Yamaha FZR400 4DX Rattle

[CBRMAN94]

Hi all,
Got a rattle on my FZR and for the life of me, can't work out what's going on!

It only appears at idle and up to about 4k and started a couple month ago.

I've changed the Cam Chain Tensioner with little success.

I've left a video below to of the sound. I was convinced it was cam chain until i changed the tensioner and nothing changed.

https://s1356.photobucket.com/user/Andrew_Drape/media/VIDEO0019_zpsf14b0332.mp4.html?filters[user]=134105690&filters[recent]=1&sort=1&o=0
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Honda CBR-RW6 (Sold) - Kawasaki GPZ500s (Sold) - Honda CG125 (Project) - Honda CB750 Cafe racer (Project) - Yamaha FZR400RR

[Hugh Farking Cant]

Cannot tell from that video.
Fzr's are notorious for Exup valve rattle.
Pulling on the cables manually is an easy test.
Worthwhile servicing the valve regardless.

[Fizzer Thou]

That sounds much more like a carb problem.

Are you running a K&N air filter?If so,has it got a jetting kit fitted to compensate?

How many turns out from seated are the air screws?

If you spray WD40 around the inlet manifolds,do the engine revs rise?

Can you get a clean tickover?

Has the engine been serviced recently?

When were the carbs last balenced?

Are all of the cylinders firing ok? (throw some water on the downpipes)
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Just talk bikes.What else is there?

Always have a 'Plan B'

[weasley]

Not conclusive from the video, but I'd be starting at the header-to-cylinder head joins and working my way down the exhaust looking for leaks and rattles.
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Yamaha XJ600 | Yamaha YZF600R Thundercat | KTM 990 SMT | BMW F900XR TE

[CBRMAN94]

Thanks for the replies

Haven't checked the EXUP, I'll have a look at that.

The carbs are all standard, standard airbox and haven't been touched from the factory although i do have restrictions in (Washers).
Idles very steady.
Do have a problem with a slight misfire on one cylinder from cold but goes after a few seconds.
Been serviced a couple months ago and the carbs could probably do with being balanced now the restrictions are in.

I'll take a look at the exhaust too

Thanks guys!
____________________
Honda CBR-RW6 (Sold) - Kawasaki GPZ500s (Sold) - Honda CG125 (Project) - Honda CB750 Cafe racer (Project) - Yamaha FZR400RR

[misscrabstick]

Does sound to me as if the bike is running roughly on maybe 2 cylinders out the four, check the carbs, misfiring will make the clutch rattle, the shafts inside rattle and all sorts, your video wasn't very long though really for a decent opinion.

[CBRMAN94]

[CBRMAN94]

Thanks for all the help guys, Been in the shed all day and sorted it
Turns out it was the EXUP valve that just needed adjusting, Honestly didn't think that it would cause a sound like that but there you go.
____________________
Honda CBR-RW6 (Sold) - Kawasaki GPZ500s (Sold) - Honda CG125 (Project) - Honda CB750 Cafe racer (Project) - Yamaha FZR400RR

[Hugh Farking Cant]

Thank you for the follow up.
The misfire at initial start up is a classic sign of valve clearance issues, time for a compression test or cam cover off.

[MarJay]

My FZR400RR 3TJ sounded like it was dying. It was in fact just the EXUP valve bushes which had worn meaning that it was loose inside the housing. Sounded surprisingly like a big end bearing or similar.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[CBRMAN94]