K100RS parked for four months outside in all weathers

[Elipten]

Consider a low seat?  I find my RT to be top heavy compared to my Honda


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[Filmcamera]

I already have one - the bike is great at anything over 3 mph - but less than that it is a real handful if it starts to go. 

[Filmcamera]

The problem with the driveway is it is a 1 in 3 slope. more or less, combined with a 180 degree corner over 12 ft and it is part of the run off for the rainwater coming off the mountain.  That means that it gets lots of moss and algae growing on it.  It is more or less ok if if I stick to the tracks left by the cars but today I was slightly off line and it is like ice.  My bad.  Life in the tropics...

[Laitch]

Life in the tropics...

What brand and model of tire are you using?

[Filmcamera]

Continentals -
Contiforce 160/60/ZR18 rear
Contimotion 120/60ZR17 front

both in good condition but of unknown age, maybe four years max

[Filmcamera]

Some of us suspect you did it on purpose just to have an excuse to extend this endless thread :riding:

Busted! For my next trick I plan to try high siding.. or maybe I should just go cafe racer  :yow

[Filmcamera]

It seems something more than I suspected happened when the bike dropped.

I took it for a quick spin today and it was running really rough. It backfired often as soon as I rolled off the throttle even at low rpm's.  It hesitated and misfired when under gas and generally felt like it had no power.

Given  was going 0 mph when the drop happened the only thing I can think of is that some oil or something got somewhere it shouldn't be when the bike was on its side. Some transmission fluid did leak out of the top of the transmission for example. Is that normal when a K bike is dropped?

I am working now so I can't really tear it down too much but when I have time is there anything specific I should be looking for?  I did try searching running rough after a fall but didn't find anything specifically about after a fall just lots of general threads about rough running.

[Laitch]

I should be looking for? 

Check all your spark plug caps to verify they are fitting tightly to the plugs.

[Laitch]

In fact, check all your electrical plug connections.  :yes

[Filmcamera]

OK I will do that, thanks,

[Laitch]

And your crankcase breather hose connection, too.

[The Dude]

I took it for a quick spin today and it was running really rough. It backfired often as soon as I rolled off the throttle even at low rpm's.  It hesitated and misfired when under gas and generally felt like it had no power.

Similar symptoms er happened to me.Awe feck it,now I'm doing it.
Factoids:
Took green goddess out into sun for a rinse and wipe before start procedure.
Key on,Idler lever full wack,clutch in(for less churning,less amps and less effing chance of the relay weld up after a while sitting less than two weeks),silent prayer,dab on the button.Brmmmm,sweet.
Full saftey gear on,fuck around with sunnies,get leg over,drop glove on the gorund just pick it up without falling off and vroom up the slope and fut, chug and splutter back to the sweetest idle.WTF!
Eh,the little sprung vac hose is off its nipple.
Ayy?Ah yes, perished.
Trimmed,gentle suck and tongue seal test for a couple a seconds,then push it on and off we go.
It was better.
Er,,,only just,splutter bog down all from idle upto 4500rpm but from then on we got rocket to the moon pulling as clean as.Oh well,I got my yeehaa.
 
Has yours got what mine's got,Filmcamera,or is it the other way round?This may be crucial in my approach for a solution.
 
 My fix,currently,will be to fiddle with the Guzzi, whispering sweet nothings in full view of the Brick.Cerimonioulsly transfer the ex lawn mower battery over and ride that(the bike)whilst I pontificate my next BMW parts purchases and procedures and the sheep mow the grass...Make sure you let us know what you did,Filmcamera,I'm feeling lazy.

I got my Triumph hat on at the mo and this has dumbed me down somewhat in my technological conundruming ability,going back to the 'fifties(for a seventies bike)does that to me and I love it.A simpler world.All that future techno stuff,oh well.Luck and serendipity can only take me so far,though,I'll be needing my Brick back sometime soon.

[Filmcamera]

That does sound similar yes.  Though mine sometimes didn't even want to idle and then every now and then woosh off it went as happy as Larry and revving sweeter. So far I have checked the spark plug connections which were fine and the coil end where one did seem loose.  All other connections I tested seemed fine.  So tomorrow I am going to go for another spin and see how it feels now.  Bloody rain gets me down at this time of year.  Yeah yeah I know you can ride bikes in the rain (back in blighty I was a 365 day a year rider)  but believe me in CR at this time of year it is more like riding underwater and so not the best conditions for a test ride.

[Filmcamera]

Nice weather for ducks!

This is a daily occurrence at this time of year

[bmwpyro]

looks like where I'm from, flash rain, flash floods. I miss the rain...

[Filmcamera]

I went out for a quick spin this morning and the bike feels much better.  I think the loose coil connection was the issue, thanks Laitch, good call!

