Collapsed CAT or Lego bricks

Repairs, modifications, bling and tings

Collapsed CAT or Lego bricks

Postby Monty » 03 Sep 2016, 13:02

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I've not ridden the bike for over 3 weeks and so far only taken the can off and had a look in the baffle box.

The bike is going into the garage on Monday for it's first chain and sprockets, I'm not doing the first front sprocket change on a Kwak. So thinking I might get them to take the headers off and knock out the CATs while it's in. Or just retrieve the Lego bricks!
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Re: Collapsed CAT or Lego bricks

Postby Kwacky » 03 Sep 2016, 13:49

No idea. It does sound like thick plastic.

How many miles have you got on the clock.
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Re: Collapsed CAT or Lego bricks

Postby Monty » 03 Sep 2016, 13:53

About 8k now, it started a few weeks after I fitted the can
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Re: Collapsed CAT or Lego bricks

Postby Kwacky » 03 Sep 2016, 14:14

Weird. The CAT shouldn't have fallen apart so soon.
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Re: Collapsed CAT or Lego bricks

Postby Monty » 03 Sep 2016, 14:30

I've found one example of it happening on the Internet, and strangely it happened just after he'd fitted an aftermarket can.

I hope it is the CAT, they were coming out this winter anyway and was going to fit a pinebox
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Re: Collapsed CAT or Lego bricks

Postby Itchy » 03 Sep 2016, 14:36

Do a massive wheelie down the road, hoefully the Lego will just fall out!
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Re: Collapsed CAT or Lego bricks

Postby Kwacky » 03 Sep 2016, 15:11

Maybe the gasses are hotter so cause it to crumble?
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Re: Collapsed CAT or Lego bricks

Postby Deegee » 03 Sep 2016, 18:13

Kwacky wrote:Maybe the gasses are hotter so cause it to crumble?


Cats do get very hot, iirc the early 675's had a problem with them overheating and deforming which led to partial blockage of the exhaust and a fair bit of power loss, the engines ran weaker with an aftermarket can (less back pressure), and a weak mixture is a hotter mixture - adding to quicker cat failure.
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Re: Collapsed CAT or Lego bricks

Postby duke63 » 04 Sep 2016, 22:06

Did you remove the exhaust valve and disconnect all the cables when you changed the exhaust?
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Re: Collapsed CAT or Lego bricks

Postby Monty » 05 Sep 2016, 11:34

Deegee wrote:
Kwacky wrote:Maybe the gasses are hotter so cause it to crumble?


Cats do get very hot, iirc the early 675's had a problem with them overheating and deforming which led to partial blockage of the exhaust and a fair bit of power loss, the engines ran weaker with an aftermarket can (less back pressure), and a weak mixture is a hotter mixture - adding to quicker cat failure.


That's what I was thinking (hoping)
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Re: Collapsed CAT or Lego bricks

Postby Monty » 05 Sep 2016, 11:37

duke63 wrote:Did you remove the exhaust valve and disconnect all the cables when you changed the exhaust?


No still there and connected, it's built into the Akro. First thing I checked, took the can off and it's fine.

Dropping it off at the garage this lunch time.
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Re: Collapsed CAT or Lego bricks

Postby Monty » 06 Sep 2016, 11:00

Garage phoned and there's something loose and rattling around behind the CATs. They are knocking them out as we speak, can't wait to hear what it sounds like.
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Re: Collapsed CAT or Lego bricks

Postby Monty » 06 Sep 2016, 16:54

Sorted, the first CAT had come loose and was rattling on the second one. Sounds much better now and loads of pops and bangs

So glad I didn't try and fit those new sprockets, theres no way I could have got the front sprocket off. Their own impact driver couldn't budge it and they had to borrow one off the Snap-On rep
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Re: Collapsed CAT or Lego bricks

Postby Kwacky » 06 Sep 2016, 20:21

Kwaks are known for that tight front sprocket.

Glad it's all sorted.
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Re: Collapsed CAT or Lego bricks

Postby duke63 » 06 Sep 2016, 21:03

I bet that spent 1 minute fishing out a lego brick and then charged Monty for a few hours labour to remove the offending CAT. :D
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Re: Collapsed CAT or Lego bricks

Postby D41 » 12 Sep 2016, 21:01

Monty wrote:So glad I didn't try and fit those new sprockets, theres no way I could have got the front sprocket off. Their own impact driver couldn't budge it and they had to borrow one off the Snap-On rep



You can't just use a cheater bar to take it off??

Well....not now, but you know what I mean.
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