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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Tuning - Original Comet Carb and LM-1 AFR Meter
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<blockquote data-quote="Pharquarx" data-source="post: 13959" data-attributes="member: 1536"><p>Ok. Here is where I am. Inspected the inlet and the exhaust systems for leaks. The inlet was tight, but the exhaust was leaking at the head to exhaust pipe interface. I took the bike down to Welding Works, they spent about three days correcting the exhaust pipe (correct flanging and diameter, correct geometry for a square interface between the head and the exhaust pipe). The fit up now requires only a single copper exhaust washer/gasket. Went back and set the carb needle midway (the needle is a little bent, but moves freely) and while I was at it, cleaned the internals at the float chamber. There was some permatex goo present and attached to the lower bolt which may explain the difficulty in setting and idle (it would tend to wander - maybe the goo would flow in and restrict some passage and then move out and let the flow through). Once reassembled, the first thing that the carb did was flood.</p><p>Set up the air to fuel ratio meter again with the modifications to the sample probe discussed previously. The idle was easy to set now and is pretty steady. Best I could do during these tests was 16.1 afr, which is still lean.</p><p>I will go get the larger jets, a new needle and a new float needle. I also have a K&N air filter that I am going to fit up also, one for protection and two, it may swing the mixture to a little more rich.</p><p>More will be revealed.</p></blockquote><p></p>
[QUOTE="Pharquarx, post: 13959, member: 1536"] Ok. Here is where I am. Inspected the inlet and the exhaust systems for leaks. The inlet was tight, but the exhaust was leaking at the head to exhaust pipe interface. I took the bike down to Welding Works, they spent about three days correcting the exhaust pipe (correct flanging and diameter, correct geometry for a square interface between the head and the exhaust pipe). The fit up now requires only a single copper exhaust washer/gasket. Went back and set the carb needle midway (the needle is a little bent, but moves freely) and while I was at it, cleaned the internals at the float chamber. There was some permatex goo present and attached to the lower bolt which may explain the difficulty in setting and idle (it would tend to wander - maybe the goo would flow in and restrict some passage and then move out and let the flow through). Once reassembled, the first thing that the carb did was flood. Set up the air to fuel ratio meter again with the modifications to the sample probe discussed previously. The idle was easy to set now and is pretty steady. Best I could do during these tests was 16.1 afr, which is still lean. I will go get the larger jets, a new needle and a new float needle. I also have a K&N air filter that I am going to fit up also, one for protection and two, it may swing the mixture to a little more rich. More will be revealed. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Tuning - Original Comet Carb and LM-1 AFR Meter
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