VFR800f 2015 - R&G Bung Issues

#1
My lovely red VFR800f has just returned from my local dealers following it's 24k service, when I collected her I was advised that on the test ride they had notice a clunk when pulling up sharply. Initial investigations had suggested that there was wear in the R&G bung bolt that replaces the original enging mountings bolts that secure the engine to the frame. This is supported by a reduction in the noise after they nipped it all up. The noise is still there and is also audible when accelerating with umph.

Now this isnt something I have heard of before, and certainly not experineced it on my previous Vtec or 1200, both of which had the bungs fitted and were on similar mileage (21k) at this point in their lives. Has anyone else experienced anything similar?

The next stage is going to see the bungs removed and original bolts fitted, if this removes the issue then it would suggest that the bungs are the source, but if not the list could be endless (head bearings, wear in fork bushes, wear in rear shock linkages etc....)

Any comments would be appreciated.
 

fink

living up to the name
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#2
First time I’ve heard of that regarding bungs. I would do as you say and try with the original bolts back in.
 

reeseyboy

Just a boy, named Rees
#3
I had this with a set of bungs fitted by a dealer when I bought a CB1000R. Clunked when pulling away and when stopping too. Turns out that the workshop had got the plain and the locking washers the wrong way round and the bolts had come loose. Bolts were half a turn off seated. Another reason why I’d never use Doble again...
 
#4
Thanks for teh commenst chaps, will follow up on Reeseyboy's comments with the dealer. I dont recall there being an issue when I took the bike in, the bungs would have had to come out for the service so incorrect reassembly could be the issue.

Cheers
 
#5
Further to the above, it was found that the root cause is significant corrosion on the crash bung shaft that replaces the main engine bolts. The shafted had siezed into the frame, meaning that when tightening up the bolts all it was doing was crushing the bungs and not touquing up the engine. Hense some slight movement and the mystry creak.

Now just waiting to see if R&G will sort out a replacement kit of some monies off a new one!
 

HDVFR

Registered User
#6
Not meaning to hijack this thread but has anyone fitted R&G crash protectors themselves,I have a set in the garage but am a bit reluctant to fit them,it's that drilling the fairing wot's the scary bit.
 

fink

living up to the name
Site Sponsor
#7
Nope, do have a set of T. rex to fit when I get a chance. Have to say on any R&G slider I have always greased the bolt where it went through the frame.
 

reeseyboy

Just a boy, named Rees
#8
Not meaning to hijack this thread but has anyone fitted R&G crash protectors themselves,I have a set in the garage but am a bit reluctant to fit them,it's that drilling the fairing wot's the scary bit.
I turned a taper onto an old engine bolt after cutting the head off, then screwed it in place of the bolt to be removed. I then pressed the fairing against the pointed end, essentially centre-punching the fairing. Then used a new arbor and holesaw to cut the required hole. Job done.
 
#9
I have always lacked the courage to do it myself and have managed to convince the dealers in both cases where they were fitted from new. On my first VTEC the dealer refused to do it (a second hand bike) and I bottled it, sold them on eBay and bought a no drill set that fitted to frames that went over the radiators.
 
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