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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Request for advice - Rapide 276 Carburettors
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<blockquote data-quote="BlackLightning998" data-source="post: 4459" data-attributes="member: 109"><p><strong>Latest update - any more thoughts?</strong></p><p></p><p>Evening all,</p><p></p><p>Here is the latest update for consideration and any more advice please. I've tried to answer some of the advice I've had embedded in this update.</p><p></p><p>I torqued the heads down myself a couple of months ago, there is no sign of anything blowing out, they are as clean as a whistle and I have good compression - so I think that there is a good seal (although I don't think I have the modified gaskets fitted!!).</p><p></p><p>I stripped and cleaned the float bowl assembly - all spotless and back together again, level right and does not flood.</p><p></p><p>I went back to the original plugs that were in the bike when I got it, a 5 in the rear pot and a 6 in the front. BUT this time I swapped them to see if I could get it to clear and put the 5 in the front. I left the rear on the NGL 7 that I've been running for 200 mils or so. I thought that the 5 would run hotter and help it clear itself (of all the muck I may have left in there by running for 10 miles on a snapped throttle cable with the plug left in and connected).</p><p></p><p>I spoke to Pazon (ignition manufacturers) to see if it was possible I had damaged the electronic ignition system with what I have been doing (lifting a plug lead) - they were very helpful and confirmed that on electronic ignition you should never lift the plug lead without grounding it as the electrical spike has no-where to go and may find its way back into the control module, they suggested a range of checks which I did, the final one being to swap the ignition leads over and run the front cylinder with the rear cylinder lead - I did this and the bike ran fine in the garage with no difference which way round the leads ran - so seems OK.</p><p></p><p>Then I took the bike out tonight for a 50 miles run. Results as:</p><p></p><p>I did the first 20 on the M40 Westwards at a steady 50-60 mph with the bike running clean. When warm, some lengthy bursts up to 80+ to blow it through. I felt it was doing slightly more work on the rear cylinder so I stopped when I pulled off the Motorway and adjusted the throttle cable slightly and it ran much better, feeling smoother and running beautifully well balanced and pulling strongly.</p><p></p><p>I stopped and filled up with fuel - unleaded just like normal and from a garage that I have used before. I then did 20 miles of A and B roads – ran perfectly, actually better than I can recall for some time, just tootling along in 4th at 40mph rolling on and off the throttle – very, very smooth, sounded superb exhause note and if I shut the air slide on either cylinder I choked the engine, open it again and it pulled clean.</p><p></p><p>Last 10 miles were in light traffic on the route back home – 30/40mph – by the time I got home running lumpy again, on and off the front cylinder and when I pulled the plug at home it is as black and sooty as it has been once again.</p><p></p><p>The rear cylinder I left a NGK 7 in it, looks fine when I pull the plug, slightly black outer edge and the central section mid-brown.</p><p></p><p>Next I think a proper strip and clean of the front carb is called for, so at least I know that has been done and can be discounted.</p><p></p><p>Any other thoughts or advice welcome?</p><p></p><p>Stuart</p></blockquote><p></p>
[QUOTE="BlackLightning998, post: 4459, member: 109"] [b]Latest update - any more thoughts?[/b] Evening all, Here is the latest update for consideration and any more advice please. I've tried to answer some of the advice I've had embedded in this update. I torqued the heads down myself a couple of months ago, there is no sign of anything blowing out, they are as clean as a whistle and I have good compression - so I think that there is a good seal (although I don't think I have the modified gaskets fitted!!). I stripped and cleaned the float bowl assembly - all spotless and back together again, level right and does not flood. I went back to the original plugs that were in the bike when I got it, a 5 in the rear pot and a 6 in the front. BUT this time I swapped them to see if I could get it to clear and put the 5 in the front. I left the rear on the NGL 7 that I've been running for 200 mils or so. I thought that the 5 would run hotter and help it clear itself (of all the muck I may have left in there by running for 10 miles on a snapped throttle cable with the plug left in and connected). I spoke to Pazon (ignition manufacturers) to see if it was possible I had damaged the electronic ignition system with what I have been doing (lifting a plug lead) - they were very helpful and confirmed that on electronic ignition you should never lift the plug lead without grounding it as the electrical spike has no-where to go and may find its way back into the control module, they suggested a range of checks which I did, the final one being to swap the ignition leads over and run the front cylinder with the rear cylinder lead - I did this and the bike ran fine in the garage with no difference which way round the leads ran - so seems OK. Then I took the bike out tonight for a 50 miles run. Results as: I did the first 20 on the M40 Westwards at a steady 50-60 mph with the bike running clean. When warm, some lengthy bursts up to 80+ to blow it through. I felt it was doing slightly more work on the rear cylinder so I stopped when I pulled off the Motorway and adjusted the throttle cable slightly and it ran much better, feeling smoother and running beautifully well balanced and pulling strongly. I stopped and filled up with fuel - unleaded just like normal and from a garage that I have used before. I then did 20 miles of A and B roads – ran perfectly, actually better than I can recall for some time, just tootling along in 4th at 40mph rolling on and off the throttle – very, very smooth, sounded superb exhause note and if I shut the air slide on either cylinder I choked the engine, open it again and it pulled clean. Last 10 miles were in light traffic on the route back home – 30/40mph – by the time I got home running lumpy again, on and off the front cylinder and when I pulled the plug at home it is as black and sooty as it has been once again. The rear cylinder I left a NGK 7 in it, looks fine when I pull the plug, slightly black outer edge and the central section mid-brown. Next I think a proper strip and clean of the front carb is called for, so at least I know that has been done and can be discounted. Any other thoughts or advice welcome? Stuart [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Request for advice - Rapide 276 Carburettors
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