Scooter keeps cutting off while driving By lazerorca (Read 28,143 times)

[lazerorca]

Thanks guys... I have one more question... how much flow should I be getting through the fuel filter? The filter is in between the tank and the petcock. when I unplugged the fuel hose going into the petcock... a slow drip of fuel comes out. is that enough?

[JR]

No a drip but a steady flow. Your petcock may be OK and the the filter just stopped up? Pull the line before the filter and see if you have a good flow of fuel.

JR

[lazerorca]

it is flowing. Ugh... I tore down this whole scooter for a fuel filter? I guess it's a learning experience. I do have to say that, I have learned a lot from all of y'all's advice. if the petcock does go bad, I'll know next time. Before getting this scooter, I would always take my truck to fogg's at home. They are pretty straight up and cheap in comparison to other mechanics, but it is certainly cheaper to do my own repairs. The motorsports shop in town is so ridiculous. I popped a flat, and they charged me a full hours labor to change my tire. There is no telling how much it would have cost me to have taken this in or even worse, gotten them to do a new wiring harness that you generously helped me out with.

[lazerorca]

I put in the new fuel filter... it is running again... but the idle is "pulsating"... it kinda revs up and down... and it doesn't have as much spunk and top end. I did clean the carb. Would some of the adjustments be out of whack?

[tvnacman]

have you done a valve adjustment ?

John

[JR]

Good advice sounds like it needs a valve adjustment and the how to is in the tech section step by step with pictures plus we have it in the video section.

I would do that and if it is still running rough Alley will walk you through the A/F adjustment.

JR

[lazerorca]

thanks guys... I'm looking at the video now

[lazerorca]

Valve adjustment?

[alleyoop]

Well if the idle is bounceing that means it is running to LEAN. But before you adjust the carb to settle it down I would first adjust the Valves. Reason is if we adjust the Carb now and then the Valves it will throw the Carb adjustments off.

But if you want to try adjusting the Carb first that is ok.
Here is how to get your carb adjusted:
Alleyoop
When adjusting the Fuel Ratio Mixture, you want to adjust it AFTER it is nice and warm at least 5 minutes idling so the ENRICHER cuts off the extra fuel otherwise your adjustments are for not.

Now when adjusting it on the center stand you want to get the HIGHEST IDLE adjusting the Fuel Ratio. So from where the screw setting is currently at:

1. Turn it 1/4 Counter Clockwise and wait about 10 seconds or so to allow the motor to adjust to the new setting and LISTEN:
a. IF the idle goes up REPEAT 1... Until the idle DOES NOT go up or nothing happens Then turn the screw CLOCKWISE 1/8 of a turn, GO TO #3.
b. IF the idle goes down or does nothing Turn it CLOCKWISE 1/4 and go to #2.

2. Turn it CLOCKWISE 1/4 turn and wait about 10 seconds or so to allow the motor to adjust to the new setting and LISTEN:
a. IF the idle goes up REPEAT 2... Until the idle DOES NOT go up or nothing happens Then turn the screw COUNTER CLOCKWISE 1/8 of a turn, GO TO #3.

*** IF TURNING THE FUEL RATIO SCREW IN EITHER DIRECTION DOES NOTHING YOUR PILOT JET and OR PASSAGE are CLOGGED and you need to Clear them***

3. Now that the IDLE is up higher you may need to lower the IDLE USEING THE IDLE SPEED SCREW so that your REAR WHEEL is NOT SPINNING.

4. Now give the Throttle a QUICK twist and the RPMS should climb up quickly without hesitation or bogging and come down to where you set your Idle at.

If it still stumbles or hesitates you most likely have an air leak somewhere. In that case take a picture or several of the Carb area and the hoses.
Wile

[JR]

Jul 1, 2012 15:40:46 GMT -6 lazerorca said:

Valve adjustment?

Periodically as routine maintenance the scooter will have to have the valves adjusted, not hard to do but you will need a feller gauge.

JR

[lazerorca]

which video shows me how to do a valve adjustment?

[lazerorca]

Ok I found the video. the guy was a bit ambiguous as to what setting to put the valves. he mentioned 2 thousandths of an inch all the way to 4 thousandths of an inch. what would be effect, let's say for setting your valve at 2 thousandths of an inch as opposed to 4 thousandths of an inch.

[OMN]

generally you want to adjust them toward the loosest tolerance/largest value. in this case, closer to .004 is better than .002 or less, for a couple reasons.

first, smaller valve clearances mean there is a higher chance the valve won't seat properly, resulting in loss of compression, therefore loss of power. when you get toward no clearance at all, meaning the valve is always open to some degree, combustion happens around the valve and burns it up. not a good scenario.

now having too much clearance can mean the valve doesn't open far enough to allow proper intake/exhaust, as well as the engine runs a little noisy because the valve tappets are "slapping" the valves open.

on these scooters (mine as a recent example), you want to be especially sure that the exhaust valve has enough clearance. for whatever reason, if that clearance is off, the scooter will probably die at stop signs. i don't completely understand the theory behind that, but it's definitely fact!

you're in the right place to get advice on keeping that thing running.
cheers!
ron

[lazerorca]

The scooter is not idling at all right now. one thing that I noticed as well is fuel is in the vacuum line leaving the petcock... I am to assume that where it is labeled "in" that is where run the line from the gas tank... where it says "out" that is where I run it to the carb... and the one not labeled is the vac line correct? It is a small drip of gas...

[lazerorca]

Well I just drove to the auto parts store. Barely made it. got a fuel shutoff for a lawnmower and a vacuum cap to put over that little nipple where the vacuum line was running up to the petcock. it drove a whole lot better, but the idle is still messed up. I also got a feller gauge. I am going to work on the valves after doing a little more reading because I really have no clue what they do and what I would be doing.