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Post by thescooterking on Sept 19, 2008 18:38:55 GMT -5
I cannot get my scooter to run anymore. I replaced it with an electric fuel pump since I was having issues prior to this with it stuttering.
Now it will only run if I hold the throttle down and when I do this is blows out blue smoke through the muffler and I get a loud high pitched sound.
Is my engine shot? I only have 1000 miles on it. Did PDI all hoses are good, spark plug is good, carb cleaner done, adjust air/fuel to 2 turns. Same results. ANY ideas will be GREAT. I need help. I will do anything to fix this so I can get it back on the road.
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Post by wxguru on Sept 19, 2008 18:48:16 GMT -5
Blue Smoke? That sounds like you are burning oil. Have you changed oil or checked it lately?
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Post by earlwb on Sept 19, 2008 18:56:54 GMT -5
Doesn't sound good, almost like the rings on the piston aren't sealing.
Blue smoke means oil is getting into the combustion chamber, maybe a head gasket is leaking on the inside. A sticky valve to maybe.
Do you check your oil level regularly?
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Post by prariewolf on Sept 19, 2008 19:17:45 GMT -5
check your compression. sounds like a broken piston ring.
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mrgrumpy
Junior Dawg
Let R Buck!
Posts: 9
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Post by mrgrumpy on Sept 19, 2008 19:56:48 GMT -5
You might want to think about doing or have done a compression test. If your mixture was to lean b/c of the faulty fuel pump you could have burned a piston…. OR when you changed over to the new fuel pump did you re adjust your idle mixture screw?? The higher pressures from the new pump could just be drowning your engine at idle…
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Post by wxguru on Sept 19, 2008 20:08:17 GMT -5
Don't forget he has a high pitched sound...probably metal against metal
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Post by thescooterking on Sept 19, 2008 20:17:03 GMT -5
Good ideas, thanks guys. I am really wishing I had a buddy who knew these engines. I might start taking it apart, starting with the carb.
I did adjust the idle screw, perhaps it needs to go all the way out. It is that putting airy sound. Maybe I will get a web video going so you all can hear and see what is happening tomorrow, that might help.
I changed the oil before I started, .9 quarts. So it is fresh.
Question, does this engine have an oil pump? Are the valves top mounted? Would it be extremely complicated to pull off the valve cover and have a look? Is there a post that covers compression? Is this just a compression tester gizmo? Thank you again.
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Post by wxguru on Sept 19, 2008 20:24:42 GMT -5
depends on the motor you have.....the Linhai version takes 1.26 quarts
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Post by widehide on Sept 19, 2008 22:00:16 GMT -5
What is the make and engine size of this scooter, and where did you buy it? it might be in warranty. The whishing sound usually is air bypass when a ring or valve or head gasket is bad. As said on here before check compression, a cheap tester is available from most auto parts stores. It is a pressure gauge that plugs into the spark plug hole. Or if you can afford it find a independent MC mechanic, he will isolate the problem faster than you can. Keep us informed and we will help as much as possible, Good luck.
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Post by thescooterking on Sept 20, 2008 7:45:28 GMT -5
I got it off craigslist, it only had 90 miles on it. I put on 1000 in two months using it. Didn't have a problem until the infamous 1000 miles! LOL.
So it seems as I started it today that as I have my electric pump powered it is a low pitch comming out of the exhaust with alot of smoke and then it goes to a high pitch as it runs out of fuel (I disconnect the fuel pump) and then it dies. I cannot idle it, I must always have the throttle wide open.
Perhaps it is better for me to get a Uhaul and bite the bullet on this since it seems to be an engine problem.
I have a CFmoto engine. This is a Roketa Bali 250cc scooter.
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Post by harrywr2 on Sept 20, 2008 9:06:33 GMT -5
If the oil was overfilled then the excess oil will blow out thru the crankcase vent tube into the airbox. (Some light misting is normal).
If the bike has been in an other than upright position the oil will drain out of the crankcase vent tube into the airbox and into the carb. Just had this in the 50cc section on a brand new bike that was shipped upside down.
Rule out that you don't have an airbox/carb full of oil.
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Post by mafunsalow on Sept 20, 2008 9:18:05 GMT -5
I'm no mechanic so not much help, but I am learning and I'm just curious, Is your spark plug covered with oil too? I think that might prevent it from starting but would also suggest a more serious problem that others would be qualified for.
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Post by motomech on Sept 20, 2008 9:22:11 GMT -5
I'm no mechanic so not much help, but I am learning and I'm just curious, Is your spark plug covered with oil too? I think that might prevent it from starting but would also suggest a more serious problem that others would be qualified for. You are learning fast. The spark plug, while seldom the root cause, is almost always a good indicator. He should hook up a gravity feed aux. fuel bottle to see what is going on. |
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Post by mafunsalow on Sept 20, 2008 9:27:44 GMT -5
Ah, grasshopper thank you Sinsa !  |
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Post by Gary on Sept 20, 2008 9:27:55 GMT -5
I can't be of much help, but do wish you the best of luck.
The compression check is easy - unscrew the spark plug, screw in the compression testor, crank the engine, and get a reading.
