Engine bogs down when accelerating quickly from a stop ?

[taishar]

So I've had my buddy 125 for about... 4 months now ? I think it's been 4 months. I've put about 1500 miles on it so far, so it should be nice and broken in by this point. I've been riding it pretty hard lately and have noticed a couple things. I'm not sure if they're normal, or if it's a sign that something isn't quite right.

When I'm at a stop, if I go wide open throttle, or even 3/4, the engine revs for a split second then bogs way down, then slowly picks up. Now, I would expect this to happen if it were merely the engine revving until the clutch engages and then bogging down slightly. However, this doesn't happen at all when I accelerate more moderately. If I accelerate from a dead stop with no more than 1/2 throttle, I get no bogging. This strange behavior makes it so that accelerating at 1/2 throttle gets me up to 30mph faster than wde open.

Another thing I've noticed is that there doesn't seem to be any difference between 3/4 throttle and wide open. My top speed on a flat road with no wind is about 68 indicated. I can do that speed with 3/4 throttle. Twisting it all the way open doesn't seem to do a damn thing.

I live in Florida, at sea level. Is it possible that my scooter is running a bit lean ? I haven't made any modifications to it yet, though I plan on getting a prima pipe (and doing the corresponding rejetting) and possibly a NCY CVT kit depending on how complex of a job it appears to be. (Going to order some Dr. Pulley sliders and poke around the CVT while I have it opened up to see if it's something I can do myself)

Any input would be greatly appreciated.

[KRUSTYburger]

Sounds familiar to me, must be a Florida thing?

[Tysonviolin]

Could be the spark plug. That's a cheap and easy thing to try.

[Tocsik]

Another possibility is that your carb is loading up while stopped. I just had my 5000 mile service on my '08 150 and they found that my throttle pin was busted. This caused my carb to load up which manifested in some backfiring during deceleration from speed to a stop. It also caused my scooter to generally run rich. Not sayin' you have the same problem; could just be your air/fuel mix needs tweaking. I would suggest a run by the shop.

[eyesopened]

I saw your measage. one thing that happened to my buddy,(150), was similar, with other symptoms as well. I took it to be repaired at the place I bought it. I recieved disturbing news. My carb. was plugged,& my rollers needed to be changed. It turns out this is a comond problem with buddys. Bad news if your on a budget, it cost near $300.00. the problem can occur every 2000 to 3000 miles. soner if you drive in traffic and accelerate hard getting in front of people.. My guess is carb. partially pluged, and rollers starting to go. Like I said, I was shocked. sorry, eyesopened.

[Major Redneck]

The carb. gumming can be cured by using 2oz. of SeaFoam per gal of gas. Also it well do alot of other good things for your scoot. I use SeaFoam every 4 tanks of gas and after i run that tank out i change the plug with a new one. I would not "Hurt" your engine to use SeaFoam in every tank but it would be costly and i dont think you would benifit from it. http://www.seafoamsales.com/ has video and other information on what SeaFoam does and how to use it. Can be found at any good parts store.

Far as rollers you need an impact to get the nut off and on... "REMEMBER MOST NUTS ON THE VARIATOR ARE RIGHTIE TAKE OFF NOT TIGHTIE!!!"there are some eletric ones on the market that should be able to do the job for close to $40-50 or so. I wounder if sliders would last longer? Iv found on my 50cc with over 24,000 miles to at least clean and check rollers and clutch every 2000 miles. The rubber dust will collect in the Variators which in turn will not allow the rollors to roll making a flat spot on the rollers and making it hang up. I use brake cleaner to clean all parts. Check belt. After you put things back together leave the cover off to run the scoot to see if things are what they should be. Making sure you get a good seal on the cover, any kind of fluid gets into it will cause big problems down the road. Keep your work clean and free of grease, take no shortcuts, remember safety and you sould be fine.... Its a good time to change your gear oil as well.

Clutch, iv found that the pads on the clutch get dirty and need cleaning I just use fine sandpaper to ruff it up a little. Once you take the bell off you will see what needs ruffing up. Its best to vac up the rubber dust right after taking off the cover before you do anything.

[Cheshire]

This thread was a real help for me, as far as throttle, acceleration, and top speed goes. Once I played around with the whole "feathering throttle" idea, I've gotten so much more out of my 125! I've almost got it down pat...can't hit it reliably every time, but when I do I can hear it (and feel it! ) just take off! Good stuff.

My Puca will be 5 months old next week, about 4,400 miles right now. (Holy crap, time flies!) Aside from regular oil changes, I've gotten the break-in service and a 4,000 mile service (which I'm starting to think I got the interval wrong on...gotta check on that). I run my scooter HARD. At 4,000 miles, they changed my original spark plug and said my belt was showing signs of wear; that got changed, too. Other than that, it's been pretty smooth sailing. I've got a set of slider weights coming in the mail 'cause I'm starting to think the original rollers may need changing, but the shop didn't say anything about them. Guess that'll make for a nice 5-month anniversary gift for Puca.


But yeah...play around with the info on feathering the throttle in that thread. Makes a world of difference.

[Kaos]

I saw your measage. one thing that happened to my buddy,(150), was similar, with other symptoms as well. I took it to be repaired at the place I bought it. I recieved disturbing news. My carb. was plugged,& my rollers needed to be changed. It turns out this is a comond problem with buddys. Bad news if your on a budget, it cost near $300.00. the problem can occur every 2000 to 3000 miles. soner if you drive in traffic and accelerate hard getting in front of people.. My guess is carb. partially pluged, and rollers starting to go. Like I said, I was shocked. sorry, eyesopened.

