Why did I get a two stroke...

[Milo]

Well I'm in work and my lil 100cc 2-stroke won't start.
It started initially but then navigating a security barrier i let the revs drop and it cut out and hasn't started since.

I've tried the kick start many times and also bump starting it but it doesn't sppear to be firing.
I've tried swapping the spart plug (which was quite oily) but still nothing. It's sparking so I'm really not sure what the problem is.

Any suggestions?
And no - it's not out of fuel

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[Hex]

[Stu_666]

Not that I pretend to be shit hot with bike mechanics , but with the RS125 I'm thinking of getting you have to let them warm up a wee bit before going off. I'm guessing you probably already know that though. Have you checked obvious stuff like the battery etc. That's what I normally do with me car when there's a problem and its normally something really simple and obvious...maybe

[Milo]

The battery's fine as the neutral light is fine and it's sparking.
The fuel is on and it was running fine when it was parked - and when it started initially.
When I got it there were a couple of spare plugs. I've tried these and it's the same with each.
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Shaft drives rule.

[Jammy-G]

Try the new plug, bump starting it with the fuel OFF. This is what I do when my bike wont start, When it makes a half hearted effort, whack on the fuel and bump it again.
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RooRoo: just like the time i stuck my finger up my arse with no lube at all and she didnt talk to me for hours

[Mr Pants!]

Two things required, a spark, which you have proven is present and fuel getting through. Have you checked that?
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Mr Pants! (Alex or Al)
Its better to burn out, than to fade away....

[Smoto Bob]

choke?? kill switch spring to mind lol

then spark/fuel

its a 2 stroke thats a good thing cant be many thigns
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[mrchips]

Take the plug out and give it a few kicks to get all the petrol out of the head.

[Azmodeus]

It cut out when you let go of the throttle?
and now it wont start?

Hmmm... sounds a lot like what is wrong with my bike. May be that the float in the carb has gone.

[Robby]

Does it run a fuel filter?

Its an old bike, it'll have shit in the tank that could block the jets if its not got a filter.

[Wave2k]

ahhh the joys of the 2-stroke
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Ducati 1299 Panigale
2009 Corvette C6 z51
RS125->CBR400->RXS100->GSXR750K2->Ducati749S->CBR600RR5->TL1000R->DRz400->RSVR1000->Honda VTR SP1->CBR400->GSXR1000K6->Honda H100->CBR600RR3->Ducati1299

[Claud 14.7 to 1]

Yeah i'd aggee with Robby, and check lines, clean out the tank. Basically check there are not blockages/problems though the whole fuel delivery system, including the carbs. But do the carbs last.

Clean out the tank, check hoses, filters, fuel tap etc. Mine cut out just like that, when the fuel pump finally packed up. You probably won't have a fuel pump, but you may do.

Doing all of the above certainly wont hurt it, may even fix the problem.

[stinkwheel]

This'll be way too late, but you probably flooded it. Fuel off, choke off, ignition on, throttle wide open. Now kick over until it fires, quickly switch fuel on.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[JonB]

Sounds like a classic flooding to me, Leave it for 5 minutes and what works for me is to pull the throttle back ever so slighty just to let a trickle of fuel into the ignition area and just push in the ignition and hold for a little while, should fire up shortly after.
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[Milo]

Thanks for the replies everyone. Finally managed to get it started by pushing it around the small car park outside my work many many times with a mate to help.
Still unsure what caused the problem, though I assume it was flooded. Each time I changed the plugs they seemed very oily.
Very annoying bike to bump start - you can't push it along and then release clutch because it's light and will just skid.
I'll give it a thorough take apart and put back together soon.

cheers
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[G]

You should try bumpstarting a dr600 or a high compression zx9... it skids, but not because it's light. Put it into second and it should be fine.

If you're actually bump starting it to start it rather than clear it out, then I'd just run along and jump on it.

[Milo]

[stinkwheel]

If it is something like an H100 or an RXS or that kind of thing, you should bump start it in second. That way you can just sit on the saddle with the clutch out and paddle it about with the engine turning over.

You can start my H100 by sticking it in second on the stand and pulling the back wheel round by hand (NB fingers, spokes etc!).
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.