Search found 554 matches

by PhilO
Sun Feb 18, 2018 10:26 am
Forum: Airhead Q&A's
Topic: Airhead values
Replies: 31
Views: 499

Re: Airhead values

Asking price is not the selling price.
There must be a medical term for people like us who spend a lot of time just gazing at their airheads.
Suggestions please.
Mine would be 'Bikepolar disorder'
by PhilO
Sat Feb 17, 2018 6:31 pm
Forum: Airhead Q&A's
Topic: Airhead values
Replies: 31
Views: 499

Re: Airhead values

The enjoyment I get from riding my old clunkers is priceless
by PhilO
Fri Feb 16, 2018 9:32 pm
Forum: Airhead Q&A's
Topic: Airhead values
Replies: 31
Views: 499

Re: Airhead values

An wise friend told me that even if I got an old bike for free I'd still paid too much for it. He knew how much it was going to cost to do a proper job on it and it would never sell on for the cost or restoration. An object is worth what anyone is prepared to pay for it. The problem is finding the r...
by PhilO
Thu Feb 15, 2018 11:56 pm
Forum: Airhead Q&A's
Topic: Left pot miss fire back fire
Replies: 53
Views: 2491

Re: Left pot miss fire back fire

If there is a backfire through the carb then either there is a mis-timed spark or the inlet valve is not seating correctly. If the spark was mis-timed it would blow both carbs off so we can assume the problem is the valve. Do you have a broken valve spring? Is the rocker bearing sound and the rocker...
by PhilO
Thu Feb 15, 2018 11:38 pm
Forum: Airhead Q&A's
Topic: POLISH Crankshaft
Replies: 51
Views: 1051

Re: POLISH Crankshaft

I'm thinking that the start-up procedure for a racing engine is dictated by the cam shaft which will not permit ticking over at low revs and consequently much reving and throttle blipping is required. The cam lobes suffer at low revs too. There is probably so much ignition advance that ticking over ...
by PhilO
Thu Feb 15, 2018 5:21 pm
Forum: Airhead Q&A's
Topic: POLISH Crankshaft
Replies: 51
Views: 1051

Re: POLISH Crankshaft

Brian, you seem to be a bit of a tribologist so can you say what class of finish we should aim for (you can quote microns if you like) and how we can obtain it? i.e what grade of emery will do the job. I would have thought the oil would cling to a mirror finish through its natural wetting properties...
by PhilO
Thu Feb 15, 2018 12:08 am
Forum: Airhead Q&A's
Topic: POLISH Crankshaft
Replies: 51
Views: 1051

Re: POLISH Crankshaft

Wow! that's a good finish.
Did you do a before and after measurement of the diameter? It would be interesting to know.
I would have wrapped the boot lace round enough turns to fill the journal then the pressure would be spread more evenly but the leather probably spread the pressure anyway.
by PhilO
Thu Feb 08, 2018 10:45 pm
Forum: Airhead Q&A's
Topic: Brake lever bending
Replies: 22
Views: 403

Re: Brake lever bending

Your alloy brake pedal will probably be made from forged aircraft spec aluminium. Mazak or pot metal would snap like a carot the first time it was used. They actually have a grain structure which I have seen with my own eyes on a very salt corroded example. At a stretch it could be a heat treated di...
by PhilO
Mon Feb 05, 2018 11:35 pm
Forum: Airhead Q&A's
Topic: GS sump guard mounting
Replies: 23
Views: 515

Re: GS sump guard mounting

Relocation is a good idea. I'll look out for a kit.
by PhilO
Mon Feb 05, 2018 3:43 pm
Forum: Airhead Q&A's
Topic: GS sump guard mounting
Replies: 23
Views: 515

Re: GS sump guard mounting

Andy, I'm a great believer in lucky charms. My take on the bypass gizmo is if I have the misfortune to damage the oil cooler, either by dropping the bike or a stone impact then my Alpine tour would not be ended. A litre of engine oil is far easier to come by than a new oil cooler or hoze in the midd...
by PhilO
Fri Feb 02, 2018 5:25 pm
Forum: Airhead Q&A's
Topic: GS sump guard mounting
Replies: 23
Views: 515

Re: GS sump guard mounting

Very interesting but a bit o.t.t.t. GS exhaust would be too tight though. Nowt really wrong with standard filtering arrangement I.m.h.o. This setup intended for Brit. Classics with negligible filtration. I'd be a little concerned about excessive pressure when cold and dry bearings on start-up.
by PhilO
Fri Feb 02, 2018 11:19 am
Forum: Airhead Q&A's
Topic: GS sump guard mounting
Replies: 23
Views: 515

Re: GS sump guard mounting

Fair point well made. The device I have made connects the two ports in the cover plate with an 8mm passage so I think that will cope nicely when one considers that the pipes it replaces have a bore of 6mm. BTW, I've just made a Mk2 by pass by silver soldering two steel banjos together. Much quicker ...
by PhilO
Fri Jan 26, 2018 9:46 pm
Forum: Airhead Q&A's
Topic: POLISH Crankshaft
Replies: 51
Views: 1051

Re: POLISH Crankshaft

That's exactly what I was thinking.
by PhilO
Fri Jan 26, 2018 11:18 am
Forum: Airhead Q&A's
Topic: POLISH Crankshaft
Replies: 51
Views: 1051

