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Post by jaydawg220 on Nov 29, 2009 22:57:00 GMT -5
Hey I got my Longia RS4I 4 stroke scoot to Run good when giving throttle After I did the following: -Valve Clearance adjust ment to .002" both intake and exhaust. -Drained Old gas replaced with new Gas and fuel filter -New Spark plug -Took off and cleaned carb (Cleaning main jet and second jet) The battery is completly dead but i ran it with it just to complete the circuit. Now it starts when you give it throttle and stays running only on 1/2 or more throttle. When i try to let it idle the rpms stay high, then go down dramatically, then the rpms go up and down till it sputtlers and dies in after about 10-15 secs. Also at first the head light worked, then i seen it flicker while riding it then i went completely out and doesnt work at all now, along with the tail light, however the Brake light, turnsignals, and horn work. What can i do to get this thing scoot to idle? Attachments:
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Post by Bluefront on Nov 30, 2009 6:05:21 GMT -5
IMO....the idle circuit is still clogged. That idle jet is hard to clean. The slightest bit of gunk will restrict gas flow enough to cause idle problems.
On a sunny day....take the jet out and look through it (with the jet pointed at the sun). You should see a perfectly round hole through the thing. If not...it's still clogged. Use more carb cleaner on it. A thin strand of wire is a last resort.....might work on a bad clog...
Good luck
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Post by felliott on Nov 30, 2009 16:14:40 GMT -5
A #80 drill bit works real nice to clean out idle jet. Make sure you have the mixture screw at least 2 1/2 turns out to start.
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Post by rapidjim on Dec 1, 2009 8:58:25 GMT -5
Be carefull when cleaning the idle/pilot jet. There is a "crosshair" in the middle of the jet, if you drill it out you will ruin the jet and it will run way to rich. When holding up to the light, a clean jet, you will see light and see the cross hair. A .01 inch / .30mm jet cleaner works very well. The only place I could find the right jet cleaner was through Honda.
Best of Luck
Jim
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Post by Bluefront on Dec 1, 2009 9:33:54 GMT -5
^^^^^That "cross-hair" thing is news to me. Both of these carbs I've taken apart had nothing of the sort......just a small round hole through the idle jet.
Wondering about this.....just how would that "cross-hair" thing have been machined into the brass jet? I can't think of a way. Maybe that "cross-hair" thing was just something clogging the jet. Any photos available to document this....?
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Post by "Big Guy" on Dec 1, 2009 9:53:28 GMT -5
No, it's not new... look through one and you'll see it. It's part of the emulsification process and no, it's too small to photograph, you'll have to take one apart for yourself.
-Rich
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Post by Enviromoto on Dec 1, 2009 11:47:25 GMT -5
Ive never seen this "cross hair" either.
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Post by felliott on Dec 1, 2009 15:41:04 GMT -5
I machined 3 idle jets apart to day to look inside, no cross hairs. I drill/clean idle jets with drill bit #80 most every week or so, no problems yet.
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Post by ILLGotti on Dec 1, 2009 23:34:03 GMT -5
It's part of the emulsification process you must have messed up your terminology. Emulsification is a process where oil and water are combined and held in suspension, usually through the aid of an outside emulsifier, which aids the length of time the oil (fat) and water will stay in suspension. Ex: mayo, vinegarette, buerre blanc. Ironically they all have different emulsifiers (egg white, dijon mustard, and heavy cream, respectively) |
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Post by "Big Guy" on Dec 2, 2009 1:40:45 GMT -5
It's part of the emulsification process you must have messed up your terminology. Emulsification is a process where... No I didn't, but thanks for the lesson! I know exactly what Emulsification is. The proper term is Emulsion, but Emulsification has become the slang word in the scooter world, so regardless of which I use, it will be corrected  -Rich |
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Post by rapidjim on Dec 2, 2009 10:55:53 GMT -5
Seems like Big Guy and I have been the only ones to see the "cross hair " which really surprises me. I thought maybe I was seeing things from all the carbs I have cleaned so I went to my stock and looked at the 10 idle/pilot jets I received from : www.partsforscooters.com/Carburetor_idle_jet_qmb139everyone of them had a "cross hair" in them. Then I took my Honda Jet tool, size one (.30mm/.01 inch) and pushed it into the jet and could feel a restriction, rotated the jet, tool went through, pulled it out and re looked into the jet and damn that cross hair was still there. Cleaning with a #80 drill bit makes sense, en.wikipedia.org/wiki/File:Number_80_drill_bit.jpg"English: A #80 drill bit (.0135 inch diameter)" A #80 will go past the "cross-hair" but, the opening of the jet is a #53 drill bit and that bit size will NOT go through the entire jet. en.wikipedia.org/wiki/Drill_bit_sizes#53 drill bit equals .0595 inch. Must be something there. Jim |
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Post by cyberbeer65 on Dec 2, 2009 17:52:29 GMT -5
Adjust your valves to .004. I have the same motor as you, and mine runs great at .004.
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