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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
I apologize but I am having a hard time trying to figure out the sound you are discribing, is there any way you can upload a sound/video file to youtube or anywhere else?
If you have not already done so you may want to check the pump and compression. At the very least if you can remove the seat with the engine running and see what area it seems to be the loudest coming from.
Thank you!- Joe
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