spanner said:
Spanner when you have fitted the valve springs you might have to remove some material from the insides of the rocker lid to stop the valve spring tops catching.
Regards
Sparks.
spanner said:
Spanner when you have fitted the valve springs you might have to remove some material from the insides of the rocker lid to stop the valve spring tops catching.
Regards
Sparks.
Joined Sep 2007
782 Posts | 291+
???
Thanks for the tip sparks. It should also be noted that springs expand slightly when they are compressed so a bit of extra clearance is good. Now all I need is some of the big valves. Does any one know what will fit 2005 650? Is the head gasket reuseable? Cheers, Spanner.
Joined Sep 2007
782 Posts | 291+
???
Can you give me the valve sizes for 2005 650 Taffy, anyone? ie, stem dia, overall length, distance of grove to top of stem. It might be just as easy to get some exhaust valves from an earlier 650 if the stems and overall length, etc, are the same. Exhaust valves maybe made of higher grade material than inlet valves to resist the heat. Cheers, spanner.
Joined Nov 2001
17K Posts | 774+
Ely, England
NO THEY ARE NOT.
hope that's is a little bit clearer to you.
they have never fitted a 32mm valve.
get some 35s and turn them down. get on with it. anything else you can get around.
get the 35s, get them turned down by taking another exhaust valve ans an example. generally the valves stay the same distance into the head.
imagine the front face of the valve ok? you are taking away the outside edge of the valve but the face sits still. if the face sits still the valve hasn't sunk has it!!!!!!!!!!!!!!!
with the extra 'meat' on the inlet you'll be fine for a fatter exhaust.
so get on with it!!!!!!!!!!!!!!!
regards
Taffy
hope that's is a little bit clearer to you.
they have never fitted a 32mm valve.
get some 35s and turn them down. get on with it. anything else you can get around.
get the 35s, get them turned down by taking another exhaust valve ans an example. generally the valves stay the same distance into the head.
imagine the front face of the valve ok? you are taking away the outside edge of the valve but the face sits still. if the face sits still the valve hasn't sunk has it!!!!!!!!!!!!!!!
with the extra 'meat' on the inlet you'll be fine for a fatter exhaust.
so get on with it!!!!!!!!!!!!!!!
regards
Taffy
Joined Sep 2007
782 Posts | 291+
???
Calm down Taffy I did say " maybe" and in other motors that is quite often the case. I haven`t opened one off these motors yet so I am only going on what is the norm. I thought I read somewhere that the earlier 650 had larger valves so a swap would require no turning "maybe" that was only the inlet valve. I am also not in to much off a hurry. Thanks for your reply Taffy, Cheers mate.
Joined Nov 2001
17K Posts | 774+
Ely, England
spanner said:
what in "no" don't you understand?
they are made of the same material but machined for more meat on the exhausts. all the info is in the doc under tuning and i don't know why you're asking all this again. just to repeat incase you can't find the owner's doc in the left of screen index: the early heads of over 400cc had 37/30 and then in '03 everything went to 35/30. it's the inlets from this year that will do you.
but as you say 'you haven't had the head off yet and you're not in too much of a hurry'. i know what that roughly translates too.
Taffy
Joined Sep 2007
782 Posts | 291+
???
Taffy it doesn`t translate to anything other than than that. I have springs on the way, thanks to your informed advice I will only put larger exhaust valves in. I agree completely with this. I don`t wont to open the motor untill I have everything at hand. I would like to clean up the inlet ports up a bit, a bit of grinding and matching , bellmouth on carb etc. What are your thoughts on these? Cheers, Harvey.
Joined Sep 2002
52 Posts | 0+
ti valves
if this info is any help. in an old roadracing engine (kiyo watanabe) used brass (i think) for the seats when we installed larger titanium valves. this was to help prevent the valves from mushruming. she was a real screamer. 2 national titles.hhmmm.... i wonder if he would build a berg.
if this info is any help. in an old roadracing engine (kiyo watanabe) used brass (i think) for the seats when we installed larger titanium valves. this was to help prevent the valves from mushruming. she was a real screamer. 2 national titles.hhmmm.... i wonder if he would build a berg.
Joined Nov 2001
17K Posts | 774+
Ely, England
yes it can. but it isn't necassary. let's start again. you have a 37/30 head and i don't know of any Ti 37s there probably are and Dr_C probably does!
35s yes. 37s not sure. the exhausts aren't necassary as trhey are smaller and lighter.
if you would PM me we can discuss it further.
regards
Taffy
35s yes. 37s not sure. the exhausts aren't necassary as trhey are smaller and lighter.
if you would PM me we can discuss it further.
regards
Taffy
Joined Sep 2007
782 Posts | 291+
???
Beryllium copper is what the seats are made of for titanium valves. There is two different grades one used for inlets and the other for exhausts. Does anyone know the sizes for the standard valves, ie stem diameter, overall length, grove position from top of valve, shape of grove. If I know these I could search for alternatives.
Joined Nov 2001
17K Posts | 774+
Ely, England
spanner
yoyu're right about the berylium but nobody uses it because it's cancerous and has to be done in the right conditions.
a 650 can't rev to where the steel valves bounce so what is the point?
go into weeds gallery and look at his SS valve option.
regards
Taffy
yoyu're right about the berylium but nobody uses it because it's cancerous and has to be done in the right conditions.
a 650 can't rev to where the steel valves bounce so what is the point?
go into weeds gallery and look at his SS valve option.
regards
Taffy
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