July 3, 201016 yr 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.
July 3, 201016 yr 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.
July 4, 201016 yr 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!
July 4, 201016 yr 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?
July 7, 201016 yr 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
July 20, 201016 yr head now back with new guides fitted looking good also replacing timing chain cam bearings and tappet adjusters ,amongst other bits n bobs
July 21, 201016 yr 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
July 21, 201016 yr 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
August 16, 201016 yr 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
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