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OK, so loaned it to a friend and the starter clutch went out the very next day. So i tore it down and replaced the starter clutch, i noticed the timing chain was stretched real bad. Replaced timing chain, realigned the balancer, i even went as far as to check the head while i had it down this far. Put it all back together and when i hit the start button i am feeling puffs of air coming out of the timing inspection ports when it is trying to start. I dont understand what could this possibly be. I inspected the top of piston and it was fine. I replaced rings about 75-100 hours ago. Is this normal? or am i being a bit to concerned. Any help is appreciated. Oh, one last thing, i took my time and im sure the timing is correct. Thanks guys
 

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OK, so loaned it to a friend and the starter clutch went out the very next day. So i tore it down and replaced the starter clutch, i noticed the timing chain was stretched real bad. Replaced timing chain, realigned the balancer, i even went as far as to check the head while i had it down this far. Put it all back together and when i hit the start button i am feeling puffs of air coming out of the timing inspection ports when it is trying to start. I dont understand what could this possibly be. I inspected the top of piston and it was fine. I replaced rings about 75-100 hours ago. Is this normal? or am i being a bit to concerned. Any help is appreciated. Oh, one last thing, i took my time and im sure the timing is correct. Thanks guys
PRETTY SURE THIS IS NORMAL. ON MY 660 AND 700 GRIZZLES YOU CANT TAKE DIPSTICKS OUT WHEN THEY ARE RUNNING, YOU WOULD SWEAR ENGINE IS SHOT DUE TO BLOW BY COMING OUT THAT HOLE.
NOT SURE IF ITS ALL THE MOVING GEARS,CHAINS, ETC IN THERE CAUSING ALL THAT TURBULANCE
 

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PRETTY SURE THIS IS NORMAL. ON MY 660 AND 700 GRIZZLES YOU CANT TAKE DIPSTICKS OUT WHEN THEY ARE RUNNING, YOU WOULD SWEAR ENGINE IS SHOT DUE TO BLOW BY COMING OUT THAT HOLE.
NOT SURE IF ITS ALL THE MOVING GEARS,CHAINS, ETC IN THERE CAUSING ALL THAT TURBULANCE
The turbulence / air pulsation you feel is from the piston movement drawing and pushing air with every stroke. That's why ALL four stroke engines have crankcase vents or PCV valves to relieve the pressures from the crankcase.
 
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