02 VFR VTEC power dip.

Discussion in 'Mechanics Garage' started by tlarrea, Oct 24, 2007.

  1. tlarrea

    tlarrea New Member

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    Hi everyone,

    Just got an '02 VFR VTEC, and I've noticed when riding that at the 7000rpm mark where the VTEC kicks in (i can hear the change in engine noise) I have what feels like a bit of a dip in power. It's most noticeable when I'm not pushing the bike too hard, in 1st or 2nd gear, not really accelerating too hard, the VTEC kicks in, and there seems to be a drop in power. However when accelerating hard, I don't really notice anything, and the bike quite happily (maybe even eagerly) revs up to 10k+ with no issues. Also, when in 3rd and up, i can feel a bit of a boost in power as the VTEC kicks in, so the problem seems to only manifest in lower gears.

    However on the way home today, i was accelerating in 2nd or 3rd and hit the 7k rpm mark and this time, the bike seemed to get a sudden kick of power which i hadn't experienced before, makes me wonder if that's what is supposed to normally happen when the VTEC engages as opposed to what's previously been happening. I've done a bit of reading here, and am wondering if there's an issue with the R/R? Will check the charging voltage when i can get a multimeter at work tomorrow, from what i understand I'm looking for 14V+ at 5,500rpm on the battery?

    I also followed some of the instructions on blocking the PAIR value hose, but that shouldn't have any effect on the VTEC power change should it?

    Anything else I should check out, is the bike behaving perfectly normally, or I need to do a little digging?

    thanks all.

    Tim.
     
    Last edited: Oct 24, 2007
  2. tlarrea

    tlarrea New Member

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    Ok, managed to dig out an old multimeter, and the reading on battery at about 6000rpm, with high beams on was 13.75 volts.
     

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