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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Need Advice, can't keep an idle (intermittently) approaching or at a stop with New Amal 276's
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<blockquote data-quote="Andy H" data-source="post: 132539" data-attributes="member: 3136"><p>I want to join this thread because after 55,000 very reliable miles my Touring Rapide has been `less than nice` at slow speed. It was starting 1st kick ( A good swing with the valve lifters then let go !) Even with a pair of trainers as footwear. Then I embarked on the 2019 International rally. Before I went I fitted new original type Amals and probably had a bit of cable hang up as it was a bit fast running at times. </p><p></p><p>Unfortunately in a horrendous thunder storm in Dachau my magneto filled with water. After wonderful assistance from fellow VOC Rallyists ( previously reported on) and a borrowed magneto all appeared well and Peter Volkers tuned my carbs. It ran well afterwards.</p><p></p><p>I have now refitted my professionally overhauled magneto and it is terrible. Cannot tune it at all to tick over. It just won`t settle down yet will easily exceed permitted speeds and zoom uphill under load., but horrible below 30mph. I am happy the timing is correct. It feels like it always did except below 30 !!</p><p></p><p> It has been suggested I may have a sticking ATD. </p><p> </p><p>Obviously not applicable to this initial thread with a BTH one.</p><p>I fitted new return springs but they were no different than the ones I changed and on the bench it seems to flick back OK. It is a heavy duty one that I bought new when I rebuilt the bike at zero mileage. I would have thought age would loosen it not tighten it !</p><p></p><p>It is not a device I can take apart to check ,if indeed that is the problem.</p><p>I have new Champion N5s which I find are perfect. Had two breakdowns with failed NGKs on the 2014 Italian rally. Was given a second hand set of N5s and did another 2000 miles without a misfire.</p><p>I did not touch the carb adjustments during mag overhaul and about 3 months of standing only. Because it would not run right I have since stripped and checked them for swarf but they look perfect.</p><p></p><p>I know from many years of bike riding carb problems are often electrical and vice versa which is the frustration of which to blame first.</p><p>I had this problem when the engine first ran on the 1999 rally and did 3000 miles before the problem was diagnosed. The valve timing on one cylinder was way out of sync. Discovered when I fitted a set of K and N filters which washed clean on the rear cylinder. It was blowing through the carb before sucking !</p><p>I have ridden over 50,000 miles with K&Ns with no adverse effects.</p><p>Now I will need to check to see if a camshaft has slipped I suppose, but again wouldn`t expect it after all this time.</p><p>Any ideas?</p></blockquote><p></p>
[QUOTE="Andy H, post: 132539, member: 3136"] I want to join this thread because after 55,000 very reliable miles my Touring Rapide has been `less than nice` at slow speed. It was starting 1st kick ( A good swing with the valve lifters then let go !) Even with a pair of trainers as footwear. Then I embarked on the 2019 International rally. Before I went I fitted new original type Amals and probably had a bit of cable hang up as it was a bit fast running at times. Unfortunately in a horrendous thunder storm in Dachau my magneto filled with water. After wonderful assistance from fellow VOC Rallyists ( previously reported on) and a borrowed magneto all appeared well and Peter Volkers tuned my carbs. It ran well afterwards. I have now refitted my professionally overhauled magneto and it is terrible. Cannot tune it at all to tick over. It just won`t settle down yet will easily exceed permitted speeds and zoom uphill under load., but horrible below 30mph. I am happy the timing is correct. It feels like it always did except below 30 !! It has been suggested I may have a sticking ATD. Obviously not applicable to this initial thread with a BTH one. I fitted new return springs but they were no different than the ones I changed and on the bench it seems to flick back OK. It is a heavy duty one that I bought new when I rebuilt the bike at zero mileage. I would have thought age would loosen it not tighten it ! It is not a device I can take apart to check ,if indeed that is the problem. I have new Champion N5s which I find are perfect. Had two breakdowns with failed NGKs on the 2014 Italian rally. Was given a second hand set of N5s and did another 2000 miles without a misfire. I did not touch the carb adjustments during mag overhaul and about 3 months of standing only. Because it would not run right I have since stripped and checked them for swarf but they look perfect. I know from many years of bike riding carb problems are often electrical and vice versa which is the frustration of which to blame first. I had this problem when the engine first ran on the 1999 rally and did 3000 miles before the problem was diagnosed. The valve timing on one cylinder was way out of sync. Discovered when I fitted a set of K and N filters which washed clean on the rear cylinder. It was blowing through the carb before sucking ! I have ridden over 50,000 miles with K&Ns with no adverse effects. Now I will need to check to see if a camshaft has slipped I suppose, but again wouldn`t expect it after all this time. Any ideas? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Need Advice, can't keep an idle (intermittently) approaching or at a stop with New Amal 276's
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