Author Fuel smell from exhaust and low mpg  (Read 2178 times)

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  • Offline Bikespod

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    Offline Bikespod

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    Fuel smell from exhaust and low mpg
    on: March 19, 2021, 11:23:15 pm
    March 19, 2021, 11:23:15 pm
    Mk1 CR Arrow exhaust

    I’m getting 110-120 miles before reserve in London traffic. That’s 27mpg or 6.5 miles per litre. Hope that’s right, maths isn’t my strong suit.
    I keep seeing mpg figures of high 30’s to low 40’s stated by others.
    I’m not riding like I stole it, but I do ‘enjoy’ the engine.

    When I start her up the exhaust really smells quite a bit of unburnt fuel. Makes me gag a bit if I get a nose full.

    I’d expect this on a cold start, but it does last a while. After a few miles it smells better.

    I’m wondering if I’ve got a stuck thermostat, but after starting the engine the radiator doesn’t start to get warm until it’s at 60-65 degrees on the dash, so thinking it is ok.

    When riding in cold weather the temp goes up to 80-85 deg and when stationary it will go up to 101-2 deg then the fan kicks in.
    Does this sound normal to how others bikes run?

    Apparently if the stat is stuck open, the bike doesn’t get up to temperature properly and the ECU adds fuel to get it running hotter?
    Is this true?

    One of the previous owners has disabled flapper valves and done the pairs mod. Just disconnected by the look of it.
    Maybe they didn’t block the pipe and this is confusing the ECU?

    I’ve read that if the pairs valves are disconnected they stay open and the 02 sensor thinks the engine is running lean so the ECU adds fuel to compensate.

    I’m probably going to fit proper blanking plates to do it all properly.

    Spark plugs are very new
    Haven’t checked air filter yet ( Sunday’s job ) but I believe it’s a K&N. Will clean and re oil.
    Also going to run some Seafoam through in case the injectors are gummed up a bit.

    Anyone have or had similar issues with smell and mileage? Any solutions?

    Something has to be messing up the mixture.
    I don’t think it’s a faulty fuel pressure regulator as the oil level hasn’t changed at all and this fault normally lets fuel seep into cylinders and past piston rings into the sump making the oil level creep up.

    Any ideas gratefully received

  • Offline Bikespod

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    Offline Bikespod

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    Re: Fuel smell from exhaust and low mpg
    Reply #1 on: March 21, 2021, 11:50:04 am
    March 21, 2021, 11:50:04 am
    Air filter is fine and K&N

    Pair valve deleted correctly. Everything removed and plugged.

    Can anyone test their Mk1 to see when RHS radiator starts to warm up ie at what temperature. Mine starts at 60-65

    Would like to rule out the thermostat possibility

    Thanks in advance

  • Offline Lars

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    Offline Lars

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    Re: Fuel smell from exhaust and low mpg
    Reply #2 on: March 21, 2021, 02:20:04 pm
    March 21, 2021, 02:20:04 pm
    Hello,

    I do not own a MK1 and cant test the temperature but I had a look at the service manual:

    https://www.vfrdiscussion.com/index.php?/files/file/260-2014-2015-vfr800f-rc79-8th-gen-service-manual/

    Page 8-7

    THERMOSTAT BEGIN TO OPEN:
    80.5 - 83.5"C (177 - 182"F)
    VALVE LIFT:
    8 mm (0.3 in) minimum at 95'C (203"F)
    Replace the thermostat if it responds at temperatures
    other than those specified.

    purely looking at the numbers and given the pretty narrow margin for tolerance of temperature it seems to me that if yours is opening up 20C earlier your suspicion might be valid.

    Lars

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    Re: Fuel smell from exhaust and low mpg
    Reply #3 on: March 21, 2021, 02:26:29 pm
    March 21, 2021, 02:26:29 pm
    Thanks Lars. The service manual is for 2014 onwards. Maybe there’s a difference between MK 1 and 2.
    I hope so as the stat is buried under the throttle bodies 😳

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    Re: Fuel smell from exhaust and low mpg
    Reply #4 on: March 21, 2021, 02:43:11 pm
    March 21, 2021, 02:43:11 pm
    I have a Mark 2. On mine the temperature gauge is a series of blocks. Once warm it settles at three blocks. One there it never alters; if it gets hot in traffic the fan cuts in and the gauge remains at three blocks. I’m not sure whether or not the fluctuations you are getting at varying temperatures once warm are normal for a mark one. I would have thought that it should behave like mine, the temperature only rising above normal in exceptional heat when the fan can’t control it fully. I might be wrong of course, not being conversant with the mark one.

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    Offline Lars

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    Re: Fuel smell from exhaust and low mpg
    Reply #5 on: March 21, 2021, 02:45:53 pm
    March 21, 2021, 02:45:53 pm

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    Offline Bikespod

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    Re: Fuel smell from exhaust and low mpg
    Reply #6 on: March 21, 2021, 02:48:36 pm
    March 21, 2021, 02:48:36 pm
    I’ve just checked the manual for interceptor and it’s the same. Stat opens at 80-84 deg c.
    Looks like I’ll need to order a new thermostat. Damn it.

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    Re: Fuel smell from exhaust and low mpg
    Reply #7 on: March 21, 2021, 02:49:27 pm
    March 21, 2021, 02:49:27 pm
    Thanks Lars. Looks like we were both looking at the same time 😉

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    Re: Fuel smell from exhaust and low mpg
    Reply #8 on: March 21, 2021, 02:55:40 pm
    March 21, 2021, 02:55:40 pm
    I’d still like a Mk1 owner to confirm their rad only gets warm once the display states 80-85 degrees before I go ahead and order parts and plan for the strip down.
    Why did they have to put it in the least accessible place that they possibly could 🙄

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    Offline Bikespod

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    Re: Fuel smell from exhaust and low mpg
    Reply #9 on: March 21, 2021, 04:29:23 pm
    March 21, 2021, 04:29:23 pm
    So having tested it again
    The bike warms up and steadily gets up to 82 before it sits there for a while, then it starts to slowly head up to 102 before the fan kicks in and drops to 96 when the fan shuts off again. Then it repeats this cycle of 96 to 102 and back down again etc

    Maybe the warming right radiator is a bad indicator of what’s going on. I hope so.
    Last Edit: March 21, 2021, 04:35:52 pm by Bikespod