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Hello all,
It's been a while. After a first go-round of my full project build ('12-'13), riding it daily for almost a year, a secondary teardown for proper paint and odds (spring'14), it's now back together again.
I had the bike together and running strong last summer/fall (after the 2nd teardown) for about two months, ran into some carb problems/busy with life...let it sit for months, and finally made the time this weekend for a full carb overhaul and tune up.
yesterday, after a full carb cleaning/re-assymbly, sync, and mix screw adjustment close to where it was before 2 3/4 turns, the bike fired up first kick (3/4 choke), and idled nicely. After a few minute warm up, the bike ran strong for a 10 minute neighborhood cruise, pulled pretty strong, and only showed slight hesitation at take-off. This morning, I took it out for a slightly longer ride to make finer adjustments. It was pulling hard, decelerated smooth, and sounded good.
But, two blocks from the house I noticed more hesitation at two stop signs before pulling into the driveway.
pull the plugs to check for signs (I had cleaned them while doing the carb work).
left plug is completely black, not sooty, not really oily, just a satin-like black finish.
right plug looked fine but could probably use a slight mix adjustment.
the carbs are sync'd (yardstick) and mix screws set the same.
checked for spark with alligator clip and tester plug grounded to the fins. spark good outside of the cylinder.
I swap the L/R plugs and still the left side won't fire but the right side will with the fouled-up left plug.
next, I throw in two new NKG BP7ES plugs and still no spark on left side (bike still starts and idles).
Any thoughts?
old plugs NGK iridium BPR7EIX
NGK resistor plugs
bs34s with new butterfly seals last fall,
full teardown, clean, air compressor, reassembly.
I've had no spark on left cylinder before. Once was a improperly grounded pamco pickup, the other time was a faulty plug. This time, I'm lost.
any help is appreciated. and, it's good to be back even if for a frustrating problem.
these are brand new plugs results after 3-4 minute idle.
It's been a while. After a first go-round of my full project build ('12-'13), riding it daily for almost a year, a secondary teardown for proper paint and odds (spring'14), it's now back together again.
I had the bike together and running strong last summer/fall (after the 2nd teardown) for about two months, ran into some carb problems/busy with life...let it sit for months, and finally made the time this weekend for a full carb overhaul and tune up.
yesterday, after a full carb cleaning/re-assymbly, sync, and mix screw adjustment close to where it was before 2 3/4 turns, the bike fired up first kick (3/4 choke), and idled nicely. After a few minute warm up, the bike ran strong for a 10 minute neighborhood cruise, pulled pretty strong, and only showed slight hesitation at take-off. This morning, I took it out for a slightly longer ride to make finer adjustments. It was pulling hard, decelerated smooth, and sounded good.
But, two blocks from the house I noticed more hesitation at two stop signs before pulling into the driveway.
pull the plugs to check for signs (I had cleaned them while doing the carb work).
left plug is completely black, not sooty, not really oily, just a satin-like black finish.
right plug looked fine but could probably use a slight mix adjustment.
the carbs are sync'd (yardstick) and mix screws set the same.
checked for spark with alligator clip and tester plug grounded to the fins. spark good outside of the cylinder.
I swap the L/R plugs and still the left side won't fire but the right side will with the fouled-up left plug.
next, I throw in two new NKG BP7ES plugs and still no spark on left side (bike still starts and idles).
Any thoughts?
old plugs NGK iridium BPR7EIX
NGK resistor plugs
bs34s with new butterfly seals last fall,
full teardown, clean, air compressor, reassembly.
I've had no spark on left cylinder before. Once was a improperly grounded pamco pickup, the other time was a faulty plug. This time, I'm lost.
any help is appreciated. and, it's good to be back even if for a frustrating problem.
these are brand new plugs results after 3-4 minute idle.