The Irish Crew
Mine always whooshes when I open the cap. I get between 35-42mpg even with all the crapanol that's in the fuel these days.
What was the colour like of the old spark plugs?I have run none ethnolo gas , straight up gas, high octane gas with no difference at all in mileage. I have put around 8000 miles on the bike since July and have run at least 12 cans of seafoam through it. I have no idea what else to try. Air filter ,fuel filter, spark plugs all new 5000 miles ago, now I have not checked the sub filter? What does it do? I am thinking the carbs either need to be synced or have a carb job done. New tires 5000 miles ago 41 in fron 42 in back. Help I am at wits end.......no gas smell from the exhaust.
Dont know but I ride the 91 and seem to do 39mpg on commutings. On highway I have to go faster and economy goes bad. A 6th gear would be sweet.I feel for you on 32 mpg, I had a 91 1500A that got 32mpg I did every thing,had the carbs worked on twice, all filters, plugs.no brakes dragging every thing and 32 was all I got 60 mph on hwy. I sold it and got a 2000GL1500 se and got 37 to 41 to this day don't know why the 91 gw did so bad
I get the same mileage with Denso and NGK plugs. I used Fram filters on my cars and my CB750 for years without a problem.Ok
I have had 2, 1500 wings a 93 and the 96 I drive now. Yes the first thing I did with both is change the spark plugs. But make sure you use NGK plugs it will make a difference. I use DELO 400 oil, one had the K&M oil the filter the 96 has paper. Up on the right under the plastic is the Sub Filter and on the left just about the same place is the Cruise filter. Both are around $4.00 I changed them on both bikes and both were bad. In both cases I pulled the Radio off and the air filter shelter, I sprayed carb cleaner into the intakes and mad sure nothing was sticking the slide was sticking on the 96. I checked all the vacuum hoses and replaced one on the 96 dry rot and it was leaking just a little but who cares replaced it anyway. I went through and cleaned and tightened all the ground connections I could find. The main one is under the radio shelter on the right side big wires attached to the frame. Found rust there so cleaned it up and retightened the bolt. Afterwards I coated the entire area in some heavy grease.
Vaccuum leaks will cost you milage they are sneaky and will only get worse over time. So check all the hoses if any look even slightly off replace them. The cost of the hoses will be easily made up in gas saved.
Only use NGK spark plugs no matter how many times I say it somone will use autolite then complain about gas milage and preformance issues.
Never use Fram oil filters Cyclemax as well as others sells good ones for 5 or 6 dollars. I buy them 6 at a time that way the shipping doesn't make me groan...
To much of a good think can hurt you so after saying that I put a whole can of Seafoam in the tank in the Spring the second goes in the tank in August.
Every 15th tank (GIVE OR TAKE) of gas I use I fill up with Premium Gas and run it almost dry before adding regular to the tank.
All in all I average right around 42 miles to the gallon on my bike and that is with Gail on the back. When riding long distance I use the cruise control as much as possible it will increase your milage. Front tire at 40 psi back at 42 psi. I also have one of those tall slipstreamer windshields and Gail likes it a lot. She says she gets no buffeting and no rain unlike with the shorter one I used to have. Gas milage has not dropped enough to matter.
So there you go The Purple Pirate has put in his 2 cents....