Carby Carb Needle HELP!

Discussion in '2-Stroke Engines' started by Patch, May 19, 2007.

  1. Patch

    Patch Guest

    So I just got my bike going last weekend...and I saw a post about needing too much choke means you're running lean.

    So I changed the needle from 2nd from top to 3rd (richer), and yet I see NO difference. I still need 7/8ths off all the choke. Can anyone tell me what's going on? What can I do to fix this?

    I don'y trust my self tapering the needle--so what else is there?

    Should I move my clip to the last notch?
    Thanks guys

  2. rcjunkie

    rcjunkie Guest

    No need to taper needles. You might have any of following issues:

    1. AIR LEAK <---most likely problem. Check intake gasket, check carb etc..

    2. Fuel delivery issue which can be anything from clogged fuel line, fuel shutoff valve not working well, clogged mesh screen on fuel valve, if not using a fuel filter you probably have crap in your carb that needs to be flushed out, needle jet that is clogged or not properly machined at factory.
  3. Guest

    Guest Guest

    Yes, no need to taper the needle- yet, or unless you want to fine tune it later. As I said, don't try it if you have ANY doubts about doing it.

    Sounds like you have a small air leak. Sometimes there is only a very subtle difference, especially if your engine isn't broke in yet.

    Check the carb to manifold joint (sometimes they don't go on all the way and those four slots leave four little gaps at the ends). Also check your intake gasket. Use a little Seal All or silicone on both sides of the gasket, then tighten it properly. See if that works.
  4. Patch

    Patch Guest

    okIE doke I'll check it all, but when we first set up the engine, I replaced the gasket with Hightemp and permatex 1a. Maybe I didn't get a good seal?

    I also put a paintball tank Co2 silicone ring in the carb mount, I thought it would help but ill try it without it.

    How can I check for air leaks? Is there an easy way?

    thanks again
  5. Guest

    Guest Guest

    The first thing I would do is to replace the gasket sealer with the original gasket, (or if you tossed it, a new one made with gasket paper, or as some here do-cereal box cardboard) coated on both sides with the permatex.

    I'll bet you a dollar, that the problem.
  6. Patch

    Patch Guest

    Bike guyjoe... I replaced the gasket with high temp and permatex on both sides. I figured just sealer would bust real easy so i added gasket material

    Should I still replace it? It ran with alittle over half today so Maybe my paintball O-ring helped?!?!?

    Thanks (look for my hardware post too) :grin:
  7. Guest

    Guest Guest

    If you are confident the gasket is good, leave it and look for any other possible air leak sources.
  8. Patch

    Patch Guest

    well, The top section of the carb mount thing was snapped of :sad: So I put a paintball O-ring in there, squized it up really tight, and got it to run at almost 1/2 choke (alittle over) maybe just a little cold weather too. But is there any better way to seal the carb mounting thing?
  9. Guest

    Guest Guest

    That carb has to be on the manifold pretty tight. If the "top section of the carb mount thing" was broken, I am assuming you mean the clamp?
    Get a good quality (no dollar store stuff, go to an auto parts store ) hose clamp of the right size range and clamp 'er down.
  10. gone_fishin

    gone_fishin Guest

    i had exactly the same breakage, it seems common. the clamp itself is what breaks it.

    my fix, a strip of beercan (no, not the same one :p ) slightly wider than the carb outlet is long, trimmed the length to wrap about 1 1/2 times around the intake. slid the sleeve inside the carb, then carefully got it onto the intake.

    not one single problem, the engine starts cold or hot, with exactly the expected amount of choke. warms up to no choke in less than a minute, and with the bored jet i have detonation all the way up to WOT. i'm completely lovin' my bike.

    dunno why this worked so good, but it sure did for me 8)
  11. Patch

    Patch Guest

    well, today I still had the weird amount of choke problem. So I had some time on my hands and I move the clip to the lowest setting-(reffered to as UNBELIEVABLY RICH)!!! However I started it with half and once warmed up I moved it down to about 1/8 of CHOKE!!!!(Being Less choke than before)

    This may have fixed the problem. Could it also be that Im running 20 to 1 gas mix? Maybe it causes it to need more gas to actually ignite.

    Well Ive fixed 'er for now anyways. Gonna go take some pictures- thanks guys
  12. gone_fishin

    gone_fishin Guest

    shoot, if i hear of one running best at that setting, i guess i'll have to edit the post :lol:
  13. SlicerDicer

    SlicerDicer Guest

    I been thinking of making mine richer so I will give it a shot too! :evil: I have mine at richer but not richest and its running better... However I bog bad on hills but the hills are insane :shock:

    BTW I will get to posting pictures of mine shortly.
  14. SlicerDicer

    SlicerDicer Guest

    I just bumped it to richest of rich! Good lordy... I got power out the wazoo now :shock: choke fully open and runs like a beast. I guess that was my problem it motors up hills without issue. Will let know how well it runs after doing a bit more testing but it seems very promising.
  15. gone_fishin

    gone_fishin Guest

    please keep us posted 8)
  16. SlicerDicer

    SlicerDicer Guest

    Will do I am at near 6000ft so I am quite up there :)
  17. Guest

    Guest Guest

    Before you guys do anything, make sure you have a fresh tank of 40/1. If you have a half a tank of 20/1 and pour in a half tank of 40/1 you still are running a very rich oil/gas ratio.

    You HAVE to be running 40/1 before you can make any carb setting adjustments. Running 40/1 makes the gas to air ratio richer.

    Now slicer, if you are @ 6000ft, and it runs good with the clip at the bottom, I'm thinking you have an air leak. You should have to run a pretty lean setting up there.
  18. gone_fishin

    gone_fishin Guest

    i agree, theory says at 6k you shouldn't be anywhere near the bottom slot.
  19. SlicerDicer

    SlicerDicer Guest

    Alrighty I will check for a air leak. I did think that I should be running leaner and yes I am running 40:1 I have burned through 2 gallons of 20:1. I bolted everything down snug maybe I need to take a file to the intake?

    EDIT: runs terrible on lean... Where could I be leaking?
  20. gone_fishin

    gone_fishin Guest

    is the carby seated all the way onto the intake? not much room for error there.

    if the intake flange is even a bit off-flat it's gonna leak...same with the exhaust.

    also, the jug-base gasket is critical, and when mine went out i didn't even see it until one whole section was gone. that one robbed me of a ton of performance.