Your plugs are indicating a lean condition.(ideal is somewhat brown) Not unexpected given being loose. Loose plugs do not transfer heat as they should. Effectively rendering them about one heat range more than they should be. It would appear that they all were firing. However, I will wait to see what you have to say about that. A 700s running on two out of four would be a very flat sounding, poor running thing. Do you have a spray carb cleaner ? Idle the motor and push the boots aside a tiny bit and spray a bit into each carb throat and observe the reaction. If it picks up or garfs a bit.
--- On Thu, 5/28/09, Dennis <[email protected]> wrote: From: Dennis <[email protected]> Subject: [Nighthawk Lovers] Re: 700SC carbs question To: [email protected] Date: Thursday, May 28, 2009, 11:17 PM Message Dennis, Thanks as always for sharing your advice. Tommorrow, I'll see which plug wires are sparking. I did use the strong light method of evaluating the butterfly valves and the one I adjusted was a better match when I was finished. I wondered if taking the cables off at the grips was the right thing to do to gain extra length. I didn't do it that way and it was a very tight business to do it the other way but, ultimately, it worked. Next time, I'll take the cables loose on the other end and make things easier. I just walked out and had another look and now I see where to connect the manometers. Does make a lot more sense than trying to connect them to the bottom of the float-bowls, eh <smile>? Dennis - Seattle -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: 28 May, 2009 19:53 To: [email protected] Subject: [Nighthawk Lovers] Re: 700SC carbs question The OEM exhaust is a balanced affair. So dismiss any thought of a diagnosis in that fashion. Please do check for spark at all plugs before we go tearing into anything else. When you have determined that, get back to me. The procedure to check out an ignition issue on a system like that is something that will take time to write out. Only if I have to. The vacuum take-off point is at the screws on the intakes. Same place as the vacuum take-off that is used for the petcock. The hoses are plugged into adapters on one, three and four, the petcock take-off on two. Understand ? You have to remove the screws and thread in adapters. Did you use a strong light to determine that a throttle plate needed to be moved ? Graham, the "pressed in jet" is not to be removed. There are only two. Remember to clear the slow speed jets with the .0011" wire. As far as R&R of the carb pack, it is best to start at the grip and remove the cables to insure enough slack at the carbs. The air box can be slid back quite far to allow space, just takes some effort. Liquid soap, WD-40, or silicone spray makes for a much easier time popping the boots and intakes off and on. Kyle takes the bolts out and pulls the intake manifolds out with the pack. I have no problem with that method. --- On Thu, 5/28/09, Graham Rogers <[email protected]> wrote: From: Graham Rogers <[email protected]> Subject: [Nighthawk Lovers] Re: 700SC carbs question To: [email protected] Date: Thursday, May 28, 2009, 10:17 PM I haven't put the carbs back on my 700SC yet - I'm afraid to! I put the carbs back on my CB750F and it ran like before! Graham On May 28, 2009, at 9:28 PM, Dennis wrote: Well, I finished putting my 700SC back together today and started it up - and it ran just as before. It feels like I have two cylinders firing and two not - but that's a guess - I haven't watched the spark plugs spark to prove it. I have the stock dual exhaust and it seems to me like both mufflers feel the same. So for either muffler, one cylinder's hitting and one's missing. Does that make sense? Dennis, I'm keen to focus now on the coils if you still think that's the most likly target to investigate, Can you tell me your thoughts again about how to test them out? I had a look at them today but I didn't see anything obvious like broken or shorted wires. Cheers! Dennis Gallagher - Seattle - '85 & '86 CB700SC --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en -~----------~----~----~----~------~----~------~--~---
