In other words it needed a carb clean! On Dec 10, 2012, at 7:18 PM, Rmj wrote:
> Meant to get back to you on mpg but have been traveling for work. My '92 750 > had issues did not get but 35 mpg & would only idle with the choke set around > 1/4 - 1/2 shut. I ran 1 complete can of seafoam to a full tank of gas, 1 fill > up after the other, 2 tank fills only. That cleared a majority of the issues. > After that a ran 1/2 can of seafoam every other fill up - 2 can only. Now I > probably use 1/2 can once every other month. > From: Hawaii Sean > Sent: 12/10/2012 5:50 PM > To: [email protected] > Subject: [Nighthawk Lovers] Re: 2000 Nighthawk 750 Low Milage issue > > Wow - great detail and I'm going to play with my choke just to see how it > works. > > Like everyone else I recommend changing the Oil and Oil Filter. Take a good > look at the Air Filter and at a minimum make sure it's clean and if you can > blow compressed air through it. If you don't have access to a compressor the > cans will work fine. You'll also find a plastic tube coming out of the > bottom of the air box, it will have a cap on the end sticking down just below > the frame on the right side further back than the clutch. Pull the plug off > and let it drain - caution nasty stuff will come out so have something you > can throw away under it. Let all this drip out and then replace the plug. > This tube is to drain liquid out of the air box. cleaning it out once every > 10,000 miles is a good idea. > > Your millage should be in the low 40's. I have a 12 mile commute in traffic > and get 42 to 44 miles to the gallon. Only 2 miles on the highway, the rest > are 35MPH surface streets. When on the "highway" for extended periods (I > live in Hawaii on Oahu, an extended period is about 30 miles) I get 50mpg if > not more. > > Best of luck and enjoy your bike. > > Sean > > > > On Monday, December 10, 2012 1:02:45 AM UTC-10, surfswab wrote: > First suggestion, buy a service manual. Clymer's a good one. > > Second, fewer than 40 mpg in constant stop/go traffic is fairly > normal, but almost half that is not. > > Sounds like the engine is running rich. Are you mindful of turning > choke off after warmup? If so, problem may be deeper. Try pulling > the spark plugs and inspecting them. If they are sooty black or wet > with gas that would confirm a rich mixture and might indicate a need > for air/fuel mixture adjustment. > > Also check the choke cable for proper adjustment. Follow the cable > visually from the handlebars to the connection at the left side of the > motor. A two-finger fork style fitting at the end of the cable > operates brass pins built into the tops of the carbs. > > With the engine off, move your choke lever from full on to full off > and observe the operation of those pins (you'll probly be able to see > only one of them. The rest are connected by a rod across all four > carbs). If the choke is operating correctly, the brass pins should > almost disappear into the carb bodies when you turn the choke off. > With the choke full on, you should see about a quarter-inch of brass. > Use your new service manual for adjustment procedures if needed. > > I'd suggest new plugs in addition to a new air filter and oil change > as already mentioned. Sniff the oil to make sure there's no gas smell > coming from it. And empty blowby gases/water from the clear plastic > tube hanging down from the frame, under your right foot peg (it has a > plastic plug in the end) > > Balancing the carbs wouldn't hurt either (service manual, again, for a > description of the procedure). > > The motor was designed to run on regular gas, so switching to higher > octane would have no affect unless it's pinging or dieseling. > > Before you put a wrench to it, though, try a weekend 100-150 mile, > open road (non-stop/go) run to see if you're mileage figures improve. > Should be in the low-mid 40s -- more, if you ride sedately, less if > you don't. > > > > On Dec 9, 6:07 pm, Sanna <[email protected]> wrote: > > Hello > > > > Bought a 2000 NightHawk 750 3 months back. Been using to commute to work > > about 15 Miles both ways, stop and go City traffic. Noticied I am getting > > about 22-26 Miles a gallon. Switched to 93 Premium grade gas, almost same > > thing. Please advise. I was hoping to get about 40 miles per gallon in the > > City. I want to go for long rides / cross country during Summer. > > > > Your suggestions and advise is very much appreciated. Thank you. > > -- > 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]. > Visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en-US. > > > > -- > 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]. > Visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en-US. > > -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. 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