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Discussion Starter #1 (Edited)
Just got her, pulled the plastic off to check air filter, found about 300$ in cracked rubber, glad I didn't ride it 100 miles before I checked... anyone got thoughts on replacing injector o rings while im at it?
 

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Wow! Am I correct in assuming it didn't run will all those rotted intake manifolds and lines? Oh well, rubber bits don't last forever. How many miles on the bike?
 

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Discussion Starter #3
It had old fuel in it, had just a little miss. It has 20360 miles on it. Think it was parked for 2 years...
 

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It had old fuel in it, had just a little miss. It has 20360 miles on it. Think it was parked for 2 years...
Everything shown in your earlier photos is pretty common if / when these rubber components related to intake / fuel systems have more than 10 years since new. The only abnormal damage is on the 4-into-1 breather vent tube (between crankcase and Throttle-bodies) - clearly someone has pulled on the TB before removing the tube clamp at crankcase - this part will crack over time but NOT the way your photo show.

The usage of Ethanol in fuel in North-America has made this wear issue of rubber / plastic parts always in contact with fuels even worse than in 1970 or 1980 era. Of course, the damage of Ethanol is even more visible on an inactive vehicle with stagnant / stale fuel.

I am currently working on a 2001 K1200RS (with 34,000 miles) that was parked for 4 years - it was bought by a friend that does not work / fix his own motorcycles... When he bought it used 4 years ago, it was not planned that it would stay parked for so long, but a series of unforeseen circumstances have delayed the import of the bike back to his home.

Given 15 years experience with aging rubber components on these K1200RS/LT (intake and fuel systems), I am just replacing everything suspect. Even the injectors where tested (1 jammed and 1 dead) - hence all injectors O-RING were also replaced (top and bottom). The fuel system was tested with a fuel pressure gauge to confirm no internal / external leaks AND a good / functioning fuel pressure regulator.

Of course, the fuel filter was changed and also the 2 hoses connected to it - these short hoses under constant pressure tend to crack after 10 to 12 years of age on average (see last photo...).
 

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For an 18 year old bike with 34,000 miles that engine looks pretty spotless. You already clean it as part of the re-fresh? I see nice metal fuel line disconnects too...so somebody cares!
 

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Discussion Starter #6
Thanks for your thoughts on the situation, I'll pull the injectors and replace o rings. Replacing all rubber, fuel filter and vacuums line, it's all junk. Hopefully have it running by end of the week. Mail man is going to be pissed...
 

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Thanks for your thoughts on the situation, I'll pull the injectors and replace o rings. Replacing all rubber, fuel filter and vacuums line, it's all junk. Hopefully have it running by end of the week. Mail man is going to be pissed...
I forgot to also mention this in my earlier post:
The surface under manifolds (touching cylinder head) will sometimes become dirty with some form of corrosion (creating intake air-leak). While you are there, It is advisable to remove these 4 manifolds, cleanup surface and change the 4 O-RINGs.

In the past, with age / mileage / heat-cycles, we have also found these 4 black hard plastic manifold to become warped and create intake air-leaks. It is suggested to check bottom surface for flatness and correct if needed. The metal inserts for the bolts (2 per manifolds) do stick out a bit too much by design and make matter worse.

Four Manifolds rubber sleeve: Part #5 in this diagram (goes between engine cylinder-head and throttle-bodies)
https://shop.maxbmw.com/fiche/DiagramsMain.aspx?vid=51719&diagram=11_1887&partnumber=11611464820

With the above, you should also replace the 4 O-RINGSs below manifolds (item #3 in same diagram).
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replace all the rubbers, as it looks like it has been sitting a while and they deteriorate pretty quickly. Easier to do it once than have to get back in there again after a few miles.
 
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