Subject: header pipe loose, making a valve like clatter Thu May 30, 2019 4:47 am
My GRiSO had a noise from the left head when cold that sounded like loose valve clearance , but disappeared late in the day when it was warmer. Tracked it down to a loose header pipe. Seems the factory "lock' washers do a poor job of it, and loosened again @100 miles or so. I used some stainless 5/16 split lock washers and replaced all 4 on both sides. Torqued again to 18 ft lbs. 25Nm. Seems to have taken care of it.
Bill Hagan GRiSO Capo
Posts : 1722 Join date : 2014-07-03
Subject: Re: header pipe loose, making a valve like clatter Thu May 30, 2019 4:52 am
A classic issue. Glad you tracked it down.
I was in a panic when that first occurred on my Ballabio.
Since, have done PM to keep from happening.
Bill
beetle GRiSO Capo
Posts : 10058 Join date : 2013-09-30
Subject: Re: header pipe loose, making a valve like clatter Thu May 30, 2019 5:01 am
I've had this happen, often. It never occurred to me to use spring washers until Ron (waterbottle) mentioned it. Not a sausage, since.
Subject: header pipe loose, making a valve like clatter 
Thu May 30, 2019 4:47 am