Re: POLISH Crankshaft

I think we are all chucking in our pet theories here, (and I include myself in this statement). Is there a proper engineer /engine builder out there who can give us chapter and verse on this vexed question?
If you can pass the credibility test then let's hear from you.
Cheers,
PhilO
by PhilO
Fri Jan 26, 2018 12:13 am
Forum: Airhead Q&A's
Topic: POLISH Crankshaft
Replies: 51
Views: 1051

Re: POLISH Crankshaft

It would be interesting to ask the bearing seller's view on this issue. Could it be that some cranks are under size when they are factory fresh so perhaps these under size shells are meant to cater for these 'freak' engines? It would save having to bin an expensive component on the production line. ...
by PhilO
Wed Jan 24, 2018 10:16 pm
Forum: Airhead Q&A's
Topic: GS sump guard mounting
Replies: 23
Views: 515

Re: GS sump guard mounting

Hi Andy, Thanks for the offer. I did consider your mod. but I have decided to keep the cooler and use a blanking plate when it gets a bit chilly. I'm going to carry a bypass link in case I ever trash the cooler. I've just made the darn thing. Oh, the joy of having a lathe.......and nowt better to do...
by PhilO
Wed Jan 24, 2018 12:39 pm
Forum: Airhead Q&A's
Topic: GS sump guard mounting
Replies: 23
Views: 515

Re: GS sump guard mounting

Fair point Roy. It looks like opinions are, as ever, divided. My final decision (at the moment) is to rebuild as she left the factory and make an easily detachable cover for the cooler and carry an emergency repair bypass block thingie. The deeper sump seems a sensible way forward for the desert rac...
by PhilO
Wed Jan 24, 2018 12:26 am
Forum: Airhead Q&A's
Topic: GS sump guard mounting
Replies: 23
Views: 515

Re: GS sump guard mounting

Hi Andy, I was thinking of removing the lines altogether and joining the two ports with a hollow link held on with the original banjo bolts. Now that I have googled it I see Motorad Israel do exactly what I want but the usual dealers in the UK don't stock it. I do not want to change the internals if...
by PhilO
Tue Jan 23, 2018 10:11 pm
Forum: Airhead Q&A's
Topic: GS sump guard mounting
Replies: 23
Views: 515

Re: GS sump guard mounting

That's exactly what I thought. Rather than changing the architecture of the oil system I am going to make a 'Banjo bridge' which simply joins the outlet banjo to the inlet banjo. It's the kind of thing anyone with an oil cooler should carry in case the cooler gets a stone through it or they drop the...
by PhilO
Tue Jan 23, 2018 10:15 am
Forum: Airhead Q&A's
Topic: GS sump guard mounting
Replies: 23
Views: 515

Re: GS sump guard mounting

Thanks Roy, for your words of wisdom. On balance I think I'll not fit it since any off-roading I do will be unplanned and in to a roadside ditch. Incidentally, what's the service life of the flexible hoses on the cooler? Do they have a history of breaking down internally? They are 'getting on a bit'...
by PhilO
Sun Jan 21, 2018 5:32 pm
Forum: Airhead Q&A's
Topic: GS sump guard mounting
Replies: 23
Views: 515

Re: GS sump guard mounting

Hi John, Yes, I have a cooler for the oil which lives on the right side crash bar. It is far too efficient so BMW recommend that a blanking cover be fitted in cold weather. Never seen one myself but that doesn't mean they don't exist. They warn too about keeping the revs down whilst observing a warm...
by PhilO
Sun Jan 21, 2018 2:05 pm
Forum: Airhead Q&A's
Topic: GS sump guard mounting
Replies: 23
Views: 515

GS sump guard mounting

The boxes of bits that I aquired a year ago is starting to resemble a very tidy 1988 R100GS. Usually the OEM parts site has been able to confirm what goes where but I have a problem with the mounting of the 'cheese grater' sump guard that fastens to the sump pan with 4 bolts. The OEM diag. shows a '...
by PhilO
Fri Jan 19, 2018 2:03 pm
Forum: Airhead Q&A's
Topic: POLISH Crankshaft
Replies: 51
Views: 1051

Re: POLISH Crankshaft

Rob, you have confirmed what I learned from my enquiries about a re-grind years ago. There are lots of good second hand cranks out there so why take risks with a re-grind? Also the bob weight rivets are unobtainable so you are going to struggle there. There is just so much labour and parts expense i...
by PhilO
Wed Jan 17, 2018 1:00 am
Forum: Airhead Q&A's
Topic: POLISH Crankshaft
Replies: 51
Views: 1051

Re: POLISH Crankshaft

Regrinding a crank means removing the bob weights and re-riveting them back on. I don't think the rivets are available and they have to be specially made. Just imagine if one came lose! I suspect the lapping compounds Kieth has found is for the old fashioned white metal bearings which had to be scra...
by PhilO
Tue Jan 16, 2018 1:31 am
Forum: Airhead Q&A's
Topic: POLISH Crankshaft
Replies: 51
Views: 1051

Re: POLISH Crankshaft

The crank will not get embeded with emery. It is too hard for that. If you are worried then use part worn emery sheet/cloth/wet or dry. This is how they are finished at the factory. Check out crankshaft grinding on UTube and see the sparks flying when they do the final linishing. The act of polishin...

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