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CVP Kit install Ran great now issues?

Discussion in 'CVP Stage 1 Tuners Kit' started by Steve M, Oct 3, 2013.

  1. Steve M

    Steve M Member

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    Hello, I have 01 883 sportster with only 1100 miles. The bike sat for several years with the occasional startup. I bought the bike in July 13 i knew it had some carb issues enrichener had to be left half out to run, also the popping. But it was basicly a knew bike with only 1100 miles. After finding CVP and studyin this issue i ordered the deluxe kit.
    The 883 has had the baffles in the pipes removed and a SE air breather. Former owner said it was SE stage 1 OK! here are the issues. someone rejetted the carb. It Had a 180 main and a 45 pilot and the mixture screw cap was gone and turned 3 0ut. Also the slide was drilled alot bigger than the bit in CVP kit. I used
    So the internals of the carb looked pretty clean and i sprayed carb cleaner in bowl float area and jets. I removed the 45 and 180 and installed the CVP 44 and 175. Also i installed the EZ-Just Mixture screw and turned it 2 turns out. I installed the CVP spring and Needle
    Ok, Put it all back together and turned Petcock to On Fired right up! Sounded great. Ran a minute pushed enrichener half in then all the way in and adjusted curb idle. Took bike for cruise and was amazed! No popping, Better power. Then about 3 days later i took bike on freeway and right after 70 mph it started cutting out and real bad tryin to get to 80mph? What could this be? Did oil get on top the slide diaphram again? is it the no baffle pipes? or the Air Cleaner needs cleaned of heavy oil and lightly oiled with the k&N oil? or is it the Main jet? or is it something i missed? -Stevo
    Last edited: Oct 4, 2013
    Steve M, Oct 3, 2013
    #1
  3. kenfuzed

    kenfuzed Administrator Staff Member

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    Hi Stevo, I see a couple of things in your message that raise a flag for me.
    "...the slide was drilled alot bigger"
    "Did oil get on top the slide diaphram again?"
    "...is it the no baffle pipes"

    I'll address each one.

    "...the slide was drilled alot bigger"
    If the slide has been drilled larger than the supplied bit I would consider the slide bad and requiring replacement. Years ago a couple of websites and magazines started recommending drilling the slide with a 1/8th bit or larger. When this was later proven to harm performance none of the offenders bothered to publish a retraction, so to this day people come across those recommendations and think it is still okay to do. Bottom line, you have to replace the slide with a new one. Brand new slides are drilled perfectly now so there's no need to drill even with the 7/64 bit. Just install and go. J&P Cycles carries the slide for a couple bucks cheaper than the dealership.
    http://www.jpcycles.com/search/search?Ntt=vacuum piston&Context=28012733&Ntk=All

    "Did oil get on top the slide diaphram again?"
    I would first be concerned that oil is on the diaphragm, and the concern grows if I saw oil there again so soon after cleaning. There should be very little oil making it's way back into the carburetor. Oil in the carb is caused by either oil blow-by or exhaust reversion (see notes about your baffles below). To reduce blow-by check that your oil is just above the ADD mark when hot and sitting on the side stand. On your Sportster don't check cold or with bike level. Too much oil commonly gets puked into the carburetor and air cleaner through the breather.

    "...is it the no baffle pipes"
    Probably a big YES to this. Running without baffles may sound good (to some) but this has an impact on performance. Baffled pipes prevent a condition known as reversion, which is when exhaust pulses and gasses are allowed to move back up the pipes into the exhaust ports. This can sometimes be bad enough to force the fuel and oil (if oil is over filled) back into the intake. Running without baffles can also cause poor low end torque and flat spots up top. Any attempt to rejet is often only masking the actual problem.

    Along with fixing the above items I cannot emphasize enough the importance of checking for vacuum leaks. A vacuum leak around the intake manifold rubber boot, manifold seals, and vacuum line to the VOES will have you chasing your tail because these can cause numerous conditions and a lean mixture.

    HTH
    kenfuzed, Oct 4, 2013
    #2

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