Saved a brick today!

[jakgieger]

Me, too.

How do you intellectually conceptualize the fact that this great country apparently prefers UUGGGE A##holes? Electorally speaking of course...

[Laitch]

How do you intellectually conceptualize the fact that this great country apparently prefers UUGGGE A##holes? Electorally speaking of course...

In response to whatever you mean—typographically or otherwise, jack, I say that we must embrace our similarities even if they are just hole sizes. If I get your drift, certainly the preference should be that those holes are smaller, too.


Now, back to the subject of the thread, because I know you have an abhorrence of hijacking. :giggles

[jakgieger]

Now, back to the subject of the thread, because I know you have an abhorrence of hijacking. :giggles

Well said.  K_grendell sorry for the diversions(enjoyable as they are on a COLD December day).  All the talk of variances in orifice size/quantity got me excited :hehehe .  I personally think that the injectors are an improvement.  But opinions are like Aholes, everybody has one!It sounds like you have the issues well in hand.  After servicing, you can start on upgrades(alternator, led lights, etc)!  Good luck

[The Mighty Gryphon]

I guess I am still burdened by the memories of the years I spent traveling around the country as a hydraulic tech cleaning sh!t out of the small holes in hydraulic servo systems.

The rule of thumb was that the likelihood of clogging a hole increased as the inverse of the square of the diameter change.  The smaller the hole the harder it is to filter out the bad stuff that could clog it.

The pessimist in me expects the injectors to clog.  Why make it easier for them?

[jakgieger]

The pessimist in me expects the injectors to clog.  Why make it easier for them?

I work with/depend upon hydraulics daily Gryphon.  I appreciate your concerns.  That being said, the forces, thermal differences, filtering specs, and mechanical complexities in hydraulic applications are grossly different.  No need to fear 4-hole injectors (85 million cars can't be wrong), unless you are adverse to filter changes or regularly/intentionally add impurities in your gasoline .  I regularly practice rapid acceleration in an attempt to purge impurities and keep fresh fuel in my bike :2thumbup: .

[Laitch]

. . . (85 million cars can't be wrong), . . .

The combustion of K-bikes was designed with two-hole injectors in mind. Introducing a differing component can also introduce the need to modify settings for optimal performance. If the cost of two-holers compared with four-holers is the same but the acceleration performance is significantly improved, then that's a reasonable rationale for purchasing the fours—if speed is the need.

I think if the throttle is twisted far enough for long enough on K-bikes with two-holers, there should be enough speed produced to overtake effectively, to garner traffic violations abundantly, to maim reliably, or to arrive predictably ahead of schedule in most cases.
 :yippee:

[K_grendell]

First ride report...holy shit this bike is really tight and in better shape than I expected! The wind protection is also pretty awesome.

I did a fluid flush, new rear master reservoir, fresh coolant level line hose, new battery, and a proper detail and re-assembly. I'm very impressed with how smooth the bike is! I will definitely be selling my touring ducati next season and replace it with the k-bike.

I am looking forward to sorting out the few niggles and some minor upgrades.

There a slight hesitation when you snap he throttle, is this standard fare for the old jetronic injection or should I delve into a full on t.b. Sync etc...?

[Laitch]

There a slight hesitation when you snap he throttle, is this standard fare for the old jetronic injection or should I delve into a full on t.b. Sync

Full valve clearance check/adjustment then tb synch.

[Chaos]

When the dealer was checking me out on my brand new 75S 30 years and 3 months ago,  he whacked the throttle open for a second and the engine gasped a bit before it revved up.  That, he said, is normal.  Mine's always done it, almost unnoticeable in regular driving.  I'd certainly check the valves and a sync couldn't hurt anything, (185k now and I've never touched my tb's) but if you're chasing a slight hesitation when you suddenly give it a bunch of gas you might be chasing your tail. 

[Elipten]

Agree some hesitation off idle.  Always been there for 26 yrs on mine since new.

I do believe this is the first mass produced EFI motorcycle.


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[Martin]

Do not adjust the throttle body  mechanical adjustment screws ( The ones with the blue paint). If moved it is extremely hard to synchronize them again.
Regards Martin.

