I was getting a bit worried too, thought those busybodies (polite terminology) had stuck the oar in again !. Anyway, been enjoying following this rebuild, giving me inspiration and kick up the backside I need to get on with my 750. She has been off the road a year now, gathering dust in the garage !.
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J
jdknicks
Guest
Your work is amazing! I'll be following closely, hoping to see Jennifer on the road sooner rather than later!
F
Faultysa
Guest
Took me the last 2 days to read this. So inspired its an awesome build. Keep going. I would love to come past and take a look.
Just go balls out and fvck the home owners association....youll have her done before all the scheduled meetings and arbitration....stall them off and just get her done. By cover of midnight if need be.
Don't worry, he is... He's also in the parts acquiring stage as we speak. I have his seat, a spare harness, four turn signals and 'possibly' a left hand control that our postal service was so gracious to loose along with the NOS case emblem you sent me. Plus there's a certain 318i camshaft that went out to lunch never to come back. I'll let him tell you about that one.
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F
Flyboy
Guest
Thanks for the words guys, Faulty, you welcome, we need to get together and suck on a few cold ones, and talk loose women and fast motorcycles. 
I am no guru and without this crowd of misfits would not even be half way.
Good guys, all of them.
Special thanks to Dale who has been a trooper of note.
Yeah Chuck, getting there slowly, just when you start gathering momentum, something always comes up to break your speed.
Said camshaft that went out for lunch. :-\\\
I am no guru and without this crowd of misfits would not even be half way.
Good guys, all of them.
Special thanks to Dale who has been a trooper of note.
Yeah Chuck, getting there slowly, just when you start gathering momentum, something always comes up to break your speed.
Said camshaft that went out for lunch. :-\\\
M
MAJikMARCer
Guest
HOLY BALLS! How does something like that happen?? How badly damaged is the rest of the top end?
Said camshaft that went out for lunch. :-\\\
F
Flyboy
Guest
hahahaha, Marc, believe it or not, that came out of a running engine, down on power, and running on half its pots, but running none the less.
The rest of the head is fine, you can see the cam journals are unmarked, there is a spraybar that lives above the cam that supplies splash lube to the lobes, these holes clog up depriving the lobes of oil.
New parts have been bought, tomorrow is going to be spent dropping in the new cam, so I should be mobile again by tomorrow night.
The rest of the head is fine, you can see the cam journals are unmarked, there is a spraybar that lives above the cam that supplies splash lube to the lobes, these holes clog up depriving the lobes of oil.
New parts have been bought, tomorrow is going to be spent dropping in the new cam, so I should be mobile again by tomorrow night.
F
Flyboy
Guest
Ok so oday was spent assessing engine wear to put together a shopping list for parts (praying profusely for miracles because $$$ is non existent at the moment)
However, being the realist I am, I prepared myself for some scary measurements and worn bits, remember, this motor has done just on 375000Km and never had more than the valve cover off for valve adjustment.
So today I measured the ring end gaps, hoping that if they were not too far past service limit, a fresh set of rings will bring them back into limits and I can avoid a rebore,
Now, in 30 years of riding GS motorcycles, I have seen most of it, and seen it twice again, and like most folk here, have a healthy respect and loads of admiration for the GS series motorcycle, and its bullet proof engineering.
But just when you think you have seen it all, there is always something that blind sides you and leaves you shaking your head in admiration, today was such a day.
First thing I need to make clear is that I measured the ring end gaps with the old rings that came out of the motorcycle, not new rings, yes, the ones that have done 375000Km.
On to the results.
Factory spec on the first compression ring is 0.15mm with a service limit of 0.70mm
All first compression rings all measured exactly the same at..........0.35mm
Factory spec on the second compression ring is 0.35mm with a service limit of 0.70mm
All second compression rings all measured exactly the same at..........0.55mm
With 375000Km old, worn rings, these GS motors never cease to amaze me, UN - FRIKKEN - BELIEVABLE.
Needless to say I am a happy camper today.
I really do not expect any nasty surprises as the tear down continues.
