New Rider
Currently Offline
Posts: 6
Likes: 0
Joined: Apr 2, 2013 15:01:51 GMT -5
|
Post by bubba377 on Sept 15, 2013 16:49:26 GMT -5
I have a 2008 Roketa mc 54 250 b .the other day on the way to work she just shut off while going down the road(5:30 am BTW) >:( . I pulled over and tried to restart the scoot. it sounds like its trying to start but wont stay running. I have also been having a problem starting the scoot (extended crank) if I let her sit more then 2-3 days with out taking it for a ride. my guess is the cdi box but which one do I order( how do you determine the right one to buy) ???
|
|
|
|
Post by scootnwinn on Sept 15, 2013 17:54:09 GMT -5
My guess is the valves or a bad fuel pump
|
|
|
|
Post by carasdad on Sept 15, 2013 18:01:59 GMT -5
DX... or both..
|
|
New Rider
Currently Offline
Posts: 6
Likes: 0
Joined: Apr 2, 2013 15:01:51 GMT -5
|
Post by bubba377 on Sept 15, 2013 18:48:24 GMT -5
what is the proper way (procedure)to adjust the valves
|
|
|
|
Post by alleyoop on Sept 15, 2013 19:03:29 GMT -5
What motor is in there the LINHAI Horizontal or the HELIX Vertical?
Alleyoop
|
|
New Rider
Currently Offline
Posts: 6
Likes: 0
Joined: Apr 2, 2013 15:01:51 GMT -5
|
Post by bubba377 on Sept 18, 2013 17:58:25 GMT -5
how do u tell the diffrence
|
|
New Rider
Currently Offline
"In HIS Grip"
Posts: 26
Likes: 0
Joined: Jun 18, 2013 19:10:48 GMT -5
|
Post by peaceful on Sept 18, 2013 18:39:29 GMT -5
YOU might want to check out the fuses, real good. If it is trying to run with the starter that means it might be picking up elec through the starter system. Also like the old Chrysler prod it could be the cdi.
|
|
|
|
Post by alleyoop on Sept 18, 2013 19:06:53 GMT -5
I would check the valves. Alleyoop   |
|
|
|
Post by scootnwinn on Sept 18, 2013 19:37:15 GMT -5
I love the way that Helix motor looks. That was the first motor I ever put a BBK on...
|
|
|
|
Post by alleyoop on Sept 18, 2013 23:46:48 GMT -5
Yea the motors with Vertical heads give less vibrations on your ride as well, due to the piston going up and down and not forward and backward like on the horizontals.
Alleyoop
|
|
Sophomore Rider
Currently Offline
Posts: 211
Likes: 1
Joined: Aug 7, 2013 1:36:49 GMT -5
|
Post by f4milytime on Sept 19, 2013 1:40:34 GMT -5
I love the way that Helix motor looks. That was the first motor I ever put a BBK on... I was thinking the same thing, that Helix looks crazy. So crazy I want one. ;D |
|
New Rider
Currently Offline
Posts: 35
Likes: 0
Joined: Apr 11, 2013 13:34:27 GMT -5
|
Post by bjg on Sept 19, 2013 6:52:45 GMT -5
bubba, before you start replacing parts figure out what is broken. For the engine to run you need the right air/fuel mix, good compression, and a spark.
To check the spark, pull the spark plug, put it back in the boot, hold it by the rubber part of the boot and put the metal at the bottom of the plug against the metal of the engine and try to start the bike. If you see a steady blue pulsing spark you have good spark. that would rule out things like the pickup coil and your CDI.
To check if the issue is with your air/fuel mix, remove your spark plug then take a piece of fuel line and dip it in your gas tank a few inches and put your thumb over the hole to trap a little gas in the line and transfer this little bit of gas (maybe a teaspoon worth) into the engine through the spark plug hole. Be sure the engine is cold when you do this (it is flamable after all). Put your spark plug back in and try to start the engine. With that amount of gas it should start and run for a minute or so. If it does start then you have a problem getting gas/air to the engine.
To check compression, pick up a compression tester. You can get a kit pretty cheap from harbor frieght or your local auto parts place. The use the compression tester you remove the spark plug and install the compression tester in the hole. Then hold the throttle wide open and try to start the engine. The gauge will tell you how much the piston is able to compress the gas in the cylinder. You should see at least 100 psi. If you don't see that then you might have an exhaust valve leaking by or something like that.
I'm not an expert like some of these guys but these tests can hep you narrow down where the problem is. As for the starting harder after a few days, my scooter does that as well. What I have found with mine is that there is a vacuum valve that lets the gas flow from the tank into the carb bowl. Over time with the scooter not running the bowl empties and it won't refil until the vacuum valve opens. The engine has to be turning over to create the vacuum which happens when you are trying to start the scooter but it takes a minute for the carb bowl to refil. When I start mine after a few days of not running I crank it for a few seconds then wait a minute or two and then start it and it usually fires right up. I'm sure there is a way to fix that but this work around is easy and doesnt bother me. Good luck and happy hunting.
|
|
|
|
Post by JR on Sept 20, 2013 22:08:24 GMT -5
If you actually have the 250 "B" then it's linhai and the first order of business is adjust the valves. Dying, hard starts all classic valve adjustment on this engine. How many miles on it?
JR
|
|
New Rider
Currently Offline
Posts: 6
Likes: 0
Joined: Apr 2, 2013 15:01:51 GMT -5
|
Post by bubba377 on Sept 21, 2013 19:49:28 GMT -5
THE MOTOR IS A LINHAI HORIZONTAL AND THE MILAGE IS AROUND 2300. I STARTED TAKING THE PLASTIC OFF THE SCOOT THE OTHER NIGHT .HOPEFULLY I WILL GET TO WORK ON IT AGAIN ON SUNDAY.WHILE I HAVE IT APART I AM GOING TO CHECK OUT THE DRIVE BELT AND SERVICE THE MOTOR (OIL CHANGE AND PLUG). I STILL NEED TO KNOW THE PROPER WAY TO ADJUST THE VALVES UNLESS ITS A SMALL BLOCK CHEVY I'M CLUELESS  |
|
|
|
Post by alleyoop on Sept 21, 2013 20:12:24 GMT -5
Here you go:
Alleyoop
|
|
..BAD TO THE BONE..
