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Thread: It begins....again! Reply to Thread
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  Topic Review (Newest First)
09-21-2019 2:12 PM
oldbastard
Quote:
Originally Posted by dualheadlamps View Post
Good read, where are the pictars?

BTW, what driving behaviour causes this?:

I'm guessing it was caused by hundreds of ham- fisted clutchless 1st-2nd gearchanges. It was from an engine I bought without being able to run it....🙄
09-21-2019 2:07 PM
oldbastard
Quote:
Originally Posted by IanDoohan View Post
Maybe with the new cylinders it needs more run time <img src="https://www.fireblades.org/forums/images/smilies/dunno.gif" border="0" alt="" title="I dunno" class="inlineimg" />
Just did a 2 day run to Luxembourg, mix of freeway/motorway to get most of the way there, and motorbike paradise there, loads of hills and winding perfect blacktop, not track day effort but a good workout nevertheless. 500 miles done and NO OIL USED. So you were right Ian. I've still got a silly grin on my face, it was worth all the effort. Engine sounds like brand new.&#x2764;&#xfe0f;&#x1f601;
08-21-2019 3:20 AM
dualheadlamps
Re: It begins....again!

Good read, where are the pictars?

BTW, what driving behaviour causes this?:

08-18-2019 8:39 AM
89forever
Re: It begins....again!

Quote:
Originally Posted by oldbastard View Post
Castrol R was the oil of choice for racing motors, and the aroma of that haunts me to this day, it was THE smell of bike racing from my youth.
Ah the memories of that aroma..... they should have made it an aftershave...
08-17-2019 9:34 PM
IanDoohan
Re: It begins....again!

Quote:
Originally Posted by oldbastard View Post
Mineral oil is the term that I guess used to be used to distinguish vegetable based oils (like Castrol R, ) from oils derived from crude oil, which comes out of the ground like other minerals. Before synthetics came along, Castrol R was the oil of choice for racing motors, and the aroma of that haunts me to this day, it was THE smell of bike racing from my youth. So the oil I used for break-in was a normal non-synthetic 15/40 . As advised by the guys who did the rebore and honing for me. I guess it will have to wait until the end of the season to find out what's up with it, in the meantime the compression is excellent so I guess sticking a bit more oil in won't do any harm.
lol Thanks you old bastard, I feel like that makes more sense to me.

Maybe with the new cylinders it needs more run time
08-17-2019 6:07 PM
nigelrb
Re: It begins....again!

Oh for a bottle of Castrol 'R' now.

Yep, I did the race circuits in the 70s. Castrol 'R' and 'M' and some bikes running on straight methanol.

If I could get one of those e-cig Vape things to puff on 'R', I'd be there!!
08-17-2019 1:51 PM
oldbastard Mineral oil is the term that I guess used to be used to distinguish vegetable based oils (like Castrol R, ) from oils derived from crude oil, which comes out of the ground like other minerals. Before synthetics came along, Castrol R was the oil of choice for racing motors, and the aroma of that haunts me to this day, it was THE smell of bike racing from my youth. So the oil I used for break-in was a normal non-synthetic 15/40 . As advised by the guys who did the rebore and honing for me. I guess it will have to wait until the end of the season to find out what's up with it, in the meantime the compression is excellent so I guess sticking a bit more oil in won't do any harm.
08-17-2019 8:56 AM
skant153 Mineral oil oxidation doubles every 10 degrees above 75 C. Conventional motor oil begins to oxidize above 115 C. High temperature oils can withstand up to twice the temperature before begining to oxidize. I guess if the idea is to have the oil break down to aid in seating the rings, mineral oil would work but the short oil life means you'd be damaging the engine very quickly if you left it too long. Perhaps that's why you're burning oil?
08-16-2019 9:14 PM
IanDoohan
Re: It begins....again!

