Fast Eddie
VIP MEMBER
- Joined
- Oct 4, 2013
- Messages
- 20,589
I just gave the 920 a once over, ain‘t gonna use it much this year me thinks but def got some plans.
Anyhoo, it’s not done much mileage since the 920 build, about 1,500-2,000 I guess, but it has gotten a few track sessions under its belt now.
Firstly, the head fixings had not lost ANY torque. I cracked ‘em back, then torqued ‘em up and they were in exactly the same place.
Tappets hadn‘t moved at all either.
Given this is a relatively recent build, and it has an alloy barrel (Maney) I was very pleasantly surprised.
The reason for posting is this: I credit this lack of crush / movement to the wasted stem head fasteners. I’m convinced the ‘give’ they have prevents excess crush on the clamping faces and that when things heat up / expand and cool / contract, the fasteners yield and return.
Well worth considering IMHO.
Anyhoo, it’s not done much mileage since the 920 build, about 1,500-2,000 I guess, but it has gotten a few track sessions under its belt now.
Firstly, the head fixings had not lost ANY torque. I cracked ‘em back, then torqued ‘em up and they were in exactly the same place.
Tappets hadn‘t moved at all either.
Given this is a relatively recent build, and it has an alloy barrel (Maney) I was very pleasantly surprised.
The reason for posting is this: I credit this lack of crush / movement to the wasted stem head fasteners. I’m convinced the ‘give’ they have prevents excess crush on the clamping faces and that when things heat up / expand and cool / contract, the fasteners yield and return.
Well worth considering IMHO.