Dead Honda?

[Guest]

Hi all, just done the unthinkable and killed a Honda CG

engine will turn over

thumb over spark plug hole tells me there is compression

there is a spark

Posible diagnoses: broken woodruff key, allowing timing to slip.

Water in the carb, coil breaking down. (although none of these would account for the smell)

Engine will start but only on full throttle and then runs very poorly

Failure occured after "traffic light drag racing" i turned off at the lights,

20 metres later throttle actuation has no effect on engine rpm and a foul smell is present.

Essentially i'm a skint student with basic mechanical knowledge and a distinct lack of tools looking for some pointers.

The motorcycle in question is a 2005 Honda CG125 (electric start/ front disk brake)

I would be grateful for any serious input.

[eastanglianbiker]

if you think it might be the timing slipping then remove the left hand casing and see if you can turn the rotor by hand without the engine turning then if it isnt thats not the problem if you say it now smells like burnt metal you could of damaged the big end or main bearings on the crankshaft

[mealexme]

I'm no mechanic, but sounds to me like a clogged fuel line or possibly a hole in the fuel like somewhere. is the smell petrol?

if not I give up lol

[Adam]

Have you checked your engine oil recently? It's always best to start with the easy things!

[GazW]

It's never the end of the world either pal, I bought an engine off eBay for a cg125 swapped it over and sold the broken one as spares & repairs for £50.

[pointblank0]

Could be a stuck float in the carb maybe?

[Guest]

Update.... Spent the day with the engine out of the bike in pieces, eventually check the carburettor.... the pilot jet had fallen out. I enclose pictures for your amusement

[eastanglianbiker]

expensive lesson learned to check simple things first but it looks like you had fun

[Guest]

Fun might be a slight exaggeration, but i learnt a lot about how she fits together which is always a bonus, up to now my mechanical knowledge was limited to cars and 2 stroke crossers

[Karimura]

Hope you stay around after your help

[Guest]

Long time lurker