alhendo1 3,046 Posted September 12, 2020 Share Posted September 12, 2020 Possible daft question alert!!... Do screw and locknut tappets have to be adjusted stone cold or can they be adjusted while there is still residual heat in the engine? Link to post
Dunnster 1,650 Posted September 12, 2020 Share Posted September 12, 2020 No daft questions, maybe silly replies but eventually you'll get the correct answer..... Ive always done mine stone cold. 1 Link to post
Argyll 1,334 Posted September 12, 2020 Share Posted September 12, 2020 Obviously best done stone cold but I believe that some garages do them after 2 or 3 hours resting. 1 Link to post
Grumpy old man 4,681 Posted September 12, 2020 Share Posted September 12, 2020 For the NC range stone cold, that's why the dealer needs the bike in the night before to allow the bike to be cold when they do the job. At least they did with mine. 1 Link to post
Andy m 23,542 Posted September 12, 2020 Share Posted September 12, 2020 Stone cold for me. I doubt anything would be that bad if it had the oil changed first thing and the valves done mid afternoon, at least not in the UK climate, but it isn't a one day, collect at lunchtime job. Andy 1 Link to post
SteveThackery 3,090 Posted September 12, 2020 Share Posted September 12, 2020 It varies with the particular bike, though. For example, my first Indian Royal Enfield had a tappet clearance of zero, set when the engine is "warm", whatever that means! It was a pushrod engine, unlike the NC. Link to post
Tex 36,817 Posted September 12, 2020 Share Posted September 12, 2020 4 hours ago, SteveThackery said: It varies with the particular bike, though. For example, my first Indian Royal Enfield had a tappet clearance of zero, set when the engine is "warm", whatever that means! It was a pushrod engine, unlike the NC. Does the Enfield still have the tappet adjusters at the bottom of the barrel? Can’t argue about ease of access with that system! Link to post
SteveThackery 3,090 Posted September 13, 2020 Share Posted September 13, 2020 15 hours ago, Tex said: Does the Enfield still have the tappet adjusters at the bottom of the barrel? Can’t argue about ease of access with that system! No, the current engine has hydraulic lifters. 3 1 Link to post
Slowboy 20,499 Posted September 13, 2020 Share Posted September 13, 2020 19 hours ago, SteveThackery said: It varies with the particular bike, though. For example, my first Indian Royal Enfield had a tappet clearance of zero, set when the engine is "warm", whatever that means! It was a pushrod engine, unlike the NC. It means not cold and not so hot you resort to early Anglo Saxon to express how hot it actually is.😁 4 Link to post
davebike 943 Posted September 14, 2020 Share Posted September 14, 2020 Jap bikes I was taught "cold" and "cold" defined as not hot to the touch This was Suzuki GB long ago but same princable used at Yamah and Honda dealers I worked at and I used fro "cough" years ! Link to post
Andy m 23,542 Posted September 14, 2020 Share Posted September 14, 2020 On 13/09/2020 at 09:57, SteveThackery said: No, the current engine has hydraulic lifters. Which given they fit in almost the same tube as the old pushrods, it's pretty hard to forgive them for then switching to shims on the 650's. To put the numbers into context a 100 degree rise in temperature will cause a 6 inch long steel pushrod to expand by about 3 - 4 thou. A typical valve feeler is 8 or 10 thou, so a hot engine will result in error of maybe 50%. At room temperature, be it on the radiator after my wife set the thermostat or after she broke the boiler, its all the same. Its just humans that are very good in the range 15 to 30 C. Andy 1 Link to post
Argyll 1,334 Posted September 14, 2020 Share Posted September 14, 2020 40 minutes ago, Andy m said: it's pretty hard to forgive them for then switching to shims on the 650's. Which bike are you referring to? Link to post
SteveThackery 3,090 Posted September 14, 2020 Share Posted September 14, 2020 1 hour ago, Andy m said: Which given they fit in almost the same tube as the old pushrods, it's pretty hard to forgive them for then switching to shims on the 650's. Is the 650 a pushrod engine? I just assumed it was OHC. Link to post
Tex 36,817 Posted September 14, 2020 Share Posted September 14, 2020 2 hours ago, Argyll said: Which bike are you referring to? 1 hour ago, SteveThackery said: Is the 650 a pushrod engine? I just assumed it was OHC. I think it’s OHC with screw and locknut adjusters. It’s definitely the latter! 1 Link to post
SteveThackery 3,090 Posted September 14, 2020 Share Posted September 14, 2020 Just now, Tex said: I think it’s OHC with screw and locknut adjusters. It’s definitely the latter! I thought so. So hydraulic lifters aren't used because they take up too much space in a motorcycle cylinder head. Link to post
RC166 694 Posted September 15, 2020 Share Posted September 15, 2020 Nice piccy Argyll! Is that with a proper camera or phone? Any enhancements to get the desired result? Link to post
Argyll 1,334 Posted September 16, 2020 Share Posted September 16, 2020 The pic was taken with my 2yr old Motorola G6. It does have a fairly decent camera though. The problem, of course, is trying to work with a touchscreen whilst wearing oily nitrile gloves! 1 Link to post
Argyll 1,334 Posted September 16, 2020 Share Posted September 16, 2020 It's not so good under artificial light though (see pic below), but it's handy. I sometimes use my Sony RX100 but I try to keep it oil-free 2 1 Link to post
RC166 694 Posted September 16, 2020 Share Posted September 16, 2020 That looks a nice restoration job. Interested to hear all about it! Link to post
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