August 10, 20251 yr Hi team, Had an issue with my TY, engine ran away due to leaking crank seals, totally leaned the poor thing out and had to stall it to stop the engine. Replaced seals and upon re start very noisey, struggling to idle and noticing movement in the head and barrel so presumIng I have stripped the head studs. Has anyone else experienced this? Cheers Rob.
August 12, 20251 yr On 8/10/2025 at 5:02 PM, NobbyC said: Hi team, Had an issue with my TY, engine ran away due to leaking crank seals, totally leaned the poor thing out and had to stall it to stop the engine. Replaced seals and upon re start very noisey, struggling to idle and noticing movement in the head and barrel so presumIng I have stripped the head studs. Has anyone else experienced this? Cheers Rob. Maybe the cylinder studs or their aluminium nuts have stripped but that is unlikely. Maybe you have lost some of the cylinder base gasket. Maybe a leaking cylinder base gasket caused the initial runaway. Stripped head studs will not cause the barrel to move because the barrel is held in place by 4 (cylinder) studs at the bottom. I'm interested to hear what happened once you work it out.
September 10, 2025Sep 10 Author Hi again, after stripping head and barrel I discovered back two barrel bolts were able to be loosened by hand and a very thin and compromised base gasket. Manufactured a nice thicker new gasket, reassembled and torqued everything to spec and started 2nd kick and after warm up idled nicely, Hopefully bullet dodged. Cheers Rob.
September 10, 2025Sep 10 Good outcome. I suggest you re-torque the cylinder hold-down nuts after a couple of heat cycles. There's a good chance of generating another base gasket leak unless this is done.
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