Scooter stopped in middle of road need advice

[groundloosers]

Ok so I was riding my scoot today to the local market when all of the sudden it stopped dead in the middle of the road. This weekend I recently installed an aftermarket exaust and header. I have a 47mm big bore kit and a open air filter. I tried restarting the bike to no avail. After waiting ten minutes it fired right up. While waiting I checked the oil level and as soon as I opened the dipstick oil shot out like a SOB. So I limped it home and swapped it from an 80 jet to an 87 jet and preformed a fresh oil change. Now it seems to be running again. My question is what could have caused it to suddenly die? Could it have been the aftermarket exaust with the 80 main jet? This has never done this to me when I had my other exaust on the bike.

[jackrides]

A quick die sounds like electrical. Describe the exact dieing sequence of symptoms. Sounds gruesome, but it helps diagnosis.
The oil spurt sounds like a blocked crankcase vent, which is typicly thru the valve cover.

[Zino]

Could you have a overheating issue ?
What does your spark plug look like ?

[scooterted]

Its possible its an overheating issue. With the stock carb and airbox with a 47mm bbk i was running an 88 jet.


With a non stock airfilter you would have to have a larger mj.


This all does depend on elevation (for reference, im at 300-400ft elevation). An 80 mj seems small to me, and a lean mixture can be a source of overheating.

[GrumpyUnk]

Gotta go with what jackrides noted. If it just stopped while seeming to be running fine with NO other symptoms, my bet is on a CDI or Coil or switch/connection problem. Chafed insulation on the 'kill' wire that is connected to the ignition switch, which allows grounding of that wire ANYWHERE along its length to bring the engine to a halt is a good possibility, as is a bare connector that touches the chassis or engine.
The windings in the CDI pickup can fail, and then generate nothing to operate the CDI nor coil. The coil can lose circut completion due to bad ground, bad wire, loose connection, etc. Time for a good close inspection.
The vent at the cam cover must/should be left open to atmosphere or to the intake tube as was set up at the factory in some machines. It should not be blocked, or you will be pumping your oil out the easiest way it can find. Or it will blow out when you remove the dipstick as happened once already. You can route the vent to a length of larger hose placed such that it will tend to keep any liquid drops inside, and let them ooze back to the cam cover after shutdown. It should be open or vented through a sponge/air filter material to allow fumes to escape, but not drops.
tom

[SMALL CC TEK]

Nov 4, 2019 0:02:10 GMT -5 jackrides said:

A quick die sounds like electrical. Describe the exact dieing sequence of symptoms. Sounds gruesome, but it helps diagnosis.
The oil spurt sounds like a blocked crankcase vent, which is typicly thru the valve cover.

Oil under pressure  colg  crankcase vent or someone just flat overfilled it. That overfilled  crankcase could have cause the  motor to stop running at idle  easy.  

[groundloosers]

I don't know what happened but I did a fresh oil change and filled it to the correct level and no problems so far, will let you guys know if anything else comes up.

[cagiva4ever]

i would suggest the 2 most common issues:

1. a failed Vacuum fuel petcock (if you have a Stock configuration, all stock fuelline parts), it has leaked fuel through Via open Int valve at stand still over night/day and filled your Crank Case with Fuel.

Did the used motor oil smell to Fuel/petrol ? was the oil very thin Due fuel in it ?

2. Crankcase pressure stopped the engine, piston wasnt able to travel into BDC and engine locked up stalled.


it will be easy to Verify the Vacuum petcock operation, faulty or not.