wondering if anyone could assist in where to look at for the issue i encountered today as i hope not for it to happen again especially during heavy traffic

was riding for 20 mins in traffic, at a stop the bike just died suddenly. Start up the engine twice but it stayed at 1k rpm refusing to increase rpm for 1 sec and died again. hit the kill switch but dash and lights all remained on despite the flipping the kill switch (which should cut all power to the bike)
turned off ignition key and push the bike to the side of the road and waited for 2 mins before starting it up again and continued my journey, bike performed as normal as though nothing happened, no choking no nothing. no delay in starting up the engine as well

CB250R, mileage 20k, serviced according to schedule and temp was normal when it happened.
where should the mechanic look at I've no idea

Last time my zx6r had fuel pump problem. Similar to this.

If the mechanic needs you tell him what to look for, maybe start to find a new mechanic. Lol.

Probably fuel or ignition related. What's the mileage on the bike?

Check spark plugs, maybe do a compression test. Check fuel.pressure.

This post has been edited by jaycee1: Oct 5 2024, 09:31 PM

21000 km boss

kill switch and lights all on? by "kill switch" do you mean the key? or just the right side handle button?

1k RPM upon starting is quite low, that's why it refused to rev up, and I'm agreeing with the comment, could be fuel pump issue, or:
- gas cap vent blocked
- do you habitually overfill petrol every time?
- any recent service items?

- do you habitually overfill petrol every time?-
yes, i figured that might be the cause of the issue, did that total about 10-12 times (about 0.5 - 1 litre additional after the fuel reaches the metal bar that blocks the nozzle from entering)
no recent service items, just regular service interval oil change (mileage 21k)

overfilling petrol will lead to fuel pump damage right?

rode around town today (low- high rev) to see whether it happened again but it didn't, should i get it checked or wait for it to happen again before sending it in?

This post has been edited by ExCrIpT: Oct 6 2024, 09:09 PM

not pump damage, I'm not entirely sure how our EVAP system works, but it might be something to do with
it sounded like 'rich' fouling, with too much petrol fed to the engine
hope nothing is wrong

For me, if bike works after a while, it is usually related to engine temperature / overheating. What does they temp gauge say?

1. Spark Plug coil / coil
2. Fuel pump
3. Starter
4. Weak battery
5. Charging coil
6. Electrical / Electronic fault
7. Cylinder head (low pressure)

... the list goes on.

Best to take to a realiable mechanic or if the bike is new, claim warranty.

If the mechanic do not know where to begin or logically check after you explained the symptom, i think you better high tail out of there and find another one.

happen to me couple of weeks ago, suddenly loss power and drop few rpm then engine died off, can crank but cant start. at time, it can start but died off after few second.

checked all from ignition system to electrical, ended up it was faulty VDS (vehicle down sensor).