Poor Mpg

Discussion in '6th Generation 2002-2013' started by urby, Oct 29, 2019.

  1. urby

    urby New Member

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    Hey all I'm new here so Hi. Just picked up an 02 800 29k milage. Bought it from third owner who had loads of money but didn't really know bikes. He had a custom Harley chopper and more cars than Barrett Jackson. He bought this to try out a sportbike back in 16 but only put 200 miles on it since then. Georgia title and vin search proved it.

    So he put a gallon of gas into the 3 year old gallon (2 bars on the guage). It started and ran fine. No smoke on startup or riding.

    My first thought is this thing needs fresh gas. Filled up with 91 octane and topped off with Lucas upper cylinder injector cleaner. Proceded to tear the bike down. Oil, 50/50 vinegar flush, chain and sprockets, brake fluid/bleed. Replaced with Honda fluids.

    Bike runs and starts great but my mpg is way less than the 40 it should be getting. Have since run another tank of gas through her thinking if any cramp was going to be discharged, now would be the time to do it before I replace $60 worth or iridium plugs.

    Also as the tank has been full and I'm waiting to run it down so I can get under the lid, I'm thinking owner 1 or 2 put in a K&N filter or equivalent. I'll clean that too.

    My question is, while the the lid is up, should I be looking for anything other than the usual cracked vacuum lines,etc?

    I've heard the PAIR mod can also screw up mapping. How can I tell if this has been done.

    T stat seems fine as it ran at 215 when I drove it home (it was 95 in Phoenix that day). Since the flush and new fluids its been running 177 when its 70 degrees. Long trips, 1.5 hours or more.

    Lmk your thoughts guy/gals. Thank you!

    Michael
     
  2. OOTV

    OOTV Member

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    I would suggest a real fuel injector cleaning, not the run in the tank stuff. I had mine done professionally and although they were not too bad the difference was immediately noticeable. Of course air filter cleaning and new plugs wouldn’t hurt, I think you’d be surprised what clean injectors will do. All of the other stuff you have done is actually what I would have also suggested too BTW.

    As for the PAIR valve removal, there are hoses that go from the top of the cylinder head covers to the air box via a set of hoses/valve controller. Some folks remove the entire system and will block off the inlets on the cylinder heads by removing the cap with the hose port and use a block off plate. Others will leave the system intact but plug the hoses with large marbles and disconnect the electrical connection to the valve. Either way you should be able to tell with a little investigation once you tilt the tank up.

    Once the tank is up, you should be able to see the condition of the vacuum hoses, depending on how well taken care of the bike has been, the hoses may not be in too bad of shape. My 01s hoses are not bad at all but in all honesty my next service when I will change the oil and coolant, I’ll probably get around and change them out.
     
  3. Terry Smith

    Terry Smith Member

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    Seems like lots of critters like to make comfy winter nests in the airbox of bikes that are seldom ridden; that ruins the airflow and I assume would imapct on fuel use too. Once you get the airbox open maybe the mystery will be solved.

    Anothe cause of high fuel consumption is the fuel pressure regulator; the fuel pump provides excess pressure and the regulator controls this to the injectors. There is a vacuum signal to one side of the FPR so that the pressure difference relative to the intake pressure is kept constant, if that is lost (e.g. leaky vacuum hose, or damaged diaphragm in the FPR) then the relative fuel pressure will be higher than intended so more fuel gets injected with each pulse. So check the vacuum line to the FPR is solid, and also look for any liquid fuel in that line which would signal a diaphragm fault.
     
  4. Evolver79

    Evolver79 New Member

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    ^^^ This^^^ My fuel mileage was getting worse the more I rode. It started stalling at idle. I replaced the fuel regulator along with new plugs, & “the drill” now my mpg is 40+
    New OEM regulator is around $40.
     
  5. urby

    urby New Member

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    Thanks for all the feedback guys
    I guess once I get under the lid well see what I've got. I'll post up when I find something out.
     
  6. urby

    urby New Member

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    Alright guys, here's the quick skinny. Been laid up for a couple weeks with degenerative discs in 4,5,6 in my neck. Just got my 10 month epidural fluid change ( injections) so I'm good now.

    Day before I had to take some time off of work got my Metzeler Roadtechs mounted but have not yet installed. Was going to Plastidip the wheels in Brassmonkey (dark bronze/gold). That will wait. I'll slap my new skins on and ride on my Tuesday and Wednesday days off as the weather in Arizona is perfect now and as stated my neck should again be good for about 10 months.

    On to the mpg stuff. Upon pulling the tank while still recovering from outpatient surgery, I found what looked to be the original stock Honda air filter. Omg, someone spent the money to put a performance exhaust (Staintuned) that probably cost 1k even in 02 and never addressed the intake. Like they worked it backwards....go figure.

    Anyway, no critters in the box at all but the filter was so gunked I could barely see light while holding it up to my led worklight.

