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Post by deejays50 on Oct 18, 2013 12:27:56 GMT -5
how narrow is yours? I don't have any narrow places in mine It is probably the diameter of a Quarter. I'm considering getting this thing running perfect and trading it in  |
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Post by deejays50 on Oct 18, 2013 12:21:08 GMT -5
If you're in the USA I bet a pulley puller at AutoZone you could loan for free.
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Post by deejays50 on Oct 18, 2013 5:45:43 GMT -5
you will almost never get a "Perfect color on the plug.If you can upjet,try 1 size. I don't understand about the airbox. I use mine, and I have all the holes I drilled in it blocked . and it runs great maybe you do need a new carb. Do you have any very narrow areas in your stock airbox tube? I do and iit's not removable. I think it's just not flowing enough air. You're right about the uni filter it is much more of a pain to maintain. I'd hate to get another carb as the kymco carb looks to be a good quality carb. Even the slide for the needle jet is metal vs plastic on the Roketa. If the keihin carb is around $30 I may consider it. Where did you get yours? |
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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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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 deejays50 on Oct 17, 2013 8:21:00 GMT -5
Funny the same thing happened to me two days ago.
Take off the fan part, then keep twirling the shaft. I was lucky and saw the bolt through one of the holes on the flywheel. Hit it with another magnet and a small pick.
Definitely get it out of there.
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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 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 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 deejays50 on Oct 16, 2013 15:06:13 GMT -5
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Post by deejays50 on Oct 15, 2013 18:09:31 GMT -5
It's alliiivveeeeee! Stock air box is on. Sounds good! EDIT: Everything is still running smooth. I drove around just for alittle while at around 25-30mph. I did not pull the throttle WOT even once, but I did go around 1/2 throttle for about a second, and it began to break up badly. I always had this issue with the stock airbox and my  main jet. Would it be safe to assume that after 1/2 throttle its actually too rich? Too much fuel thus misfiring? Let me know what you think. Thanks again for helping me through the struggle! |
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Post by deejays50 on Oct 15, 2013 17:04:46 GMT -5
as you all know me..i build RACING ENGINES from micro sprint's to raptor-briggs and so on..you never break in a four-stroke at high rpm's. a 2-stroke is differant i rebuild them at the track and hold them wot all the time. a four stroke has a lot more componets in it to fail. first day slow and second day..third day a little more and so on..but at first NO!!!! thanks..buford That's what I thought!!!! Thank you!! |
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Post by deejays50 on Oct 15, 2013 16:21:13 GMT -5
I really don't think you can tell from the color in this case,as it looks like a peice of the piston broke along with a ring which allowed oil into the combustion chamber accounting for all the black. If you read the airsal instructions, I beleive it says a 30 or 35 minute run-in before WOT.Your case is a tough call.Could have even been a defect.If it were me, I'd go with another airsal. They are way better than anything on ebay,And not much more expensive.Whatever you do, watch the temperature carefully, as a lean condition will overheat the cylinder fast. I've already got the scrappydog kit in. I'm almost done. But what I was asking is the WOT run with a brand new top end. Seems like a bad idea? |
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Post by deejays50 on Oct 15, 2013 13:28:01 GMT -5
I'm following a tutorial for installing the BBK. I'd link to it but I'm not sure its allowed.
They say at the end of the tutorial to go for a WOT run with a new plug (to check lean condition). To me this seems trivial... Shouldn't WOT be avoided during "break-in" or is "break-in" not necessary? (aside from the frequent oil changes)
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Post by deejays50 on Oct 15, 2013 7:45:02 GMT -5
I am using a regular Gates belt. Nothing fancy: linkI checked the shaft for where the clutch sits on, and it does not move at all, no play. I've had exhaust problems from day 1, but the idiot previous owner mounted the exhaust with NO SUPPORT. So I had to weld a bracket onto the muffler. I still have the stock clutch(from previous owner), but I'm not sure its complete. One thing I do know is that my rollers are flat spotted (soon to be replaced). I can take more photos of the clutch faces after work today. My BBK parts should be arriving today as well. Thanks guys this part of my scooter really aggravates me. And leaves me with shaky arms after riding for a while. |
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jet. It's the stock one for the Roketa. My kymco carb is a 5mm so I can't swap jets. 
main jet.