110cc Engine Slamming, wont start

[65cabriolet]

If you look real hard at the video, the chain starts to run backwards when the "event" happens... sure your timings not too far advanced?

[Jjcarrington]

We’ll it started without the chain! Sounds like it wants to run away and then after I killed the power it smelled like something burning…. Thoughts?

[david3921]

Originally Posted by Jjcarrington

I'm not sure about the neutral factor as there is no shifter or anything. So what would that mean?

I see this as a clue. There should be a shifter. It's usually located on the left side. It seems that you are starting the in gear. Also, it's normal that you have to engage the rear brake to turn it over.

Other observations... the exhaust is off and something is dripping out when you shut it off. Fuel? It's revving too high. Check the throttle. Is it stuck all the way open?

[Jjcarrington]

I have no idea where there should be a shifter. Since these small ones don’t have reverse I just figured they are automatic or a clutch that doesn’t need a shifter?

Good eye, I didn’t see the drip at first! After inspection it looks like one of the head bolts is missing a washer and I think that’s where the oil came out….


As for the exhaust, it is attached it’s just on the other side from this video. The throttle is not stuck open.

[Jjcarrington]

Is this where the shifter should go? It doesn’t look like it would connect to anything? Is there supposed the be a shifter? This is on the left side below the sprocket basically.

[TominMO]

Originally Posted by Jjcarrington

Is this where the shifter should go? It doesn’t look like it would connect to anything? Is there supposed the be a shifter? This is on the left side below the sprocket basically.

It's the short shaft sticking out the left side with splines on it.

[Jjcarrington]

I don’t think my photo uploaded. There is no shaft sticking out!

[david3921]

Originally Posted by Jjcarrington

I have no idea where there should be a shifter. Since these small ones don’t have reverse I just figured they are automatic or a clutch that doesn’t need a shifter?

Good eye, I didn’t see the drip at first! After inspection it looks like one of the head bolts is missing a washer and I think that’s where the oil came out….


As for the exhaust, it is attached it’s just on the other side from this video. The throttle is not stuck open.

I see the exhaust now but it's very loud. Is there a hole in it?

Pull the air filter off and look at the carbs throat. You shouldn't be able to see through the carb; the sleeve should be all the way down. If it's not, then there is something keeping the sleeve up. It could be installed backwards. It's easy to do.

Even small ATVs should have reverse but not all. I'll check tomorrow and see where the shaft comes out on my 125. On the video, it looks like there's a round hole below and rearward of the stator cover. Is there anything there?

[TominMO]

Originally Posted by Jjcarrington

I don’t think my photo uploaded. There is no shaft sticking out!

It could be a CVT auto trans meant for young beginners. Not meaning to be insulting, but I am supposing you know where a shifter should be from experience with other bikes, correct?

Looks like you're gonna be going inside. Think of it as an adventure!

[Jjcarrington]

Thanks everyone for the replies.

Yea, that hole is where my other 110 shifter is coming out of, but this one doesn’t look like it leads anywhere. I can try to upload the picture again tomorrow but it just looks like a hole. I don’t see it connecting to anything or looks like it’ll move if there were a pedal in it. What should the shifter connect to in there? If there were one, shouldn’t it go all the way through to the clutch?


I can look at the throttle cable tomorrow too, but I have done a bunch of carb work and highly doubt I did it backwards. Although it could be sticking up.

[david3921]

Which way is the sprocket turning in the last video with the chain off?

[Jjcarrington]

Hmm not sure, I shut it down quick because I don’t want to damage anything any more. I’m thinking most of you are right with a clutch problem, but idk if there’s suppose to be a shifter there or not. If there is suppose to be something there, that seems like a very obvious fix. If not, I’ll have to open her up again and…. Idk?

[Jjcarrington]

Does this link work for the picture of the gap where the shifter normally is? https://ibb.co/cTPFHXb

[david3921]

Originally Posted by Jjcarrington

Does this link work for the picture of the gap where the shifter normally is? https://ibb.co/cTPFHXb

Yes.

[david3921]

Originally Posted by Jjcarrington

Hmm not sure, I shut it down quick because I don’t want to damage anything any more. I’m thinking most of you are right with a clutch problem, but idk if there’s suppose to be a shifter there or not. If there is suppose to be something there, that seems like a very obvious fix. If not, I’ll have to open her up again and…. Idk?

IMO, you really need to get it to idle. Regardless of whether there is a reverse or not, the clutch is the noise you are hearing. It's getting slammed because of the high revs. If you can get it to idle, you'll be able to see which way the sprocket is turning. If it IS going backwards, then this tells you that there is a reverse and you are missing the shaft.