    My new K&N should be here tommorow and I'm thinking this will probably rectify everything. Vacuum hoses looked perfect and no fuel in regulator hose. I'm going to hold off on plugs for a while as they are pricey and trickey to get a couple in. Also the NGKs iridium have a 60k lifespan so I'm pretty sure the filter will do it.

    I'll let you guys know in a few days. I should have at least a tank and a half through her by then.

    Thanks again all!
     
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  7. urby

    urby New Member

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    BTW OOTV, Love the avatar. My little girl passed a couple months ago and that just made me laugh.

    I work for the railroad with big burley tough mf'ers and they still bust my chops about the cat thing lol.
     
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  8. OOTV

    OOTV Member

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    What Railroad? My grandpa (rest in peace) and a couple of my cousins worked for Southern Pacific. The latter two recently retired.

    Losing a pet can be just as hard as losing a human, sometimes more so. My wife had a harder time when her dog of 14 years passed away than she did when her cousin passed. Similar for me and a few of the cats and dogs I have lost, they are family members and often are more loving and appreciative than humans can ever be! OK, now I'm starting to tear up...:)
     
  9. urby

    urby New Member

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  10. urby

    urby New Member

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    It's all good brother. I appreciate the sympathy. Guys at work f with me but they knew it hit me hard.

    I'm 53, single and have had my share of trophies lol so I ain't in no hurry to hook up.... too much to lose. All my co workers are either in or been divorced and I laugh when they gave me shit about Peaches (my kitty..more dog than kitty).

    I bust em up and say hey my house, truck, bike is all paid in full and I don't have to ask to do anything. I'm 53 and had my share of trophy girls. Too much baggage comes these days but I'm still open if it happens.

    So to Peaches, my lovely little girl,, yeah she passed about 5 months ago. A sweet little 3-4 pounder (tiny), but here thick for belied her.

    Adopted her after my midwest feral kitten adopted Cinnamon passed. Peaches (shelter name Buttercup) was more a little dog than cat. Followed me everywhere, jumped in bed next to me ad soon as she heard me hit the sack (I don't even know how she heard me from the next room in her basket to know I had crawled into bed).. Just a pure little piece of joy in my otherwise chaotic life.

    Anyhow, I work for TTX, Were like the Avis rent a car for the big six in North America. My present gig as a railcar repair specialist has me subcontracting for BNSF who owns all the property and my ramp.

    So we lease 275k railcars to the six major rr's in in north America, Canada north to Mexico south..

    Trains roll in need to get inspected for defects that could cause performance derail issues. We regularly change wheels, couplers ,knuckles,, transoms, break beams, etc.

    Good job with Cadillac bennies. My total take home is huge. My benies far exceed my pay lol.

    My second journeyman card. I'm local 6011 now but prior was ibew 134 electrician for 25 years. Wish I found this gig years earlier I'd retire multimillionaire

    All per FRA/AAR guidelines.
     
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  11. urby

    urby New Member

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    Hey so I got another quickie for you. Off topic twice lol. Any experience using the Auxbeam h4s in my 02. Same as what I got in my 16 Colorado. Are they gonna pulse or behave nicely
     
  12. urby

    urby New Member

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    1219171415.jpg
     
    One Ida 31 and OOTV like this.
  13. OOTV

    OOTV Member

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    Never used them, still have OEM bulbs in my 09 and 01. I can say if you haven’t already updated/upgraded the RR, look into it before changing anything electrical. Since these bikes like to fry the stator and RR, I’d definitely recommend looking into it. Check out the kits that Roadstercycle.com has, the SH847 might be the way to go if you’re planning on changing to LED headlights.
     
  14. urby

    urby New Member

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    Was already looking into the upgrade to make the bike bulletproof. Thanks for the recommendation.
     
  15. signal

    signal New Member

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    Just curious, did changing the filter fix everything?
     
  16. urby

    urby New Member

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    Hi signal. Yes the milage did did improve but it seems the Power Commander V improved it even more and made the power curve more linear with a little more low end grunt.
     
  17. urby

    urby New Member

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    They had a map on the Dynojet site that matched my setup (Staintuned w/o baffles, K&N with no other mods). They also said not to bother with the pair/flap mods as the tune was set up for maximum performance/milage on an otherwise stock platform based on which map/tune you select when you load it into the PCV.

    Probably will still do fuel reg at some point because I still seem to be around 35 mpg combined. That could also be my riding style as well. Were I do most of my riding is desert unpopulated so I tend to ride her a bit aggressively.

    Hope this helps and thanks to everyone else who posted! Stay safe and healthy everyone!
     
  18. urby

    urby New Member

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  19. urby

    urby New Member

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  20. Diving Pete

    Diving Pete Insider

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    Don't worry too much about the milage - I drive generally like a criminal & am very lucky to reach 130miles from 20 litres in my weekly short commute. But if I go on a trip then 220m is easy @ 80mph.. Its more about where you keep the rpms, I love 8-10k as I'm lugging 4 valves a cylinder so want to use them - lol. Mine is a 2008
     
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