donhuzayfa Posted July 30, 2011 Posted July 30, 2011 Hi guys, in first gear my bike shudders just when the clutch kicks in, and I think the chain jitters too, the awkward thing is that ive adjusted the chain, which is practically new, and full of lube, and I've also realised that the top part of the chain hits the top of the swing arm, I was thinking I need to adjust the clutch cable, but when I do, it realistically doesn't make a difference?? Quote
eastanglianbiker Posted July 30, 2011 Posted July 30, 2011 doesnt sound like you have adjusted the chain correctly what bike is it and when you fitted new front sprocket on did it have less teeth than before as that might make sprocket smaller hence chain hitting swinging arm Quote
Guest Posted July 30, 2011 Posted July 30, 2011 pics or better description of 'hitting top part of swingarm' will help..Is the problem constant? Or is it less pronounced with more throttle when you release the clutch? Quote
Tango Posted July 30, 2011 Posted July 30, 2011 Depends what bike it is. Mine and many others have a chain guide on the top of the swinging arm that the chain rubs against. As EAB says...make sure you have the correct sprocket on the front. This is a common problem on my bike and there are recommendations around to change the size of the front and rear sprockets to stop the chain guide wearing out.Did the judering exist before you changed the chain? If not then there is something wrong with the adjustment. Again as EAB says...double check the tension.Bob Quote
donhuzayfa Posted July 30, 2011 Author Posted July 30, 2011 Yes it existed before hence the reason I changed the chain and sprocket, it judders just as the clutch kicks in on the first gear, all other gears are fine. As soon as its kicked in, toward the last bit of release of the clutch it's fine, Quote
mealexme Posted July 30, 2011 Posted July 30, 2011 My YBR does this, I have always just thought it was down to me still being a learner and teaching myself how to change gears etc. What bike do you have? Quote
Fozzie Posted July 30, 2011 Posted July 30, 2011 Sounds like the clutch is doing out too fast, the engine is losing too much speed and wants to stall. If you do this and give too much throttle a 125 will judder like a nutter. Race start the little thing, 8000rpm on a warm engine, smoothly let out the clutch without letting the revs dip below 5000rpm. Does it judder then? Quote
donhuzayfa Posted July 31, 2011 Author Posted July 31, 2011 Lol no it doesn't but it sounds like it's about to explode!!! Why do you have to do it in so many revs though? Quote
Colin the Bear Posted July 31, 2011 Posted July 31, 2011 Options, slip the clutch, lose weight, get bigger bike Quote
Bogof Posted July 31, 2011 Posted July 31, 2011 Kymco kr sport 125 Change the oil, and make sure you use the correct grade. It may not cure it, but new oil is a good thing anyway Quote
Fozzie Posted August 5, 2011 Posted August 5, 2011 Lol no it doesn't but it sounds like it's about to explode!!! Why do you have to do it in so many revs though? Little engine pulling about 200kg with a rider on it. I judders as it would rather stall and is because it's struggling. More throttle on start ups with higher revs will help. Just find the balance where it stops juddering and problem solved.My er650f judders in first with revs below 2000rpm on setting off, but it's a choppy inline twin anyway so it judders anyway. Quote
rennie Posted August 5, 2011 Posted August 5, 2011 when you changed the rear sprocketdid you change the cush drive rubbers too?(rubber things that fit inside rear wheel)that would do it Quote
megawatt Posted August 5, 2011 Posted August 5, 2011 Nice one Ian , was just thinking cush drive rubbers. Quote
keith565 Posted August 5, 2011 Posted August 5, 2011 my marauder juddered in first just like donhuzayfa, i changed chain, sprockets and cush rubber, did the trick. Quote
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