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I was on my kymco scooter the other day and it suddenly made a loud rattling noise and their was no power going to the revs. engine starts but makes a bad noise especially when i rev it please help
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Remove both spark plugs and test each cylinder for compression. Just press your thumb over the spark plug hole and crank engine. A good cylinder will forcibly push your thumb away with a pfft sound. Likely you'll find one cylinder has no compression.
If you have a dead cylinder, remove the rocker arm cover and assess the damage. If you're lucky you'll find a push rod out of place with no other damage.
spraying WD40 on drive belts is not a good option as it can cause slippage it is better to use silicon spray or ordinary soap,rub the soap on the belt when the engine is stopped,as for the squeak it could well be the tensioner replace it first it may be the cheapest to start with.....hope this helps....cheers
When catalytic converters go bad, the porcelain matrix inside comes loose and is noisy. But you can just unbolt it, break up the loose chunks, pour out the pieces, and it will run better than ever. If you don't pass the next emissions test, then replace it.
But it could just be the heat shield rattling instead. Take the shield off first, to see if it goes away.
If the rattling changes with the revs of the engine, it might be that the valve compensators are either worn or not getting enough lubrication. 20V engines have quite small oil passages travelling to the head. They tend to clog up with gunk if the oil change is not frequent enough.
4.0l's are notorious for valve rattle on cold start-up. There is really nothing you can do to make it go away short of completely replacing the valve train in the top end, and that isn't a permanent fix. It's is an top end oiling issue from the factory. Just don't race your engine on cold start-up until the rattle stops.
The rattle in the transmission sounds to me to be more of a loose dust shield/heat shield around the transmission or exhaust than a mechanical issue.
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