March 23rd, 2020, 02:52 PM | #1 |
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Name: Ryan
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Messed up my carburetor and I can't figure out what this piece is. Help!
Just picked up an 08 ninja 250r for about $1500 for my wife. When we got it it would die whenever we tried to turn the throttle. Put some seafoam through and it helped a little but still had some issues. So I decided to pull the carb and clean it out. While cleaning the carb I decided to pull the plug so we could access the fuel mixture screw because we live at a higher altitude. Well long story short I pulled the wrong plug and now I can't find a replacement. I don't even see it in the diagrams and I cannot find anything on them please help. It's on the bottom by the bowls. It's a brass cap/plug that goes over what I believe are the 4 bypass holes that lead to the butterfly valve. Hear are some pictures. I really appreciate any help I can get. I just need a replacement so I can tap it back in place and get this thing going again. There are two of them, one per carb, I only pulled one. The fist picture is what the brass cap/plug should look like the second one is the empty space it goes into.
Last futzed with by Rexmortale; March 23rd, 2020 at 02:53 PM. Reason: Clarification |
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March 23rd, 2020, 03:20 PM | #2 |
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Part of the pilot circuit...the 4 little holes are known as "transition ports".
I'll surmise the hole is designed to provide production access allowing drilling of those ports from the exterior of the venturi, then permanently plugged afterwards, to be left intact from that point forward. I've never had to remove or replace one before, but accurately measuring both diameter and depth in order to source some sort of replacement should be doable. A small plug possibly from radio control car, automotive, electronics or firearms industry....you'll need to do some homework. Do NOT use any sort of liquid sealant as the port beneath must remain. The intended target fuel mixture screw lives under the EPA anti tamper plug shown at 12:00 from the brass plug.
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Custom Carb Service Last futzed with by ducatiman; March 23rd, 2020 at 04:51 PM. |
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March 23rd, 2020, 03:27 PM | #3 |
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is the original plug still basically complete to some degree, or is it mauled?
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March 23rd, 2020, 04:49 PM | #4 |
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Yeah, if you have original plug, you can repair and put back in. Heat up with crème burlée torche and use plumbing solder or jeweler's silver-solder to plug hole that was drilled.
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March 23rd, 2020, 05:39 PM | #5 |
ninjette.org newbie
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March 23rd, 2020, 05:52 PM | #6 | |
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Quote:
Suggestion....save the remnant for dimensional purposes.
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March 23rd, 2020, 06:02 PM | #7 |
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Sorry mis typed. There are two more holes on the inside. I'm guessing they aren't supposed to be blocked. They are on the inside on the side. They are directly across from each other from where the adjustment screw is to the bowl. Here is a picture, not sure if you can see it though.
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March 23rd, 2020, 06:42 PM | #8 |
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Not visible in photo, I believe the holes you reference are an intersection within the oft mentioned "invisible circuits", cojoining between the air correction circuit, pilot screw, pilot jet and transition ports...
No, you can't block *any* holes within, thus my warning regarding liquids. I think I'm seeing a ridge in the now exposed plug orifice....some precise measuring required to calculate diameter and depth of the needed plug to enable permanent fix. The ridge is designed as a stop to prevent the plug from penetrating and blocking holes within. PS the plug *must be* sealed airtight as well....allowed no ability whatsoever to vent.
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March 23rd, 2020, 06:49 PM | #9 | |
ninjette.org newbie
Name: Ryan
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Quote:
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March 23rd, 2020, 07:05 PM | #10 |
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good luck with it
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March 24th, 2020, 02:46 PM | #11 |
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Thank you for all your help. Silver sodered the plug and sanded the bottom down smooth. Tapped the plug back into place and got the carb put back on the the. No new issues so far except for the original issues that prompted me to pull the carb. Engine bogs down when I open the throttle and hesitates when I actually get the revs up. I pulled the adjustment screws and cleaned them out and set them to factory. Right 2/12, left 1 3/4. I tried richening the fuel and it seemed to help a little, it wouldn't hesitate as much when I got the revs higher but whenever I tried to blip the throttle it would still almost die. I believe I read somewhere on this vast internet the the fuel adjust screws need to be about a 3/4 difference turn from each other so I kept that rule in mind. When I was playing with it I had the right side 4 turns out and the right 3 1/4. As I was adjusting them I didn't notice any big changes in the sound. I put them back to factory because it started snowing. But after I put the screws Back, I took my laser thermometer and the right side header was about 50 degree's F cooler than the left. Here are some pictures of the soder job. Again thank you all for your help. All adjustments were made while the bike was warned up.
Last futzed with by Rexmortale; March 24th, 2020 at 02:48 PM. Reason: I suck at typing on my phone |
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March 24th, 2020, 03:24 PM | #12 |
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the side with the lower temp likely has a plugged pilot circuit.
A test when warm and running ....progressively seating a given pilot adjust screw, bit by bit, should at some point cause that cylinder to misfire...backing out it should then recover. This should be the case on each side....if not, you've found an obvious symptom. Next > dig in to find the underlying cause. Throttle plates badly out of sych? Pilot circuit clogging to some degree? Tight, out of spec valves or a even spark issue? If bike has sat inop for an extended period, likely pilot circuit. ...you are the Doctor...go git 'em. Snow....brrrr. Around 50/sunny here today...batteries returned to 2 of my 4. I'm poised and can't wait to practice my own version of "social isolation"
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March 25th, 2020, 02:01 PM | #13 | |
ninjette.org newbie
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Here's to a few more days of self isolation with the inability to ride 😢. |
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March 25th, 2020, 02:37 PM | #14 | |
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Quote:
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March 25th, 2020, 03:48 PM | #15 | |
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Quote:
https://www.ninjette.org/forums/showthread.php?t=226815 https://www.ninjette.org/forums/showthread.php?t=239678 |
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