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Hi

I was scootering latish last night and there was no traffic so i was going top speed for quiet a while and then after about 5 mins my scooter slowed down abruptly by as if it had changed into a lower gear and then about a second later it moved back into its normal acceleration, it was scary stuff, anyone know what is going on? 

 What sort of scoot???

 Daelim S5

Sounds like the brakes are failing on. That is very dangerous. You should take it to a dealer for inspection.

Check your spark plug.

 

Thats the strange thing i just took it in to get serviced just a week ago.... but i will check the spark plug see how it goes

It could be a vacum lock in the fuel tank. Sometimes the rubber seal in the petrol cap gets out of alignment and a vacum builds up in the tank. The fuel pump doesn't have enough power to suck against it and the engine gets starved for fuel. You back off on the throttle and eventually it rectifies scaring the bejesus out you in the process. Check the petrol cap.

 Doubt its the brakes, but it could be spark plug (even with a new one) or fuel starvation (including water in the fuel).  Give it a good run somewhere quiet and see if the problem reappears - note the conditions of it reappearing, and what you are doing. Have you been to a different servo recently?  Is the fuel cap on correctly (though normally if you have that problem it takes a longer while to correct)?  Is the gap on the spark plug correct?  What does the tip look like?

Sorry, lots of questions - but hard to diagnose without seeing it.

 

The only difference was that i was on my top speed for alot longer than usual continuous for 5 mins as i took a different route cos it was 9 at night and there was no trafffic. as for the sparkplug i will look tomorrow

Missed this one.

uniscooter13:

i was on my top speed for alot longer than usual continuous for 5 mins

Won't be the cause - The S-five has a rev limiter so you can't over rev it & we flogged ours mercilessly for 24 hours then 6 hours. More than likely some crap in the fuel. You are using regular unleaded?

 

Yep yep, oh and i fueled just before and I forgot to put on the fuel cap, just remember that i did that.

Its quite possible that you got a bit of moisture in there, but that its now passed through.  If there is a lot of water then you might not notice until you give it full belt then it will pick the water out from lower in the bowl in the carbie and you get dramas.  If you want to check for sure, then drain the carbie via the screw near the bottom and look at the fuel that comes out.  If you can see two distinct liquids, or what looks like bubbles (petrol and water don't mix), then you've got water in there. 

But if its stopped doing it, you may find that you are now Ok.  Water in fuel is a pain in the sphincter when it gets into your carby.