I've been working on trying to get my CB350 with VM30's into reliable shape. (Uni pods, cheap shorty mufflers)
I had it at 20 pilot, 1 1/4 turns out, P5, 6F4 on top clip, 145 main. I took it around the neighbourhood for a few minutes to warm up (burbly at 5000), then put in new plugs to test the pilot circuit. The plugs from the warmup ride were completely carbon fouled black. After letting it run for 5 minutes on idle only, the left plug looks absolutely brand new and the right plug has a light tan to it.
So I turned the left air screw in to 1, leaving the right at 1 1/4 turns, and switched out the 6F4 top clip for a 6F5 bottom clip. After the neighbourhood warm up ride, my plugs look like this:
left
right
New plugs, after a 5 minute idle look like:
left
right
The left still looks lean on the pilot circuit, but the right looks pretty good? I was hesitant to have different idle screw settings, but I'm super hesitant to have different jets. Is there a point where a 25 pilot screwed out is similar to a 20 pilot screwed in?
But then the right looks lean from the warmup (when I go around the neighbourhood, throttle is between 1/4 and 1/2). It was black with a 6F4 leanest top clip, and it's going to clean white with 6F5 richest bottom clip. Is there something in between?
Thanks a ton,
John
I had it at 20 pilot, 1 1/4 turns out, P5, 6F4 on top clip, 145 main. I took it around the neighbourhood for a few minutes to warm up (burbly at 5000), then put in new plugs to test the pilot circuit. The plugs from the warmup ride were completely carbon fouled black. After letting it run for 5 minutes on idle only, the left plug looks absolutely brand new and the right plug has a light tan to it.
So I turned the left air screw in to 1, leaving the right at 1 1/4 turns, and switched out the 6F4 top clip for a 6F5 bottom clip. After the neighbourhood warm up ride, my plugs look like this:
left
![20170811_194017[1].jpg](/d2/attachments/193/193890-f2c4a02a7b32827105b13e7df92e9323.jpg)
![20170811_194048[1].jpg](/d2/attachments/193/193898-e52443d21b86921c2a586f30da77a3df.jpg)
New plugs, after a 5 minute idle look like:
left
![20170811_194114[1].jpg](/d2/attachments/193/193906-49a247ee1c6d5a8194a6502b4af9ad9c.jpg)
![20170811_194202[1].jpg](/d2/attachments/193/193914-4e2a5cc51706f422124a23fd74511fba.jpg)
The left still looks lean on the pilot circuit, but the right looks pretty good? I was hesitant to have different idle screw settings, but I'm super hesitant to have different jets. Is there a point where a 25 pilot screwed out is similar to a 20 pilot screwed in?
But then the right looks lean from the warmup (when I go around the neighbourhood, throttle is between 1/4 and 1/2). It was black with a 6F4 leanest top clip, and it's going to clean white with 6F5 richest bottom clip. Is there something in between?
Thanks a ton,
John