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I would think that if the noise was being made by your transmission, it would start whenever you put the transmission in second gear and continue until you shifted to another gear, not at 19 mph only.
This sounds like a vibration that is specific to the engine rpm at that speed. It may sound like a grind but may actually be a vibration noise. Try to recreate the noise with the bike sitting still in neutral. Be careful not to allow the engine to overheat though.
Try other things to help you narrow down the source of the sound. When it starts, gently touch the brakes while maintaining the speed to try to eliminate the brakes. Does the noise change if you accellerated slightly or back off the throttle slightly.
It's very unusual for a transmission to make a noise in only one gear. I've found that if a transmission is making a noise, it makes the noise all the time but maybe louder at some speeds than others.
The grinding noise could be many things none good. Has the bike enough oil & is it being pumped round OK (does the radiator heat up?) If there was no grinding noise on the way home it could well have been the kick-start mechanism; as the footpeg fouled the kick-start, its mechanism didn't pivot far enough round to disengage from the ratchet. So the noise you heard was the mechanism returning but still in contact with the ratchet. This is the most likely answer.
When you adjust the decompression valve it actually depresses an engine inlet valve. You may well have adjusted it too far leaving the inlet valve slightly open as it fires, giving you back-firing in the inlet tract
Ride safe
Bike-Doc
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When does the noise occur, while driving only, or driving and idle, in gear, or in neutral and park? If it occurs all the time (while driving and at a stand still in cold weather) it could be the fuel pump. If it occurs only while driving, it may be a wheel bearing. Describe the noise (humming, grinding, whirring, etc), and what is the mileage on the Pilot? Answer my questions so I can fine tune my answer. Thanks!
I"m not an expert on the problem but personally I would let the little guy ride the wheels off it first before tearing it down. Anything could happen. As long as its safe. I mean, they grow so fast. So what if it leaks a little. Let the little chap lay it over a couple times first before you make it right. Besides, when he's older I doubt he'll remember about the drips it left on the concrete. After all, thats what cardboard is for! Right?
The rod should move side to side this is called little end side shake. the correct amount is .8mm to 1.3mm make sure the rod does not have any movement up and down on the bearing.If this is all good your knock may be from a worn piston. If its more of a grinding sound it could be the crank bearings.
-john
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