ES2 problems

Such a big ring gap suggests to me that a standard piston has been put in an oversize bore. I had a similar problem with an old single Matchless years ago. Get the measuring stick on it....Just a thought.

If you want the job doing properly take it to Mike Pemberton. Top engineer in my opinion.

Sounds like a ring problem, I understand that the grade and method of final hone should match the ring type,which is not always considered.could also be that the bore is not round,

A bit more information would help, what make of piston ,ring manufacterer,oil type used, check fuel tap for flow when closed and float valve ,fuel wash can be very detrimental to bore health and oil contamination bad for bearings.Crank end float is also bad for big end and piston.

A bit more information would help, what make of piston ,ring manufacterer,oil type used, check fuel tap for flow when closed and float valve ,fuel wash can be very detrimental to bore health and oil contamination bad for bearings.Crank end float is also bad for big end and piston.

Check your oil pump, and the oilways to the big end. It may be inferior Ring material. try to get best quality rings available. I agree Bore washcould be causing these problems too.

Its most unusual to get those two problems together at such low milage,If the oil is not getting to the big end --then it won't get to the bore either.Its all too easy to put it all back together and find that the problem re-occurs. Keep looking till you are sure you have found the cause . I well remember taking my Austin Healy engine appart twice before i found that the knocking and fluctuating oil pressure was caused by a broken crankshaft that ran ,drove and was quite happy to be in two pieces.!.Check oil drains freely from the tank all the way down to the pump.

I'm currently rebuilding a 900 Ducati bevel drive engine that was running ok before i stripped it. During the strip i could find no way that the pump could supply the big end!!, Splash feed!!.

Hi. do you have a tap on the oil feed from the oil tank.

With the pump removed there should be a good flow of oil. The pump does not suck well.

Hi the reason i asked if you have a tap fitted is the flow of oil isn't great through a normal petrol type tap i would use a 8mm inline ball type valve full flow if you haven't already. if you look down a normal petrol tap hole its not that big restricting the oil flow more so when cold to a basic drip feed. the engine might be getting enough to stop it seizing up but not enough to stop it from going metal to metal and over heating. as for the tap idea. on mine i have a buzzer that stays on until i switch the oil on and then a green light stays on so i know oil is on plus clear piping so i can have a visual as well.i wasn't having a go at the tap idea i was only trying to help. Baz

Its also possible to get the pipes crossed!! , You would think a motor would only last a few miles like this,but roller and ball bearings can run with a smear of oil as its mostly there to cool , Too much oil through a roller bearing is just as bad as too little.