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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Friendly chap with huge kickstart foot required!
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<blockquote data-quote="Phil Baker" data-source="post: 32912" data-attributes="member: 2693"><p><span style="font-size: 22px"><span style="font-family: 'times new roman'">OK, I'm going to summarise what's been done to my Comet so far and hope that I'm just thick and have forgotten something obvious:</span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'"></span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'">The taps are sending plenty of fuel to the carbs. The fuel lines are ethanol-proof. I have just chucked out the timing light idea and retimed at 4 deg BTDC fully retarded on the firing stroke with a 1 thou feeler gauge to show when the points open. I got a new float and float chamber with the recently-acquired 229 carb but hadn't used them because the outer casing of the chamber had a rust mark I've now used the new carb float and that has stopped the perpetual dripping. Fuel is still getting to the carb - slight weep from bottom carb big ring confirms that.</span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'"></span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'">Cylinder head has been completely redone by Clever Trevor.</span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'"></span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'">Bore, piston and rings have been checked and approved by Brian Parsons.</span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'"></span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'">Cylinder head has been ground onto liner and barrel.</span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'"></span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'">TWO gudgeon pin circlips have been fitted.</span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'"></span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'">Fuel in really very recent unleaded. Spark plug is sparking in a healthy manner. HT lead is copper. Sparkplug cap is non-resistor type. Tank is steel and not rusty inside. </span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'"></span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'">HT lead is copper core and well-soldered. Produces a healthy blue-white spark at the plug.</span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'"></span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'">Sparkplug is new.</span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'"></span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'">Carb : new 229 with clear jets, 1 and 1/4 turn out mixture screw. Choke works. </span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'"></span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'">Valve timing - both valves are closed at TDC on the firing stroke.</span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'"></span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'">Ignition timing - points open on the firing stroke at 4 deg BTDC.</span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'"></span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'">The bike is now spitting back out of the carb sometimes and firing in the silencer at other times.</span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'"></span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'">I am running out of ideas, knees and tears!</span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'"></span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'">Phil</span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'"></span></span></p><p><span style="font-size: 22px"><span style="font-family: 'times new roman'"></span></span></p></blockquote><p></p>
[QUOTE="Phil Baker, post: 32912, member: 2693"] [SIZE=6][FONT=times new roman]OK, I'm going to summarise what's been done to my Comet so far and hope that I'm just thick and have forgotten something obvious: The taps are sending plenty of fuel to the carbs. The fuel lines are ethanol-proof. I have just chucked out the timing light idea and retimed at 4 deg BTDC fully retarded on the firing stroke with a 1 thou feeler gauge to show when the points open. I got a new float and float chamber with the recently-acquired 229 carb but hadn't used them because the outer casing of the chamber had a rust mark I've now used the new carb float and that has stopped the perpetual dripping. Fuel is still getting to the carb - slight weep from bottom carb big ring confirms that. Cylinder head has been completely redone by Clever Trevor. Bore, piston and rings have been checked and approved by Brian Parsons. Cylinder head has been ground onto liner and barrel. TWO gudgeon pin circlips have been fitted. Fuel in really very recent unleaded. Spark plug is sparking in a healthy manner. HT lead is copper. Sparkplug cap is non-resistor type. Tank is steel and not rusty inside. HT lead is copper core and well-soldered. Produces a healthy blue-white spark at the plug. Sparkplug is new. Carb : new 229 with clear jets, 1 and 1/4 turn out mixture screw. Choke works. Valve timing - both valves are closed at TDC on the firing stroke. Ignition timing - points open on the firing stroke at 4 deg BTDC. The bike is now spitting back out of the carb sometimes and firing in the silencer at other times. I am running out of ideas, knees and tears! Phil [/FONT][/SIZE] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Friendly chap with huge kickstart foot required!
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