New Student
Currently Offline
VALVES
Posts: 23 
A+'s: 0
Joined: Dec 9, 2014 20:25:05 GMT -6
|
Post by rock71 on Sept 8, 2015 11:25:49 GMT -6
Hello greetings from Caracas Venezuela , I’ve some doubts about the correct oil to use in my Chinese Scooter 250 ( Engine type Yamaha YP250 1P69MM- made by Jinlang, liquid cooled), so the scooter manual says that the oil have to be 4T SAE 20W50 API – SH, okey I’ve had doing oil changes with Mineral oil ( dyno ) 20w50, from break in at 162 km( 100 mi ), 428km( 265 mi ), 533km ( 331 mi ), 1066Km ( 662 mi ), 1766km ( 1097 mi ), 2828km ( 1757 mi ), 4050km ( 2516 mi ), 4998km ( 3105 mi ), so I try to change every 1000km aprox., in this moment counter 5495km ( 3414 mi ), so I think 20W50 oil is a little thick for my new bike and vibration level is a lot, although I’ve made some adjustments tightening screws and nuts, now I’m considering to change to blend synthetic oil 10w-40 4T ( Valvoline, Castrol, Shell, etc.. ), the temperature in my city ( Caracas ) is always warm ( 25 - 33 Celsius ), Is a safe move to change viscosity and oil type in these Chinese scooter ? What do you think about this ? Thank you for opinions  |
|
New Student
Currently Offline
VALVES
Posts: 23
A+'s: 0
Joined: Dec 9, 2014 20:25:05 GMT -6
|
Post by rock71 on Sept 2, 2015 13:20:45 GMT -6
Buenas Rock71 Tengo una Skygo Executive 250 y me esta presentando problemas. Es mi primera moto y la compre de segunda mano, no se si ya venia con alguna falla oculta. La falla que presenta aparentemente es de bujia. en dos meses me ha tocado cambiarla 2 veces. Primero cuando estaba andando y desaceleraba , se me apagaba repetidas veces hasta que un dia no prendio... le cambie la bujia y empezo a funcionar de nuevo. despues apenas a las 3 semanas la fui a encender y no prendio... otra vez cambie la bujia y funciono.. Ahora,, dos semanas despues y eso que solo la uso para ir a trabajar unos 15 km. de nuevo falla y si no la mantengo acelerada empieza a corcobear y luego se apaga. Tendras algun mecanico de confianza que puedas recomendar? yo estoy en caracas. y como te comente al ser mi primera moto pues no se casi nada. tendrás alguna sugerencia? como la compre de segunda mano tampoco tengo el manual... sabes donde lo puedo conseguir. Agradecido de antemano por tu respuesta.. Atte. Ramon Ramón , Gusto en Saludarte. a mi también en el principio me dio muchos problemas, varias veces me dejo varado en el autopista con mi esposa...imaginate el CARON de ella jeje...moto nueva y se apaga  ... bueno después de varios intentos también como tu le cambie varias bujías....hasta que encontraron la falla, la misma esta en el Carburador, debes de limpiarlo bien, puede ir a Bello Monte detrás del centro polo, hay una tienda pequeña que también es taller y venden motos, pregunta por Marcos que es el dueño, de hecho todos ellos tienen la executive y casi todas presentan el mismo problema, ellos ahí te limpian el carburador pero cerciorate  que te lo monten bien de nuevo, son panas pero un poco descuidados. hay otro foro donde estamos varios Venezolanos, te invito a unirte: .foromotos.com/forumdisplay.php?f=222" rel="nofollow" target="_blank"> .foromotos.com/forumdisplay.php?f=222 Cualquier duda a tus ordenes. |
|
New Student
Currently Offline
VALVES
Posts: 23
A+'s: 0
Joined: Dec 9, 2014 20:25:05 GMT -6
|
Post by rock71 on Aug 4, 2015 8:26:43 GMT -6
Hi experts, after changing the oil, my bike started making a strange noise when I accelerated and decelerated, metal tic tic inside motor, valves maybe??, Please some clue of what may be happening, any suggestions are welcome Thanks
Below the video.
