I plan on tearing it down soon, hopefully the inside inside isn't too bad.
Why are you tearing it down—low compression values or what?
I figured tearing the bike down for a nice cleanup, wash off the surface rust and have parts repainted so the bike does look like it was driven by someone in the Mad Max movies. lol. That, and see if theres any maintenance needed inside the engine block itself. Maybe replace many of the seals, gaskets, etc etc. hardcore maintenance stuff.
I am with Tim Tyler. Part it out. I had a 85 that I worked over, but it was running, good, no smoke, gas tank good. Spent $2K getting it back to good shape, not pristine by any means, just reliable. You will spend a lot of money on that thing and you can buy them in PNW for $100-$2500 in great running shape. Cut your loses. Just my Opinion.
I hear ya on that. Thing is, i got this bike for free. My buddy went and had a family and kids so the bike was neglected, so now its in my hands. It was reliable when he used it nearly daily. I'm fine with dumping a little bit of money into it since i inherited it, and it gives me a side project to tinker with. By no means do i think i'll be able to tour across the country with it (unless i really get into all the innards.) All else fails and the motor is trash, it looks like i can procure new ones on ebay for about $200 with 40k or so miles.
Looks like it came out of a swamp. And on this basis be careful what you clean - if you want to keep THAT look.
I hope you changed the oil. False economy not to.
The pinging maybe the antibacklash spring but let the bike get to operating temp first. It is not a small job. Turning the silver idle screw (yeah the one with blue loctite on it) to increase revs to approx 1000 or 1100 may lessen the noise (record how many turns you did for later). I saw someone with a microphone go round the motor and measure the noisiest section (ie output shaft behind alternator) which is best method I have seen.
The whine is normal.
Best to flush the tank. Once dry, I vacuumed mine to remove grit. replace fuel filter - doesn't need to be BMW brand. Check this forum for alternative BMW parts.
Clean and gap plugs (0.6 - 0.7mm), check the fuel lines for cracks and replace (inside tank needs submersible hose not standard fuel hose). The fuel in under pressure - don't want any leaks and fires. Check and clean air filter (mark the outside edge and top before removing. Easily put back in wrong).
Allow to get to operating temp and check that fan comes on. The bearing in these is a bush I believe and can go bad. Haven't had mine out.
injectors are probably dirty but check you can check the spray from each by removing the FI rack and keep injectors in place. This is not accurate. Also check on youtube for others' suggestions. Caution: injectors may be hard to get out. Clean the area around them. Crud will build up around body and may significantly hinder removal. Some spray might help (WD 40 et.al) but don't then let it fall into cylinders. Use a air compressor to clear beforehand. Vice grips (or similar) can be used to grab the metal body (quite robust) as I had to on number 1 injector. O-ring and pintle cap may be damaged and require servicing ... see post on 4 hole pintle on this forum.
Anyway your bike seems to be firing on all cylinders ... maybe leave well enough along for the next week. Just change that oil. And don't rev the shit out of it (up and down up and down) when cold - build the revs gradually and give it a chance to settle and come up to temp. Once the fan comes on then rev it if you must. As we all know motors don't mind being used - just not abused. And this is the huge appeal of K bikes - that quality motor. Look after it.
A manometer is a useful item for balancing throttles - assuming all else is fine... unlikely because rubber hardens as it ages (dehydration??) and air-tight seal is accordingly compromised.
You might have fluked a bike that under the dried green slime / residue might be quite roadworthy (something we are all unlikely to agree on - 'cept that it needs to be safe)
Keep the pics coming
Regards
Guy
I don't think im going to go for a nasty new orleans swamp monster look. I think after i get it working well I'll get it painted a nice clean white, with a powder coated frame black so it looks very fresh and BMW-esque. I may pull off the front end and turn it into a naked k100 standard, or go up to an RS. Leaning towards the naked bike as far as look.
I didnt change the oil when i got it cranked, so i only let it run for a few minutes. I full plan on draining all fluids and replacing before leaving it running for any extended time that will allow the whole block to warm up.
Hopefully in a few weeks I'll get around to cleaning the hell out of it. I'm not entirely sold on getting into the motor itself for advanced maintenance, but i know it may have to be done. I definitely want to do the basic stuff though. And i've got a local BMW moto shop that is very popular (not dealership) who said they'll clean up my injectors. They'd definitely have the capability to deal with that more than i would.
I also noticed today that the front brake lever is essentially shot. no feedback at all, so ill probably be cleaning up some brake parts soon.
Thanks for all your help guys, its definitely much appreciated. can't wait to run this brick on the road again. It's been a while since i have.
