as possible and make sure that the worm gear turns easily. Use a small electrical screwdriver or similar and use it as shown in the photo.

The photo sequence below shows the build. Sorry about the grease but I always get in a mess playing with grease and oil disbelief

Speedo_drive2.jpg

Speedo_drive3.jpg

Speedo_drive4.jpg

Speedo_drive5.jpg

Speedo_drive6.jpg

 

Once it's all together make sure that the gear rotates freely in an anti-clockwise direction. I use a screwdriver to spin it on one of the tabs.

Speedo_drive7.jpg

 

Replacement new tab washers in stainless steel available here.

Brian



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ttboof


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i like the look.of the replacment tab washers 

 when mine failed me having short arms and deep pockets laid tge washer on the anvil and peened (flattened ) it along the flat sections filed it to fit again and its still going .a good tempary repair untill one of the flash stainless ones is ordered or untill it fails again 



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TTRfan


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I get quite a few emails about speedo drives failing so it is worth bumping this thread methinks!

Brian



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Ammity


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once the circlip is off should the tabs be easy to pull out or is there more to it?

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TTRfan


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Sorry Ammity but I missed your message disbelief

I am guessing you sorted it out but, basically, once the circlip is off then the rest is free to be removed. Some may need a bit of persuasion.....

Brian



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Carrier


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Quick question, does anyone know if the oil seal in the speedo drive is the same as the one on the other side of the axle?

Mine was pretty shredded up.

I tried to look it up as on the parts list but it doesn't list the seal as a separate part.



-- Edited by Carrier on Saturday 13th of January 2018 04:12:19 AM

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Carrier


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Never mind, I should of done the obvious and take the other oil seal out.

I've done that and no, they're not the same.

So now I've gotta look for a new speedo drive unit or try to source the oil seal somehow haha

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TTRfan


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I was never able to source the big seal on the speedo drive and, as you say, Yamaha doesn't sell them separately that I can find.

If you do find one to fit please let us know wink

Brian



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