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1983 Honda CX650C with Murray's Carbs and stock exhaust for now
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Discussion Starter · #1 ·
Hello! Before anything else, here is what I have done/what I know. My ignition appears to all be stock except what is mentioned below. I have Murray’s carbs, fitted about 3 weeks before my first start up. I got a new battery from a trustworthy shop. I have resistor (DPR8EA-9) spark plugs, new wires, old boots with brass rods in them. I have a crappy tank that I red-kote treated to get me through until I have the bike running alright, then a new tank that isn’t rusty. Currently the exhaust is just the header pipes, nothing else until I get it running well, then the Murray’s pipes get added on.

I was having issues getting the right cylinder to run at all before brass rods, now it runs most of the time above 2k rpm. With choke my bike doesn’t idle, without it’s nigh impossible to start (all cold start). On a test ride today with choke on the bike seemed to only want to reach 5k and do nothing more. I don’t immediately suspect fuel, as I’ve run a filter between the tank and the splitter for carbs so as not to ruin those masterwork machines. Could my petcock possibly be too small of an outlet? It’s some eBay special that fit my tank. The ID of the outlet is 4mm or slightly more than 1/8 of an inch. Could it be electrical? Could it be how I installed the carbs? Pictures of things to follow.
 

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I doubt your petcock size has anything to do with it. Have you checked the resistance of your plug boots after doing the brass rod mod? Corrosion in there can still cause problems that the mod won’t fix.
 

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1983 Honda CX650C with Murray's Carbs and stock exhaust for now
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Discussion Starter · #4 ·
I doubt your petcock size has anything to do with it. Have you checked the resistance of your plug boots after doing the brass rod mod? Corrosion in there can still cause problems that the mod won’t fix.
I’ll give that a check now
 

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1983 Honda CX650C with Murray's Carbs and stock exhaust for now
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Discussion Starter · #5 ·
I doubt your petcock size has anything to do with it. Have you checked the resistance of your plug boots after doing the brass rod mod? Corrosion in there can still cause problems that the mod won’t fix.
Well shoot this may be easy. Read 460000 ohms on one and over 2M on the other. How do I clean out that corrosion?
 

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Try a small piece of scouring pad and a long and small screwdriver and get in there and scrub it. Spay some contact cleaner in there and scrub some more. I have done this on my bike a few times but it never seems perfect. I am going to order a new one one of these days.
 

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You might also snip a short piece of the end of the high tension lead then screw on the plug cap. Make sure that you have copper core leads.
 

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1983 Honda CX650C with Murray's Carbs and stock exhaust for now
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Discussion Starter · #10 ·
UPDATE: new plug boots and trimmed wires made a huge difference. Runs on both cylinders and idles (when the choke/ enrichener is off) lots of backfiring and pops at the moment. I have the quick build exhaust pile on order, and some sportster mufflers on the porch. Will the addition of more than just header pipes help all the popping?
 
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