Getting Fuel Injectors Reconditioned

[DRxBMW]

I've always considered wrenching on my old airheads to be quality garage time. Actually, it's a therapy of sorts.   This K-bike is not fun to work on at all.  I like riding it; it handles well, has good smooth power, but I'm not enjoying working on it in the least.  I hope that, once sorted out, I don't have to turn a wrench on it again for a long, long time. If that doesn't prove to be the case, it's not going to be in my garage very long.  :dunno2:

YES, K bikes are different animal wrenching on them.

However, once you've been around the block a few times, it does get easier. 

TB's & injectors are a real pain, especially if they old.

Tranny's are a even bigger pain in ass, just ask Tooothless Grin.

Ha, ever work on a old VW,frustrating as hell. BTDT, when one needed that silly S bent wrench as nothing else has the clearance. Damn Krauts anyway.

Hang in there, things will get better.

[Inge K.]

I want to remove this cover to gain access to the screws that fix the bottom of the airbox to the engine. there isn't room to reach the screws on the bottom with the cover in place.

Someone with smaller hands would perhaps be the correct tool for this job.
Have removed the bottom half of the airfilter housing on several old K`s (also -85`s).
First I`ve loosened the hose clamp at the at the plenum chamber to get the upper half
a bit more moveable.
For both the clamp and the bottom half screws I`ve used a small / short bit ratchet,
it`s a tool that make life much easier when working in this really tight places.

Inge K.

[Lawrence]

My reconditioned injectors were returned and I'll happily add my name to the growing list of Mr. Injector's satisfied customers.  There wasn't much wrong with them; only slight reductions in two from the specified spray/flow rate and apparently none were leaking.  The source of fuel at the base of the no. 1 injector is a mystery, as I haven't discovered any fuel hoses that are suspect.   
After reading the procedure here for the injector reconditioning I ordered new o-rings to seal the plastic connectors between the throttle bodies and the head, as recommended. However, I didn't order  the plastic connectors themselves since I don't see the point of replacing things unnecessarily.  Imagine my surprise when I discovered the OEM plastic connectors have no provision for an o-ring seal!  Now I'm in a quandary. I don't feel good about using the plastic connectors again.  If I were to fail to seal them properly (there is no gasket)  the resulting intake leak would send me over the edge.  Honestly, I'd much rather lube the drive-line splines that dismantle the damned throttle bodies again.  They are a nightmare! 
What a pickle!  Now I'm facing ordering new connectors, which I hope will be designed to use my new genuine BMW o-rings.
The reason I began this maintenance was to be sure my bike was ready for a long ride at the end of this month.  Now it's in pieces and I'm at the mercy of the BMW dealer to deliver the needed parts in short order.   
I've always been a strong proponent of preventive maintenance, but the old line, "if it ain't broke, don't fix it" sounds like very good advice just now.  :confused:

[Inge K.]

What a pickle!  Now I'm facing ordering new connectors, which I hope will be designed to use my new genuine BMW o-rings.

AFAIK o-rings is only used on the 16V and K11, on a 8V the seals is incorporated in the stubs.
Anyhow, it wont be a drawback to change the stubs on a 27 year old bike, then you know what you got.

Inge K.

[frankenduck]

When you send your injectors to Mr. Injector he replaces the O-rings on both ends with new ones so you don't have to pay BMW $5 a piece for generic O-rings.

[Lawrence]

Yep, the injectors are looking good, Mr. Duck.  I'm very pleased with Mr. Injector's work.
It's the connector stubs I am unsure of.  Should they be installed dry? It appears that was what the factory did way back in 1985. If a sealant should be used, I'd be interested in recommendations.  Non-hardening Permatex gasket maker (the gooey black stuff)? Dirko? Something else?
I intend to order new stubs as you suggest Inge, but if they don't arrive in time for my Spring ride I will install the old ones and hope for the best.

[frankenduck]

What's a "connector stub?"

[Inge K.]

What's a "connector stub?"

In this thread, I`ll guess it would be similar to a "intake stub".

Inge K.

[Lawrence]

My intention was to refer to the molded plastic part that connects the intake track of the head to the throttle body.  BMW incorrectly translates this part as a manifold, which of course it is not.  However I should have just used their word for it to avoid confusion,  and to be consistent with the parts fiche.  Mea culpa.
I have caused myself a bit of unnecessary grief with this maintenance by failing to note the differences between the 1985 K100RS and later models.  I believe BMW modified the bikes more than I had imagined. I  read explanations of work on the later 4-valve models and thought I could do the same on my '85.  This has been an education! 
Thanks for your patience with my stupid questions and frustrations.

[frankenduck]

When all else fails, use part numbers.  :2thumbup:

One of my favorites is that they refer to the dash pad holding the switches on the upper fork tree as a "hub cap." 

I think BMW did many of their translations during Oktoberfest.

[pallum]

I had a hell of a time getting mine out, had to pull each one separately after removing the fuel rail.




Cleaned up as best I could before pulling, all that wetness is WD-40 which in hindsight might have helped keep the crud from breaking loose and falling into the head

After:



Feels like it runs smoother, so money well spent.