[The Dude]

I went out for a quick spin this morning and the bike feels much better.  I think the loose coil connection was the issue, thanks Laitch, good call!

Sweet!

[Filmcamera]

I checked the valve clearances yesterday.   So much for Chris Harris saying the valves don't get tight on a 16v - it seems they do, after 125,000+ miles at least.

I am not sure what to do now, live with it for the moment I think.  I do not know of a good mechanic here to try and replace the buckets and yes that includes the BMW dealer.  I don't feel up to the job myself yet. So I will check again next year and see how they are doing.

I also attempted to balance the throttle bodies and discovered I have a pretty big vacuum leak on the number two cylinder.  When I had the carb tune pro attached the vacuum tube hardly registered at all but if I pressed down on the air intake it started to show up. I am thinking that is a leak.  Time to order some bushings and intake manifolds.  I would be interested to get a report on the new injectors some people have ordered, it seems this might be the time to do that as well.

Valve clearances attached in case anyone is interested

Valve clearance chart.docx (14.09 kB - downloaded 271 times)

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[riots100]

I do not know of a good mechanic here to try and replace the buckets and yes that includes the BMW dealer.  I don't feel up to the job myself yet

Do the buckets need replacing?  Generally you would replace the valve shims that ride on top of the buckets.  Replacing valve shims isn't hard with the right tool.  To replace the buckets you will need to remove the camshafts.  Putting it back together requires attention to detail, but certainly not beyond your abilities considering everything that you've already done to this bike.

(and as a film cameraman, you should know better than to post vertical phone video... :nono )

[Laitch]

Do the buckets need replacing?  Generally you would replace the valve shims that ride on top of the buckets.

The four-valve engines are different animals from the two-valve, riots. They don't have shim-and-bucket adjustment. They just have inverted buckets; the cam pushes on the bottom of the bucket. Instead of replacing shims, you replace buckets to the tune of 28–35USD each from the dealer. The camshafts must be removed to replace the buckets. Fun, huh? I'm starting to understand and appreciate the differences.

4v cam follower. Diagram from MAXBMW parts fiche.png (48.05 kB . 510x360 - viewed 518 times)

Like you say though, Filmcamera is up to the task.
 

[Filmcamera]

I hope I am and thanks for the vote of confidence. 

The real pain is there is no way of knowing what size buckets you need until you have taken the old ones out to measure them so you can order ones 0.05 mm or whatever shorter.  In my case that means the bike would be off the road for at least three weeks waiting for the new buckets to wend their way here. Since I had 10 out of 16 valves out of spec that is a lot of buckets!

First priority is the vacuum leak, then at least the bike will run and ride ok whilst I get together the cash for the buckets.

Riding it is after all what I want to be doing, at this time of year that is what weekend mornings are made for!

[Laitch]

In my case that means the bike would be off the road for at least three weeks waiting for the new buckets to wend their way here. Since I had 10 out of 16 valves out of spec that is a lot of buckets!

Tight? Loose? Exhaust? Intake? You're killing us with suspense. I'd get a different feeler gauge and measure them again. The humidity might be affecting your vision.

[Filmcamera]

Oh sorry, I posted the chart in the earlier.

Anyway all the valves out of spec were tight, six of the intakes and four of the exhausts.  Not crazy tight except for cylinder one both intakes which was a go with o.10mm but no go with 0.13mm with the spec range being 0.15 mm to 0.020 mm.  The rest of the intakes were go with 0.13 mm and no go with 0.15 mm. Finally cylinder 3 was go with 0.15 and no go with 0.18 for both

Of the exhausts both valves on cylinders one and two were go with 0.23 mm no go with 0.25 with the spec range being 0.25 mm to -.30 mm, the others were fine 0.28 go 0.30 no go and 0.25 go 0.28 no go

[Laitch]

I posted the chart in the earlier. . .
Anyway all the valves out of spec were tight, six of the intakes and four of the exhausts.

I overlooked the chart. Thanks for the spec review. It's probably good for both you and the bike that you looked in on them. I'd still check them with a different gauge—applied magical thinking sometimes works. :giggles

There's always GoFundMe. The narrative should go something like I'm stuck in Costa Rica during the rainy season and the friend who's staying with me needs an operation. Her valves might give out soon without it.

[Filmcamera]

That beats the normal scam they run down here

Hi congratulations you have won the lottery for $2 million, all you need to do is send $2,000 to cover the state tax and we will send you the $2 million...

Either that or timeshares, coffee businesses or gold options - it is something of a haven for US ex pats selling fake deals over the phone.

The main hurdle I need to overcome is the minister of finance, she who must be obeyed, I get very stern looks every time I come home with a box marked MaxBMW...  :hehehe