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Post by woodnglass on Sept 3, 2007 19:53:21 GMT -5
Hi,
I'm new to scooting and this scooter.
I'm wondering if you have any ideas as to why my MC54 stalls. I've only puy 30 miles on it. Here's the scenario: Scoot has nice strong start, then rides okay for a mile or so, maybe more, then loses power and stalls. If I wait a minute it will start again, sometimes stall again right away (as I twist the throttle handle to give it power or just to get it to go it feels fuel starved) or go a little distance and stall. I don't think it's electrical but I'm only a novice mechanic. Thought it might be something obvious to you with these bikes that I might look at or you could point me in a direction if this has already been posted before by someone.
Thanks,
Jerry G
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Post by 90GTVert on Sept 3, 2007 21:00:51 GMT -5
Sounds like the classic JinBo fuel pump, or a vacuum leak. Replace the vacuum lines and use the JinBo for skeet practice. Order a Mikuni pump from www.heeters.com to replace it and mount the new pump as LOW as possible, unlike the OEM mounting position. Also be sure your fuel tank is venting, and you may want to bump the main jet up to a 115. Stan Hi, I'm new to scooting and this scooter. I'm wondering if you have any ideas as to why my MC54 stalls. I've only puy 30 miles on it. Here's the scenario: Scoot has nice strong start, then rides okay for a mile or so, maybe more, then loses power and stalls. If I wait a minute it will start again, sometimes stall again right away (as I twist the throttle handle to give it power or just to get it to go it feels fuel starved) or go a little distance and stall. I don't think it's electrical but I'm only a novice mechanic. Thought it might be something obvious to you with these bikes that I might look at or you could point me in a direction if this has already been posted before by someone. Thanks, Jerry G |
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Post by Showme on Sept 3, 2007 22:25:54 GMT -5
Stan's the man on this one. He's right in that you should replace the vacuum lines and also the fuel lines. My MC 54 already had the pump mounted as low as it can go. You might first check all the vacuum and fuel line clamps. Mine had several missing and a couple were installed wrong. I put on better class clamps and so far I have not experienced the fuel problems that so many have had. I have several hundred good miles so far.
Good luck with your new scoot and welcome to the pound.
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Post by woodnglass on Sept 3, 2007 22:45:13 GMT -5
Are fuel lines and vacuum lines made from the same material and have the same diameters, etc. In other words, will the 1/4" ID, 3/8 fuel lines offered on Ebay serve the purpose for both?
Told you I was a novice.
Thanks again.
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Post by scooterollie on Sept 4, 2007 7:31:11 GMT -5
Jerglass; Welcome to the Dawg Pound! No, vacuum lines are made differently than fuel lines. Go to any auto parts store. Take samples with you. As Showme said, carefully inspect all hoses, making certain that all clamps are present and of good quality. Have you drained the coolant, flushed w/water and refilled with 50/50% known quality coolant? If not, do so while you are servicing the lines. You didn't indicate a "B" for your MC-54 so I assume it has the CFMoto/Honda design engine. Stan Jessup's website has good information on this engine. www.oregonvintage.com/ |
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Post by woodnglass on Sept 4, 2007 10:59:57 GMT -5
Stan et al,
Does the gas tank vent through the cap? As I recall mine is labeled non-venting. It's raining cats and dogs here now but I'll check again afterwhile but if it is should I replace with a venting type?
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Post by brycegtx on Sept 4, 2007 11:24:35 GMT -5
Hi, I'm new to scooting and this scooter. I'm wondering if you have any ideas as to why my MC54 stalls. I've only puy 30 miles on it. Here's the scenario: Scoot has nice strong start, then rides okay for a mile or so, maybe more, then loses power and stalls. If I wait a minute it will start again, sometimes stall again right away (as I twist the throttle handle to give it power or just to get it to go it feels fuel starved) or go a little distance and stall. I don't think it's electrical but I'm only a novice mechanic. Thought it might be something obvious to you with these bikes that I might look at or you could point me in a direction if this has already been posted before by someone. Thanks, Jerry G Hi Jerry. I also have an MC-54. I have been lucky with my scoot as I have not needed to replace either the pump or the lines. How were you able to drive the scooter 30 miles given that it runs so bad? Bryce |
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Post by 90GTVert on Sept 4, 2007 11:45:10 GMT -5
I can't say for sure on that model since I have not dissected one, but the Bali body style has a vent line that connects at the front of the tank at the filler neck. The hose runs down behind the panel behind the front wheel and just hangs behind the panel. Stan Stan et al, Does the gas tank vent through the cap? As I recall mine is labeled non-venting. It's raining cats and dogs here now but I'll check again afterwhile but if it is should I replace with a venting type? |
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Post by woodnglass on Sept 4, 2007 16:34:32 GMT -5
I've had the scooter for 6 weeks now but have only put 30 miles total on it. The 30 miles has accumulated through rides of a couple miles here and there around the neighborhood. The longest ride was maybe 5 miles and I had to get it towed home because of the aforementioned. Sorry I wasn't clear(er)
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Post by woodnglass on Sept 4, 2007 16:43:58 GMT -5
I've had the scooter for 6 weeks now but have only put 30 miles total on it. The 30 miles has accumulated through rides of a couple miles here and there around the neighborhood. The longest ride was maybe 5 miles and I had to get it towed home because of the aforementioned. Sorry I wasn't clear(er)
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Post by WarrenS on Sept 4, 2007 18:26:43 GMT -5
To me it sounds like the choke is not releasing since it starts good. Then when it gets warm it stalls.
