if you bought your walbro off ebay, theres a good chance its a knockoff… 99% of them on their are knockoffs… while most of them are fine and work just as good… few have been prone to failure and I have heard i ngeneral they are louder than your normal walbro
heres one i could find… theres a few more discussing this issue as well
Well I bought it from Synapse.So I would hope it’s offical.