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Found 12 results

  1. After a fresh replate by millennium technologies (they had access to this new piston for sizing), a new wiseco piston with proper exhaust bridge holes drilled, new wrist pin and bearing, and new power valves, my 2001 rm125 has a rattling sound coming from the engine. This bike is seriously testing me. It hasn’t given back what I’ve put into it in the slightest. Someone please help me diagnose this noise. I have a video of it running in this YouTube link: https://youtube.com/shorts/sBJHr1Bg7iQ?feature=share
  2. I'm back with another post... I thought I could handle this myself but after 3 days of messing with this I am at a loss. When I pull my front brake, I get a rattle noise coming from the front sprocket area. The same happens if I bounce the suspension. My chain was a little loose so I tightened it as tight as I could safely go. It was annoying messing with those spacers on the rear tire by myself but I finally got everything back together (including having to make a new gasket for the cover >.>). I thought that would be the end of it but the noise persists. The front sprocket itself has a little wiggle play to it but the bolts are tight so I assume that is normal. Does anyone have any idea what this is? It is driving me nuts that I can't ride my bike because I'm afraid I'm going to break something yet the thing that appears to be making the noise doesn't seem to want to stop. The front sprocket area was always a little noisey when the bike is off but I figure it is supposed to be that way. I have not had this issue before and it only does it when I brake with the front or bounce the suspension. Not from engine braking or rear brake. I have put 1000 miles on the bike this summer and it hasn't made this noise once... now it does it every time. I am 99% sure this is coming from the sprocket area and not the front brake area. I can feel vibration on the footpeg Please help me. Lol. I got laid off and can't afford to send this bike to a shop.. besides there is no shop here and I'd have to rent a trailer
  3. I rebuilt the top end everything runs fine but when i bit bumps or have a low rpm pull its rattles almost like chain slap . I just replaced the chain and didn't change and if i kill the engine and roll over bumps it still does the same thing. I have also checked that the power valve adjusting spring is good and adjusted right and nothing i am lost at this point. it also has brand new reeds. it sat for 2 years before rebuild.
  4. Hi guys, I have EC 250 2008 racing and I have kind of rattle when idling and sticking idle. I set my mixture screw 1,5 turn out from fully closed and idle screw a lot in. Bike idles really fine no matter if cold or hot, but when I blip the throttle idle sticks higher and remains until I put gear and loose the clutch a bit or plug exhaust with my hand, than idle is back at normal speed. Can it be because air leak? I have sprayed chain lube on carb manifold and no change, so there is no leak, but maybe crankshaft seal?? Although I have rattle on idle that I think is normal for 2T but maybe not. I have very similar rattle on Husqvarna WR 125 which is after engine rebuild. Is it normal or not? Maybe rattle from reeds? https://www.youtube.com/watch?v=AIytJVgRp44
  5. 2012 KTM XC 300 New top end and jetted per the manual. Starts and idles great. Tons of power WOT. Cleaned and indexed the power valve during rebuild. Also checked bottom end was tight. I am fairly certain it made this noise before the new top end as well. When accelerating at somewhere between 1/8 to 1/4 to throttle I hear a rattle / ping that I swear sounds like detonation. It’s a higher pitched noise like marbles and not a low clatter like a piston or rod. If I wick it wide open the thing rips and I don’t hear any rattle. If I stay at lower throttle no rattle either. But right at that 1/4 throttle cruising area I hear the noise. I have also tried richer pilots and richer needles I have searched every YouTube video and every thread on TT and KTM. I’m coming up with nothing that matches up exactly with this. Detonation? Power valve rattle? Has anyone witnessed this? Any advice?
  6. Second ride out on my 2014 kx450f first ride everything smooth, replaced my front sprocket and Chain roller (Rear chain cover is slightly rubbing on chain). On the lower left side i hear an occasional rattle when riding in all gears putting around. When I hit the gas hard and rip through the gears ur tends to go away. Also goes away when bike is stationary as well as just rolling in neutral. Chain and sprockets are new. could it be chain slap? Or worse something with my transmission? If so how would I go about fixing it considering it’s all new parts
  7. Hey everyone. I've just started to ride my dr650 again after about a 6 month break. As I was taking it down a back road I started to hear a rattle coming from the left side of the bike. At first I could only hear it in 1st gear, after I got back to the main road I could hear it in the lower gears. Where there wasn't a whole lot of noise hiding it. It doesn't do it on smooth roads, and it doesn't do it while idling. At first I thought it might be my home made foot pegs. Alas it still did it even as I was holding them still. Also on the left side the engine is getting very hot fairly quickly. I'm currently waiting for the engine to cool off to knock things aroubd and see if i can find something loose. In the meantime I've been looking up the symptoms and some posts mention the heat shield, but since it isn't rev specific I don't think that's it. Any ideas anyone?
  8. 1993 Honda 650L showing 8,000 miles. Please help me identify this noise. The knock is not present at cold start, but develops once warm. Noise audible starting at 1:00, audible at 1:20, fully developed by 1:40. See also revving, and loading the engine with the brakes and clutch. https://youtu.be/z3o53iBjR_Q
  9. Good Day, I have a 2014 DRZ400s with 4500km. Original chain and sprockets. During riding, at any speed really and in any gear, you can hear a "rattle" like sound coming from the what seems to be the front sprocket cover area. You can really hear it prominently if you lean over tot he left and listen a bit lower down. When you decelerate the sound goes away; but always there during constant speed riding. If I look down it does seem that the chain is doing some jumping. Chain rollers seem to look fine. Chain is adjusted as per the manual. Here is the key....If I over tighten the chain to where there is just 1/2 inch slack at the most the noise goes away. I also have the chain jumping when the bike is on a stand and just turing over slowly in first gear. From what I read this is normal...is that correct> Any ideas? Should i replace both sprockets and chain? Cheers Chargerman
  10. My buddy’s bike started making this sound after a few rides. Its hard to get it to shift and also seems to slide in and out of gear. When the bike is off and in neutral a loud clicking sound can be heard when rolling it, almost as if the chain is catching on the plastics. Any idea of what this could be? Shift fork? Shift linkage? I will try and attach a video via YouTube link: https://youtu.be/gvXolkkAzqc
  11. So, I'm kinda new to the big 4 stroke bikes. I'm not sure if im hearing things or it is normal noise for the bike or something is actually wrong. The bike in question is a 2015 rmz450 that I bought new in 2016 because, it was on sale and finally could afford a new toy. I've put less than 30 hours on the bike. The bike sat in my garage for a really long time not being ridden. I finally got around to digging her out. Checked the valves. They were in spec. Changed the oil and filter. I did find a small piece of metal stuck to the magnet that looked small and flat, kinda circular in shape. Possibly from clutch? Idk. Filter looked clean. I took it out for a ride and noticed kind of a slapping noise that was loudest while off throttle decelerating. I thought might have something to do with the cam chain or tensioner. Pulled tensioner and looked at it. It was approx 3 knotches out and seemed to function like it should. Anyways here is kind of a crappy video. Let me know if you hear anything abnormal or tell me I'm just crazy. https://youtube.com/shorts/d-lQdMtqnWc?feature=share
  12. I just finished rebuilding the bottom end of my 2002 yz426f. About three months ago, the connecting rod snapped while I was riding it in the trails, and then damaged the crankcase and a transmission gear. I replaced the gear, cases, and the rod. I just got it started up, and, once the bike warmed up, It started making a very loud rattling noise that sounded like it was coming from the top end. I checked the valves, and they are in spec. The camshaft bearings appear to be free-turning. The cam chain has plenty of tension, and the cams are in time. Any ideas as to why it would be rattling?
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