Author Topic: People 50 - Carb Reassembly Screwup?  (Read 91 times)

marbles

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People 50 - Carb Reassembly Screwup?
« on: October 09, 2017, 08:46:45 AM »
Hi everyone - new to the forum and to scooter maintenance! I was given a People 50 last fall and have been riding it for about a year (in Michigan, so took a couple months off in the winter). I was recently having trouble bogging down on uphill climbs - to the point where even after cresting the hill I still had no power. These seemed to happen every day on the ride home from work on hills. After lots of searching and browsing old forum threads, I decided to disassemble and clean the carb. Upon reassembly, I can't get the scooter to start!

When pressing the electric start, if I twist the throttle I don't get any response or revving at all like I would normally expect. I'm wondering if I simply reassembled something wrong or if my disassembly/reassembly caused some other problem.

One thing I did notice that I couldn't figure out - when reassembling the throttle valve (section 11-5 http://scootermasters.com/manuals/kymco%20People%2050-complete.pdf) I am instructed to line up a groove with the throttle adjustment screw. Both sides of the throttle valve have a groove - one short one and then on the opposite side there is a groove that runs the entire length of the valve "sleeve" bit. Which side am I supposed to align with the throttle screw? Would this cause the throttle to not respond when trying to start?

Thank you for any and all advice!

eamartin

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Re: People 50 - Carb Reassembly Screwup?
« Reply #1 on: October 09, 2017, 03:23:08 PM »
If you look at the shorter groove you should notice a taper or bevel down in the groove.  This groove is pointed toward the idle adjustment screw.   

Mr. Paul

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Re: People 50 - Carb Reassembly Screwup?
« Reply #2 on: October 09, 2017, 04:09:04 PM »
Have any of the vacuum lines come loose?
2009 Kymco People 150
1993 Honda Helix

marbles

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Re: People 50 - Carb Reassembly Screwup?
« Reply #3 on: October 09, 2017, 04:44:54 PM »
If you look at the shorter groove you should notice a taper or bevel down in the groove.  This groove is pointed toward the idle adjustment screw.
Thanks! I did get this lined up and the valve fully seated. It started up after that!

Any tips on adjusting the air screw and throttle screw without a tachometer?

eamartin

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Re: People 50 - Carb Reassembly Screwup?
« Reply #4 on: October 09, 2017, 07:08:03 PM »
I usually fire up the scooter and let it warm up until the choke is not needed (or the enricher closes).  With scooter idling I turn the air screw 1/4 turn at a time listening for the idle to speed up (if it slows down I turn the screw the other direction until it speeds up).  When it speeds up I slow it down with the idle screw.  I keep doing this until I cannot speed it up any more with the air screw.  At that point I usually back off on the air screw about 1/4 turn and I'm finished.  It's all by ear for me.  It could be running a little lean with this method and hopefully someone will chime in with a better process if I'm missing something.

marbles

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Re: People 50 - Carb Reassembly Screwup?
« Reply #5 on: October 12, 2017, 11:21:46 AM »
I found it pretty difficult to do the idle and air/fuel adjustment screws by ear, but I think I got it pretty close to where it ought to be. The People felt way better out on flat road, from stops, etc. However, I tried it up a fairly steep hill today and the loss of power was worse than ever before. I had to turn off on a side road and when I rolled to the stop the bike stalled.

Any other suggestions as to what might cause this or what I should look at? Seems likely to be a fuel flow problem based on what I have read, but I'm not sure what to check.

eamartin

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Re: People 50 - Carb Reassembly Screwup?
« Reply #6 on: October 12, 2017, 05:28:01 PM »
Assume for the moment that the carb has been thoroughly cleaned (body passages are open and you can see daylight through the jets).  We then need to look elsewhere for the loss of power on hills.  How many miles on the bike, does it have properly serviced air filter, does it have a fresh spark plug and what is the compression? 

marbles

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Re: People 50 - Carb Reassembly Screwup?
« Reply #7 on: October 13, 2017, 05:08:48 PM »
Thanks for your responses, eamartin! Appreciate it.

Only about 3k miles on the bike. Just replaced the air filter. It is an cone-type "performance" air filter, not the stock air cleaning apparatus. Also just replaced the spark plug while working on the carb last weekend. Not sure how to check compression. I've also seen "clogged fuel filter" as a common cause in the troubleshooting sections in the manual I linked above. Tomorrow I'm going to take out the fuel screen/filter that is included in the petcock assembly. There is no in-line fuel filter, though I have read that can be used either in addition to or in place of the cylindrical fuel filter in the petcock assembly. Thoughts?

eamartin

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Re: People 50 - Carb Reassembly Screwup?
« Reply #8 on: October 15, 2017, 01:07:56 PM »
! I was given a People 50 last fall and have been riding it for about a year (in Michigan, so took a couple months off in the winter). I was recently having trouble bogging down on uphill climbs - to the point where even after cresting the hill I still had no power. These seemed to happen every day on the ride home from work on hills.



1-had you done ANYTHING to the bike just prior to first experiencing this "bogging"?
2-did this happen suddenly one day or gradually over time?
3-at what point did you install the "performance" air filter?