KymcoForum.com
Scooters - 125 to 300 => People s200 => Topic started by: webslappy on May 17, 2018, 03:51:00 AM
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I recently purchased a '07 s200 with 2700 miles and it runs great except when I hit over 85kph, it randomly bogs down. It feels like the belt is slipping or something because it loses power but just for a split second and then returns to fill power. It periodically does this at higher speeds. At low speed, it doesn't happen at all. Any idea what's going on? Thanks for the help.
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I ran into similar for a few different reasons
- Overheating (in 100 F weather)
- Plug blow out, kinda intermittent.
- Flat spot on rollers (fixed by switching to DP sliders)
I also had a low speed issue due to a cracked vacuum tube, & would bog due to lack of air flow when I overfilled the tank and got going on a hill just wrong
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I thought about flat spot on the rollers and considered swapping them out. What do you mean 'plug blow out'?
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The DP sliders were an overall upgrade anyway so I highly recommend 'em.
I ran stock weight, but for my riding at the time, knowing what I know now, I would have tried 1g lighter.
By plug blow out I mean the gap had gotten wide enough on the plug that it was starting to have issues at high speeds.
I was riding mostly highway with the bike topped out all the time.
Since getting to the plug was a bit of a PITA, I had a fresh one ready when I pulled it apart, but I could have just re-gapped the old one for one more round.
Since you should probably at least check the valves anyway it won't hurt to replace yours while you're there.
I thought about flat spot on the rollers and considered swapping them out. What do you mean 'plug blow out'?
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Thanks for the reply. I'll swap out the plug and roller weights to see if that helps. I searched and found that the S200 weights are 14g. Is that correct? If so, I'll get 13g DP.
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I think 14g was what I used, but to be honest it's been a while.
I'm also not dead sure what gain you'll get but around here I'd give it a shot since if you're not going up you're going down in this area.
I suspect you'll stop top out ~60mph (real, not indicated) in the flats, but you'll get there with a bit more pizzazz. Might negatively impact your MPG a bit too. Might not, not really sure.
I got a pretty consistent 60MPG on mine, & I was not gentle.
Beyond that, if you haven't done it consider a solid carb cleaning. I had a local guy who's great with small engine carbs go through mine, I believe he upped the main jet a bit as well as cleaning it up & tuning it. I can't say it was a huge impact but it was noticeable after 6k miles of whatever I could find to put in the tank.
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I agree with Tromper on the Dr Pulley sliders giving a performance boost. I installed them in my Like 200i (same engine) and got better pull off the line and actually gained top speed due to the fact that the sliders ride higher in the variator. The stock roller weights were 14g and I went with the 13g per Buggy Parts Northwest recommendation from whom I purchased the sliders.
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webslappy
Did you get your bogging down problem fixed? What was the cure?
Scarlett is doing the same thing.
Thanks.
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cleanerman -
The scooter is at the mechanic now. He's replacing the petcock, cleaning the carb and swapping out the roller weights. I'll report back when I get a final resolution
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Thanks, I'll stay tuned.
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Well, I may have cured most of my "missing" problem at high cruise speeds. Reading the owners manual as well as info on the internet, I was under the impression I should be using high octane gas. Well, duh, looking under the seat I find a very clear label that said use 87 fuel. I switched.
Almost immediately, first tank, my bogging, surging or missing was greatly reduced. On tank 5 of regular, branded gas now and is running so much better. Every now and then, when cruising between 55-60, straight and level, it will "miss" but nothing like it used to.
Next I will change the spark plug and check the valves. Other than this little problem, Scarlett runs like a champ.
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Only had to use high octane on highway running (WOT) on a 100 F day. Might have been a bad batch of regular on the prior fillup but it did settle down on premium. Before that I was getting some ping.
The usual routine with the Asian bikes is that the manual say 90 octane, but that's RON, not AKI (R+M/2). 90 RON is about 87 AKI. Thus the confusion.
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I changed the spark plug and I still get an occasional "miss" or "cough" while cruising above 85 clicks. Acceleration is smooth and without hesitation from zero to max speed.
Just wanting to do one thing at a time so I know what the fix is, so next is valve check.
I need a rainy day. :)
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Next time hit 'em when you hit the plug.
This was honestly the easiest valve set I have ever had to do once the plastic was off.
I changed the spark plug and I still get an occasional "miss" or "cough" while cruising above 85 clicks. Acceleration is smooth and without hesitation from zero to max speed.
Just wanting to do one thing at a time so I know what the fix is, so next is valve check.
I need a rainy day. :)
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webslappy
Any luck with your bogging down problem yet?
