cr 125 wont run

CR SLATER · Nov 15, 2008

hi, got a 98 cr125, went out yesterday come back was fine trying to start it today and it just wont run!

it kicked in once and it was makin a strange ticking noise that sounded like it was coming from downpipe, then shut off! has not run since just keeps backfiring every now and again, had the plug out and seems like there is abit of gear oil getting there i think! :think:

also had top cap off today to replace gasket and piston seems slightly loose in the bore :coocoo:

any ideas? Thanks alot....Chris

Core87 · Nov 16, 2008

I would probably make sure it has spark and fuel for a start, then look at the reed valve, I had a broken reed once and had similar symtoms to yours.

helio lucas · Nov 16, 2008

i would start to look at the ignition magneto... to see if it´s loose... then clean the carb..
is the top end ok? other than the clearance? maybe a broken ring? or loose exhaust valve?

_JOE_ · Nov 16, 2008

Pull the cylinder. There's a possibility the piston skirt may have broken causing the noise and rocking piston.

CR SLATER · Nov 16, 2008

Core87 said:
I would probably make sure it has spark and fuel for a start, then look at the reed valve, I had a broken reed once and had similar symtoms to yours.

its getting plenty of fuel and it has a good spark, once its been kicked a few times and then take the plug out again its soaked! had a look at reed valve today its a boyeson one, and one side was abit damaged.

CR SLATER · Nov 16, 2008

helio lucas said:
i would start to look at the ignition magneto... to see if it´s loose... then clean the carb..
is the top end ok? other than the clearance? maybe a broken ring? or loose exhaust valve?

the top end looks ok, but exhaust is also filling up with fuel? :think:

CR SLATER · Nov 16, 2008

_JOE_ said:
Pull the cylinder. There's a possibility the piston skirt may have broken causing the noise and rocking piston.[/QUOTE

going to put a new piston kit on it anyway to be safe, what piston should i use?

CR SLATER · Nov 16, 2008

one more thing guys, one time it backfired it sounded like something shot out the exhaust and hit the garage wall! dont know if its just me haha, or if this could happen.

_JOE_ · Nov 16, 2008

CR SLATER said:
_JOE_ said:

Pull the cylinder. There's a possibility the piston skirt may have broken causing the noise and rocking piston.[/QUOTE

going to put a new piston kit on it anyway to be safe, what piston should i use?

Click to expand...

OEM, Wiseco, Pro-X. I've always used Wiseco with good results.

It is possible for something to be shot out of the exhaust.

CR SLATER · Nov 16, 2008

_JOE_ said:
CR SLATER said:

OEM, Wiseco, Pro-X. I've always used Wiseco with good results.

It is possible for something to be shot out of the exhaust.

Click to expand...

what would that be if anything,

Thanks

_JOE_ · Nov 16, 2008

Possibly a piece of piston skirt? Be sure to go through the power valve pretty meticulously, something may have come apart there also.

helio lucas · Nov 17, 2008

do you have a service manual? i will suggest you to get one before repair the engine... will be a great help... even before you order something...

do you check the magneto? o loose one could cause ticking and also backfire due the wrong timing...

if the reeds are damaged you must replace it...

CR SLATER · Nov 17, 2008

helio lucas said:
do you have a service manual? i will suggest you to get one before repair the engine... will be a great help... even before you order something...

do you check the magneto? o loose one could cause ticking and also backfire due the wrong timing...

if the reeds are damaged you must replace it...

to be honest its my first bike and i dont know much about them :(

whats the magneto?

Dirtymotonut · Nov 17, 2008

Otherwise know as a stator. Yours will be on the left hand side with a cover ,possibly a grey one. The stator is, as said above, a set of wire coils. As the bike runs a magnet spins inside the stator inducing an electical current in the stator. That current is an AC (alternating current) current. From there it goes to the rectifier which is a set of diodes that convert the AC current to DC (direct current) current. Then there's the regulator which is a circuit that controls the DC voltage output of the rectifier so that you will charge, but not overcharge, the battery, and also continue to run the electricals on the bike.

CR SLATER · Nov 17, 2008

Dirtymotonut said:
Otherwise know as a stator. Yours will be on the left hand side with a cover ,possibly a grey one. The stator is, as said above, a set of wire coils. As the bike runs a magnet spins inside the stator inducing an electical current in the stator. That current is an AC (alternating current) current. From there it goes to the rectifier which is a set of diodes that convert the AC current to DC (direct current) current. Then there's the regulator which is a circuit that controls the DC voltage output of the rectifier so that you will charge, but not overcharge, the battery, and also continue to run the electricals on the bike.

i think its best if i take it to a shop and tell them fix it lol :laugh:

Thanks alot for your help guys :cool:

justalonewolf007 · Nov 17, 2008

Just be prepared to hand out quite a bit of cash! Most shops will do a decent job, but check things over to be sure that nothing looks very odd.

CR SLATER · Nov 17, 2008

justalonewolf007 said:
Just be prepared to hand out quite a bit of cash! Most shops will do a decent job, but check things over to be sure that nothing looks very odd.

What do you mean?

cr 125 wont run

CR SLATER

Core87

helio lucas

_JOE_

CR SLATER

CR SLATER

CR SLATER

CR SLATER

_JOE_

CR SLATER

_JOE_

helio lucas

CR SLATER

Dirtymotonut

Crazy Ole Bag

CR SLATER

justalonewolf007

CR SLATER

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