|
Post by katt on May 10, 2018 0:27:27 GMT -5
I am riding during the day no problem scooter goes 30mph right away, however when i ride after 9pm when its cold outside (Los Angeles) it would not go over 20mph on flat surface, in the morning everything is back to normal it goes 30mph .
This happened when i bought and drove at midnight, was limited to 20mph for about 45 minutes then started to drive properly up to 30mph.
What can cause this?
|
|
|
Post by edwardtennant on May 13, 2018 12:19:33 GMT -5
Colder weather leans out your tune. might be worth giving the carb a clean or going up a few jet sizes
|
|
|
Post by katt on May 13, 2018 20:17:30 GMT -5
This carb cleaning is next on my list because i am tired of this long warm ups it took me about 5 miles yesterday before i felt the power of this scooter, it was groing 0-30mph pretty good however after hitting 30mph mark it went up to 40mph @ 7000RPM even faster like getting a second breath.
5 miles ride to warm up obviously is not acceptable because its struggles hitting even 15-25mph.
|
|
|
Post by jmkjr72 on May 13, 2018 21:17:22 GMT -5
Unless your seize the engine lean lean makes more power then rich
Rich is slow and sluggish so I would check the enrichment circut
|
|
|
Post by katt on May 14, 2018 5:14:17 GMT -5
I have cleaned carburetor, took it apart and cleaned every single part of it, changed engine and transmission oil.
It has full power now right after i start any time of the day, tested today at 2am and it has full power instantly! Before it took couple of miles dragging 15-25mph tops before it warm up and go up to 30mph.
|
|
|
Post by GrumpyUnk on May 14, 2018 11:07:53 GMT -5
If you are concerned that the air being too cold(more dense==more air molecules/liter), causing lean surge, then try ducting some heat near the air intake. The blower produces a good amount of heated air that could be readily ducted to near the air intake if using the factory air cleaner assembly. Flexible metalized ducting is available at auto parts stores. Even with the foam 'cleaners', you could duct some heat into the general area. At first read, I thought it might be carburetor 'icing', where the fuel evaporating absorbs all the heat in the air, and causes ice to form at the coldest spot. That can limit air intake due to reduced passages blocked by ice, or an over-rich mixture because the venturi shape changes, and can cause super=suction to pull excessive fuel from the float bowl. Weird stuff. Rare, requiring humid conditions in cold air. tom
|
|
|
Post by katt on May 15, 2018 2:59:23 GMT -5
Very interesting reading tom, i don't believe i need to do any heat mods in LA California, it was just a dirty carb problem that totally went away after i took it apart and cleaned every passage. I am getting full power as soon as i start now even at night time.
Dunno why before i cleaned it, performance improved after about 5 mile long ride, its beyond my understanding.
|
|
yeska
Scoot Member
Posts: 85
|
Post by yeska on May 21, 2018 23:25:28 GMT -5
This carb cleaning is next on my list because i am tired of this long warm ups it took me about 5 miles yesterday before i felt the power of this scooter, it was groing 0-30mph pretty good however after hitting 30mph mark it went up to 40mph @ 7000RPM even faster like getting a second breath. 5 miles ride to warm up obviously is not acceptable because its struggles hitting even 15-25mph. yup just like myns speedy tao tao 63cc after 3.4.5 miles kick up speed
|
|
yeska
Scoot Member
Posts: 85
|
Post by yeska on May 21, 2018 23:33:16 GMT -5
Very interesting reading tom, i don't believe i need to do any heat mods in LA California, it was just a dirty carb problem that totally went away after i took it apart and cleaned every passage. I am getting full power as soon as i start now even at night time. Dunno why before i cleaned it, performance improved after about 5 mile long ride, its beyond my understanding. what jets are u using .am all stock except carb 19mm main 76 pilot 30 . norev cdi. Valve is 0.7 intake and out . 87 gas arco only slider 5grams. Powerlink belt worn for a year old. Am doing 30-36 flat 42 with little down hill .
|
|
|
Post by katt on May 22, 2018 10:28:48 GMT -5
My problem got solved after i took apart my carb everything including jets and then used carb cleaner on every hole in the carb body and on every part, reassembled and no more need to warm up to get the full power.
Why you using crappy gasoline manual suggest 92 octane, so i always use 91
I have everything stock including jets however i bought scooter used dont know what previous owner changed although i doubt that anything since it was pretty crappy shape, mine is 49cc and it goes 40mph on flat surface at 8000rpm and even faster, but i dont feel like spinning engine any more.
|
|
|
Post by GrumpyUnk on May 22, 2018 11:16:12 GMT -5
There are two octane measuring systems. RON and MOTOR. They come up with different octane ratings for the exact same fuel. China uses the rating system that results in higher octane ratings. In theory, their 9x requirement is just about the same as 'Regular' unleaded from what I can determine. If you do not hear pinging when running 87 octane fuel, continue to use it. Using higher octane fuel does no good, and actually reduces flame front propagation inside the combustion chamber. The marginal cost per tankful is not very much, but use of higher octane may decrease performance a smidge, likely not noticeable, in lower compression engines. The posted octane ratings are supposed to be the 'average' or Research and Motor octane ratings. Who knows... You are supposed to have a maximum of 10% ethanol in retail fuel mix. I would bet there are a lot of supplies that have more than that blended in. Gives better octane rating, but less BTU/lb, so less energy. BTW, you can't win. Heh. tom
|
|
yeska
Scoot Member
Posts: 85
|
Post by yeska on May 22, 2018 22:14:40 GMT -5
I agree brand new 2014 first gas I used was Arco 87 then 89 then 91 . when from fast and more miles fast pick up last longer... to bog down at staring point slow to pick up speed less miles burn faster last less chevron more thick all grades bog down burn fast . but more powerfull at top ends. 76 is just cheap burns ok no up or down normal gas. Shell is bad ..fkkkk that . los angels california ⛽ performance on a 50 cc . a research says that ones that have the less ethanol and thinner will work better on small engine
|
|
|
Post by katt on May 30, 2018 7:27:47 GMT -5
This was pretty informative
|
|
|
Post by GrumpyUnk on May 30, 2018 8:53:03 GMT -5
If you poke around on youtube, you may find the other videos he has made. He installed an O2 sensor and tuned his carb for his local area(Salt Lake, IIRC). He got improved performance and improved economy using the sensor as a guide. He really does a professional job. I compliment him on his videos. tom
|
|
|
Post by katt on May 30, 2018 10:20:09 GMT -5
If you poke around on youtube, you may find the other videos he has made. He installed an O2 sensor and tuned his carb for his local area(Salt Lake, IIRC). He got improved performance and improved economy using the sensor as a guide. He really does a professional job. I compliment him on his videos. tom I was thinking about O2 sensor to read the actual fuel to air ratio, however there's not much point since you cannot adjust it on the fly anyway unless you got injection, but i'll check the video.
|
|