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Post by gtdezines on May 28, 2014 13:15:25 GMT -5
Hi 2T Scoot-Gurus- I need some help please!!
Have a 2003 Moskito- 72cc BBK- stock airbox- stock pipe- stock everything (except the BBK and main jet).
Here's my problem: Scoot was running great, yesterday on my way to work, it started sputtering at WOT, then ended up bogging itself down to a max of 25MPH. Ran like that for maybe 5 miles, made a turn onto another road and it died. Would not restart. Had someone pick me and the scoot up, but wasn't able to mess with anything yesterday.
Just a bit ago, I had some time to do some looking. Went to pull the carb to check the float and give it another good cleaning. When I pulled the vent line off the carb, fuel leaked out (of the vacuum hose) pretty heavily. It's never done that before and I know something isn't right. Pulled the rest of the carb, broke it down, gave it a good cleaning- even pulled the float and the overflow valve/needle/thingy and inspected and cleaned good (the rubber tip as well as the brass fitting it goes into looked OK on a visible inspection). Cleaned the rest of the carb, put it all back together- and it STILL won't start.
What next?!?
HELLLLLLLP! <please>
Thanks in advance!! gt
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Post by moofus02 on May 28, 2014 13:49:07 GMT -5
Vacuum diaphragm in petcock ruptured and it's sucking fuel through the vacuum hose and flooding
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Post by gtdezines on May 28, 2014 13:51:15 GMT -5
So that will cause the no-start then I assume, right?
BTW- THANX Moofus!!!
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Post by moofus02 on May 28, 2014 14:16:54 GMT -5
If it is pulling fuel down the vacuum line it will make it rich. Does the fuel flow to carb without vacuum now? If you suck on the vacuum line at carb end do you get fuel flow from both our either line. If you are getting fuel flow to carb without the vacuum you could plug the vacuum line and see if it will start. I would eliminate the vacuum petcock and put a manual shut off in line
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Post by gtdezines on May 28, 2014 23:06:39 GMT -5
Here's the current/stock layout of the fuel & vac/vent system: Bottom of tank- vacuum petcock- one line (vac) leading straight to carb. Fuel side, to manual petcock, to fuel filter to fuel inlet on carb.
I'd still need to buy something for the bottom of the tank to deliver fuel to the already present fuel line- but then where do I run the vacuum/vent line back to the tank. Or am I not understanding what you're saying.
ps: Scrappydog has the vac one for $15 plus shipping but my local Scoot sales/service/parts store thinks they have one in stock for around the same cost. I just have to yank mine (hopefully) tomorrow (as well as get a ride there and back) to see if they have one.
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Post by moofus02 on May 29, 2014 6:08:18 GMT -5
Engine vacuum opens the petcock. If you are getting fuel in the vacuum line the diaphragm in the petcock is probably ruptured and either not opening or not stopping fuel flow. If you already have a manual shut off you can take the vacuum petcock apart and gut it so fuel flows all the time and then cap the vacuum lines
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Post by gtdezines on May 30, 2014 9:54:28 GMT -5
Got a new vacuum petcock from the local dealer, installed it this morning. Fuel side is just fine (flows fuel with the line off while turning the engine over), and no longer any 'leakage' into the vent line.
Damn thing is *STILL* not starting.
At least I'm not working again for almost a week, I'll have time to mess with it and try to get her going again. Just sucks because it's my only mode of getting around (short of bumming a ride or borrowing someone's car).
This damn scoot aggravates the HELL out of me sometimes- that's why the first place I come for help is this forum!
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Post by moofus02 on May 30, 2014 10:13:51 GMT -5
Got good compression spark? Could be really flooded
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Post by gtdezines on May 30, 2014 10:30:59 GMT -5
It's been sitting since Tuesday morning because of the original problem.
After it died Tues, I did get it to fire a few times, although only for about 5-10 seconds. Since then, nada
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rpmcycleservice
Scoot Member
looking forwards to the zombie apocalypse!!
Posts: 50
Location: here......right here....
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Post by rpmcycleservice on May 31, 2014 1:25:24 GMT -5
another possibility is if it was flooded severely enough....if it had enough raw gas collected in the crankcase, when cranking, there is a chance that it pushed a crank seall out.....seen this a few times, but not too common...might be worth pulling the clutch cover, and variator off to see if theres any fuel coming past the seal behind it....stator side is a little harder to get to, but most times ive seen this happen its on the clutch side.....good luck dude!!
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Post by gtdezines on Jun 1, 2014 10:25:09 GMT -5
RPM- it started and ran a few times for about 10 seconds the day (Tuesday morning) it originally died out. I'll mess with it over the next day or so and hope for the best. It IS getting fuel and spark, so it's got to be something 'weird' I'd guess. Thankfully, I have until Thursday night to get her going again. If anyone else has any ideas, I'd love to hear!
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Post by moofus02 on Jun 1, 2014 11:15:48 GMT -5
Stop the fuel supply to carb hold it wide open and crank. If flooded real bad it might take off and run till the flood cures it's self. If so you know what was wrong. Return fuel supply and go?
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Post by craisin on Jun 2, 2014 9:17:05 GMT -5
they have it covered as far as i can see
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Post by gtdezines on Jun 4, 2014 11:01:50 GMT -5
Tried that, Moofus- cranked it on a full charge (in spurts not continuously of course) until the battery was dead. Still a no go.
It started last week a few times the day it died, but nothing close to starting since. Has me just about stumped.
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Post by moofus02 on Jun 4, 2014 11:28:47 GMT -5
Try taking the fuel line off the carb then pull the vacuum line and suck on it to make sure it is getting good flow. I've had a petcock gummed up or one with a ruptured diaphragm that doesn't open fully. Check compression. Pull fan shroud and check that it hasn't sheered a key on the flywheel and timing could be off. Take carb apart and clean with carb cleaner and compressed air. Check plug try new one. Check the condition of spark to make sure it has strong spark.
Sent from my SPH-L720 using proboards
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