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Post by stormy on Sept 4, 2007 21:00:26 GMT -5
jerglass, the easy way to find out if your gas tank has a plug vent is to unscrew the gas cap, leave it in place and test drive it. As Stan said the vent is on the top of gas tank, but instead of dropping down behind the panel it runs along side of the hump behind the tank on left side. Mine was wrapped around in a circle and just hung there. I think it went to the canister under the seat, but was not hooked up. If it is the vent being plugged let us know, and I'll tell you how to get the panels off to inspect the vent line. The way mine was hung, if you over filled the tank and gas run down the vent line it would plug the line. There is also some kind of filter or connecter in the vent line about half way back, I don't know what it is.
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Post by 90GTVert on Sept 4, 2007 21:10:24 GMT -5
If that is the case, it would blubber from the rich condition and adding throttle would clear it, at least temporarily. Stan To me it sounds like the choke is not releasing since it starts good. Then when it gets warm it stalls. |
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Post by woodnglass on Sept 6, 2007 12:02:58 GMT -5
I want to thank all of you who answered my post and the ideas for what might be wrong with this scooter. I'm leaving for a two week vacation this weekend so will not be attempting any fixes til I return when I can take the thing apart. I don't have a covered area so best just leave it alone for the time being. I'll keep you all posted.
Thanks again,
Jer
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Post by roadster250 on Oct 8, 2007 14:27:35 GMT -5
Jerglass,
I've got the same scoot, different stickers. The Mikuni vacuum pump and better fuel lines did nothing for my similar stalling problem. A universal electric pump appeared to solve the stalling issue, until I was 40 miles from home a couple of weeks ago. The electric pump appears to have pushed past some crap in the carb internal piping to the float chamber.
Shortly after verifying that the fuel pump was pushing fuel, I removed the carb and found the float chamber to be bone-dry empty. So my vote is now that there is crud in the carb, blocking flow into the float chamber.
On another related matter in the thread, there is mention made of a 'stuck choke' being at fault or contributing. Unlikely, I would say; These things use a fuel enrichment jet controlled by an electric solenoid ("bystarter valve") to take care of those chores, so there isn't an air restriction as you'd have on a true choke control...
If you do pull the carb to check the float bowl (and nearly every panel and screw on the upper stinkin' body), be sure to annotate where all the little hoses came and went; Mine is still down because of my impatience, and there does not appear to be a drawing or picture anywhere Google or Yahoo searches.
Chris/Roadster250
Chris
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Post by roadster250 on Oct 8, 2007 14:28:05 GMT -5
Jerglass,
I've got the same scoot, different stickers. The Mikuni vacuum pump and better fuel lines did nothing for my similar stalling problem. A universal electric pump appeared to solve the stalling issue, until I was 40 miles from home a couple of weeks ago. The electric pump appears to have pushed past some crap in the carb internal piping to the float chamber.
Shortly after verifying that the fuel pump was pushing fuel, I removed the carb and found the float chamber to be bone-dry empty. So my vote is now that there is crud in the carb, blocking flow into the float chamber.
On another related matter in the thread, there is mention made of a 'stuck choke' being at fault or contributing. Unlikely, I would say; These things use a fuel enrichment jet controlled by an electric solenoid ("bystarter valve") to take care of those chores, so there isn't an air restriction as you'd have on a true choke control...
If you do pull the carb to check the float bowl (and nearly every panel and screw on the upper stinkin' body), be sure to annotate where all the little hoses came and went; Mine is still down because of my impatience, and there does not appear to be a drawing or picture anywhere Google or Yahoo searches.
Chris/Roadster250
Chris
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