ntst8
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- Joined
- Feb 14, 2004
- Messages
- 1,750
Rode home recently on a sick bike, sounded like a single (i would like a single but not like this). One plug out at a time and no comp on the right cylinder. Head off and the right exhaust valve is slightly bent and not seating. The only other apparent damage is pitted seats for both exhaust valves - but....
The stem on the bent valve doesn't have the same shiny appearance of the other three, but not scored, and having pulled things apart the rocker spindles on the right intake and right exhaust have been bored completely through (and have a few grind marks on) whereas both on the left are dead end, there are no seals on the intake valves and no obvious recess for the seals on those valve guides. Also found a couple of rough looking shims instead of the rocker thrust washer in one case. All on an engine the was "professionally" rebuilt a few years back. This time its me and a friend doing the work, i'm the assistant.
So a few queries,
Rocker Spindles - dead end type is what we had expected - correct?, if so any thoughts on why the straight through ones??
Valve Seals - lack of seals doesn't seem to have caused any drama to date so tempted to stay as is.
Bike details, modified pre mkIII 850, head planed (pistons have valve pockets), cam - don't know, may try to measure push rod lift to get a clue?
Any feedback appreciated.
The stem on the bent valve doesn't have the same shiny appearance of the other three, but not scored, and having pulled things apart the rocker spindles on the right intake and right exhaust have been bored completely through (and have a few grind marks on) whereas both on the left are dead end, there are no seals on the intake valves and no obvious recess for the seals on those valve guides. Also found a couple of rough looking shims instead of the rocker thrust washer in one case. All on an engine the was "professionally" rebuilt a few years back. This time its me and a friend doing the work, i'm the assistant.
So a few queries,
Rocker Spindles - dead end type is what we had expected - correct?, if so any thoughts on why the straight through ones??
Valve Seals - lack of seals doesn't seem to have caused any drama to date so tempted to stay as is.
Bike details, modified pre mkIII 850, head planed (pistons have valve pockets), cam - don't know, may try to measure push rod lift to get a clue?
Any feedback appreciated.