I have a 2010 Griso 1200 8V that was rollerized by a previous owner back in 2016 with some 16,000+ miles on it. I'm trying to get a fix on just why the parts manual calls out two different part numbers for the nuts used to set the valve adjusting at the rocker arm. In my Guzzi digital shop manual they are both shown as being #11. The first is referred as 'old' M1 (# 484819) and the second is referred to as 'new' M2 (# 879916). Beyond that there are no specifications. At least not in English.
Since I, like many others, have been working with the impression that 'old' indicated pre-roller and 'new' indicated a roller assembly the thinking is that part # 879916 is the correct adjusting nut for a rollerized engine while the 'old' one is for the previous non-rollerized engines.
So, first question, does the roller kit also include entirely new rocker arm assemblies and all that goes with it including the rocker arm adjustment rod as well as a new nut or does the swap resue the original rod and nut? If it allows for reuse of those parts than wouldn't the 'old' part still be used?
To further muddy the water the parts manual also shows that for the right cylinder head there are not only 2 numbers for the adjusting nuts but also two numbers for both the rocker arm adjusting rod AND the adjusting screw....WHILE the same manual when refrreing to the left cylinder head shows only ONE part # for each piece and that number is the 'old' or M1 part #
Is that clear as mud and does it mak any sense at all? How can the same engine have different part #'s doing the same job with the only difference being which side of the bike they're on. One side has only one part number for a certain piece while the other side has two parts with the with two different #'s for a part doing the same job as the one on the other side.
For those who know just what are the specs. for the adjusting nuts themselves. I know they are both M6 but there is most definitely a differnce in thread pitch?
Stein -Dinse states that the 'old' M1 piece 484819 is an M6 x 0.75 but I haven't been able to pin down the thread pitch for the 'new' M2 879916 nut.
One thing I know for certain is that part # 879916 will NOT fit the valve adjusting posts installed on my right cyclinder head and by eyeballing the threads they're a definite difference in the threads bwteen the existing nuts and the new replacement nut.
Since I, like many others, have been working with the impression that 'old' indicated pre-roller and 'new' indicated a roller assembly the thinking is that part # 879916 is the correct adjusting nut for a rollerized engine while the 'old' one is for the previous non-rollerized engines.
So, first question, does the roller kit also include entirely new rocker arm assemblies and all that goes with it including the rocker arm adjustment rod as well as a new nut or does the swap resue the original rod and nut? If it allows for reuse of those parts than wouldn't the 'old' part still be used?
To further muddy the water the parts manual also shows that for the right cylinder head there are not only 2 numbers for the adjusting nuts but also two numbers for both the rocker arm adjusting rod AND the adjusting screw....WHILE the same manual when refrreing to the left cylinder head shows only ONE part # for each piece and that number is the 'old' or M1 part #
Is that clear as mud and does it mak any sense at all? How can the same engine have different part #'s doing the same job with the only difference being which side of the bike they're on. One side has only one part number for a certain piece while the other side has two parts with the with two different #'s for a part doing the same job as the one on the other side.
For those who know just what are the specs. for the adjusting nuts themselves. I know they are both M6 but there is most definitely a differnce in thread pitch?
Stein -Dinse states that the 'old' M1 piece 484819 is an M6 x 0.75 but I haven't been able to pin down the thread pitch for the 'new' M2 879916 nut.
One thing I know for certain is that part # 879916 will NOT fit the valve adjusting posts installed on my right cyclinder head and by eyeballing the threads they're a definite difference in the threads bwteen the existing nuts and the new replacement nut.