A forum for owners of Yamaha TTR250 trail and enduro bikes!

MarkShelley · Veteran Member

Seized speedo drive (blue bike of course)

TTRfan · Super Guru

I will be ore than interested to see how you get on Mark. I have half a dozen seized speedo units and didn't have much success with the soaking method. I don't think heat can be used coz of the large seal around the unit.

I ran out of ideas and parked them up. I am hoping a fresh mind on the subject might come up with a solution so the very best of luck wink

Brian

MarkShelley · Veteran Member

TTRfan wrote:
I will be ore than interested to see how you get on Mark. I have half a dozen seized speedo units and didn't have much success with the soaking method. I don't think heat can be used coz of the large seal around the unit.
I ran out of ideas and parked them up. I am hoping a fresh mind on the subject might come up with a solution so the very best of luck
Brian

I know what you mean. Sods law means that the seal on my old unit which has freed up is knackered but the the seal on the seized unit I have been given is good. The seal appears to be pretty much impossible to remove, so I can`t swap seals. I will experiment with a few old techniques and see what transpires.

MarkShelley · Veteran Member

Got it sussed Brian!!

As mentioned. I left it upside down, full of Plus Gas overnight. You can insert an allen key into the cable hole to wiggle the small cylindrical gear to make sure that isn`t wedging the main gear. You can just fit a set of adjustable spanners into it and tighten them across the two flats that the 3-tab washer normally sits around. If you get them tightened up well you can exert a fair bit of torque on it. Eventually it moved very slightly, breaking the corrosion seal I guess, and after a bit of wiggling it got looser and looser. Once it was turning fairly freely I found it was difficult to drag the thing out with the spanner so I just turned it upside down and gave it a few sharp taps onto a block of wood. Good luck with yours!

I will need to get a new 3-tab washer. What obviously happens is the gears seize but the tab washer of course keeps turning, thus wearing its inside round so it no longer has any effect.

Pinman · Member

Was about to give up on my seized speedo drive and sure enough after two nights soaking in plus gas and using a 24mm open spanner with a bar for leverage through the other ring end I finally got some movement across the flats. Was a bit cautious about rounding the flats which would make the whole operation pointless but they seem to be made of strong stuff and can take quite a beating. Awaiting one of Brian's tab washers now to finish the job.