Yamaha Thundercats
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Post  alext Fri May 13 2011, 15:06

I've just picked up a cheap old BMW k100 of ebay as Ive got 5 weeks off in the summer and Im planning on riding around Europe.

I rode it 200 miles home and it chugs along nicely, no nasty rattles or bangs, but it makes a weird hissing noise, which sounds like its coming from the tank. Apparently its a common problem on these bikes, is it something I should be worried about and look at fixing, or can I just ignore it?!?
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Post  firemaster Fri May 13 2011, 16:01

you have a cobra in the tank take it to the nearest zoo to get it extracted lol2
aint got a clue ponder
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Post  ellie Fri May 13 2011, 16:27

Don't know if this link is of any use at all?.....

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Post  alext Fri May 13 2011, 16:55

I think its a thirsty Cobra, I only got 150 miles before the petrol light came on!!
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Post  0ldcat Fri May 13 2011, 19:28

Ah Ha ! . . . There you go then yer tank has a slow puncture that's the hissssssss and why so few miles to light on ! green smile lachen











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Post  kwakkat Fri May 13 2011, 19:35

could be when using petrol air going inoto the tank my kwak hisser,s & soon as i open the cap you hear it pop as air rushs in try it & see
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Post  alext Mon May 16 2011, 12:22

I tried opening the cap but the cobra/puncture is still there! Someone told me it might be a blocked breather pipe, I've booked it in for a service on pay day so I'll get them to have a look. Its still chugging along nicely so I'm not to worried at the mo!
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Post  SteveCat Mon May 16 2011, 12:33

alext wrote: Someone told me it might be a blocked breather pipe,

Would have expected the engine to splutter to a stop if it was blocked, and be happy again after opening the filler cap, not maybe a loose vacuum pipe of some description
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Post  terry lees Mon May 16 2011, 14:09

At first thought it sounded like a blocked breather, but seeing as it does'nt do it when you open the filler cap, I'm inclined to go with Steves theory.
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