Intermittent power loss past 85mph
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  • 2 Post By cbrpaul

Thread: Intermittent power loss past 85mph

  1. #1

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    Intermittent power loss past 85mph

    I haven't noticed any power loss during acceleration however, after reaching 85mph it starts acting like it is running out of gas. Also when cold starting I put choke on all the way and as it warms the rpms rise on there own up to 4,000 rpms. I am at a loss please help if anyone knows anything or experienced this before? 97 carb model

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  3. #2

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    I forgot to Mention that after the bile is warmed I smell a little gas in the exhaust. Not a lot but, noticeable

  4. #3

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    Re: Intermittent power loss past 85mph

    There are two plastic deflector plates that sit behind the air intake in the fairing - if they are missing that will cause rough engine at high speed.
    See this post: https://www.cbrxx.com/engine-airbox-...d-stumble.html
    I'll wager thats your problem.
    And the revs climbing as engine warms on full choke is normal - mine does the same. Its an indication to turn off the choke!
    No good deed goes unpunished!

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  6. #4

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    Thank you leighb for you help. I am not really experiencing rough engine. During acceleration past 85mph the motor cuts out completely as if it's running out of fuel or getting way to much fuel. I have zero control through the throttle as the bike slows. Once I get to around 40 or 50mph the bike jumpstarts and back fires then starts accelerating again.

  7. #5

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    Re: Intermittent power loss past 85mph

    Double check your tank vent line. Make sure the end isn't crowded shut or the line isn't kinked. It should be the smaller of the 2 coming off the bottom of the tank. Also see if there is a vent hole in your filler cap. If that's plugged you'll get the same symptoms. I'd say pop the cap when it happens but then you'll have to have 2 keys. And opening the tank as speed is gonna pretty much guarentee your getting a fuel bath. Not a good idea setting on top of a hot running bike.
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.

  8. #6

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    I don't recall there being a vent hole in my fuel filler cap. If I have one exactly where is it located?

  9. #7

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    This issue started after doing 165mph indicated on Speedo. I tried to go fast again and experienced the issue

  10. #8

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    Re: Intermittent power loss past 85mph

    hello from belgium
    im guessing but is yours a carb version?
    have you had it from new?
    if not do you know if the nose was removed ?
    let me fill you in
    i have a 97 carb version
    the use cv carbs and have a tps( throttle position sensor ) on the lhs of the bank
    several points
    1 the cv carbs hate forced air pressure and variations in pressure
    2 the tps is a potentiometer and the track can wear and give an open circuit
    3 if people before have removed parts then you may be getting forced air to the carbs making the sliders jump about like mad
    the result of this is like bogging or running lean
    the result of the tps failure is surging which can be violent
    the result of both is an over lay of both
    the key bits are
    1 that the tps has a constant increase in ohm reading as you turn it and no open circuit parts on the track
    you can test this via a multimeter
    the tps is kind of hidden by the upper frame and is not easy to remove if the screws are oem tight
    careful as there is a little plastic adaptor plate that mates the shaft to the sensor and it can be very easily lost( its of course black to make it harder to find )
    also guess what the parts are no longer available new from honda, but some can be found 2nd hand and checked
    you may be able to " repair" yours by injecting contact cleaner into the housing ( i did this and it works almost like a new one - i have a nearly new one to compare the readings ...)
    for the forced air some people in their infinite wisdom see fit to remove the air splitter and air guides lhs and rhs and also the undertray baffles ( little white bits )
    this opens up the carbs to violently changing turbulent forced air flow and drives the carbs nutty
    the only way to cure this is to find 2nd hand all the missing bits and install them so they full seal up
    the guides act as a air constrictor and stabiliser making the carbs draw air and not ramming it in
    the injector models have a map sensor that will compensate up to a degree for forced air but it still doesnt like wacky turbulence
    why do i know this
    because the former owners of my bike trashed the oem fairing and installed a chinky one and thought that all that " useless stuff "in the fairing was too tricky to put back in
    mine will bog at about 70 mph if there is a headwind and 80 if there is a tailwind
    i have found 2nd hand parts in germany and will fit them soon
    then i can begin to collect speeding tickets...
    SouthTexas11XX and Stromma like this.

  11. #9

    Member #
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    Re: Intermittent power loss past 85mph

    Quote Originally Posted by cbrpaul View Post
    hello from belgium
    im guessing but is yours a carb version?
    have you had it from new?
    if not do you know if the nose was removed ?
    let me fill you in
    i have a 97 carb version
    the use cv carbs and have a tps( throttle position sensor ) on the lhs of the bank
    several points
    1 the cv carbs hate forced air pressure and variations in pressure
    2 the tps is a potentiometer and the track can wear and give an open circuit
    3 if people before have removed parts then you may be getting forced air to the carbs making the sliders jump about like mad
    the result of this is like bogging or running lean
    the result of the tps failure is surging which can be violent
    the result of both is an over lay of both
    the key bits are
    1 that the tps has a constant increase in ohm reading as you turn it and no open circuit parts on the track
    you can test this via a multimeter
    the tps is kind of hidden by the upper frame and is not easy to remove if the screws are oem tight
    careful as there is a little plastic adaptor plate that mates the shaft to the sensor and it can be very easily lost( its of course black to make it harder to find )
    also guess what the parts are no longer available new from honda, but some can be found 2nd hand and checked
    you may be able to " repair" yours by injecting contact cleaner into the housing ( i did this and it works almost like a new one - i have a nearly new one to compare the readings ...)
    for the forced air some people in their infinite wisdom see fit to remove the air splitter and air guides lhs and rhs and also the undertray baffles ( little white bits )
    this opens up the carbs to violently changing turbulent forced air flow and drives the carbs nutty
    the only way to cure this is to find 2nd hand all the missing bits and install them so they full seal up
    the guides act as a air constrictor and stabiliser making the carbs draw air and not ramming it in
    the injector models have a map sensor that will compensate up to a degree for forced air but it still doesnt like wacky turbulence
    why do i know this
    because the former owners of my bike trashed the oem fairing and installed a chinky one and thought that all that " useless stuff "in the fairing was too tricky to put back in
    mine will bog at about 70 mph if there is a headwind and 80 if there is a tailwind
    i have found 2nd hand parts in germany and will fit them soon
    then i can begin to collect speeding tickets...
    LOL how true it is, good luck and enjoy the g force.

    STex
    Came into this world with nothing and still have it all.

  12. #10

    Member #
    2343
    Bike(s)
    2K Titanium, 85 V65 Sabre (Totalled but saved me)
    Join Date
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    Location
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    7,101
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    Re: Intermittent power loss past 85mph

    Quote Originally Posted by Petescbrxx View Post
    I don't recall there being a vent hole in my fuel filler cap. If I have one exactly where is it located?
    There is a vent ring that is hidden inside the tank under the filler neck. A tube runs from it to the bottom if your tank. If you prop up the tank you should see 2 lines coming down the clutch handle side of the bike. One is large about 3/8 diameter the second is smaller that is the tank vent line. Make sure it's not kinked or clogged.
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.


 

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