down on power....
Discussion
ive got a lil yamaha sr125 (1992) for commuting. bought it in nov and been doing little jobs here and there to keep it on the road.
there's 1 issue that i cant seem to figure out... i think the clutch isnt fully releasing and therefore slipping.
it has, on occasion, when ive messed with the clutch cable (lever end) sorted it and then hit 65 with better acceleration. however when ive gone back to the back its the same again.
the clutch cable where it connects to the arm (engine side) wasnt connected correctly. the cable sheath has a threaded part with 2 nuts that fit over each side of a clamp (thingy) to hold it in place. (you can kinda see the clamp bit towards the far middle of the engine on the below pic - i apologise for the s
tty pics im in work atm and they will only let you on certain sites).
http://i.ebayimg.com/00/s/MTIwMFgxNjAw/z/FfoAAOSwP...
well the nuts were on one side of the clamp (right hand side furthest away from arm) effectively lenthening the cable. so i assumed it was the wrong cable and bought another.
i put the new cable on and clamped it correctly (followed the haynes manual - lined the arm up with a noth on the engine case). started the bike and put it in gear it jumped forward and cut out. so as if i didnt have the clutch lever in. so had to clamp it exactly the same as it already was.
but its still the same issue. other symptoms:
- anything above 3rd gear is useless (there isnt a rev counter but i think its because the revs are to low)
- i can actually sometimes feel it slipping... where you will accelerate, nothing happens then after a few seconds it starts accelerating.
Im stumped. cant think what to do. maybe, if possible, move the arm (thingy) round or replace the spring on it (see pic)
https://www.motorcyclespareparts.eu/App_Themes/VDM...
Any help is appreciated and apologies if its waffly im trying to explain it and work at the same time and i cant multi task.
Cheers
Pete
there's 1 issue that i cant seem to figure out... i think the clutch isnt fully releasing and therefore slipping.
it has, on occasion, when ive messed with the clutch cable (lever end) sorted it and then hit 65 with better acceleration. however when ive gone back to the back its the same again.
the clutch cable where it connects to the arm (engine side) wasnt connected correctly. the cable sheath has a threaded part with 2 nuts that fit over each side of a clamp (thingy) to hold it in place. (you can kinda see the clamp bit towards the far middle of the engine on the below pic - i apologise for the s
tty pics im in work atm and they will only let you on certain sites).http://i.ebayimg.com/00/s/MTIwMFgxNjAw/z/FfoAAOSwP...
well the nuts were on one side of the clamp (right hand side furthest away from arm) effectively lenthening the cable. so i assumed it was the wrong cable and bought another.
i put the new cable on and clamped it correctly (followed the haynes manual - lined the arm up with a noth on the engine case). started the bike and put it in gear it jumped forward and cut out. so as if i didnt have the clutch lever in. so had to clamp it exactly the same as it already was.
but its still the same issue. other symptoms:
- anything above 3rd gear is useless (there isnt a rev counter but i think its because the revs are to low)
- i can actually sometimes feel it slipping... where you will accelerate, nothing happens then after a few seconds it starts accelerating.
Im stumped. cant think what to do. maybe, if possible, move the arm (thingy) round or replace the spring on it (see pic)
https://www.motorcyclespareparts.eu/App_Themes/VDM...
Any help is appreciated and apologies if its waffly im trying to explain it and work at the same time and i cant multi task.
Cheers
Pete
Prof Prolapse said:
If you are certain the cable length, adjustment, levers are all correct, there's only really the clutch left. It sounds like that's the cause to me.
You can actually measure the thickness of each friction plate if you lack faith in your diagnosis with a Vernier caliper. But given they cost a balloon and a ha'penny to replace and its a consumable, I'd just crack on with changing them. Also check the springs are in tolerance, and re-use the steel plates if they're not warped.
It's a piece of piss job.
maybe for you but as you can tell from my diagnosis im not very mechanically inclined. but cheers lads i'll have a read up about replacing the plates and springs and see where i go from there.You can actually measure the thickness of each friction plate if you lack faith in your diagnosis with a Vernier caliper. But given they cost a balloon and a ha'penny to replace and its a consumable, I'd just crack on with changing them. Also check the springs are in tolerance, and re-use the steel plates if they're not warped.
It's a piece of piss job.
)? it felt to me like i managed to get the revs up to a certain point before i changed gear and then it picked up more speed.Gassing Station | Biker Banter | Top of Page | What's New | My Stuff