valve clearance check

[davehirt]

just had the first valve check done at 48000km.

1 2 3 4
29,29 29,30 28,28 28,28

18,19 20,20 18,20 19,19.


all good for a while yet.
also got a set of the pirrelli angel tyres fitted, mmmm feel good

[honda ng gingsa]

Any need to check the clearances unless you feel the bike not running at its best? Im at close to twice that mileage and have never cracked the case open.

[3dcycle]

manual says every 16k miles i dont recall any one adjusting them at that time but not 100% on that. mine checked perfect. if they get loose they will make noise if they get tight (which normally is not the case) it could start to hold the valve open to much and cause a poor running condition could back fire (intake valve held open) or pop from the exhaust more than normal (exhaust held open allowing raw fuel into exhaust) im not sure if the piston could hit the valve in this case in this engine though.

[nd4spdbh]

Originally Posted by 3dcycle

manual says every 16k miles i dont recall any one adjusting them at that time but not 100% on that. mine checked perfect. if they get loose they will make noise if they get tight (which normally is not the case) it could start to hold the valve open to much and cause a poor running condition could back fire (intake valve held open) or pop from the exhaust more than normal (exhaust held open allowing raw fuel into exhaust) im not sure if the piston could hit the valve in this case in this engine though.

actually tight valves are more common than loose ones in these type of motors. when the valve seat wears down as well as the valve face the valve seats higher in the head.... also the stem stretches from being slamed shut over time. zerod out or tight valves are the one to look for as they can get burned by not closing etc.

that being said.... in the 919 i honestly wouldnt worry too much at 16k mine were all well within spec and i ride the bloody piss out of it, and typically valves dont move much after the initial first thousand mile breakin.