Help me with enigine knocking noises while lugging engine
Posted May 10, 2006 - 07:09 PM
Posted May 10, 2006 - 07:16 PM
Posted May 10, 2006 - 07:19 PM
Posted May 10, 2006 - 08:53 PM
Posted May 10, 2006 - 09:26 PM
Its even worse on the gearbox, instead of the consistent load one one side (drive) you get the impacting affect, ie cost/drive/coast sides of the gears are beat up. This is east to do with the higher compression ratios, and the pistons rolls past TDC with more violent force from the extra squeeze. Where as a lower compression engine,t eh piston rolls past TDC wi th ease and little impacting, much smoother. With higher compression engines, lugging is OK, but dont load it while its lugging. If you need to get on the throttle, knock it down a gear first or give it a power hit with the clutch
whatever the sound is, lugging your engine trashes the rod and main bearings. it aint no diesel son.....
Posted May 11, 2006 - 02:14 AM
I don't condone riding without a helmet, be careful ! This was suggested to me when I first heard it and I have a 1/2 mile long driveway to ride slow and safe.
Posted May 11, 2006 - 09:18 AM
Posted May 11, 2006 - 09:56 AM
If it is engine knocking and not your chain you probably need a higher octane gas or even a different brand will help sometimes.
It's funny you mention that but in my manual it states to use 99+octane, even in the WR motor. Any truth to that as my WR occassionally gives me that, "DUNG DUNG DUNG DUNG" sound.
Posted May 11, 2006 - 12:42 PM
Posted May 11, 2006 - 04:29 PM
Posted May 11, 2006 - 06:28 PM
Posted May 13, 2006 - 10:51 AM
Posted May 13, 2006 - 12:11 PM
Make sure your are running premium in it. Premium has a slower burn rate and can withstand higher pressures before spontaneously combusting without the help of a spark plug. If you are running an 87 octane/13 heptane mix, on an engine with a 12.5/1 compression ratio, then the gas will ignite before it hits TDC causing knocking. 93 octane/7% heptane always always always.
I agree, I think you are hearing a pre-ignition condition, also known as "detonation", "spark knock", and "pinging". Even with premium gas, a hot engine can detonate under heavy throttle when the rpms are low.
Posted May 13, 2006 - 04:01 PM
Posted May 19, 2006 - 04:48 PM
Posted May 19, 2006 - 10:33 PM
It was the chain, I removed the two top screws on the chain cover and cleaned it and siliconed between it and the arm, let it dry, and the noise is completely gone, awesome fix guys, thanks.
You'll still hear it again from time to time, it's perfectly normal and does not mean your thrashin' your bike. 2 WR's in 6 years and I hear it every time I ride, if you race or ride single track fast it will be heard all the time.
Posted May 19, 2006 - 11:51 PM
I notice if i lug the engine on my new bike (up a gear more then i should be) and crack the throttle the engine knocks something fierce, is this normal? is it piston slap? will it hurt anything, should i keep geared down a bit lower to avoid it? sorry but im use to 2 smokes......
my 2004 WR450 used to do this until I installed the JD jetting and the zip/ty fuel screw. All noises gone now and huals butt!