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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Starting Procedure Twin…Using Chokes or Not?
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<blockquote data-quote="greg brillus" data-source="post: 161285" data-attributes="member: 597"><p>Carl, some engines (twins) are easy to start and others are difficult.........my Rapide has original 276 side bowl carby's, 8:1 pistons new type BTH mag, and some type of high lift/duration cams........these have more duration than Lightning cams........My engine starts well hot but can be a bitch from cold.......I found for a while that I was actually giving the engine too much fuel on a cold start, so you have to go with either no chokes and tickle the bowls, or use the chokes and do not touch the ticklers........I cycle the engine over with the decomp lever but only using it to go past TDC then release it so it can draw fuel in........I feel if you hold the decomp lever in and hold it there whilst turning the engine, this will achieve nothing, as with the exhaust valve lifted off its seat, the piston will draw air back in from the exhaust port. I am 100% convinced that most all engines that are hard to start, and have good carby's and ignition set up and tuned well, that the issue is in the cams.......and/or their timing......I have tried different coil ignitions on mine hoping it would start easier, but this made no difference at all....... The spark from the new BTH mags is not that great at kicking speed, but i'm not convinced that this is affecting mine to any great amount........the problem with big cams is in the overlap........this causes a big portion of the intake charge to be pushed back out of the carby, then this actual "double charge" gets sucked into the engine and is actually very rich.........it is finding a good balance of not enough fuel verses too much fuel.........try turning the fuel taps on, close the chokes.......do not touch the ticklers at all........cycle the engine over a few compressions, then fully kick.......once it fires, then pull the choke levers back to clear the engine.........try not to open the throttle too much as you come down on the k/s lever, this is especially important on a hot engine........these engines like almost nil throttle when starting from hot, as an open throttle leans the mixture out too much........good luck with it.......Cheers. ...Oh one other notable point.......Thick oil makes kicking over a cold engine much more difficult.......I run a 15W/40 Diesel oi in mine and this allows the engine to spin over much better from cold.........thick oil will definitly make the engine much slower to turn.........4 main bearings and all that drag.......all good.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 161285, member: 597"] Carl, some engines (twins) are easy to start and others are difficult.........my Rapide has original 276 side bowl carby's, 8:1 pistons new type BTH mag, and some type of high lift/duration cams........these have more duration than Lightning cams........My engine starts well hot but can be a bitch from cold.......I found for a while that I was actually giving the engine too much fuel on a cold start, so you have to go with either no chokes and tickle the bowls, or use the chokes and do not touch the ticklers........I cycle the engine over with the decomp lever but only using it to go past TDC then release it so it can draw fuel in........I feel if you hold the decomp lever in and hold it there whilst turning the engine, this will achieve nothing, as with the exhaust valve lifted off its seat, the piston will draw air back in from the exhaust port. I am 100% convinced that most all engines that are hard to start, and have good carby's and ignition set up and tuned well, that the issue is in the cams.......and/or their timing......I have tried different coil ignitions on mine hoping it would start easier, but this made no difference at all....... The spark from the new BTH mags is not that great at kicking speed, but i'm not convinced that this is affecting mine to any great amount........the problem with big cams is in the overlap........this causes a big portion of the intake charge to be pushed back out of the carby, then this actual "double charge" gets sucked into the engine and is actually very rich.........it is finding a good balance of not enough fuel verses too much fuel.........try turning the fuel taps on, close the chokes.......do not touch the ticklers at all........cycle the engine over a few compressions, then fully kick.......once it fires, then pull the choke levers back to clear the engine.........try not to open the throttle too much as you come down on the k/s lever, this is especially important on a hot engine........these engines like almost nil throttle when starting from hot, as an open throttle leans the mixture out too much........good luck with it.......Cheers. ...Oh one other notable point.......Thick oil makes kicking over a cold engine much more difficult.......I run a 15W/40 Diesel oi in mine and this allows the engine to spin over much better from cold.........thick oil will definitly make the engine much slower to turn.........4 main bearings and all that drag.......all good. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Starting Procedure Twin…Using Chokes or Not?
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