G Digger Posted February 16, 2022 Share Posted February 16, 2022 Hi everyone I am trying to connect the rear brake light switch and the linkage from the brake light switch to the rear brake pedal has got me scratching my head a little. it is the linkage from the spring that returns the brake light switch plunger to normal after the rear brake has been released, there is a fixing that fits on the rear of the pedal with a connecting rod on it to connect the spring, no matter which way i position it the movement is the wrong way. it has been a year or more since i dismantled it and i am not sure this is even the right bit as I cant find the linkage on cmsnl. a photo of someones linkage would be appreciated. or a photo of where the springs attaches to. I hope this makes sense cheers Graham Link to comment Share on other sites More sharing options...
NE0 Posted February 17, 2022 Share Posted February 17, 2022 hi Graham Not sure if this helps but this is my 1978 DT175MX rear brake light set up. and the other end of the spring goes on the top part of the brake pedal the switch part points down towards the pedal, and is held on by the plastic nut. It fits in a welded ring on the frame. The long spring attaches to the 'pull out' plunger and the other end attaches to a hole in the top of the brake pedal. When you depress the rear brake , it pulls the plunger out and this makes the internal switch close and the rear light goes on. I appreciate yours may be different but it may be helpful. NE0 1 Link to comment Share on other sites More sharing options...
G Digger Posted February 17, 2022 Author Share Posted February 17, 2022 Hi NEO Thanks for your reply, yeah mine is different. The brake switch is the back side of frame and the pedal has no hole for spring to attach. I have attached some photos but no matter which way I position the linkage it doesn’t work. It actually pushes the spring in when you push the brake on. where I have put the red arrow. I wonder if that bracket will help in some way? further investigation is needed. thanks again NEO 1 Link to comment Share on other sites More sharing options...
NE0 Posted February 17, 2022 Share Posted February 17, 2022 (edited) just looked on ebay https://www.ebay.co.uk/itm/284624724360?var=0&mkevt=1&mkcid=1&mkrid=710-53481-19255-0&campid=5338268676&toolid=10044&customid=EAIaIQobChMIk9DGgdmH9gIVj77tCh376gD1EAQYAyABEgJvyvD_BwE this one comes with a spring? and others also.... https://www.rexs-speedshop.com/product/yamaha-rear-brake-switch-with-spring/ and this one with a rod for a single shock DT250MX https://www.ebay.co.uk/itm/154575520731?hash=item23fd6b43db:g:LMgAAOSwF7BhHi47 Edited February 17, 2022 by NE0 Link to comment Share on other sites More sharing options...
G Digger Posted February 17, 2022 Author Share Posted February 17, 2022 Thanks Neo I think I will get a new one but still don’t know how the linkage works. Might have to improvise a little to attach spring to brake pedal. I have posted on Facebook forum for someone to post any more photos, hopefully someone will send photos without too much abuse thanks again for your help cheers Graham Link to comment Share on other sites More sharing options...
NE0 Posted February 17, 2022 Share Posted February 17, 2022 Heh Graham, Done some further searching and found this image of a DT250MX rear brake switch and looks like you might be missing a bit! Link to comment Share on other sites More sharing options...
G Digger Posted February 17, 2022 Author Share Posted February 17, 2022 Is that not the spring? Link to comment Share on other sites More sharing options...
NE0 Posted February 17, 2022 Share Posted February 17, 2022 (edited) and this photo shows the little tag poking up just behind the brake pedal https://www.thebikespecialists.com/vehicle/yamaha-dt250-mx-classic-iconic-trail-bike-excellent-condition-in-sheffield-43b7fe63-9b9e-4049-9742-c35103cd06e9 one of the photos shows a close up of the brake side....you can just about make it out. This gives an indication that the tag has to be uppermost. Yes, there looks like a small spring attached to that arm, do you have that? Edited February 17, 2022 by NE0 Link to comment Share on other sites More sharing options...
G Digger Posted February 17, 2022 Author Share Posted February 17, 2022 Nice one, you’ve got keen eyesight, I will have another try in morning. at least I now know I’ve got the right linkage. when I dismantled this bike I was too cocky thinking it would be easy to suss everything out but I was wrong. cheers Graham As for the spring I’ve got a collection of them but will look for the original in my drawer Link to comment Share on other sites More sharing options...
NE0 Posted February 17, 2022 Share Posted February 17, 2022 I learnt along time ago to take loads of digital photos with my camera, saves a lot of hassle a year later!! Link to comment Share on other sites More sharing options...
G Digger Posted February 17, 2022 Author Share Posted February 17, 2022 Lesson learnt, this is my second refurb And I think I got a bit cocky as my first was a Honda and honda seem to have twice as many parts to them as other bikes. hopefully will sort it in morning. Will let you know cheers 1 Link to comment Share on other sites More sharing options...
G Digger Posted February 18, 2022 Author Share Posted February 18, 2022 Hi Neo all sorted now had to adjust spring length but all working good now. Cheers Graham 2 1 Link to comment Share on other sites More sharing options...
NE0 Posted February 18, 2022 Share Posted February 18, 2022 (edited) Excellent Grah, Glad you got it sorted out. just got you a Gold medal on the leader board! Edited February 18, 2022 by NE0 Link to comment Share on other sites More sharing options...
G Digger Posted February 18, 2022 Author Share Posted February 18, 2022 Link to comment Share on other sites More sharing options...
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