I'll respectfully disagree with this. This is not common in any way. The only time this will happen is if the bike sits for a very long time. Carburetors don't just suddenly gum up, it requires very old gas sitting for quite a while to build up varnish inside the carb for this to happen.

Stock rollers also commonly last 6000 miles, with the Dr Pulley aftermarket weights going 6000-8000.

[ScooterTrash]

I saw your measage. one thing that happened to my buddy,(150), was similar, with other symptoms as well. I took it to be repaired at the place I bought it. I recieved disturbing news. My carb. was plugged,& my rollers needed to be changed. It turns out this is a comond problem with buddys. Bad news if your on a budget, it cost near $300.00. the problem can occur every 2000 to 3000 miles. soner if you drive in traffic and accelerate hard getting in front of people.. My guess is carb. partially pluged, and rollers starting to go. Like I said, I was shocked. sorry, eyesopened.

I'll respectfully disagree with this. This is not common in any way. The only time this will happen is if the bike sits for a very long time. Carburetors don't just suddenly gum up, it requires very old gas sitting for quite a while to build up varnish inside the carb for this to happen.

Stock rollers also commonly last 6000 miles, with the Dr Pulley aftermarket weights going 6000-8000.

X2

[Skootz Kabootz]

I saw your measage. one thing that happened to my buddy,(150), was similar, with other symptoms as well. I took it to be repaired at the place I bought it. I recieved disturbing news. My carb. was plugged,& my rollers needed to be changed. It turns out this is a comond problem with buddys. Bad news if your on a budget, it cost near $300.00. the problem can occur every 2000 to 3000 miles. soner if you drive in traffic and accelerate hard getting in front of people.. My guess is carb. partially pluged, and rollers starting to go. Like I said, I was shocked. sorry, eyesopened.

I'll respectfully disagree with this. This is not common in any way. The only time this will happen is if the bike sits for a very long time. Carburetors don't just suddenly gum up, it requires very old gas sitting for quite a while to build up varnish inside the carb for this to happen.

Stock rollers also commonly last 6000 miles, with the Dr Pulley aftermarket weights going 6000-8000.

I respectfully agree with Kaos

I live in LA, which I'm pretty sure counts as riding in traffic, accelerate hard, because it's fun, and have well over 3000 miles of 100% trouble free fun behind me...

[r0sa]

i have this same problem, BUT it never did this before 5,000 miles, it jerks as im accerlating at 5 bmph from a complete stop, i'm assuming it's gonna be my rollers, so whenever my bf has the time, he's gonna be installing the dr pulley's in for me and hopefully the problem would go away

[ScooterTrash]

Holy thread resurrection r0sa

[AZruckuspride]

I saw your measage. one thing that happened to my buddy,(150), was similar, with other symptoms as well. I took it to be repaired at the place I bought it. I recieved disturbing news. My carb. was plugged,& my rollers needed to be changed. It turns out this is a comond problem with buddys. Bad news if your on a budget, it cost near $300.00. the problem can occur every 2000 to 3000 miles. soner if you drive in traffic and accelerate hard getting in front of people.. My guess is carb. partially pluged, and rollers starting to go. Like I said, I was shocked. sorry, eyesopened.

Ouch they took you to the cleaners! $300, That's outrages. Roller weights are 30 bucks for the nice Dr. Pulley sliders and cleaning the carb is extremely easy. Takes less than 30 minuets and maybe and I mean maybe a 5 dollar can of carb cleaner (NOT BRAKE CLEANER!!!!!)

[ScooterTrash]

I saw your measage. one thing that happened to my buddy,(150), was similar, with other symptoms as well. I took it to be repaired at the place I bought it. I recieved disturbing news. My carb. was plugged,& my rollers needed to be changed. It turns out this is a comond problem with buddys. Bad news if your on a budget, it cost near $300.00. the problem can occur every 2000 to 3000 miles. soner if you drive in traffic and accelerate hard getting in front of people.. My guess is carb. partially pluged, and rollers starting to go. Like I said, I was shocked. sorry, eyesopened.

Ouch they took you to the cleaners! $300, That's outrages. Roller weights are 30 bucks for the nice Dr. Pulley sliders and cleaning the carb is extremely easy. Takes less than 30 minuets and maybe and I mean maybe a 5 dollar can of carb cleaner (NOT BRAKE CLEANER!!!!!)

I don't think that member is active anymore but yes, if that's true it's ridiculous

[jasondavis48108]

I saw your measage. one thing that happened to my buddy,(150), was similar, with other symptoms as well. I took it to be repaired at the place I bought it. I recieved disturbing news. My carb. was plugged,& my rollers needed to be changed. It turns out this is a comond problem with buddys. Bad news if your on a budget, it cost near $300.00. the problem can occur every 2000 to 3000 miles. soner if you drive in traffic and accelerate hard getting in front of people.. My guess is carb. partially pluged, and rollers starting to go. Like I said, I was shocked. sorry, eyesopened.

I'll respectfully disagree with this. This is not common in any way. The only time this will happen is if the bike sits for a very long time. Carburetors don't just suddenly gum up, it requires very old gas sitting for quite a while to build up varnish inside the carb for this to happen.

Stock rollers also commonly last 6000 miles, with the Dr Pulley aftermarket weights going 6000-8000.

X2

last winter my scooter sat unstarted for three straight months with stabil in the tank. It was a bit rough to get it started, but after some seafaom it ran perfectly. All last season and for storage this winter (2 streches of two months each) I've run seafoam in the tank and I'm at 2500 with no signs of my carb being gummed up. I do run seafoam at least once a month (every 4 tanks of gas) so that probably helps, but its alot cheaper than getting your carb cleaned every 3000 miles.