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Post by daqueen on Jul 19, 2008 22:58:53 GMT -5
Hey, Dawgs! I'm needing some help. I'm driving my hubby's Roketa MC-04 150cc scooter. Well...I'm driving along & I can feel it start to chug. I'm doing 35mph & the next thing you know...it dies. Then it won't restart. It's only after I've been riding for about 5 or more miles or so. It used to do it when I was stopped at a light. We thought it was just overheating, at first. Hubby bypassed the vacuum for the fuel & we thought it was fixed. Nope. Tonight, he had to pour some gas into the carb to restart it so I could drive it home. Very, very frustrating.
So, you brilliant scooterists! Can you help me?
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Post by wldcwbypilot on Jul 19, 2008 23:12:53 GMT -5
Probably needs to clean the carb.
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Post by daqueen on Jul 19, 2008 23:26:09 GMT -5
It only had 260 miles on it....but I'm willing to give it a try. But I'm pathetic...how do I do that?
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Post by "Big Guy" on Jul 20, 2008 0:20:56 GMT -5
I'm thinking that you seem to be running out of fuel here... have you changed your fuel lines and fuel filter? I would start with the filter... Could be a vapor lock as well.
-Rich
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Post by daqueen on Jul 20, 2008 0:42:33 GMT -5
Hate to show my idiocy..... can you post a link that would have pics? I'm willing to get my hands dirty & so is hubby, but his talents lie in wood repair rather than mechanics. So pictures of componants & such are a neccessity! Does your PDI have pics to do everything? If so... we are there!
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Post by Aerostudent on Jul 20, 2008 1:13:57 GMT -5
Is the fuel tank full  Aero Gotta check the easy stuff first... |
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Post by hydrophoid on Jul 20, 2008 1:30:51 GMT -5
You should trace the fuel line from the tank to the carburetor. There are pictures all over the forums, although I do not know any off the top of my head, or I would link them to you. If the top search engine dosn't work use the Google one at the bottom of the page.
Ususaly, if you trace the fuel lines from the gas tank you will see an inline fuel filter connected, it is most likely plastic. You should replace that along with the fuel lines.
Really, you should replace all your lines and hoses, you just have to take some down to auto zone, or what ever auto parts store you have and size new hoses up. Make sure you buy the right size hose clamps also.
Do you have the gas tank under the seat and above the engine or below the engine? If it is above you will want to replace said lines and make sure the vacuum controlled valve is working properly, this controls the shut off for your fuel, if it is not working correctly then you will be fuel starved.
If the tank is lower than the engine than you will have a vacuum controlled pump that may not be working properly. I do not know the physics of the vacuum but I have read that the faster you go the less vacuum you have. So if the engine sputters at the higher rpms this could be your problem.
Either way you should at least change your fuel/vacuum lines and your fuel filter.
Good luck to you, my roketa has been great but I did almost the total pdi on it.
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Post by dqueenie on Jul 20, 2008 11:36:48 GMT -5
Had a similar problem,check valve adjustment
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Post by rrich49132 on Jul 21, 2008 7:24:34 GMT -5
I have the same problem as I have 300 miles and am not sure where to start looking. My bike just died after a 12 mile ride in to work as I had to push it 1/4 of a mile.
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Post by scootingranny on Jul 21, 2008 12:03:06 GMT -5
daqueen and rrich 49132:
I hope your problem is as simple as mine. Same thing happened to me on the way to work one am...it was something so simple that a complete PDI surely would have found it.
I tried restarting--the start button would make the engine turn over but not allow it to start. I tried that several times and then called for help. After coming to where I was stranded, DH would push the scoot, it would start and run about 200 yards and then die again. So he would push it for about another 200 yards, it would then start and run for about 200 yards, then stop again and the whole dang procedure would start over. He pushed it home--a distance of 3-4 miles and found problem easily once he got home and could start diagnostic work on it. He is my hero.
The spark plug wire was loose. It LOOKED like a good connection but wasn't even really attached the way it should have been...DH "pushed" it on really good and now Red Hot runs like I stole her.
It had been making enough connection to run from February-July but vibrated just enough the right way to make an incomplete connection to the spark plug. Pushing the scoot down the road apparently allowed a slight connection and it woule then start and run, but normal engine vibration/road texture would shake it and make incomplete connection again and make it die again.
