Hi everyone, My 2001 zzr 250 turns but wont fire. It sat in the garage for a week, i went to take it out and encounted this problem. It has new plugs (spark), fuel and the battery is 6 months old. The motor was rebuilt 18 months ago and has only done about 25,000ks since then. It has had me puzzles for the last 2 weeks.
I don't know the zzr250, so bike agnostic questions. Did you turn the gas on? Is the kill switch in the run position? Was the gas left on?
The kill switch is in the on position. And the fuel only has pri, on and res on it. the motor turns but wont fire.
after a week, the fuel bowls should still be full, you could try switching your fuel tap to prime to refill them if they are empty, but I doubt it, but I am hazarding a guess that the plugs might be fowled. When you try and start it, are you using full choke and no throttle ? Do you have an inline fuel filter, perhaps that is blocked ? If you can, pull a spark plug and see what condition they are in. Lots of cranking with some throttle will blacken a plug quick smart
Take out one of the spark plugs, plug it into the cable and hold the side of it against something grounded on the bike, then run the starter and watch the plug, you should be able to see a blue spark as the motor is turning. Try this with both spark plugs and if both are working then its likely a fuel problem if the bike was running before
Ahh no ... dont 'hold it' ...... rest it on the head so it will ground .... keep your hands well away Do these 2 things ... http://2fiftycc.com/index.php?threads/how-do-i-test-my-12-volt-battery-and-charging-system.1794/ http://2fiftycc.com/index.php?threads/trim-your-spark-leads.8032/#post-79736
it's called the EX250H in the us. just an old fat ninja 250 i always just hold it, the jolt isn't that bad but yeah, expect to get shocked if you touch the plug directly while the engine's spinning
It has a blue spark from both plugs. It has half a tank of fuel. I have checked all the fuses and have found that the airbox is not connected to the carbies, i am starting to think this might be its problem, its not easy to get them to go back on
Smear a bit of rubber grease or WD40 or Inox on the inside of the rubber boot where it goes onto the carby should start with no airbox
I will give it a go. Yes i know it should start without the airbox, but this is the only thing i can find
No luck re-attaching the airbox to the carbys. The top of the rubber goes on but the bottom wont go on even with the use of wd40
if both plugs are sparking and there's no way the wires could have been swapped around at some point, i'd check the fuel filter to see if it's clogged, essentially just make sure there's fuel getting to the carbs and also that there isn't any water or anything in the fuel system when i had my zzr250 it was often a real pain to cold start, i'd open and close the throttle, then give it the starter with no throttle and no choke, then do it again with more and more choke until it fired up. would usually work on 2/3 choke and no throttle, it didn't like to start with full choke. could've just been something particular to my bike though as it had 90000km on it
No crossed wires Filter not clogged and fresh fuel At the moment has is sitting here without the tank and the battery, still trying to attach the airbox but still no luck
battery might be too weak or valve clearances might be too loose or tight when cold, can you try a push start?
I dont know how to check the valves, and i cant push start it as i have never done it. Thanks for all the advice it is appreciated.
My bet is a compression issue due to valve clearances. it having sat stone cold for a week and the airbox not fully sealed will have exacerbated this. What got done in the rebuild?
also with getting rubber things to fit when they don't want to, sometimes it helps to heat the rubber by submerging the rubber bits in very hot water (make sure to dry it off well before putting it on the carbs though) warming up the rubber can make it stretch and deform more easily, this is more of a last resort though if you still can't possibly get the airbox on
It sat in the garage for a week. The engine was fully rebuilt all internal parts were replaced and the valve clearences and carbies were done at the local bike shop.