Rapidroy Posted July 15, 2018 Report Share Posted July 15, 2018 Rubber seal part number 12312-nn4-000 the bike popped and the seal disappeared of the bike today cant find the seal Has anyone came across this before ? Possibly down to the head breather blocked Anything else I need to check ? Need to track down the part Quote Link to comment Share on other sites More sharing options...
Rapidroy Posted July 15, 2018 Author Report Share Posted July 15, 2018 (edited) Thanks will start ringing around on Monday looks like the head breather tube was connected to the air filter box instead of the crank breather tube Would that be enough to pop the seal? Edited July 15, 2018 by Rapidroy Quote Link to comment Share on other sites More sharing options...
jonnyc21 Posted July 15, 2018 Report Share Posted July 15, 2018 40 minutes ago, Rapidroy said: Thanks will start ringing around on Monday looks like the head breather tube was connected to the air filter box instead of the crank breather tube Would that be enough to pop the seal? I wouldn't expect it to be, however I never done that before so don't know for sure. I have been surprised many times in the past at what I have seen happen with miss configurations, so wouldn't put it past it being able to. Quote Link to comment Share on other sites More sharing options...
section swept Posted July 15, 2018 Report Share Posted July 15, 2018 The underside of the piston on any downward stroke will create a pressure in the crankcase. If this pressure cannot vent or escape it will find or make its own way out, such as blowing oil out of the main bearing seals, forcing oil seals out of their housings etc. So your breather pipe looks as though it was the issue here. Make sure all breathers are correctly routed and fitted to the correct inlet or outlet, check to make sure no breather pipes or connection points are blocked. Excess crankcase pressure can severely restrict engine performance.?? Quote Link to comment Share on other sites More sharing options...
jimmyl Posted July 15, 2018 Report Share Posted July 15, 2018 I’m sure any Honda dealer will sort you out. If you have a part number they won’t care what bike it’s on . The beauty of owning a major manufacture made bike. probably get it next day?? Quote Link to comment Share on other sites More sharing options...
cleanorbust Posted July 15, 2018 Report Share Posted July 15, 2018 1 hour ago, section swept said: The underside of the piston on any downward stroke will create a pressure in the crankcase. If this pressure cannot vent or escape it will find or make its own way out, such as blowing oil out of the main bearing seals, forcing oil seals out of their housings etc. So your breather pipe looks as though it was the issue here. Make sure all breathers are correctly routed and fitted to the correct inlet or outlet, check to make sure no breather pipes or connection points are blocked. Excess crankcase pressure can severely restrict engine performance.?? An article by one of my favourite authors on a topic related to your last sentence: www.cycleworld.com/its-obvious-once-you-understand-it 1 Quote Link to comment Share on other sites More sharing options...
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