Keep us all posted on results...
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Post by rrich49132 on Jul 21, 2008 12:28:39 GMT -5
That was it.
It did look like it was on good though?
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Post by scootingranny on Jul 21, 2008 13:12:33 GMT -5
At first glance it did look like a complete contact but a closer look showed it wasn't securely connected at all. It would have been easily found with complete PDI but we got scoot and had it running before we found this website. Hopefully will be doing complete PDI within the next few weeks
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Post by rattlemeter on Jul 21, 2008 14:57:46 GMT -5
My scooter had over 2500 miles on it when I had this problem early this month.
From rrich49132's thread:
That spring clip could be a problem for you too, so you might want to keep an eye on it. Once I found the problem, I plugged the wire back on and gently tugged... it came right off. That's why I bit the bullet and cut into it. I might have some photos of my fix. Will post if I find them.
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Post by rrich49132 on Jul 21, 2008 15:39:09 GMT -5
I will take a better look at it tonight. If I never swapped out the spark plug I would of not broken down. Darn see what I get trying to be proactive. Hope this does not come out as I have a 13 mile ride home.
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Post by daqueen on Jul 22, 2008 10:15:51 GMT -5
Hopefully, I can check these things out tonight! It does act like it isn't getting a spark.
This forum is awesome! Thanks everyone!
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Post by rrich49132 on Jul 22, 2008 18:53:39 GMT -5
This darn plug keeps loosing up and shuts the bike down. Just happened again. There is nothing I can do to secure this anymore than I have done. I looked at the wire and even took the plug out of the bike to see how if the connection was weak and not the case it goes in tight. I am thinking that the boot somehow needs to be secured as it just wiggles out. What is strange is when the bike dies I check this and it looks fine but upon taking it off then back on it runs fine. UGH UGH not sure what to do next?
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Post by rattlemeter on Jul 23, 2008 7:57:19 GMT -5
It's not the boot that secures it, it's the clip that is supposed to grab and hold on to the threaded contact on the end of the spark plug. I couldn't reach that clip with even my skinniest needle nosed pliers, so I fixed mine by first removing the chrome shell around the rubber boot. Then I cut the boot off near the base where the contact and retaining clip are so I could get to them. I removed the C clip, put a little bit of a bend in the straight portion of it and slipped it back on.  Then I used high temperature RTV to glue the boot back on, being sure not to get any where it might interfere with the spark plug. I put extra RTV around the outside of the rubber boot, squeezed the two metal shell pieces around it and bound it together with rubber bands to hold it while the RTV set. It's been working for about 200 miles since. If that doesn't work out for you, I guess a new CDI coil (with plug wire) might be in order. |
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Post by rrich49132 on Jul 23, 2008 8:19:54 GMT -5
There is no way I can do this. Any suggestions on where to get the new one you told me about? Like I said before what is strange is when I take the boot off and the plug and connect it outside the engine it appears fine as I see the tiny clip in there and it seems fine and it holds just fine? I had this break down on my on a major road and have garaged it as I just don't feel confident to ride till I get this fixed as I dont care about spending $40 or so for a new one.
Can you point me to a website that sells the orange bando unit as I googled it and was coming up empty on results.
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Post by rattlemeter on Jul 23, 2008 8:32:34 GMT -5
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Post by rrich49132 on Jul 23, 2008 8:57:10 GMT -5
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Post by rogerb on Jul 23, 2008 21:47:32 GMT -5
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Post by shortstop21 on Jul 24, 2008 21:21:41 GMT -5
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Post by harrywr2 on Jul 25, 2008 18:31:00 GMT -5
On my Baja 50 the spark plug wire twists out of the spark plug cap. The spark plug cap appears fairly similar to one of the dozen or so standard NGK spark plug caps that my local Honda parts counter sells for $3.75.(Won't be chrome).
Two things to be careful of at the Honda Parts store...1/2 the caps are designed for spark plugs with
threads on the tip...the other half aren't. Take the plug and the spark plug cap with you.
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Post by rattlemeter on Jul 26, 2008 6:49:55 GMT -5
I believe the caps screw off of all spark plugs, though not all spark plugs are supplied with a cap.
