DEAR SIRS, I HEAR A RAW NOISE COMMING FROM THE CAM AREA AT LOW RPM, WHEN I RAISE THE RPMS IT DISAPPEARS.
i WANT TO DISMANTLE THE HEAD TO SEE WHAT IS HAPPENING WITH THE CAM OR VALVES.
MY BIKE HAS ONLY 20.000 KMS.
iTS A YAMAHA CRUX 110.CC
CAN YOU HELP ME WITH A REPAIR MANUAL FOR DOWNLOAD IT,? or a little help.
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As you saying noise wont come in driving and only comes in idle , it means noise will not come if RPM is high by norma in idle l, try this one start the car don't drive it just raise RPM(rotation per minute of only engine not vehicle speed) in neutral gear , if noise disappear that mean it a problem of drive belt . If drive belt is got less tension then also it can occur or belt is damage, replace belt problem will solve, (for reference drive belt it drive alternator,powersteering pump,A/C compressor that is made by rubber).Thanks if any problem ask me. Yogesh.
The sound you hear is most likely the brake pad wear, not the caliper. When pads start to wear down, they will start to make grinding noise,and not necessarly all the time. As the pad wears down more, then the grinding will be hear consistently.
It could also be a worn hub bearing. Jack up the vehicle and spin the tire and see if you can recreate this noise. Use jack stands to support the vehicle.
Does the oil light come on or the knock occur during the engine warm up after a cold start?
There could be a couple of problems causing the issue. You could have an oil pressure pump or pump pressure regulator sticking. I would have a mechanical oil pressure gauge installed and verify oil pressure at idle and 2500 rpms to make sure oil pressure is in normal ranges.
You could also have excessive piston rod bearing, crankshaft bearing or cam shaft bearing wear that will cause oil pressure to drop too low to prevent the rod knock your hearing at 2500 rpm.
You said a knock and not a ticking noise,so I don't believe a lifter is the issue at 2500 rpm.
Start with the oil pressure check and go from there.
Let me know.