Bobbe
Scoot Member
Posts: 26
|
Post by Bobbe on Feb 25, 2015 15:05:59 GMT -5
I just bought this 2013 Taotao Thunder new. Put all the 8 miles it has on it. But cold weather made driving it hard for the day I got it we were in the low 50 F. But now below freezing and it wont idle after the cold chock cuts out. So went on ebay look for one of the post suggested and ordered a new carb. May of got one that is a copy cat of the one that was suggested. The main jet is not like the jets I have fond on line for carbs of the type it is very small. I have some jets that I ordered for my Yamaha 50cc jog and they are way to big to screw into the main jet seat.
Was also looking at the information on scrapydogscoters site about idle jet and if it is to small it would cause hard starts and poor idle problems.
I am thinking I may as well take a lost on the carb I ordered from united express dist an order the real Roketa carb and try again anything else anybody can think I should do for winter running of scooter.
|
|
|
Post by humanshield on Feb 25, 2015 15:33:54 GMT -5
Did you try adjusting the Mixture screw?
Also...Adjust the valves. I can promise you valves out of adjustment will definitely cause idling problems. See it all the time.
I usually find a tight exhaust valve on scooters I work on.
|
|
|
Post by stevec on Feb 25, 2015 15:50:05 GMT -5
it is hard to get them to idle without running them for a long time in below freezing weather.
|
|
Bobbe
Scoot Member
Posts: 26
|
Post by Bobbe on Feb 25, 2015 23:21:12 GMT -5
Yes I have adjusted the idle air fuel mixture screw in many directions. Have not tried to adjust the valves yet but may be a near future job.
One other note, this is a 1p39qmb engine. Yes I have read a lot of post that it is only 50cc but some do come with 63cc displacement. Not proven I know. But if so what size main jet do I need and will this make a difference in the idle jet. Is there any difference in the carb for a 1p39qmb vs 139qmb.
Thanks for all advice.
|
|
|
Post by stevec on Feb 28, 2015 21:58:20 GMT -5
my 1p39qmb actually ran better with a #85 main and a #35 pilot jet. changing the jets made a remarkable difference in how it ran, completely eliminated bogging. the P engines are on most taotaos and have 69mm valve stems. my taotao had the 49cc piston and my motofino with the 139QMB had the 63cc piston.
|
|
Bobbe
Scoot Member
Posts: 26
|
Post by Bobbe on Mar 1, 2015 9:37:16 GMT -5
Thank you for your replay I am ordering a new carb and will order the size main jet and pilot jet that you have in yours and see if I can get mine to run better in cold MO weather.
|
|
|
Post by Fox on Mar 1, 2015 10:03:32 GMT -5
Chinese quality control standards aren't always as good as they could or should be so it's not unthinkable that a scooter can come from the factory brand new with mal-adjusted valves. It costs nothing to check them for play at TDC. If you find a tight one with no play, then that's your problem right there. If they are okay then that's peace of mind.
|
|
|
Post by stevec on Mar 1, 2015 12:24:21 GMT -5
a huge percentage of the chinese scooters come off the line with mal-adjusted valves. i go 100 miles on the first oil change and then check the valve adjustment, go another 500 miles, change to a good 4T synthetic oil and check the adjustment again.
|
|
Bobbe
Scoot Member
Posts: 26
|
Post by Bobbe on Mar 2, 2015 9:25:02 GMT -5
Thank you both for your reply's I have one more all day work day and then off for two days. I will then try my hand a valve adjusting never did it on a scooter.
|
|
|
Post by stevec on Mar 2, 2015 13:08:59 GMT -5
watch a few youtube videos, you can see how it is done to make it easier for you.
|
|
|
Post by TurboTyler on Mar 3, 2015 4:09:00 GMT -5
If ya don't mind a fellow Missourian chiming in here. When it's really cold make sure the battery is charged. I also screw the idle screw all the way out till it almost falls out. Pump the gas a couple times then electric start it. Screw the idle screw back in some and try the electric start again. You will need an iridium plug for it if you want better cold weather starts also. This method is tried and true for me at least with below freezing temps also.
|
|
Bobbe
Scoot Member
Posts: 26
|
Post by Bobbe on Mar 3, 2015 9:52:21 GMT -5
TurboTyler not sure why you would reduce the idle screw unless you are trying to reduce the air flow to have less air more gas or in other words you are using the idle screw like a chock.
Thanks will maybe try it one day. Today going to try and adjust the valves.
|
|
Bobbe
Scoot Member
Posts: 26
|
Post by Bobbe on Mar 3, 2015 15:22:31 GMT -5
Here is an update.
Changed plug to ngk lithe m. When I got the new feller gauges found that the smallest was a .004. That as it may be would not fit under the intake or exhaust vale rocker arms. Reassembled the motor. Fired it up. The fast idle was a little fast at first but settled down. Let it warm up then set the idle air/fuel mixture. Bike idle the hole time I put on front cover and the seat.
Decided to take a ride. it hesitated when taking off but most people comment that the thunder has a under power take off. Engine sounded good the half block I got to the stop sign. when I stopped the engine died and would not restart. I will give it some time and try again.
update When I tried it again it started but sounded lean on fuel so went to adjust the idle fuel mixture but found it laying on the engine block below carb. Put it back in but then checked online diagrams and found there is supposed to be a spring to hold tension on the idle jet. With it back in idle but it is up and down have to play with throttle to keep it running. Will have to wait till new carb comes in and put in new jets and try again.
|
|
Bobbe
Scoot Member
Posts: 26
|
Post by Bobbe on Mar 8, 2015 11:24:16 GMT -5
First off thanks to stevec for jet sizes that may of been of much help.
Next be careful of who you buy your parts from as far as carbs go. I think the copy cat carb I got only ran me in circles.
Next it is warmer today than when I was having my most trouble so can't say all is good for cold weather.
|
|