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Post by rattlemeter on Jul 26, 2008 6:54:12 GMT -5
daqueen
We still don't know if your problem was the spark plug wire. Any progress?
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Post by earlwb on Jul 26, 2008 7:08:55 GMT -5
From your first port, you mentioned it dies after riding it for five miles or so, and it used to die or stall at stoplights.
That sure as heck sounds like the intake and exhaust valve gaps have closed up and need to be reset.
The other possiblity is vaccum leaks, check your vacuum lines and intake manifold for cracks, links, etc.
Of course the vacuum operated fuel cutoff valve could be going bad. The OEM fuel filters and OEM fuel lines can be bad on the inside causing intermittent fuel problems. In this case the inner wall lining on the fuel tubing comes loose and acts like a one way valve blocking off the fuel flow. Cheap OEM fuel tubing can disintegrate on the inside clogging up things like the fuel cutoff valve and the debris gets into the carb clogging it up too.
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Post by harrywr2 on Jul 26, 2008 10:35:32 GMT -5
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Post by ladydi on Jul 27, 2008 10:02:14 GMT -5
DaQueen- Well, here's my 2 cents - If you check back at all my posts about my Longbo 150T, you'll see that I had a lot of similar problems and just started at one end and worked forward everytime I thought I had it fixed. First, after only 100 miles, the most obvious was the coil wire and all the electrical connections in the very beginning, changed them all and got 50 miles out of it and it died again. Then I checked the fuel filter, it was loaded with crap (from the cheap China hoses that break own), changed that & ran just great for another 50 or so miles.. Then same thing, just died in the middle of the highway & this time it was the carb - totally loaded with the crap again, from the hoses - (pushed it home over a mile, mostly uphill, dressed in my Sunday best!!)  I had that all cleaned up (sediment bowl was totally solid with dirt/debris) & again, it totally ran teriffic for about 100 miles-  wow! Then finally 2 weeks ago it wasn't getting any gas at all!! only a tiny drip into the fuel filter, I watched it and when it filled up, the bike would run, until it ran out of the gas in the filter & carb and nothing after that! You could crank forever! So, that was when I took out the vacuum pump, plugged the vacuum line, put in a peck cock shut off and all new fuel lines (Goodyear braided fuel injection line) it won't bend on your or collapse! - Oh and I used all metal screw type hose clamps on it, not the easy squeezy ones that come with the bike! So far, so good.....running great.....  As far as the spark plug (I always carry spares, just in case) but on mine, the cap is threaded and actually screws onto the spark plug, not just a push on, in order to make a good connection, you may want to check that too. Mine is a Gy6 motor I've been told, so most parts & workings are pretty much the same.... Hope some of these ideas help you out - it's just a matter of process of elimination when it comes to working on scoots!!! Hell, there's hardly anything else left for me now!! But it was fun learning as I went along - frustrating sometimes, but fun.. I am actually past te 350 miles mark! whoopie :-) |
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Post by matumbo on Jul 28, 2008 9:14:28 GMT -5
Mine used to die after every 5 miles as well, and when i took it apart found out that the fuel line to ther carb would get knicked and not enough fuel was getting through. Chnaged the lines out and now am fine.
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Post by daqueen on Jul 28, 2008 14:23:29 GMT -5
Hey, everyone! You guys are so awesome! I'm trying to find where it lists the type of spark plug I'm supposed to buy to change out the one that came with my scooter. I looked in the PDI, but didn't see it listed there. Unfortunately, DH (who seems to be able to fix everything....at least in our 22 years of marriage!) is NOT an auto/scooter mechanic! He says he doesn't know where to find the spark plug. So..... we may have to find someone who is more talented in this area. Anyone have any illustrations for me? Actually, maybe it'll be in the paperwork/manual that came with his scoot. We have been out of town, so haven't changed anything out, yet, but I do believe that it will be a challenge with the two of us being so ignorant in these matters! Is there anyone out there that is as stupid with this as I am?  Edit: Found the spark plug info at the top of the page of this section! (125cc scooters). So that takes care of problem one... But I'm still ignorant on what to do with it!!!  |
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wow! 
