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Yes. The key fits and everything, I went to put the new jackshaft (pictured) in the assembly and it went right in through the bearings and came out on the drivetrain side. But when I tried to fit the sprockets on the jackshaft they would not fit and it feels like it’s literally .5 mm worth that...

ok so the new jack shaft came in…but the diameter is like, maybe 1/64 an inch bigger than the sprocket and so it won’t fit. Do I need new sprockets??

Shoot well I already ordered the new jackshaft. Does a torque kit come with the jackshaft?

So this would be what I should buy?

Yes key sorry

Ik it’s dirty I’m gonna clean it all up, but I’m guessing my set screw should probably be the whole length of that groove…

Ok thank you I’m going to try this out tn

I’m located in Bozeman MT. Yea it’s hard to describe. The engine runs perfectly like it starts right up with the choke open and then I close it like I normally would to drive and still it runs great when I give it gas and revs up. Both chains are on front one spins, but the back one doesn’t...

Ok cool thank you as well for the diagram. Do you think if this isn’t the problem it will most likely be the choke?

How would I check for that?

Im near Bozeman. Ok I think I might try this route cuz the chains are on fine and they’re even spinning fine so it’s not them. It just feels like something is not engaging and when I first had this problem when riding it that’s what it felt like, something disengaging and not being able to...

https://youtube.com/shorts/Hx7KNt382bU?si=NcCAr4pnw24rtvrI here’s the link for the video I just posted of it running, sorry for the inactivity I put it away for winter as I live in Montana and don’t have a garage to work on it.

Is that just that silver nut on the driveshaft? I have that tightened properly and just oiled it like these guys suggested

Ok so this worked like barely revving it, but as soon as I tried to start riding around it sounds like something is almost catching internally and the whole thing kinda like jumps. It feels like it’s just revving when I gas it. And it makes a bad sound I wish I could post a video of it because...

I just did because I wanted to but yes I did get it new

I’ll give that a try tomorrow thank you guys. Do I have to take the whole engine apart for that? I’m willing to cause I want to learn more about it but like I said this is really the first engine I’ve attempted to work on.

Yea the smaller drive chain moves when pushed and also when in choke. I actually replaced the new carburetor with the old one and changed the oil just before posting this to see if that was the problem. Clean fuel was coming out when I changed the carb.

No they are both on, it will idle in choke just fine, but then when I flip the toggle to run it makes a grinding like sound. Im assuming its something internal, but I don’t have a ton of knowledge on engines as this is the first one I’ve ever really worked on

RT200* if that matters

I bought a Coleman BT200 over the summer and have been loving it. Have replaced the chain and carburetor and oil after riding for awhile. Just recently I was riding around town and it felt like the engine seized and stopped running. It will run in choke, but when I switch it to fully run the...