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| < Engine Clinic - Mini Off Road Buggy ~ Fuel Problems..... |
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Okay, I checked the intake for leak, that looks good no leaks. I tighten the coil wire just a bit. I cleaned both of the jets and they appeared to be okay. I cleaned the spark plug which was black with carbon. I tried it out and it bogs down at take off and has a little more power not quite what it was before. I think now I have to mess with the oxygen/fuel screw on the carb. Any other ideas. Also the jet on the carb is a 110.
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| franky wrote: |
| Okay, I checked the intake for leak, that looks good no leaks. I tighten the coil wire just a bit. I cleaned both of the jets and they appeared to be okay. I cleaned the spark plug which was black with carbon. I tried it out and it bogs down at take off and has a little more power not quite what it was before. I think now I have to mess with the oxygen/fuel screw on the carb. Any other ideas. Also the jet on the carb is a 110. |
franky thought cleaning the jets would have done it and sort of figured that your plug would have been black do to the bad vacuum petcock
i take it your air filter is good and clean and nothing in there restricting the air flow.
also you might have a bad fuel inrichment (choke) that is not shutting off when engine warms up. along with others i had a bad one and converted to manual with the bolt and BIGE has got a cable operated chokes you can convert over.
here is how you can check it and good luck thats all i can think of
pud
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2006 sunl 150b
Dr. pulley 10 gram sliders, 1500 torque spring,39 tooth sprocket,2000lb winch, red neck uni filter, 125 main jet at 1,450 elevation, drilled out exhaust,ngk iridium plug,performance intake
trying a set of 10gram rollers now
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First off a 125 jet with a 1/12" uni filter(in stock) and gutting the muffler will make a huge difference on a stock engine. Plug being black will be due to rich mixture.Yes the choke will cause this,usually if bad the kart will start fine and run great,as it warms up it will run progressively worse.This is an easy check,first though you want to check for power to the choke,this would be checked where the unit plugs into the harness you should have between 9-10 volts but I have seen some at 12.You also should check that you have ground at the other wire usually blk. or grn. in color by use of an ohm meter. If you find to have a good ground and pos. voltage to the choke the next step is to physically pull and check the unit.To do this unplug the choke from the harness than remove the one phillips screw which holds the choke via a half moon clamp,than firmly pull up on the choke to remove.To check ,the choke must be cold. Than connect via jumper wires connect yellow to 12v source than blk. or grn. wire to neg.of the battery than for the next 3-4 minutes watch the needle expand until the spring inside the body is fully compressed body of the choke will feel hot to the touch which is normal and indicates a proper functioning choke.This whole process will take between 15-30 minutes depending on level of experience.Most of the time 99% of the time an inoperative choke problem is due to no power to choke due to loose or broken connection and the loose connection usually occurs when carb is removed and reconnecting either pin is pushed slightly out of the plug causing the broken connection however if the choke is bad the replacement from Big-E would be a good choice TOM
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GUNNUT
SYCARMS;Blade Karts,ATV's Parts,Service,Performance Parts & Accy's
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To add to Tom's troubleshooting: When measuring choke voltage on the buggy, make sure you are using the AC volts scale. The power is coming directly off one of the stator phases, so you will only get an AC voltage if the buggy is running.
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08 Joyner SandViper 250
07 Joyner SandSpider 650
06 Tank Urban Touring 150SE
04 Yerf-Dog Spiderbox 4209 GX150 (SOLD)
04 Yerf-Dog Spiderbox 3206 GX150
81 Honda Passport C70B
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Okay, I checked the voltage on the choke and it's okay. I removed the choke and it seems to be working fine. I dont know what else I could check since it idles good but once you get it going it starts to bog down. Any more advise.
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| franky wrote: |
| Okay, I checked the voltage on the choke and it's okay. I removed the choke and it seems to be working fine. I dont know what else I could check since it idles good but once you get it going it starts to bog down. Any more advise. |
franky does your buggy have a snorkel on the air box?
did you do any adjusting on the air fuel screw?when you started having problems.
the fuel filter is it turn the wright way for fuel flow? there should be a arrow on it,arrow should be going towards the carb.
could you have gotten water in the fuel filter thats now trapped in the paper filter and not letting gas through?
vacuum lines are they good no splits in them or a blockage inside of them,also check gas line to.
when you check intake did you spray carb cleaner or starting fluid around it and over it while idling? to see if engine sound changes or dies out.
from what you have said it either not getting any gas.
a vacuum leak.
or your not getting enough air.
pud
_________________
2006 sunl 150b
Dr. pulley 10 gram sliders, 1500 torque spring,39 tooth sprocket,2000lb winch, red neck uni filter, 125 main jet at 1,450 elevation, drilled out exhaust,ngk iridium plug,performance intake
trying a set of 10gram rollers now
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PUD,
No snorkel on the kart.
I did mess with the fuel/air screw (this could need adjustment)
The fuel filter is the right way.
No splits on the vacume or gas lines.
The kart idles good, it takes off okay while running you go of the gas and rev it up it bogs down.
I only visually inspected the intake. I need to try the recommendations you made on checking it.
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PUD,
No snorkel on the kart.
I did mess with the fuel/air screw (this could need adjustment)
The fuel filter is the right way.
No splits on the vacume or gas lines.
The kart idles good, it takes off okay while running you go of the gas and rev it up it bogs down.
I only visually inspected the intake. I need to try the recommendations you made on checking it.
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Opps... I didn't mean to post the previous reply twice.
I gutted the muffler, changed the spark plug and cleaned the carb completely. It made a bit of a difference and was working fine. After a while it began to bog down not as much but its noticeable and bothersome.
My next step is to change the jet and replace the stock air filter with a uni filter. I am hoping this will correct the bogging down issue. any other suggestions.
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| franky wrote: |
Opps... I didn't mean to post the previous reply twice.
I gutted the muffler, changed the spark plug and cleaned the carb completely. It made a bit of a difference and was working fine. After a while it began to bog down not as much but its noticeable and bothersome.
My next step is to change the jet and replace the stock air filter with a uni filter. I am hoping this will correct the bogging down issue. any other suggestions. |
how does your buggy sound since you gutted the muffler,can you here the monster trying to come out. 
did you pull your new plug out after running it hard with the gutted muffler to see how it was running might be lean now.
hopefully cleaning your carb good solve your problem and your just running lean now.after the uni-filter and finding the wright jet to match maybe this will take care of the bogg.
pud
_________________
2006 sunl 150b
Dr. pulley 10 gram sliders, 1500 torque spring,39 tooth sprocket,2000lb winch, red neck uni filter, 125 main jet at 1,450 elevation, drilled out exhaust,ngk iridium plug,performance intake
trying a set of 10gram rollers now
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