yzeefoureight Posted July 3, 2010 Report Share Posted July 3, 2010 A mate of mine has just bought a 2008 rev 4, when he got it home he was concerened about some noise from the engine, he stripped it down to find a good bit of wear on the valve guides. He has contacted the importer & the valve guides are unavailable. Does anyone know if there are other valve guides which will fit of any other bike & are these engines naturaly noisey tapetty sounds etc. Thanks. Quote Link to comment Share on other sites More sharing options...
godzilla Posted July 3, 2010 Report Share Posted July 3, 2010 They are pretty noisy motors, they give off a tappety noise, i had a Rev4 and was unsue about the sound. My mate has an 2010 Evo 4t and thats just as noisy. Quote Link to comment Share on other sites More sharing options...
copemech Posted July 4, 2010 Report Share Posted July 4, 2010 Many motors run the valves a bit loose in the guides it seems. Although this may defeat conventional wisdom to an extent and vary with design. Thi primary issue is still the valve sealing upon the seat area, and if this is still good(seats and valves sealing surface not worn) , a bit of tick may be dismissed. Do you have specs and limits? It takes a REAL specialty shop to do these things as far as renewal goes, not amature work, probably similar to the Honda heads, but may still cost nearly as much as new! Quote Link to comment Share on other sites More sharing options...
nzralphy Posted July 4, 2010 Report Share Posted July 4, 2010 An engine specialist would replace them quite easily. But really..... I'd be surprised if they had warn! What measurement did you come up with? Quote Link to comment Share on other sites More sharing options...
zerorev3rev4 Posted July 7, 2010 Report Share Posted July 7, 2010 engine shop has confirmed there is accesive play inbetween stem and guide ,i am waiting to hear from beta if guides are avaiable ,if not they may need to be made Quote Link to comment Share on other sites More sharing options...
zerorev3rev4 Posted July 20, 2010 Report Share Posted July 20, 2010 head now back with new guides fitted looking good also replacing timing chain cam bearings and tappet adjusters ,amongst other bits n bobs Quote Link to comment Share on other sites More sharing options...
kramit Posted July 21, 2010 Report Share Posted July 21, 2010 engine shop has confirmed there is accesive play inbetween stem and guide ,i am waiting to hear from beta if guides are avaiable ,if not they may need to be made Sometimes the guides can be knurled and then re-sized to original spec. as long as the wear is not excessive and you can find a reamer that is the original size Quote Link to comment Share on other sites More sharing options...
embalmer Posted July 21, 2010 Report Share Posted July 21, 2010 head now back with new guides fitted looking good also replacing timing chain cam bearings and tappet adjusters ,amongst other bits n bobs how much did the guides cost to be done mate? also is the valves shim or locknut adjustment? cheers Quote Link to comment Share on other sites More sharing options...
zerorev3rev4 Posted July 23, 2010 Report Share Posted July 23, 2010 Quote Link to comment Share on other sites More sharing options...
amiller Posted August 9, 2010 Report Share Posted August 9, 2010 Happen to know the specs for the valve lash? Quote Link to comment Share on other sites More sharing options...
zerorev3rev4 Posted August 16, 2010 Report Share Posted August 16, 2010 cant remember for certain but .25 rings a bell you best speak to the mechanic at lampkins uk what you do is fit the valve so the stem is level with the top of guide where seal fits then rock the head of valve and measure the movement there ,if it looks accesive it probably is ,,also look at side movement on the rockers Quote Link to comment Share on other sites More sharing options...
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