cbr125 wont start

[dave_bole]

Right im having a problem with my CBR125 2004. Its the carbed model.

Bit of background of what happened:

I was riding the bike home and it started to lose power, dropped down a gear and still kept losing power, indicated to pull in to take a look and the engine just died and had to push it into a side road.
Tried to push start it at the side of the road but it didnt work. (started for a split second but dies again).
When trying to restart the engine on the button, it turned over but the egine wont start.

Got it recovered to my house and checked the following things:

Full tank of fuel
Fuel and breather pipes dont seem to be blocked
Spark plug working fine
Battery is fine

A friend of mine thinks that the piston rings could be fried
Anyone got any ideas of what i can check?

[Noxious89123]

A new plug is worth a try; Cheap and easy. Is th HT lead in good condition? Is the plug wet when you take it out after cranking it over?
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'06 Honda CBR125RW-6 ~ '00 Honda CBR600F-Y ~ '07 Honda CBR600RR-7 ~ Bikeless
'53 Ford Ka 1.3 ~ '03 Vauxhall Astra SRi 1.8 ~ '52 Vauxhall Astra SRi 2.2 ~ '53 Vauxhall Astra GSi

[dave_bole]

Havent looked at the leads (don't know where to find them). The plug was wet when we took it out so we dried it and tried again but still no different

[Efes123]

[P.]

Double check the breathers. They are so long they get pinched damn easy.

New spark plug and trim a little off the HT lead and try it again.

[dave_bole]

but even with the fuel tank off the bike it still wont kick in for a second so dont think it would be breathers.

we tested the spark plug and its fine... as in, put some metal next to it and it sparked to it. So surely that rules out the leads and the sparkplug?

[P.]

[dave_bole]

i think we tried with finger in spark plugs place, my friend there was no compression really. Piston rings then?

or worth stripping the engine down?

[Budgetboy]

First make sure you have a good (BLUE) spark from the plug.
make sure your air filter is clean..
Then make sure the fuel is getting to the carb.
Take off the carb and clean the idle(pilot) jet and main jet.
Refit and try to start.
Fuel/Spark/Air are 3 of the things you need to make the engine run.. The 4th being Compression.

You need at least 100psi of compression to make an engine run (not inc things like outboards,mowers etc)
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[Teflon-Mike]

The symptoms when it spluttered to a halt SOUND like running out of petrol....

So start there.... ask the stoopid and obviouse FIRST.

- DID you have petrol in it?
- Did you stwitch to reserve?

No... OK... JUST CHECKING......

So you have fuel, is it getting to carbs... breathers dont suddenly kink... but 'sludge' in bottom of tank does swill up and clock the strainer, or the tap or the sediment bowl, or the fuel pipe, or the float needle port, or the jets....

Thats the list working down from the tank to where it gets into the engine, so worth through checking each link in the chain in turn, eliminating the possibility.

Once you are sure that the carb is getting fuel, and carb is delivering fuel to air-stream into the engine....

THEN come back and we can discuss, low compression, tappet clearances, piston rings, Head-Gasket failure or myriad other possible faults that much further down the fault-tree!
____________________
My Webby'Tef's-tQ, loads of stuff about my bikes, my Land-Rovers, and the stuff I do with them!
Current Bikes:'Honda VF1000F' ;'CB750F2N' ;'CB125TD ( 6 3 of em!)'; 'Montesa Cota 248'. Learner FAQ's:= 'U want to Ride a Motorbike! Where Do U start?'

[dave_bole]

There is no reserve tank switch on the CBR125 as far as i am aware.

How can i got about checking if fuel is getting to the carb?

[P.]

[dave_bole]

I will check all of the above mentioned at the weekend...

shall i let all the fuel out of the carb then try cranking it and check it again?

Is it possible i have flooded the engine?

[P.]

[dave_bole]

shall i let all the fuel out of the carb then try cranking it and check it again or not?