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Can I rule out incorrect setting of the timing chain/sprocket/cam? If the cam was incorrectly set by one tooth on the sprocket/chain would it run so well at idle and up to half throttle?

Don't remember the part number off hand, but it's a brand new yausa. Same bat it had in it before I took the motor apart and it ran fine. I even unhooked all the lights and ran it with a 12v battery yesterday (google search cb125 12v conversion, totally kosher to do), starts and idles way...

ugh! Kinda over it :( wish I didn't touch it in the first place.

Just ran it with the timing light. The static pointer is dead on the T mark at idle. When you rev it up timing advances to the left hand of the two timing marks. It strobe doesn't miss or anything when you start to rev through the bogs so I guess we can rule out an ignition issue.... That damn...

Right but can I rule out incorrect setting of the timing chain/sprocket/cam?

If the timing (talking about the timing chain/can sprocket, not the points plate) was off one tooth in either direction, then the engine would run like crap at all throttle settigs righr? I was to rule that and/or anything else that I may need to disasemble the engine for.... like i said it...

I converted it to the radioshack one a while ago....

Tried it. No change. We can rule out the timing being off when I set up the cam sprocket right? Would it idle and run from idle to just under half throttle so well if it was off? I have also tried different points plate positions to change the timing either way (now back to stock position)...

Yea I did a compression test the other day. Rock solid 155psi. Charging system issue is def a possibility, and thats where things start to get confusing. This bike has a funky 6 volt electrical system. Won't run properly without a battery, burns out highlight bulbs if you do try to run it...

Lets say it does fall beyond these marks, then what? There is no adjustment for that correct?

It is impossible to get across what is going on via a forum and not having an experienced person here to help is so incredibly frustrating. I just hope this has happened to someone else at some point and then chime in, otherwise I'm going to have to give up and throw it in the garbage.

LOL yea no kidding, thats what I am saying! It's not something simple here. I am an experienced enough mechanic to follow the maintenance manual and check everything it points to. I have jetted many a carberated bikes, rebuilt engines, on and on and on. So frustrated.

But if you just rev it in neutral it stumbles exactly the same at a standstill as it does moving, under a load, no smoke. You can advance the throttle slowly and as it revs, it begins to stumble (sounds and feels EXACTLY like a rev limiter in a car) from exactly half throttle to full. You can...

Can you elaborate on the procedure for this? That is a bit beyond my maintenance manual. I used the timing light to see where it was at idle. Its a bit of a pain to try to use the light with that stator cover off and the bike running. I checked the movement of the advancing mechanism and it...

Yes, I have done this and the plug condition looks lean. Light grey color on the plug. Same results with main jets 95-115. 120 and 125 produce a darker color and a bit of a wet plug. Again, if it was missing that bad because it was so rich wouldn't i get some smoke?

The plug would end up all dark and fouled though wouldn't it? Perhaps smoke out of the exhaust? Others have done the same conversion I did and only needed to go up a few jet sizes. If the timing was off, would it start and run beautifully until half throttle? The only reason I am not 100%...

I had a perfectly good running cb125s which I decided should have a 145cc cylinder and piston on it because at the time I was bored and needed something to do. Got the engine back together and back in the bike and for the life of me I cannot get it to run right. Starts and idles perfectly and...

Hey all, Splitting the cases on my CB125S. The two bolts holding the oil pump housing on are stuck pretty good. I've got the right phillips head bit and even hit it with my impact gun. See the pic attached. I don't want to bugger it up anymore that I already did. Do I even need to remove this...