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

Yes, lighter springs combined with lots of trials type riding would surely lead to a slipping clutch in no time. The cable is good, I regularly clean and oil them, I try to keep the clutch lever lubricated and the spring clean and lubed at the arm end. I was thinking about possibly constructing an adjustable length actuating arm. So if I made it and it was too light, i.e. not enough feel, I could move it back a hole or something. But not really sure how to start designing that yet and how to stop it being floppy and making everything worse.

Looks like we are agreed Adam! You need to modify the actuating arm.

It's welded to the shaft so might be difficult to work on in situ.

Looks like you will need to remove the clutch cover to release the rod inside the clutch that presses against the actuating arm shaft being careful not to lose the ball bearing!

It is then a case of disconnecting the cable and removing the locating screw before you can pull the arm out.

Not sure if you can get the shaft up far enough to remove it with the engine in situ.

If you need a spare arm to experiment on then I am sure I have one here.

Over to you 

Brian

Another thing you can try for minimal cost is lube your clutch cable with silicon spray. Use a cable oiler and blow all the old lubricant out thoroughly the first time. It always seems to work smoother for me. The only downside is that to keep it that way you have to lube it more often.

Right, cleaned the cable out with brake cleaner, pinch it from work so it's fine, allowed to dry, relubed with fresh oil, just 3 in one again, fitted the clutch thing that turned up this morning. The only issue I had was that the extra long clutch cable fitted to accommodate the higher bars and bar risers is too long with that extra bit thrown in, so I rerouted the cable from going up the inside of the speedo to round the outside of the speedo but still behind the headlight shroud. An original length clutch cable would work better, but I couldn't find my original.

I then took it for a quick test spin after adjusting the freeplay at the lever, pulled away and the clutch started slipping once I got onto the main road. I nursed it home without revving it too hard and had a think. I came to the conclusion that now that there are two cables each one needs to be adjusted individually of the other. I still haven't got it quite right but I was in a rush to hand in a form to allow me to compete in a trial so couldn't be bothered to keep messing about with it. The deadline was today and I just got my confirmation that I joined the club today a well, giving me my number, so I went a and got lost in Solihull for a few hours but next Sunday, I'll have a better evaluation of what's going on then.

But for now, even on the hardest setting it is much easier to pull, which is unusual, because I didn't notice a difference at all just testing it without riding.