New Rider
Currently Offline
Posts: 27 
Likes: 1
Joined: Mar 9, 2015 20:33:24 GMT -5
|
Post by rock on May 2, 2015 9:05:56 GMT -5
I apologize for my vague information hahaha. The scooter itself has less than 50 miles on it. I got it from a neighbor who rode it home from the dealership and let it sit for a year.
As for the carb, I recently went through every jet with carb cleaner and did everything I could to get the rest of it clean. When I adjust the idle speed screw, it does change the RPMs but the idle still fluctuates a ton. As for the A/F screw, I started with it about two turns out and tried to tune. This did not change the idle RPMS nor did it stop backfire.
|
|
New Rider
Currently Offline
Posts: 27
Likes: 1
Joined: Mar 9, 2015 20:33:24 GMT -5
|
Post by rock on May 1, 2015 9:26:59 GMT -5
The scooter is completely stock. I have changed nothing and I suspect that nothing has changed due to riding given the fact that I have only about 37 miles on the engine. Stock carb stock air filter (no uni). I tried tuning the carb using alley's tuning guide with no luck
|
|
New Rider
Currently Offline
Posts: 27
Likes: 1
Joined: Mar 9, 2015 20:33:24 GMT -5
|
Post by rock on Apr 30, 2015 21:51:11 GMT -5
Hey guys, I've been having even more problems with my scooter lately  and I need your guys' help again. The idle on my 150cc GY6 engine has been really crumby lately. I have the stock carb with a 103 main jet and the stock filter. Sometimes it starts right up and has a great idle. Then at times it will start up and sputter out if you get off the throttle. Other times, it will start out great and then after about the 5 mins (i assume after the enricher quits) the idle will get to insanely high RPMs. My best as to why this is happening is because the A/F mixture is too rich. Another problem I have been having is terrible fuel economy, I am only getting about 40 MPG out of this stock engine which is supposed to get about 80. Again, is this because the mixture is too rich? One other small thing is that I have been getting some popping in the muffler, I don't know what causes this, or how to stop it. Anything you guys have helps. The only bad sign that I have noticed throughout all of this is that the spark plug is slightly wet with oil upon inspection. I don't know why this is bad, I just know that it is. I honestly don't know why all of these problems are happening....the engine has less than 50 miles on it. I just want to ride so anything that you guys can suggest that might help me fix these issues is much appreciated. Thanks for letting me be a part of such a great community! |
|
New Rider
Currently Offline
Posts: 27
Likes: 1
Joined: Mar 9, 2015 20:33:24 GMT -5
|
Post by rock on Mar 24, 2015 23:41:54 GMT -5
Looks like you guys aren't weight weenies lol. I've already added some more things to my tool box haha.
Keep on riding,
Rock
|
|
New Rider
Currently Offline
Posts: 27
Likes: 1
Joined: Mar 9, 2015 20:33:24 GMT -5
|
Post by rock on Mar 24, 2015 12:19:24 GMT -5
Thought it would be a good idea for us to all share what we carry with us on our scooters. Help others learn and have a good time. With that being said, what's in your toolbox?
