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Hi Omer this is normal for many of these off road machines it is caused by cold air being vacuumed up the exhaust once the throttle is released. It causes noise like thunder where warm air collides with cold. If the exhaust system is good with no leaks thers nothing that can be done. Regards Jim...
My lawn tractor with a Kawasaki engine had the same problem. I found that the linkage for the gas throttle had a lot of dirt on it and would not let the throttle close completely. So when I shut off the warm engine, gas leaked into the cylinder. It would take a lot of cranking to start. When it did start, the exhaust put out black smoke.
most likely a fuel issue. has it been sitting up ? if so if its got a carb it prob gummed up, pour some seafoam into the gas tank with fresh gas and run it, try and keep it running with the throttle, it might clear some varnish out the carb if it not too bad, if tht dont work and it is a carb engine then the carb will have to be removed and cleaned. if it a FI engine then you got a bad full pump more than likely
I have a 2004 700 carb that shut off while riding and then would start up 3-5 minutes later after many nights working on it Ifinally figured it out no help from any dealer. There are 2 circuit breakers under the front rack mine were very rusted, Replaced both never had the problem again. My situation was always only when the lights were on.
Hope this helps