nsr125 surprisingly wont start?????

[robbie21mcn]

this bike was running fine till i left it with my mechanic to do a paint job on it. it lay in his garage for about three weeks and when came out of the shop was working rok. on the way home from work one night i noticed the bike would not start on the electric but bump started right away. this started being regular and its never started from the electric start since about a week on it now just will not fire up. i was thinking electrical but i checked and there is a spark. also put the bike in first gear and covered the barrel and there is pressure as it pushed my finger off. the spark plug is doused in petrol when i took it off and inicdentally put a new plug in. anyone any ideas????? got fuel and a spark so why is it not firing???
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[Finglonga]

I take it you mean the starter motor is spinning but the bike wont fire up?

Does it do it after you have been on a run or is it all the time?

Try charging the battery, the starter may be using all the juice from the battery and not leaving enough to make a stong enough spark to start the engine.
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Andy Sez....
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[alains]

yes , after 3 weeks the battery is certainly flat
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[robbie21mcn]

no its a new battery in the bike had it less than 4 months!!! also put it on charge and fully charged it and it does not start. when i tried the plug outside the chamber there was a spark while the motor is still turning. im beginning to suspect something to do with the carb and the vacuum its supposed to have??? if i blow through the breather hoses on the carb the bike bump starts easier. its confusing as hell.
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fzr 600 its yellow but its no banana!!!!!!

[Blau Zedong]

I'd be surprised if the battery had anything to do with the spark, CDI ignitions on two strokes are usually self exciting.
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[six]

i had this problem recently with my RS50

It sounds like your engine is flooded to be honest.

Every time you try to start it, it is pushing petrol through the engine, if its not igniting, you will just have pure petrol going straight through.

I got a spark and everything, but the damn thing wouldn't start. Try jump starting it from a car. What you wanna do is connect it all up properly and just keep pressing the ignition. The starter motor should go round and whatever, and keep going round... but the bike may not start at first (mine took about 30 mins!!!). Eventually, hopefully, the petrol will be pumped through the system, and the bike should start. If you can turn off your petrol, now would be a good time to do it, before you jump it, lol. I had petrol just spraying outta my exhaust for about 10 mins when I got my bike started, but after that it worked fine, and today I tested it, and it starts electronically fine now (touch wood).

Sometimes leaving the petrol on for a while will let it run though. Also, everytime you try to start the bike, especially if you are twisting the throttle and using the choke, its just pumping more and more petrol through the system.

I hope it works out for you.

Tom
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[robbie21mcn]

not really as last night i got it started purely by bump starting it and when i got it goin it ran fine and idled perfectly. problem is when i kill the ignition and try to electronically start it wont do it!!! the minute i bump it. it springs into life again!!!
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fzr 600 its yellow but its no banana!!!!!!

[six]

[Handsome]

The only time I've had trouble starting mine it was down to the HT Lead, it would spark on the body but not start the bike...

Turned out that the inside of the HT Cap was shitty and there were about two strands of wire sticking out the top of the HT Lead and one was broken hence the intermitent spark...

I snipped the HT down about an Inch to get to some decent wire and cleaned the Cap with a flat bladed screwdriver, put it all back together and it's been fine since...

The only time I couldn't get a spark was due to a lead coming off from the bottom of the Coil.....

May be of no use but I hope you get it sorted.

Edit: Check the cut out switch/wire on the side stand aswell.
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Previous Bikes...Honda NSR 125 RR...Kawasaki Zephyr 550...Suzuki SV 1000 S...Yamaha FZ8...Current Bike...Suzuki GSX-R 750...

[Dilusi]

The fact it starts and runs fine without the starter means it must be something to do with the starter. If it was anything else it wouldn't start and run ok off a bump.

I think theres something wrong with your starter or starter circuit causing it to drain power so you don't get a decent spark when its in use.

[robbie21mcn]

but like i thought earlier in the post surely fuel and mixture may stop it working from the starter but not with a bump???
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fzr 600 its yellow but its no banana!!!!!!

[alains]

are you using the kill switch to stop engine ?
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the worst day fishing is better than the best day working

[robbie21mcn]

no i was not using the kill switch. i have just changed the accelerator cable and was thinking i may have upset it but surely it would not run with the kill switch on?? since i can bump start it fine!!!! the starter motor turns fine and i had the splug out and seen it spark so im lost with it. time to clean the carb out i think. it had been left for weeks which is usually when all sort of problems start with these things. one last thing is there anything that could stop the piston firing outiwith anything i have mentioned i.e. any electrical devices stopping it firing up???
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fzr 600 its yellow but its no banana!!!!!!

[alains]

i see , you probably have the genuine slow jet of 38 . i suggest you fit a 42 and when you stop ridding for a while , after switching the engine off put choke on and leave it .
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the worst day fishing is better than the best day working

[Blackwolf]

have you taken the spark plug out ant then ticked it over using the starter motor???
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Current: Ducati Multistrada 1200s

[crazymotorbik...]

Hey,

When i had my GPZ400R resprayed the tank got filled with some of the shit they use (Im not a paint expert but something got in the tank)

This 'Shit' managed to work its way into the carbs and blocked up the jets, so although the bike ran it ran terribly.
The same thing happened when my dad had his tank resprayed.

It maybe worth taking the filter out of your fuel tank and seeing what crud is on it.

Cheers,
Shaun.

[robbie21mcn]

had another look today and my bro in law reckons this thing wont start due to compression problems can this be so??? i never thought so since the machine runs and idles perfectly well once i get it bump started but now im starting to wonder?????
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fzr 600 its yellow but its no banana!!!!!!

[Marci]

What EXACTLY happens when you press the electric-start button?

A click?
A click and the whirr of the starter but the bike doesn't fire?
Nothing at all?

If it works when bumped, the bike itself is mechanically sound. Likely just starter switch, starter motor itself, or the starter solenoid...
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[feef]

the battery might be flat.. even a new battery left for 3 months can end up flat.

if you take out the plugs, and the engine turns over, but it doesn't turn over with the pluigs in, it could just be the battery doesn't have enough juice to overcome the compression.

Bumpstarting it proves it's not compression, plugs or anything else.

Check when it IS running that it's charging the battery.. running a bike with a knacked reg/rec means your running off the battery, and not recharging it..

a
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[robbie21mcn]

i can hear the starter going and its turning the piston as when i put my finger over the hole where the plug is it puffs air out and the plug has a spark. my brother in law said he reckoned the compression was too weak to start it but surely if theres any compression it will still ignite??? anyway its defo not the battery i have charged the battery overnight and had it full and still no starting up even tho it turns. then the minute you bump start it, wahey!!!!! it ticks over great???????
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fzr 600 its yellow but its no banana!!!!!!

[feef]

[st3v3]

I would try and use another battery to see if that works, if not, check the wiring around and behind your electric start button-type-thing, has something got a dodgy/broken connection? or come loose?
otherwise, you may well be looking at salvaging a new starter motor or something in that region, good luck
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[verastwin]

could it be that the starter motor is simply not turning the engine over fast enough to start the bike?

[Louise]

same with mine at the moment. Bumpstars fine. batt is fine, the eletric start just 'clicks', but its not turning anything over

[alains]

how do you know your battery is fine ?
download my file https://www.geneva-racing.com/~alains/NSRtips.doc and look chapter about batteries
when the stater clicks and does not turn the flywheel , it's 2 possibilities :
- starter relay is worn , due to too many electric arks when pushing button (contacts destroyed)
- starter motor needs to be cleaned with brushes & springs changed (it's quit simple , see my doc)
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the worst day fishing is better than the best day working