tomlord2301 Posted August 11, 2013 Report Share Posted August 11, 2013 ive recently bought a gasgas 280 txt 2000 model and the bike randomly makes a hissing/puffing noise coming from around the electrics/engine area. i cant put my finger on when the bike does it as it can do it 3 times in a minute and then not again for half an hour. I was just wondering if anybody has encountered this problem before and could guide me to what it could possibly be? Quote Link to comment Share on other sites More sharing options...
lineaway Posted August 12, 2013 Report Share Posted August 12, 2013 Take off the flywheel cover. Some times it could just be the cover. Run it. If it still does it the mains could be bad or just the main seal. If you grab the flywheel with both hands (not running) you can tug up and down. If you feel movement, the main bearing is bad. Quote Link to comment Share on other sites More sharing options...
thats_a_five Posted August 12, 2013 Report Share Posted August 12, 2013 Does the fan come on after you have been riding? Hissing could be coolant or steam escaping from the radiator cap. Have ypou checked the coolant level? Quote Link to comment Share on other sites More sharing options...
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