Quote:
Originally Posted by oldbastard View Post
Break in was done with mineral oil, 15/40. Oil and filter changed at 20 miles and 200 miles. Gave it reasonably plenty of gas in the first 20miles to encourage the compression rings to do their job while they still were sharp. First oil looked a bit like thinned aluminium paint, but that was expected. No dramas, the JE pistons slap a bit when cold but so did the original items. When it's warm it sounds perfect.
Erm....what else...oh yes, the ring gaps were all carefully checked using the pistons to push the rings down a couple of centimetres in the bores. Maybe it's the same phenomenon as the 2008 blades?
What da fck does mineral oil do? Iíve never heard of that. Iíve always used a standard petroleum 10w-40 after a rebuild to get the rings to seat, and have never had a bike consume oil. Even in my 93 rebuild from 2013. Not a drop to refilled. Obviously if the mineral thing has worked for you in the past or you know of some magic itís supposed to work then ok, but I donít think anyone in the US would use mineral oil. Just not something Iíve ever heard of. Does it have detergents in it? What characteristics does it have that conventional motorcycle oil doesnít? Can it handle the shearing forces of the transmission, and still hold up to clean cool and lubricate the engine? I donít mean to sound like a fool, but Iíve just never heard of that. Thatís what I would point to though, all else being proper.
08-16-2019 2:31 PM
oldbastard Break in was done with mineral oil, 15/40. Oil and filter changed at 20 miles and 200 miles. Gave it reasonably plenty of gas in the first 20miles to encourage the compression rings to do their job while they still were sharp. First oil looked a bit like thinned aluminium paint, but that was expected. No dramas, the JE pistons slap a bit when cold but so did the original items. When it's warm it sounds perfect.
Erm....what else...oh yes, the ring gaps were all carefully checked using the pistons to push the rings down a couple of centimetres in the bores. Maybe it's the same phenomenon as the 2008 blades?
08-15-2019 11:33 PM
IanDoohan
Re: an oily puzzle

Quote:
Originally Posted by oldbastard View Post
I've been enjoying the summer with my rebuilt 929 now 954 engine, but was a bit disappointed with the oil consumption. About half a litre per 1000km. Not enough for visible smoke, but enough to be annoying. All kinds of dark thoughts start arising, so in the end pulled the plugs and did a compression check, just to get a feel for the general state of the rings. All 4 cylinders gave 200psi, which is not bad for 12.5:1 pistons. I looked at the oil which has been in there since may, dropped a litre of it (diluted with gas) through a filter paper to see what debris was lurking. Not much, and not spectacular. A few last tiny specks of aluminium, presumably still hanging around since the break-in, no copper thank God, I even cut open the filter and flushed it out to look at what had been caught, and again, hardly anything.
So what gives? The pistons are from JE, are their oil control rings known for not being as good as Honda OE? Before the rebore the engine used virtually no oil. The spark plugs are clean and light tan colour, no oil in the threads. Oh, and I fitted new valve oil seals in the rebuild. I'd appreciate your thoughts.
One last thing: I sometimes notice oil on the outside of the oil level check window. No oil tracks on the engine, none in the fairing, do these ever get leaky? I don't spill oil when I fill it.
What oil did you use for the initial break in? Make, viscosity, synblend, full, or regular?
08-15-2019 2:34 AM
Jeff Kain
Re: It begins....again!

it will
08-13-2019 9:25 AM
feelfree
Re: It begins....again!

maybe the rings are still seating?
08-12-2019 3:37 PM
oldbastard
an oily puzzle

I've been enjoying the summer with my rebuilt 929 now 954 engine, but was a bit disappointed with the oil consumption. About half a litre per 1000km. Not enough for visible smoke, but enough to be annoying. All kinds of dark thoughts start arising, so in the end pulled the plugs and did a compression check, just to get a feel for the general state of the rings. All 4 cylinders gave 200psi, which is not bad for 12.5:1 pistons. I looked at the oil which has been in there since may, dropped a litre of it (diluted with gas) through a filter paper to see what debris was lurking. Not much, and not spectacular. A few last tiny specks of aluminium, presumably still hanging around since the break-in, no copper thank God, I even cut open the filter and flushed it out to look at what had been caught, and again, hardly anything.
So what gives? The pistons are from JE, are their oil control rings known for not being as good as Honda OE? Before the rebore the engine used virtually no oil. The spark plugs are clean and light tan colour, no oil in the threads. Oh, and I fitted new valve oil seals in the rebuild. I'd appreciate your thoughts.
One last thing: I sometimes notice oil on the outside of the oil level check window. No oil tracks on the engine, none in the fairing, do these ever get leaky? I don't spill oil when I fill it.
03-22-2019 2:25 PM
MrPickwick
Re: It begins....again!

Quote:
Originally Posted by oldbastard View Post
After a few hiccups, got it all back together, and it seems ok. More than OK actually, you can feel it loosening up with every mile. Not a huge amount more power nor did I expect it, certainly not from the capacity increase which might get you 3bhp, and the compression increase maybe another 3. But happy. and so is my wife, most of my home life has been in the garage recently....
Nice one OB
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