[K_grendell]

That is what I was assuming, my old cis injection vw's were similar.


The way you worded it as gasping when you open the the throttle is exactly what it does. It was really bad at first but the longer it warmed it and more I used it the better the bike got. From sitting all those years I'm sure it was just slow to wake up. I'll focus my attention elsewhere for now until I start putting miles on it next spring to shake it down.


I'm going to tackle the brake system next, lines and m/c & caliper rebuilds. Any recomemdations for where to source oem seal kits? Has anyone swapped over from squishy rubbber to steel lines?

[Elipten]

I bought caliper rebuild kit years ago at Beemer Bonerard years ago. And went SS on lines. Many sources for those including local shops can build


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[Elipten]

My K takes some time to warm up and the the delay and stutter off idle is greatly reduced


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[The Mighty Gryphon]

Both of my K75's with Jetronic systems hesitate when the throttle is snapped open from idle.  I suspect it has something to do with the barn door in the MAF which is going to induce a momentary vacuum surge in the intake manifold prior to opening and allowing the air to flow. 

My K100 with Motronic is much crisper and responds almost instantly.  It has no MAF, but rather meters fuel based on throttle position.

I have not had any problems with the k75 hesitation since I have the habit of rolling on the throttle rather than snapping it on and off.

[Chaos]

I'm going to tackle the brake system next, lines and m/c & caliper rebuilds. Any recomemdations for where to source oem seal kits? Has anyone swapped over from squishy rubbber to steel lines?

Speigler makes nice SS brake lines.  BBY is an excellent source of many parts, unfortunately...

[Filmcamera]

I just found a complete set of six Spiegler hoses for my 1991 K100RS 16V ABS 1 for less than the cost of buying OEM so they are on my Christmas wish list for sure.


http://www.sportbiketrackgear.com/spiegler-bmw-k75-85-92-rear-brake-line-kit-orig/


That is for the back brake of yours but I bet they have the front as well

[kris]

My bike mechanic looked at my 30 year old brake lines and gave them the thumbs up. They work just fine and are in great condition. Stainless lines would be a spanky new look if the budget and will are there but, imho, would be unnecessary...assuming your lines look as good as mine.

[K_grendell]

Kris, I ride a lot of miles and have had too many close calls in my younger years. I've learned not to trust old rubber tires and brake lines, I've had them collapse internally and stay locked on, break down after a few weeks of use after long term sitting and leak/rupture, and make a mess of good paint. With my riding style brakes and tires are something I don't take chances with.

[Chaos]

One thing I've never worried about are the radiator hoses.  Mine are original and I don't think I've ever heard of one failing.  (sure somebody will chime in here with a burst hose)  :eek:

[Martin]

All my 1992 radiator hoses are original. Front brake hose failed 15 years ago developed a air leak, it was sucking in air but not leaking fluid weird. I still have it as a curiosity, I assume the leak was caused by a flap of rubber acting as a one way valve.
Regards Martin,

[kris]

K-grendell,
You make an excellent point. The question really has to be, "Is it worth the risk?" and the only sensible answer is, "No".  I am not an aggressive rider....easier on my machines. But it's not worth finding out, in a pinch, that the lines wouldn't take a handful of really hard squeeze. I may re-think my position. I don't need stainless but newer lines wouldn't be an unreasonable preventive maintenance item! Now that the first significant snow has fallen we can sit back and survey the fleet. I was riding on Saturday and will ride again once these roads dry up!!

[John Lang]

Check out https://www.motobins.co.uk for after-market stainless braided brake lines and re-build kits.

[Filmcamera]

I just brought a full set of Spiegler SS lines for my 1991 RS 16v ABS for $205 inc shipping.  That is for six lines, works out cheaper than BMW ones.


I got them here..


http://http://www.sportbiketrackgear.com/

[Scud]

I got Spieglers for my K75s. Excellent quality and perfect fit. Unfortunately in my case, when I got them I discovered that the PO had made some modifications and that I did not have all the stock components to attach my new to. I discovered this while complaining to Spiegler that the hoses were too short - and they graciously pointed out how they were correct and that I was missing some hard lines. If your bike is unmodified, you should be fine. I'm happy with mine, now that I acquired the missing components.