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cleanerman
Unbelievably, no. It's been at the mechanic for over 2 months. Between parts and labor, I'm over $700 into it and still don't have a fix. I only paid $950 for it but it only has 2300 miles on it so I'm in a quandary. The next thing the mechanic is looking at is the emission canisters but feel like he's grasping at straws. Not sure when I should walk away from it
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So I finally got my scooter back...just in time to put away for the winter. >:( Anyway, the problem was with the stator wire and CDI unit. My mechanic replaced both of them and it seems to have fixed the issue. I only gave it a quick test as it was 30 degrees outside. Hope that's the end of this saga.
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Good news. But geez, 2 1/2 months after your previous update (& at $700+) - hate to think what the final total was.
But glad you can be back out scootering when weather improves (any day now?)
Stig
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Fortunately, he didn't charge me anymore since I'm not sure how much he worked on it over the last 2.5 months. It was a frustrating experience because he's an excellent mechanic but his communication was poor. He wouldn't answer texts\calls, etc. I finally told him I was coming to pick it up and it was fixed when I got it. I winterized it this weekend and I'll start fresh in the Spring and hope no major issues going forward. Thanks to all for their input and help.
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So after cleaning out the carb (see my previous thread), my scooter fires right up and idles nicely. I just took it for my first real ride since last Fall and it still misses under heavy throttle. It's much better than it was but it still hesitates occasionally. Re-reading this thread, I will try lower octane gas in it but any other ideas to try?
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after cleaning out the carb . . still misses under heavy throttle
What are the pilot and main jet sizes?
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Not sure. I believe they're the OEM sizes.
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It's not 'pinging' under heavy throttle - is it?
If so, higher octane is needed, not lower.
Stig
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Sorry Stig, not sure what you mean by pinging, but I used 93 gas with octane booster in it hoping to give it a Spring jumpstart, but maybe it's having the opposite effect? Should I be using 87 or 91?
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Sorry Stig, not sure what you mean by pinging, but I used 93 gas with octane booster in it hoping to give it a Spring jumpstart, but maybe it's having the opposite effect? Should I be using 87 or 91?
No, too low octane can cause pre-ignition (knocking, pinging)
I'm pretty sure your engine issue is unrelated to fuel type or mixture....in any manner. Fuel 'delivery' is a different subject. Others can help you with that.
These things are sold and expected to run in 3rd world countries....on all kinds of fuels.
Stig
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Yes, 87 is your fuel.
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So I'm wondering if I need to re-do my carb cleaning. When I cleaned it, I really just cleaned the jets and the one was completely blocked. Since then, it runs better and the 'bogging down' isn't as frequent. Do you think pulling it out and pulling it apart and doing a thorough cleaning will more than likely fix the bogging down or do you think the bogging down is caused by something different and the clogged jet was just making it worse. Any input is appreciated.
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Probably complete disassembly, re-examine jets and definitely blow out all passages. Inspect diaphragm if it has one and replace if any tears or pinholes. Put the idle screws back the way they were for a starting point.
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A good starting point might be to do some reading about the cons of using an ethanol fuel mixture, while the scooter will not be used during a long, cold winter.
In short, the fuel mixture gets stale, evaporates, and glogges up everything - including air channels. You basically need need to strip everything, and use a carb cleaner to spray all channels and components according to instructions. Then blow it off with an air compressor.
If you haven’t changed the fuel filter yet, it might help to drain the fuel tank, replace the fuel filter, and re-fill the tank with fresh fuel. Remember, the clogging process that took place inside the carb during the long, cold winter., also took place inside the fuel tank when the scooter was stationary.
I am a member of several motorcycle groups in the US, and it became quite clear that ethanol is causing all sorts of carburetor problems when motorcycles don't get used for long periods.
In our country we don’t have ethanol fuel mixtures, we use our motorcycles and scooters almost 365 days per year, and we hardly ever experience carburetor problems.
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WEBSLAPPY Still following your saga.
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that's a wrap on this one. New carb did the trick. Runs smoothly regardless of how hard I stomp on the throttle.
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that's a wrap on this one. New carb did the trick. Runs smoothly regardless of how hard I stomp on the throttle.
Thanks for that!
Stig
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webslappy
Where did you get your new carb?
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Sorry for the delay, I just saw this. I got it from https://www.partsoutlaw.com/oemparts/a/kym/5b50e9bd87a866110c2e0996/carburetor] [url]https://www.partsoutlaw.com/oemparts/a/kym/5b50e9bd87a866110c2e0996/carburetor (http://[url)[/url]. It was the cheapest OEM I could find
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Thanks. Looks like a good supplier.