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Found 3 results

  1. Hello TT universe… I've come across an interesting noise, and I can't quite pinpoint exactly what is causing it. It's a metallic pinging noise, it sounds like it's coming from either the front or top of my cylinder. It happens quite loudly at low rpms, especially when cold, however it does seem to continue even once the bike is thoroughly warm and ridden for a while. I uploaded a clip of the best audio i could get to youtube at this link : You can really hear it around the 4 sec. mark. The bike is a 2004 husqvarna cr125, 75 hours on the current vertex piston, 19 on the ring set. I run 91 pump gas mixed at 28:1 with Torco GP-7. So as usual, I decided to hit my marks to see if I could figure out what was going on. Pulled the top end apart and inspected the piston and spark plug for signs of a lean condition. Piston head shows clear carbon build up right around intake ports, and less build up around exhaust ports, which kind of makes sense. Picture also attached. Spark plug is chocolatey brown. Does not appear to be excessively lean, so I feel like it may not be detonation? Performance wise, the bike is not at all sluggish or boggy. Very responsive and smooth under heavy acceleration and when I need to access mid-rpm torque up through over-rev. This bike also eats up exhaust o-rings with the FMF pipe. I've adjusted the metal tabs for the rubber damper mounts on the expansion chamber, and since then its not as bad. I checked over the exhaust system before the tear down and all bolts were tight, exhaust was securely in the cylinder. I was thinking maybe it could be the exhaust rattling around. Maybe the piston is worn past tolerances and resulting in extra noise? Anyone have and ideas?
  2. Been trying to diagnose pinging issue firstly got a 430 main jet to try but noticed the rc valve was lose as &%$#@! not sure if that would ever create a ping type noise at 3/4 throttle. When inspecting the exhaust valves i did notice towards the ends of the valves that touch the cylinder they was greyish I am thinking now this is defiantly pinging and its to lean on the main jet?
  3. So here's my problem. I just rebuilt my top end (big bore kit) three tanks ago because my other piston had shattered it's skirt in two places. Had the bottom end rebuilt too with new bearings, new oil pump. I start riding it, and when I'm on the highway going 55mph, everytime i open the throttle >10%, i hear this rattling, knocking sound as if my valves were noisy. As soon as i let go of the throttle, sound goes away. Sound doesn't happen at idle, or even when cracking the throttle at idle. I suspected pre-ignition or detonation so i removed my spark plug and checked down my piston and here's what I found. Keep in mind the spark plug and piston are 3 gas tanks old. Bike idles super well, and bogs when I crack open throttle at 100% really fast, then recovers and revs up. Please any thoughts would be really aprpeciated. Maybe I'm just pannicking (hopefully)!!! Pics: SPECS: -Elevation: 540ft. -2001 DRZ400S Converted SM -Has manual cam chain tensioner and yes i know how to adjust it (idle and screw until click goes away) -434cc Cylinder Works Big Bore kit installed 3 gas tanks ago -3x3 Airbox -Pro Circuit T4 Exhaust with spark arrestor -Twin Air Air Filter -Stock Cams -Has FCR39MM Installed with following jets: -I always use 91 octane fuel ===>Coast enrichener removed and the two nipples plugged together with fuel hose ===>160 Main Jet ===>200 Main Air Jet ===>65 Starter Jet ===>60 Pilot Air Jet ===>45 Pilot jet ===>My needle is a OBDXP and the clip is at position 5. Spark plug: CR8E IX
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