Personally, if it were me, I'd get the scooter to a shop and have them look at it. Unless it was something silly like being overfilled with oil, most of the problems sound pretty serious. Sorry.
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Post by zt250cc on Sept 20, 2008 23:01:56 GMT -5
MC-54-250B
help...please, I did not use my scooter for 2 months...
Now, it won't start...Only the light, horn, alarm and radio
working. I did not hear any sound from scooter starting...
have new battery install, oil...Only have scooter for 3 months... with 300 miles...Scooter kept in garage...
What is wrong?
Please, help me....
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Post by yarddogbbq on Sept 21, 2008 13:05:36 GMT -5
what is the pressure rating of the new fuel pump???
1-4psi would be best.
make sure your oil does not have gasoline in it. (if the new pump is over pressuring carb)
sticky valve or both valves need adjusting.
yarddog
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Post by helotesguy on Sept 21, 2008 14:21:33 GMT -5
zt250cc,
You will get more responses if you start your own thread with the problem in the header.
Mike
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Post by wildbill on Sept 22, 2008 0:04:48 GMT -5
hey thescooterking,Just a thoughtthat Ihave expressed before,could it be your side stand switch that is causing your vehicle to backfire and the valves are right under the valve cover.easy to get to.I see now you have a roketa? bill
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Post by wxguru on Sept 22, 2008 8:49:58 GMT -5
If I am not mistaken, the 250CC Roketa's don't have a side stand switch. The mc-54-250's don't anyway. Yarddogbbq could answer this, as he also has the Bali
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Post by helotesguy on Sept 22, 2008 9:44:15 GMT -5
The mc-13-250 has no side stand switch
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alauda
New Puppy Dawg
Posts: 1
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Post by alauda on Sept 22, 2008 23:06:57 GMT -5
I cannot get my scooter to run anymore. I replaced it with an electric fuel pump since I was having issues prior to this with it stuttering. Now it will only run if I hold the throttle down and when I do this is blows out blue smoke through the muffler and I get a loud high pitched sound. Is my engine shot? I only have 1000 miles on it. Did PDI all hoses are good, spark plug is good, carb cleaner done, adjust air/fuel to 2 turns. Same results. ANY ideas will be GREAT. I need help. I will do anything to fix this so I can get it back on the road. Hi scooterking, From your symptoms and the observations of others, it really does appear that your electric fuel pump is grossly flooding your carburetor, and your engine is drawing in liquid gasoline rather than atomized/vaporized gasoline. It would be a good bet that this excess fuel is getting past your piston rings, right into your crankcase and severely diluting your engine oil. It doesn't take very much fuel to cut your engine oil's viscosity to practically "zilch". This would explain the high pitched metal-to-metal sound you are hearing. The symptom that the engine only runs at WOT (the engine needs to get in more air to try to balance the flooding) and the blue smoke (burning of diluted engine oil) are both symptomatic of severe flooding. You might try temporarily reconnecting your old pump, to see if the symptoms you describe are relieved. OK! enough with the fuel already, enough, enough, enough.... turn it OFF!, alauda <>< (that's supposed to be the carburetor talking) |
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Post by thescooterking on Sept 23, 2008 13:30:41 GMT -5
Thank you all.
I have an update. I replaced the spark plug and now I get no smoke but I still have the fuel smell. I think alauda is correct. I still think I am getting too much fuel in there. Is there a way to limit this other than buying a regulator? I bought a MR. Gasket 42s so I think that is 1 - 4 psi.
At any rate things are getting better. I just need to figure out how to get it to idle now. It is running much better and sounds normal. I might need to adjust my valves, is there a good post on this with pictures...it still seems confusing for me, and the posts I have seen are for a 150cc.
So that is where I am at, it will run normal without the puttering muffler sound and I don't have smoke, still can smell the fuel. I turned the screw out 2 turns...does that mean I am getting more fuel? So shouldn't I turn it all the way in to limit the fuel and get more air?
At any rate I feel like I am rambling...problem is partially solved, need to get it to idle AND I still can hear the engine going up and down in pitch ever so slightly...which I am not sure what that indicates.
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Post by helotesguy on Sept 23, 2008 14:48:48 GMT -5
Did the fuel smell start after you put in the electric fuel pump? If so then you may have to run a pressure regulator to keep the fuel presure at the right level. Earlwb has a post on his setup. It should work for you as well.
Mike
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Post by widehide on Sept 25, 2008 12:54:10 GMT -5
The pilot screw only adjusts your idle for smooth running, it needs to be about 2.25 turns out. The carb should be able to handle up to 4 psi from the pump, but many folks add the regulator. what I would do first is this. *** If you still smell fuel strong Drain your oil , Alauda probably has pin pointed your problem, refill with the correct oil amount and viscosity. when you drain the oil if you smell gasoline then that was your engine run problem. But you need to find out why you flooded the engine. If the float level valve in the carb does not seal when the bowl is full it will pump gas into the cylinder head and drain down to the crank case. This makes a very bad running condition. With the electric fuel pump don't turn the key on and let it sit with the pump running, start it immediately. If the problem is solved at first but comes back shortly then tear the carb apart to see why the float lets fuel flood the engine. I would do this before adding the fuel regulator. Good luck
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