|
|
New Rider
Currently Offline
Posts: 27
Likes: 1
Joined: Mar 9, 2015 20:33:24 GMT -5
|
Post by rock on Mar 23, 2015 23:19:18 GMT -5
You guys hit it right on the nose. I threw a 105 and a different idle jet in there and it did the trick. Now I just have to dial in the idle. Can somebody link me to "Alley's" A/F mixture guide? I've seen it before but I can't seem to find it now. The exhaust is really dirty on idle and rpms are low. But the good news is that it no longer bogs out after the clutch engages. Thank you guys so much! TBA its really easy to remember if you break it down to the nuts and bolts of it. First let the scoot warm up , next set the idle screw so the scoot idles around 2000 rpms. Next turn the air fuel to the right until the idle begins to drop then turn the air fuel back until you get the highest idle. After that lower the idle screw until the scoot is idling around 1700 rpms. Very simple. Just be careful the scoot doesn't start to idle too high or it may take off on you . if I begins to idle too high drop the idle screw back down until you reach 2000 rpms and proceed with adjusting the air file to the highest idle. Thanks for the useful info. I'll be sure to use it while tuning. Thanks! |
|
New Rider
Currently Offline
Posts: 27
Likes: 1
Joined: Mar 9, 2015 20:33:24 GMT -5
|
Post by rock on Mar 23, 2015 23:18:41 GMT -5
rock. That's good to hear you got it up and running. I was starting to wonder if the jets were the problem. Go step by step through the carb tuning guide by alleyoop and you won't have a problem. Now that it is warming up I am loving my night time ride to work. Keep us updated, and ride safe. Will do  . This community and forum are both great places and I plan to be here for a while. Thanks for all of your help with everything. Hope to see you around. |
|
New Rider
Currently Offline
Posts: 27
Likes: 1
Joined: Mar 9, 2015 20:33:24 GMT -5
|
Post by rock on Mar 23, 2015 20:15:21 GMT -5
A 75 main jet is extremely too small for a 150cc. With all stock the main jet should be 100-104. That may be the problem. Maybe someone replace the carb but installed one for a 50cc instead of 150cc. Wow , if its really a 75 , I hope I wasn't running too lean too long . you may have a bigger issue . maybe someone drilled the 75 out to a bigger size ? At this point the best thing to do is order a new set of stock jets for the carb . You guys hit it right on the nose. I threw a 105 and a different idle jet in there and it did the trick. Now I just have to dial in the idle. Can somebody link me to "Alley's" A/F mixture guide? I've seen it before but I can't seem to find it now. The exhaust is really dirty on idle and rpms are low. But the good news is that it no longer bogs out after the clutch engages. Thank you guys so much! |
|
New Rider
Currently Offline
Posts: 27
Likes: 1
Joined: Mar 9, 2015 20:33:24 GMT -5
|
Post by rock on Mar 10, 2015 16:08:16 GMT -5
The engine is a stock 150 cc GY6 engine with no upgrades whatsoever on it. The CDI, coil, and spark plug are stock as well. The stock air box is being used and the only thing I have done with that is remove it to ensure that it was still in working condition and reinstall it. The main jet is stamped as a 75. I don't know the size of any of the other jets or components on the carburetor. If cleaning the carb again just to be sure is recommended then I can definitely do that as well as cleaning the petcock. Again, the spark plug is slightly wet with oil upon inspection.
Thanks,
Rock
|
|
New Rider
Currently Offline
Posts: 27
Likes: 1
Joined: Mar 9, 2015 20:33:24 GMT -5
|
Post by rock on Mar 9, 2015 23:29:02 GMT -5
How would one fix this issue? If this question has already been answered you can just link me to it or I can go find it.
Thanks again,
Rock
|
|
New Rider
Currently Offline
Posts: 27
Likes: 1
Joined: Mar 9, 2015 20:33:24 GMT -5
|
Post by rock on Mar 9, 2015 23:05:55 GMT -5
.
I did not clean the petcock. After I cleaned the carburetor I turned the screw back to where it was to the best of my knowledge. I will clean the petcock and adjust the A/F screw before I check delivery. If that fails I will take your advice and clean the carb. The plug is wet (I don't know if that's good or bad)
I want to thank you for your help. I greatly appreciate it and look forward to getting to know more about this community and the people in it.
Rock
|
|
New Rider
Currently Offline
Posts: 27
Likes: 1
Joined: Mar 9, 2015 20:33:24 GMT -5
|
Post by rock on Mar 9, 2015 20:42:48 GMT -5
Hey guys, as a relatively new member of this community I was wondering if I could enlist the help of some of you in answering a question that I have. I recently was given a scooter with less than 30 km on it, only problem is that it had been sitting for nearly 3 years. I have cleaned everything (carb,air box, etc) and replaced most fuel and vacuum lines. It now starts and idles great. My problem begins when you give it throttle. Once it gets revved over about 2000 rpms the engine seemingly floods and shuts off. I need to know what the problem is and how to fix it. Is the air/fuel mixture too rich? Too lean? Or is it something else? I am really looking forward to getting this thing in tip top shape and maybe even some upgrades on it but this definitely has me stumped. Any and all help is appreciated.
Thanks guys,
Rock
|
|
