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robalan

Joined:

Feb 12

Posts: 2

robalan says:

VFR750 NOISY VALVES

My VFR750FS has developed a regular tapping sound from the rear cylinder valve gear when ticking over and up to temperature. All the valve clearances are within spec. It does not do it when cold. My Haynes manual says a modification can be done to the camshaft holders on S and T models, if excessive noise is apparent. I have tried to discover what this mod is without success. Can anyone help ?

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  • Posted 3 years ago (19 February 2012 18:03)

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kcmc

Joined:

Jan 08

Posts: 7077

kcmc says:

Honda VFR 750 FS 1995?

Hi Robalan and welcome to the site:smile

Never heard of the mod you talk of?,but it could just be a blowing exhaust header pipe making this  tapping sound.Is the bike high mileage,has it any history of breaking down,or any modification?.Good Luck

KCMC:tongue: 

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steven.hood7

Joined:

Jan 08

Posts: 283

steven.hood7 says:

VFR NOISEY VALVES

I remember something about your vfr year and model having a problem with camshaft end-float. The ticking was stopped by shimming the camshaft to eliminate the excess movement. Drop onto a dedicated vfr forum to find out more info.

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robalan

Joined:

Feb 12

Posts: 2

robalan says:

VFR750 NOISY VALVES

Thanks for your reply. The tapping noise is mechanical, not a blowing exhaust. Yes, it's a 1995 with 43K miles on the clock, with no history of any other problem or modification. I suspect lubrication as the cause and wonder if the modification to the camshaft holders is a cure. I have tried 3 dealers and either they don't know or they won't tell me what the Haynes manual is referring to. :hmmm:

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kcmc

Joined:

Jan 08

Posts: 7077

kcmc says:

Honda VFR 750 FS 1995

Hi again Robalan

I would be more than interested to know what this modification is?as i said never heard of it:wacko:.

If its definitely mechanical,then i think i would be looking at a cracked bucket,or the valve tunnel the bucket runs in(in the head) is worn allowing it to rock,or a damaged lobe on a cam,or lifter bucket,or a bent valve sticking when heat expands its shaft,or a worn or damaged valve guide.Have you tried slackening off the cam caps and re-torquing them down?this will also show up any of the bolts that may have stripped in the head causing this mystery noise.If you can't find it there then you may need to remove the lot,cam gear train and all,and inspect it to see if there is a problem there.

 87 HONDA VFR700 VFR 700 F REAR CYLINDER HEAD+CAM GEAR

Good Luck

KCMC:tongue:

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downshift

Joined:

Feb 10

Posts: 292

downshift says:

Tapping

My VFR800 has a slight tapping/ticking sound which only appears on idle when it's up to temp. It's done it since I had it at 11k miles, now on 33k miles. All valves in spec, checked them myself last week, and in fact ALL of them were on the tighter side of the allowed tolerance. In my case could be the sound of injectors, but I just assume there are so many moving parts, total smoothness is impossoble, even on a VFR!

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