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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Running in Questions Series D
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<blockquote data-quote="vince998" data-source="post: 23075" data-attributes="member: 261"><p>Hi Mac, good to hear you´ve got it running and another D is alive!!</p><p>Seeing as you´ve rebuilt the whole engine (new bearings bushes etc) the slowly slowly approach is correct. (had it just been a rebore and pistons/ rings, i have just read an article that suggests short hard runs with stops to cool off inbetween is the best way of running in new rings to the barrel. I´ll try this next time)</p><p>Don´t worry to much about higher revs or speed in gears, just make sure the engine has as little work to do as possible at this early stage (50 in 4th on an uphill gradient can be more damaging than letting the bike climb at the same speed in 3rd or second). On downhill bits, you can let the bike do its thing and pull the engine. The trick is not to let the engine labour or get to hot for long periods.</p><p>As long as no unusual rattles appear, i would change the oil at 500 miles (be prepared for a scattering of metal particles in all colours), then at 1000 and then at 2000.You´ll probably burn a bit of oil during the first 500 miles so keep topping up.</p><p>Don´t worry about the pipes changing colour at this point, your on the pilots at these speeds so the mixture will be a bit on the weak side.(Apart from that, purple near the nuts tapering off to straw down the pipe sounds about right)</p><p>Gearchange problems sounds like adjustment of the stops needs looking at. Make sure the spring loaded bronze arm thingy (sorry, it´s early) is centralised between the stops (by adjusting the stop plate).</p><p>You´re performing a balance act at the moment of giving the rings a chance to bed in (for this they have to be prressed out onto the bores which means they need working), and not overloading/overheating the new guides/bushes/bearings etc.</p><p>Once you have the feeling the rings are starting to free up (this should be evident after 500 miles) take it onto the motorway for a couple of hours at easy speeds (i accelerate-shut off, accelerate, shutoff at 1 mile intervals at this stage, using no more than 1/2 throttle. Once i´ve reached 1000 miles, i´ll slowly increase the throttle settings every 100 miles or so) This gives the engine a chance to thouroughly warm up and operate at normal speeds/tolerances. It´ll also bring any leaks to your attention.</p></blockquote><p></p>
[QUOTE="vince998, post: 23075, member: 261"] Hi Mac, good to hear you´ve got it running and another D is alive!! Seeing as you´ve rebuilt the whole engine (new bearings bushes etc) the slowly slowly approach is correct. (had it just been a rebore and pistons/ rings, i have just read an article that suggests short hard runs with stops to cool off inbetween is the best way of running in new rings to the barrel. I´ll try this next time) Don´t worry to much about higher revs or speed in gears, just make sure the engine has as little work to do as possible at this early stage (50 in 4th on an uphill gradient can be more damaging than letting the bike climb at the same speed in 3rd or second). On downhill bits, you can let the bike do its thing and pull the engine. The trick is not to let the engine labour or get to hot for long periods. As long as no unusual rattles appear, i would change the oil at 500 miles (be prepared for a scattering of metal particles in all colours), then at 1000 and then at 2000.You´ll probably burn a bit of oil during the first 500 miles so keep topping up. Don´t worry about the pipes changing colour at this point, your on the pilots at these speeds so the mixture will be a bit on the weak side.(Apart from that, purple near the nuts tapering off to straw down the pipe sounds about right) Gearchange problems sounds like adjustment of the stops needs looking at. Make sure the spring loaded bronze arm thingy (sorry, it´s early) is centralised between the stops (by adjusting the stop plate). You´re performing a balance act at the moment of giving the rings a chance to bed in (for this they have to be prressed out onto the bores which means they need working), and not overloading/overheating the new guides/bushes/bearings etc. Once you have the feeling the rings are starting to free up (this should be evident after 500 miles) take it onto the motorway for a couple of hours at easy speeds (i accelerate-shut off, accelerate, shutoff at 1 mile intervals at this stage, using no more than 1/2 throttle. Once i´ve reached 1000 miles, i´ll slowly increase the throttle settings every 100 miles or so) This gives the engine a chance to thouroughly warm up and operate at normal speeds/tolerances. It´ll also bring any leaks to your attention. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Running in Questions Series D
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