Thanks Dennis, compression is fine. I'll have to reinstall the carbs to see if the plugs are wet or dry after cranking. I assume I can adjust the throttle plates with the carbs on. Is that the idle screw underneath that makes that adjustment? Graham
On Feb 22, 2009, at 11:11 PM, Dennis Hammerl wrote: > I will assume your carb clean was a complete operation. Let's > examine how the choke works. The cable opens valves that will > permit raw fuel to be sucked into the motor during cranking. Now, > lets say that works fine.Your plugs should be wet after cranking > for a short while. Y-N ? The most common cause of the plugs being > dry after cranking is the throttle plates being open too far and > causing insufficient vacuum. Same as opening the throttle while > trying to start. When the intake air flow is too low, no fuel will > be drawn in from the choke circuit. If the plugs are wet, you're > flooding the motor. > We start here. Additional checks of compression and a leak-down may > be in order. > This may take time to resolve. Get at it. > > --- On Sun, 2/22/09, Graham Rogers <[email protected]> wrote: > From: Graham Rogers <[email protected]> > Subject: [Nighthawk Lovers] Nighthawk S starting problem > To: [email protected] > Date: Sunday, February 22, 2009, 6:18 PM > > I have a 1986 Nighthawk S. It ran before I got it but always took > starter fluid in the air filter to get it going. I pulled the carbs > and thoroughly cleaned them and used to compressed air in all the > holes. However the bike still will not start without stater fluid > and even then it takes along time with the fluid. I noticed that > using the choke seemed to make no difference at all so, thinking that > perhaps the choke isn't working at all I removed the carbs again > (they are terrible to remove) and did what I could toi ensure the > choke was working right. The mechanism moves as it should and I used > compressed air in the holes to the where I presume the > choke opens. > Now, before I reinstall the carbs, any suggestions? Could the > problem have been the choke or is there something else that would > cause the same problem. By the way, once the bike was warmed up, it > ran fine - just when it's cold I have to use starting fluid, Graham > > > > > > > > > > --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
