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Post by buford1488 on Oct 16, 2013 16:06:29 GMT -5
looks wet........never liked them kind of plugs.
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Post by deejays50 on Oct 16, 2013 16:07:38 GMT -5
Just put in a 100 main jet. Just as bad if not worse. Lol what the heck??? Let me put in an older copper plug instead of iridium EDIT: Put copper plug, still bad! I took a "pocket cam" to capture the sound of the engine. You can clearly hear it breaking up. VIDEO |
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Post by sailracer on Oct 16, 2013 17:22:32 GMT -5
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Post by sailracer on Oct 16, 2013 17:28:06 GMT -5
What are you using for a carb? in mm.
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Post by deejays50 on Oct 16, 2013 17:53:41 GMT -5
Very useful link. Will read it in full later.
The carb is 17 mm I believe. Stock kymco original carb. Does the engine sound like it's not getting enough air?
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Post by sailracer on Oct 16, 2013 18:15:24 GMT -5
You might want to try a new carb. No cracks in the manifold?You could also remove the carb spacer. They serve no useful purpose.Check for vacuum leaks. all tubing manifold and spacer. It does sound like a fuel/air problem.
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Post by buford1488 on Oct 16, 2013 18:37:13 GMT -5
petcock fuel pump sounds like at high rpm it's starving for fuel. heard that sound before in my life and it was useing all the fuel in carb and cant deliver anough...maybe......buford
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Post by deejays50 on Oct 16, 2013 19:18:27 GMT -5
Just checked for leaks at the manifold with propane. Nothing to report. Spacer has been removed a long time ago. All vacuum lines are intact and I don't suspect leaks. The only thing I can try is to swap my carb with the Roketa. Not sure if that will make any difference but it must be worth a try. Edit: I put the Roketa carb on and the engine only crackles on occasion but not nearly as bad. It didn't seem to have too much power either. The jet in there is a 4mm  jet. It's the stock one for the Roketa. My kymco carb is a 5mm so I can't swap jets. Which leads me believe the jet is too big in my carb. But that also doesn't make sense because the plug should show rich condition. I'm so confused and baffled I'm not sure what to do. |
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Post by sailracer on Oct 17, 2013 10:21:40 GMT -5
Is getting a new keihin carb out of the question?Millsc suggested I get one, and I'm happy with it, It was not too expensive, around 30 bucks or so, and what I did was get a jet kit from parts for scooters. That way, you have like 10 different jets to swap out if needed. I think about 15 bucks for the kit.
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Post by PCBGY6 on Oct 17, 2013 10:56:24 GMT -5
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Post by sailracer on Oct 17, 2013 14:38:32 GMT -5
Thats the one!  |
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Post by deejays50 on Oct 17, 2013 17:37:41 GMT -5
Hey guys. I put my factory carb back in, put the 100 main jet in it, and shimmed the needle with two 3mm washers. I put the uni-filter back on and the scooter feels like normal. Good response to throttle, no crackling etc. I went for a ride about 30% throttle consistently. Cut the key off and stopped. Plug check looks bad still. But it runs so well?! Should I drill my jet out to a 105? or more? Here is the pic I just took of the plug:  |
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Post by PCBGY6 on Oct 17, 2013 18:19:12 GMT -5
I wouldn't drill it. If you mess up even a little you have waisted a jet. I would just buy a cheap set and then you can swap them out until you get it the way you want it.
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Post by sailracer on Oct 17, 2013 18:44:46 GMT -5
It's really not all that bad. 1 size on the jet . maybe. If it doesn't seem to be running too hot. you should be ok.What happens if you connect the stock airbox and drill some 3/8" holes in the underside? It's an easy way to "tune the airflow." You can add or block off holes as needed,plus IMO the stock airbox is easier to maintain than a unifilter( always cleaning and oiling, plus its a dirt magnet, and can't allow it to get wet).
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Post by deejays50 on Oct 17, 2013 22:56:56 GMT -5
It's really not all that bad. 1 size on the jet . maybe. If it doesn't seem to be running too hot. you should be ok.What happens if you connect the stock airbox and drill some 3/8" holes in the underside? It's an easy way to "tune the airflow." You can add or block off holes as needed,plus IMO the stock airbox is easier to maintain than a unifilter( always cleaning and oiling, plus its a dirt magnet, and can't allow it to get wet). I actually tried running without the air filter at all with the stock air box and it bogged.. I honestly think the tubing is too narrow for air flow. There is no restrictor to be found. The plug doesn't look lean to you? Still not seeing that tan color |
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jet
jet. It's the stock one for the Roketa. My kymco carb is a 5mm so I can't swap jets. 
Main Jet
