Cbr6 dropping cylinder

kramdra · World Chat Champion Joined: 28 Oct 2010 Karma :

Bike has been running rough usualy in very wet weather. I assumed electrics as it was fine in dry weather. It is now occurring in the dry.

The sound is cross between a blowing exhaust (its not) and a tractor. I havent noticed any massive loss of power...

All exhausts are equally hot. Going to pull sparkplugs, coils and check connectors. Any ideas?

skip to 40 seconds on, too much windnoise when riding.
www.youtube.com/watch?v=Wxz6kZhiuWU

orac · World Chat Champion Joined: 25 Sep 2011 Karma :

coils caps or leads, maybe a plug but those should be changed as a matter of course in fault finding.
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kramdra · World Chat Champion Joined: 28 Oct 2010 Karma :

Ok I was wrong. Its just exuast headers blowing and rattling where the clamp is loose. The nuts are not loose. Im not going to touch it, perhaps studs coming out?

Right 2 years ago I attempted to replace downpipes, 7 studs snapped so I took it to p&h. They took head off and fixed it, £800 :o

Should last longer than 2 years/15k miles?

Itchy · Super Spammer Joined: 07 Apr 2005 Karma :

kramdra · World Chat Champion Joined: 28 Oct 2010 Karma :

Oh I am well aware Laughing

the original downpipes rusted through, these are the motad replacements. In total labout cost me £800 and pipes £150. Plus a lot of tools attempting to DIY. I spent two months trying to DIY.

When I DIY removed the original exhaust, 7 studs snapped. I tried to drill one out and fucked up, so I took it to P&H who had my bike 3 months.

Not certain how they repaired it, but I was told the head needed to come off, they subcontracted the stud removal, and possibly TIG welded my fuckup ( unless its a replacement head, but it better fucking not be). I asked for some items of service - brake fluid change, pads, valve clearances (of which I have no evidence, no paper saying shim sizes or if any were changed).

I also supplied stainless M8 studs for them, but they refused and insisted on fitting plain steel M8-M6 reducing studs Evil or Very Mad

The bike was returned with the front end undone inc calliper bolts (I made them well aware it was undone even if they didnt touch it). Brakes were spongy so they re-bled her.

A week later 3 nuts had came off of the exhaust studs and was blowing badly Evil or Very Mad

I was not happy and had little confidence the engine was correctly reassembled.

So the current problem - the nuts do not seem to be loose, yet the flange holding cyl 3 pipe on, is very loose. I can only assume the threads are heicoiled and have started to pull out. The motad pipes seem to be perfectly fine.

If it wasnt for sods law (if I touch it every other stud could snap), I would remove the loose studs and drill/tap for M10 straight 416-80 grade stainless studs. Or titainium, or something better.