enfield_trials wrote: ↑Thu Mar 26, 2020 10:21 am
@stinkwheel
thanks for your reply, why so many pistons/ parts change ... i heard bullet engine failure due to oil starvation ?
what are weakpoints in your view and do you recommend any mods ?
Indian pistons are made of elephant dung and melted down rupees so if you ride the bike hard, the piston crown eventually collapses and pinches the oil control ring. You can buy a forged piston but equally, you can buy 4 standard ones for the same price so I have tended to treat them as a service item.
In fairness though, one of them was taken out by the original head dropping its exhaust valve seat. The other was taken out by a valve failure.
I've also suffered from extreme levels of oil use for a long time now which leads to excessive coking and resulting damage to the piston crown.
I fitted a NOS meteor piston to it at the last rebuild. Seems to have hugely curtailed the oil useage and should be a lot less prone to crown collapse.