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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
600cc Comet Carbie?
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<blockquote data-quote="davidd" data-source="post: 77500" data-attributes="member: 1177"><p>Harry,</p><p></p><p>I remember the conversations we had and it is nice to hear that you are doing well.</p><p></p><p>Are you trying to get it to start better or are you just trying for more performance? </p><p></p><p>The more you are able to retard the ignition, the better the power, but nobody makes an ignition that allows you to do this easily. All motorcycle electronic ignitions are made with automobile chips, as far as I know. Many retard the spark a huge amount (set by the supplier of the ignition when he programs the chip) and if you try to tune your engine, the retard can drop back below TDC. The supplier usually will not set the ignition where you want it, but they will often disable the retard as an option before you purchase the ignition. You may be on the edge of this phenomena, but there may be other reasons also. </p><p>Based on what you have mentioned, it sounds like you are on the right track. I know nothing of the Dellorto, but Terry's heads are a copy of the Factory big port heads which were designed for a 36.5 mm carb. So, 36 mm sounds fine and 38 mm might work well also, but the starting may suffer a little more as you continue to go bigger, because the flow tends to slow down as the size goes up. I am wondering if the carb is preventing a better start. In other words, are you getting the plug wet or is it quite dry after you have kicked it a few times and it has not started. It might be worth pulling the plug out some time and seeing if it is wet or dry.</p><p></p><p>A lot of owners like a 48T sprocket on the rear of a twin and a 50T on the rear of a Comet. This is usually a lot better in traffic, but you may feel you do not need that with the 600. You might try a 48T and see if you like it better, if you have not done so already.</p><p></p><p>I have forgotten what cam you are running, but the MK2 will make starting difficult also. Greg Brillus can attest to this.</p><p></p><p>All the best,</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 77500, member: 1177"] Harry, I remember the conversations we had and it is nice to hear that you are doing well. Are you trying to get it to start better or are you just trying for more performance? The more you are able to retard the ignition, the better the power, but nobody makes an ignition that allows you to do this easily. All motorcycle electronic ignitions are made with automobile chips, as far as I know. Many retard the spark a huge amount (set by the supplier of the ignition when he programs the chip) and if you try to tune your engine, the retard can drop back below TDC. The supplier usually will not set the ignition where you want it, but they will often disable the retard as an option before you purchase the ignition. You may be on the edge of this phenomena, but there may be other reasons also. Based on what you have mentioned, it sounds like you are on the right track. I know nothing of the Dellorto, but Terry's heads are a copy of the Factory big port heads which were designed for a 36.5 mm carb. So, 36 mm sounds fine and 38 mm might work well also, but the starting may suffer a little more as you continue to go bigger, because the flow tends to slow down as the size goes up. I am wondering if the carb is preventing a better start. In other words, are you getting the plug wet or is it quite dry after you have kicked it a few times and it has not started. It might be worth pulling the plug out some time and seeing if it is wet or dry. A lot of owners like a 48T sprocket on the rear of a twin and a 50T on the rear of a Comet. This is usually a lot better in traffic, but you may feel you do not need that with the 600. You might try a 48T and see if you like it better, if you have not done so already. I have forgotten what cam you are running, but the MK2 will make starting difficult also. Greg Brillus can attest to this. All the best, David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
600cc Comet Carbie?
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