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Post by kaltizer on Jul 16, 2011 7:17:48 GMT -5
It only happens after starting when engine is cold. I try to give throttle, and the engine just boggs and dies. It will idle though. After a while of idling, it seems to be ok and runs fine. Any ideas? Thanks.
Stock Kymco Super 9 50cc
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Post by 90GTVert on Jul 16, 2011 9:41:13 GMT -5
Might be an issue with the automatic enricher not working as it should. Maybe it's stuck out, closing the enrichment circuit? You can remove the enricher and see if the needle is outward or tucked in. It should be pulled in to open the enrichment circuit and heat should cause it to expand outward to close the circuit once the scoot warms up.
(I assume your scoot has this sort of enricher?)
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Post by kaltizer on Jul 17, 2011 15:56:38 GMT -5
Might be an issue with the automatic enricher not working as it should. Maybe it's stuck out, closing the enrichment circuit? You can remove the enricher and see if the needle is outward or tucked in. It should be pulled in to open the enrichment circuit and heat should cause it to expand outward to close the circuit once the scoot warms up. (I assume your scoot has this sort of enricher?) Thanks for the reply. Where is this part located? I wonder if I could try replacing iit. Thanks.
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Post by jmkjr72 on Jul 17, 2011 15:59:57 GMT -5
you will see 2 wires going into your carb those 2 wires go into the enricher
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Post by 1quikvento on Jul 30, 2011 22:39:51 GMT -5
please let me know what you come up with- my bikes had the same problem since i bought it used. never paid it much mind till i went from 49-70 cc a few days ago. now im learning to love my scoot and want it tippy top.
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Post by 1quikvento on Jul 31, 2011 14:21:10 GMT -5
kaltizer- I had the same issue you are having and heres what i did. I turned the recessed screw on my carb,which I believe is the mixture screw, inward till I noticed a major improvement in throttle response. then i adjusted the screw which sticks out, i believe is my idle screw, inward at first which raised it even more, then backed it out a tad till i liked how it was purring. I did all that with the engine warmed up and at normal operating temp.
Went out this morning and it fired right up, never bogged so I'm gonna say problem solved. At least for now..we'll see.
As a note. Check where your throttle cable mounts to the carb. Mine was hitting the bottom of the seat and was cocked at an angle that made the bogging real bad. I took the cable in my hand and twisted it straight while pulling back on the throttle and it smoothed out. So loosen the screw on your intake and spin the carb so the cable wont hit the seat and tighten the screw there. If you run into that like I did. I had to straighten the cable,then I made my screw adjustments.Now it Idles smoooove !!
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Post by kaltizer on Oct 5, 2011 8:47:18 GMT -5
Thanks for all the help guys, I really appreciate it. As it's gotten colder, my Kymco is not running well. I've got a new plug, which I will install today. I will try the carb adjustment suggestion within the next few days and report back. I will also look at the auto choke. Thanks.
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Post by kaltizer on Oct 5, 2011 19:58:38 GMT -5
Come to find out, someone had installed a plug that's different than the one the manual calls for. It was also in pretty bad shape with carbon deposits, oil, etc. I replaced it an noticed a huge improvment in performance. I'll find out in the morning how well it goes in cooler conditions.
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Post by kaltizer on Oct 6, 2011 19:08:04 GMT -5
Man, this scoot ran worse even with the new plug this morning. It just wouldn't take the throttle until I had gone a few miles. I actually thought I was going to have to push it. Back to the drawing board!
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Post by kaltizer on Oct 13, 2011 9:58:21 GMT -5
What I've learned: The NGK BR8HSA is what the manual calls for. The NGK BPR7HS performs much better.
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lbo
Scoot Enthusiast
Posts: 141
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Post by lbo on Oct 19, 2011 17:45:17 GMT -5
I have ran the BR8HSA exclusively for 17K KM on my S9, but if it works for you then great, 7 is a hotter plug right? I was originally going to suggest the plug but now it seems like something else might be amiss. If it runs fine at temp and you only have issues when first starting I would suggest either carb settings (specifically the A/F adjustment) or like 90GTVert suggested the choke. Could also be a dirty carb or dirty fuel filter, while unlikely its worth a look....... I am leaning towards the A/F adjustment might be too rich.
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Post by 90GTVert on Oct 19, 2011 18:09:45 GMT -5
The 7 is a hotter plug and the P in the name means it's also a projector tip.
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Post by 2strokd on Oct 20, 2011 8:55:31 GMT -5
I agree. Like i mentioned before, i own one of these engines and i turn the mix screw in 1/2 to 1 full turn when the temps drop. If not it is harder to start and bogs when you give it throttle.
A 7 plug is ok in this engine IMO. Might be a good idea for you in the colder months especially.
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Post by kaltizer on Nov 12, 2011 6:47:51 GMT -5
Well, since it's gotten down in the low 30s in the mornings where I am, my S9 just does not want to go! I've got to try the carb adjustments!
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Post by thunderkat59 on Nov 12, 2011 8:00:46 GMT -5
The choke being operable is a must :thumb: I posted some stuff here about trying to get my bike to run on 30+ degree mornings and had some frustrations. I had forgotten how sensitive some 2ts are to the weather. On my bike, it was simply a matter of the air being so dense the mixture was too lean. It would do just what you said . . . Bog-out when giving it gas. To move I had to thumb the choke lever in and out really fast at every stop sign. To fix, I richened up the idle circuit, raised the needle all the way and covered half of the airbox nozzle with a piece of bicycle innertube. Basically, cutting a lot of the air out so the bike is only getting what it did when it ran better in the warmer weather. :2cents:
Good luck ! :cheers:
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