CR 125M Problem. No Grunt whatsoever

[YZ250H]

Help Please guys

Having trouble with my little CR.

Here's where I am at the moment
New Crank seals
New bore, piston and rings (not done by me)
GMC airbox with YZ85 filter
GMC pipe
Standard carb with standard jetting (clean)
New high voltage coil.  Ignition timing checked statically and with a timing light.
Spark checked OK with spark tester
new plug

The bike starts Ok on the kicker (second or third kick).  RUn "OK" and revs out well when not in gear. 
Trouble comes when you try to ride away.  It just dies in the arse completely.

I'm at my wits end with this beast.  Any ideas guys ?

I'm thinking maybe needle and seat ?  Ignition coils ??

[Billet YZ]

Try riding off with the choke on and see if this helps, if it does jetting may be to lean to start with.   Peter.

[YZ250H]

Didn't help Peter .  Tends to die even worse with the choke.  Fuely type stuff running out around the exhaust flange.

Flooding for some reason   I just don't understand the total lack of power 

Has a new inlet manifold and new boot from airbox to carb.  New clamps.

New kill switch - haven't checked that out yet 

[Davey Crocket]

Sounds like blocked jets.

[YZ250H]

Thanks John.  I will pull the carby off and soak it and blow it out again.
At this stage I'm prepared to try anything.

[Davey Crocket]

Soaking wont do anything Tony, you need to remove all the jets and blow through them to make sure there not blocked. While the jets are out write down the numbers and double check there the right ones. There a great little bike.

[oldfart]

Check rear air passage's that feed jets also.

[YZ250H]

Will do John.  Thanks for the tips guys.
Looking forward to riding this beast. 
I have had it for nearly 2 years and it's never gone properly.  When I bought a "runs well" bike of ebay it didn't even have spark.  The wiring was earthed and the timing was out 180 degrees.

Now I have time to look at it.

[bazza]

Blow out passages and jets
Rag from motor work stuck in pipe?
Correct piston?

[TM BILL]

Tony get rid of it and get yourself a KX 125A  rotary disc and 6 speed Elsinore beater 

[Tim754]

Umm how much do you weigh Tony sometimes a couple/few/shitload of later life kilos be squeezing the life song out of the little 125's

[YZ250H]

Tony get rid of it and get yourself a KX 125A  rotary disc and 6 speed Elsinore beater 

I won't say I haven't thought about it Bill.  I love those early tin tank KXs.  For me it doesnt matter how fast the thing is 'cause Im never going to win on it.  I could race my 465 in a pre 75 125 race and get my arse well and truly kicked

Umm how much do you weigh Tony sometimes a couple/few/shitload of later life kilos be squeezing the life song out of the little 125's

I'm only a little bloke at a spritely 85 kegs Tim .  She should be up to that you would have though.  I have ridden DJ's 125 X and Vandy's MX125 and had a ball on both of them.  Mainlines 125F was a hoot as well.

Blow out passages and jets
Rag from motor work stuck in pipe?
Correct piston?

Incorrect piston was something I had thought about too Bazza. 

I will give the carby a super thorough going over, check the float level again and see what comes out of that.

Thanks for the help fellas.   All the people on here have taught me a lot.

[Lozza]

Blowing jets out is a thing of the past $20 at Aldi you have a ultra sonic cleaner , 20 mins later they look like new with dirt out of drillings air will never reach. Use kero or degreaser find a little plastic tea strainer type holder for your jets.
Check the needle code, have you had it running before on that carby?

[YZ250H]

The main is 125.  The pilot is 60.  Standard.  I haven't ckecked the needle or the needle jet but will do.
Everyone looks to be focussed on the carby, so I will spend some time there too.

[bigk]

It's loading up. Was a problem when new, even more so now everything in the carb is most probably worn. You need to run a 45 pilot (they are hard to get) but this will still not totally eliminate the problem, or throw the Keihin over your shoulder & fit a Mikuni. A standard jetted 30mm will solve all your problems or you can go bigger if your engine is modified.
K