|
|
New Student
Currently Offline
VALVES
Posts: 23
A+'s: 0
Joined: Dec 9, 2014 20:25:05 GMT -6
|
Post by rock71 on Mar 14, 2015 14:00:44 GMT -6
Hello Again, In the past weekend I adjust the valves to .12mm (in ) and 0.16mm(exh), everything fine!, well during the week bike begun to lost a lot power, and I had to go to a mechanic to review what's happened, The trouble was the Camshaft Chain Tensioner was broken suddenly  , The mechanic change this tensioner for new one and after the bike was running fine again. The carb was cleaning and adjusted, and the relenti was set in 1300 RPM idle, now is running smoothly with very few vibrations, now my question is about Oil Change Quantity, The Owner Manual here in venezuela for this Scooter says 1.1Lts, the mechanic says that this bike need Oil change 1.5 LTS  , and searching the Chinese scooter that selling in USA, my Model is equivalent to ROKETA MC-79-250. I'm truly confused here  Has anyone the owner manual for Roketa MC-79-250 in PDF Format ??, is to compare what maintenance is done in USA with this bikes ( Yamaha Linhai clone 250 ). Here some photos from my Bike.     Thank you! |
|
New Student
Currently Offline
VALVES
Posts: 23
A+'s: 0
Joined: Dec 9, 2014 20:25:05 GMT -6
|
Post by rock71 on Mar 7, 2015 12:45:29 GMT -6
1.3 liter = 1.05 quarts and that is the correct amount for the Yamaha clone. Exhaust valve I would set back to 0.16mm and intake to 0.12mm but thy are close. Have you pulled the carb and cleaned it? Also you need to make very sure all vacuum lines are tight and no leaks on the carb intake manifold and you have very good vacuum to fuel pump, you've got a vacuum leak which is not letting the fuel pump give enough fuel at a higher RPM or a partially clogged main jet in the carb? JR Thank you, I'll do this tasks tomorrow |
|
New Student
Currently Offline
VALVES
Posts: 23
A+'s: 0
Joined: Dec 9, 2014 20:25:05 GMT -6
|
Post by rock71 on Mar 6, 2015 14:59:24 GMT -6
Thanks you for your response, About the oil, the Yamaha YP250 Manual service says 1.4 LT, but given is a Chinese Clon I just put 1.3Lts , now about " fuel starvation " sounds like that, but the only additional thing that I need to review is the carburetor , here for me the fuel ratio screw is difficult to deal with , thescooterprofessor.proboards.com/thread/3001/4-stroke-carb-tuning, |
|
New Student
Currently Offline
VALVES
Posts: 23
A+'s: 0
Joined: Dec 9, 2014 20:25:05 GMT -6
|
Post by rock71 on Mar 6, 2015 11:05:07 GMT -6
Hello, How are you, I come over here to see if you can give me some help. I have a serious problem with my Scooter skygo Executive 250 (Clone Yamaha YP250), when going uphill the bike turn off and then when I try to turn it on again the RPM not go beyond 1500 and if I try to accelerate it goes off , after a while I let rest a few minutes and turn it on, RPM gets 2000 and everything ok again , I commented that I have done so far, because it is a failure that came from the factory, the bike is new, I got it with 7 KM only. 1) at first, I realized that there was no flow of gasoline or was blocked, whereby a small hole was opened in the mouth of the tank to give relief. 2) the valves were adjusted 0.10mm (intake) and 0.18mm (exhaust), maybe get stuck again ...? 3) I change the oil every 1000km, currently has 3100 Km, I put the oil 1.3 liters at each change ( 20w-50 ). 4) I also have change and 3 NGK Spark Plugs ... Any recommendation is welcome, Thanks! |
|
|
|
, My first scooter is one Bera New Cobra 150 ( is a GY6 motor ) that I've used to learn to ride and the another one, My favorite is a Skygo Executive 250 ( is a clone from Yamaha Mayesty YP250 - the right model is Steed Gas Scooter 250 build by Sampo Motor - Taizhou Oming Motorcycle )