No worries Rob.
Fontyyy, (John), on here ran a very tired SP spec tuned engine last year. The engine was just a bit down on power.
He`s had a very good reliability record. Only recently the MC28 he runs cooked it`s PGM. I think he`s only had one mechanical failure which was his own fault, apparently. He`ll probably be along soon, to put me right!
I had a couple of seizures in my first outing at Mallory. They were my own fault too.
I rushed to get to the meeting. Didn`t have time to test the bike or set it up. Had to do that at the races!
Anyway, an old piston cracked just under the gudgeon pin boss. I didn`t know how old it was as it came with the bike. It looked serviceable and measured up okay. I should`ve just fitted the new piston I had anyway, in hindsight!
The second seizure I had was the other, lower cylinder. This was due to fitment of a rough second hand front head. As per the conversion for SP racing. This too looked serviceable, ended up leaking coolant into the combustion chamber, eroding the piston causing it to seize. My own fault again!
I had an 'R' head machined to SP spec, fitted this and had no more problems.
Like most problems, they`re caused by operator error!