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Post by wamgaming on Nov 28, 2017 13:37:02 GMT -5
I have a 2016 ATM50A1 Taotao 80ccBBK moped that has a couple issues.
The moped has a cold air intake, upgraded exhaust, and 80cc big bore kit
First, starting in the mornings is always difficult. It is only difficult after sitting overnight, only when its cold outside though. The electric starter in the mornings will just crank over the motor, and it won't start. However, with 2 kicks it will usually start right up. I can tell that the electric choke/enricher is working because after about a minute or so the moped will rev lower to idle. This doesn't really bother me too much, it's more of an inconvenience. You can restart it right after it has been started for the first time on cold mornings right away and even with the electric starter. It does not have any problems starting when it is about 60 outside either, it can be started with the electric starter right away.
The real issue is that, after driving the moped when I go to park it, the idle speed has increased. The idle is still very good but its a little bit faster/stronger than when parked. If I let it idle on the center stand for 5 minutes after driving it, the idle will go back down to what it was originally set at. It's kinda difficult to explain, but it runs much better after being driven.
Things I have done:
Changed the air filter (cold air filter, the cone style)
New carb and enricher
New manifold
New vacuum lines
New Gas Cap
New CDI
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Post by edwardtennant on Dec 1, 2017 15:52:06 GMT -5
does the starter turn the engine over fast enoguh? how fasst does it seem to be cranking the engine?. an idea to check is remove the fuel line and crank over the engine when cold. After a few seconds of cranking fuel should flow from the fuel line. if not, remove the vac line from the intake and suck it and fuel should flow. if it doesnt then your starter motor or battery may need replacing
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Post by pinkscoot on Dec 1, 2017 17:28:14 GMT -5
I don't see that you changed your jets for any of the upgrading you did. That would be the place to start.
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Post by eclark5483 on Dec 1, 2017 22:12:01 GMT -5
Things I have done: Changed the air filter (cold air filter, the cone style) Any time you go from using a stock air blow to a more open type filter, you need to increase jetting. Brand and what pilot/main jets are being used? Irrelevant. Suggestion: Replace stock airbox/filter system and use that instead. |
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Post by wamgaming on Dec 4, 2017 14:05:02 GMT -5
Things I have done: Changed the air filter (cold air filter, the cone style) Any time you go from using a stock air blow to a more open type filter, you need to increase jetting. Brand and what pilot/main jets are being used? Irrelevant. Suggestion: Replace stock airbox/filter system and use that instead. So I have changed the original 30 pilot jet to a 32. The main jet is also changed from a 70 to an 85. It runs much better with the choke on. As soon as it starts, when it's on the choke it seems to run much better. When the choke comes off it wants to die, no matter how much I try to increase the idle speed, it will try to die if it idles for too long. I took out the needle and raised the needle setting to the richest setting(furthest down notch). It will continue to run if given throttle, but the throttle has to be changing. Holding the throttle in one place will kill it. It seems very lean when revved, which did not happen before making it richer. It takes forever to return to idle. |
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Post by jackrides on Dec 4, 2017 14:34:58 GMT -5
Needle position has nothing to do with idle, only about 1/4 to 3/4 throttle. Have you adjusted the idle mixture screw? Check to see if the carb float level is too low. Does the carb have a float bowl drain clear hose? If so, it can aid troubleshooting.
For cold temp starting problem, what oil weight do you use? Can you do a compression test? Heavy oil or excessive compression can slow cranking speed.
And now, just because I can't help it, when did you last adjust the valves?
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Post by eclark5483 on Dec 4, 2017 14:35:51 GMT -5
For an ATM50-A1 you'll want to use a #35 pilot minimum. A #32 is too small. This is more then likely why it runs better when the choke is engaged.
I'd swap it out for a #35, then put the needle back in the correct position and see how it runs. An #85 main might be just a little much for it unless you are using a BBK. Consider a slightly smaller main jet too.
Edit: Nevermind... I see it DOES in fact have a BBK... my bad... so yeah, just swap the pilot for a #35, put the clip back to normal, and you should be good.
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Post by wamgaming on Dec 5, 2017 20:30:16 GMT -5
Needle position has nothing to do with idle, only about 1/4 to 3/4 throttle. Have you adjusted the idle mixture screw? Check to see if the carb float level is too low. Does the carb have a float bowl drain clear hose? If so, it can aid troubleshooting. For cold temp starting problem, what oil weight do you use? Can you do a compression test? Heavy oil or excessive compression can slow cranking speed. And now, just because I can't help it, when did you last adjust the valves? I was thinking that the carb float height might have had something to do with it as well. It does slightly angle down, due to the fact that the air filter is upgraded and the air side of the carb slightly angles down. I just dont see how that would cause the hard starting in the mornings. A couple things I forgot to add as well. It has great compression, and the electric starter's cranking speed is pleanty to get it started on a warm day. I figured out that after it is warmed up, you can get it to idle, however the idle speed is increased after warm. Very strange problem. |
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Post by km4nxa on Dec 6, 2017 16:04:21 GMT -5
Things I have done: Changed the air filter (cold air filter, the cone style) New carb and enricher New manifold New vacuum lines New Gas Cap New CDI Did you put all this on at once after the problem started or was some already installed Would throw the stock air box and filter back on as stated earlier as well. Colder temps, higher o2. |
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Post by wamgaming on Dec 6, 2017 17:28:06 GMT -5
Things I have done: Changed the air filter (cold air filter, the cone style) New carb and enricher New manifold New vacuum lines New Gas Cap New CDI Did you put all this on at once after the problem started or was some already installed Would throw the stock air box and filter back on as stated earlier as well. Colder temps, higher o2. It happened all the sudden with the colder temperatures. It still will start and run fine when its warmer outside (60+), no problem. I just put in a larger pilot jet, I miss-spoke when I said there was a 30 pilot jet installed, there was actually a 35 installed. The next size of pilot jet I have is a 38, so I put that in. It starts much easier, and idles better. I notice now that the idle is much deeper, compared to the higher more sparratic idle with the 35 jet. However now I am noticing some smoke out the tailpipe, and a weird missfiring/sputtering when trying to accelerate. After its past about 1/4 throttle it runs just perfect. I guess fix one problem make 2 new ones. |
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Post by GrumpyUnk on Dec 26, 2017 23:11:33 GMT -5
Have you checked that the accelerator pump is squirting some fuel into the venturi when you open the throttle?
There is a skinny ribbon-looking metal arm that is allowed to movewhen the throttle opens. It moves a rod to force a squirt of fuel into the intake. If not, it may be bum or need adjustment. If dysfunctional, you will get lean stumble on acceleration as the air starts moving when the throttle opens, but the denser fuel takes a bit of time to get in motion.
tom
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