However, being the realist I am, I prepared myself for some scary measurements and worn bits, remember, this motor has done just on 375000Km and never had more than the valve cover off for valve adjustment.
So today I measured the ring end gaps, hoping that if they were not too far past service limit, a fresh set of rings will bring them back into limits and I can avoid a rebore,
Now, in 30 years of riding GS motorcycles, I have seen most of it, and seen it twice again, and like most folk here, have a healthy respect and loads of admiration for the GS series motorcycle, and its bullet proof engineering.
But just when you think you have seen it all, there is always something that blind sides you and leaves you shaking your head in admiration, today was such a day.
First thing I need to make clear is that I measured the ring end gaps with the old rings that came out of the motorcycle, not new rings, yes, the ones that have done 375000Km.
On to the results.
Factory spec on the first compression ring is 0.15mm with a service limit of 0.70mm
All first compression rings all measured exactly the same at..........0.35mm
Factory spec on the second compression ring is 0.35mm with a service limit of 0.70mm
All second compression rings all measured exactly the same at..........0.55mm
With 375000Km old, worn rings, these GS motors never cease to amaze me, UN - FRIKKEN - BELIEVABLE.
Needless to say I am a happy camper today.
I really do not expect any nasty surprises as the tear down continues.
That is simply amazing! How do the piston skirts look? I have a spare set with extremely low Km's on them Justin Case.
F
Flyboy
Guest
Skirts look good, will snap some pics tomorrow, camera's batteries are on charge now.
With ring measurements like those, I suspected they would be in very good nick.
M
Matchless
Guest
Hi Stan,
Followed the notification and opened the page with the cam photos and thought it was from your bike!! Then read the words and see its from your car! I would keep that cam and mount it in the garage, quite a conversation piece!
Is your GS still using standard size pistons?
Followed the notification and opened the page with the cam photos and thought it was from your bike!! Then read the words and see its from your car! I would keep that cam and mount it in the garage, quite a conversation piece!
Is your GS still using standard size pistons?
Good news Stan...
F
Flyboy
Guest
Yep, standard pistons, first time the head has ever been of that motor.
I reckon that cam makes a good traditional weapon.
Good news indeed Scott, the less I need to spend, the better,
I reckon that cam makes a good traditional weapon.
Good news indeed Scott, the less I need to spend, the better,
M
Matt-Indiana
Guest
Wow, great build........read it all at once today
F
Flyboy
Guest
Thanks Matt, we try.
Sorry to be a contrarian, but measuring the bore with a bore gauge is a better way to judge wear. I've measured a number of fairly low mileage GS1000 cylinders (30k miles) and I've always found a fair bit of taper and out of round. Hopefully that won't be the case here of course. Just don't want you to assume too much. Finding a new cylinder, or at least a lowER mileage one is fairly cheap all things considered.
M
Matchless
Guest
Yep, standard pistons, first time the head has ever been of that motor.
I reckon that cam makes a good traditional weapon.
Good news indeed Scott, the less I need to spend, the better,
Stan,
If you contact your local engine part supplier, they have 70mm Uno rings which will fit, just give them the measurements from your manual. I got a set for 4 cyl Hastings rings for about R120 from ours.
Save a few R's!
PS. If you need to rebore and get larger pistons and rings consider re-sleeving to standard size
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F
Flyboy
Guest
Thanks Andre, good to know, will do that, Swambo is in the motor parts game so I get the stuff for next to nothing,
Definitely won't need to bore, that is for sure, will slip a feler gauge in tomorrow and check piston to bore clearence, but I expect it will be in spec.
While we on the subject, Nissan 1400 bakkie brake pads skimmed down to 10mm are a lot cheaper than EBC and a lot better than Emgo's.
Definitely won't need to bore, that is for sure, will slip a feler gauge in tomorrow and check piston to bore clearence, but I expect it will be in spec.
While we on the subject, Nissan 1400 bakkie brake pads skimmed down to 10mm are a lot cheaper than EBC and a lot better than Emgo's.
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