What did you do to your bike today?
- Thread starter edd1e
- Start date
MOT is Saturday, but having just dusted off the bike from the winter lay over the front forks are ******* oil over the fork legs and brakes. An MOT failure 
Now I have to see if I can get someone to replace the seals pronto, or change the MOT appointment back a week or two
Now I have to see if I can get someone to replace the seals pronto, or change the MOT appointment back a week or two
Lift the dust seals, pack it with kitchen roll replace the dust seals and sort it after the mot.MOT is Saturday, but having just dusted off the bike from the winter lay over the front forks are ******* oil over the fork legs and brakes. An MOT failure
Now I have to see if I can get someone to replace the seals pronto, or change the MOT appointment back a week or two
Wondering if anybody knows what this might be..
Pulling away at the lights, second or third gear, I can replicate this by giving it some throttle, and where I expect torque, I get a weird stuttering.
I've put together a clip of three examples in ascending severity. The last (third) example in this clip demonstrates it the most. https://streamable.com/nbxw3
Most of the Googling I've done has said it's down to a hose of some description dragging air into the engine where it shouldn't. Any ideas?
Pulling away at the lights, second or third gear, I can replicate this by giving it some throttle, and where I expect torque, I get a weird stuttering.
I've put together a clip of three examples in ascending severity. The last (third) example in this clip demonstrates it the most. https://streamable.com/nbxw3
Most of the Googling I've done has said it's down to a hose of some description dragging air into the engine where it shouldn't. Any ideas?
Haha!
Whats the bike? Carbed or injection? only does it on acceleration? fine steady throttle etc?
Could just be me but I cant really get much from the video, wind noise is too high, can you mount the camera behind the screen just for the purpose of a test? almost sounds like its clutch drag.
Whats the bike? Carbed or injection? only does it on acceleration? fine steady throttle etc?
Could just be me but I cant really get much from the video, wind noise is too high, can you mount the camera behind the screen just for the purpose of a test? almost sounds like its clutch drag.
Pull away in a lower gear and cant hear a thing.. just wind noise
Right, I have to explain myself furtherStop pulling away in 3rd?
The bike is carbed. Sorry, I forgot to point that out, and it's a Suzuki RF900R
I'm not pulling away in first, second and third. I'm pulling away in first. The video I uploaded shows three instances of me pulling away in third, with varying amounts of throttle added - the third example in the clip involves me giving it a fair bit more throttle, which causes that stuttering sound that you can hear.
I can replicate the problem by, for example, doing around 3k revs in third gear, and then increasing throttle looking for more torque. The bike struggles to pull, and you get that stuttering noise. If I continued to give it throttle, I think the bike would stall. The more throttle I add, the more pronounced it is. I can also replicate this under the same conditions in second gear.
Finally, I'm getting around the issue at the moment by revving the bike higher. When it starts to stutter (it sometimes happens at times when I'm overtaking slow traffic and I need to get away quickly), I have to change down a gear, and the extra revs will get the bike to pull fine.
If I'm hitting a slip road of a motorway, once I'm above 4k revs in whatever gear, the bike pulls fine.
@Fireskull - I know it's annoying, but the roundabout's traffic light controlled, and that particular entrance to the roundabout doesn't have any lights, so people have an extremely small window of opportunity to pull out on to the roundabout, so you just expect they're going to do it
Thanks for your advice so far guys, I'm looking into clutch drag at the moment, not heard of that before.
I have an external mic for the camera, so I'll plug that in and see if that helps.
That's what I'm sort of angling towards, it does sound like the carbs might need cleaning. It's been getting worse since Feb, and is bad enough now that it needs addressing.
Also noticed that lately, it idles slightly higher than it used to. The choke cable doesn't appear to be sticking, so I'm wondering if it's running slightly rich, which may also indicate not enough air getting to the carbs?
There is very little vacuum generated at full throttle though. If the butterfly valve is fully open there is not enough restriction to create a vacuum in the throat of the carb / throttle body.
You can test this in a car (petrol) with vacuum servo brakes. try pumping the brake while at full throttle. The brake servo will run out of vacuum.
(At your own risk).
Not sure how much this helps though.
You can test this in a car (petrol) with vacuum servo brakes. try pumping the brake while at full throttle. The brake servo will run out of vacuum.
(At your own risk).
Not sure how much this helps though.
