More wet sumping

[JulianS]

The oil you see spraying into the sump is probably from the pressure relief valve opening, it discharges excess oil into the sump. That is normal.

[chaz]

forgive me if wrong but arent Italian piston rings poor quality, and Australian? , newer Hepolite are not as good as the originals.

as for reboring over +.060 have a word with your local reputable motor engineer, my ,Bristol, engineer can usually come up with an alternative and he does fit liners as an alternative then you might pick up cheap zero standard pistons that others cannot use. He does do work outside Bristol mail order and does offer advice. 

[Mike Farmer]

 

Hi Agen. I obviously don't know where you are but I have just spoken to "the boss" at Owlesbury Crankshafts in Winchester Hampshire. They carry out this type of work. Relining single cylinder approx. £170 + VAT. You supply the piston. I have had a lot of jobs done by this company and can recommend them.

You might also try AD Engineering at North Scarle just to the north of Newark on Trent. Speak to Adrian. Again had a lot of work done by him. But he is usually bunged up with work and quite slow. He relined an A65 engine for me last year---good job.

Good luck. If you want fone no's etc, just ask.

Mike

[berniej]

Correction to my last reply - running with sump plate off won't indicate if the problem is from oil passing either valve guides or rings as there won't be any return flow to the top end - doh! Also, running like this there won't be any crankcase pressure at all to speak of.

Hope you make some progress in your diagnostics soon - it does sound like rings/bore. If the rings you're using are tapered check that they're fitted the right way up (typically marked 'top').

Regards,
Bernie

[TTJOHN]

You say that oil is passing through and spraying onto the rear tyre, I have had this and it turned out after a long battle that the oil was in fact coming from the rocker box nuts on the covers,  to sort this I fitted copper washers underneath the nuts, like you I was concerned as the oil was lying on top of the cylinder head and going all over the place but now sorted, HTH

TTJohn

[Greenfield]

I've now had the oil pump out and everything looks good. All the oil pipes are clear so there shouldn't be any pressure build up. The breathers on top of the gearbox, at the rear of the timing case and at the bottom of the inner timing cover and next to the camshaft nut are all clear. There are no leaks from the engine surface. The piston rings are the right way up. So by elimination I think the only thing left can be the bore. Yes there are some lines and I can only think that these together with new rings that aren't bedded in must be the root of the problem. So its bite the bullet time. I've sourced piston sets and a couple of engineering shops have been recommended, so I'll call round to see what they say.
Bikes of this age with little documented history can have many issues. Whatever I work on, I find evidence that someone has been there before. When I got the bike, included were several used head gaskets. I suspect that a previous owner thought as I did, that the oil could be entering the cylinder via the head. Hence one of my first jobs was to deal with the worn valves. All good fun!

[chaz]

second attempt at posting, French internet dosnt like the forum!!

have you done a compression test?
or if you have the head off, try pouring some oil on the top of the piston to see if it leaks past the rings