How is your engine modified that your clutch can’t hold? A stock clutch should have no problem with a stock engine.

As far as I know there’s nothing aftermarket in the motor he just has miles on it and be honest with you I haven’t even knocked the clutch cover off of it like a bonehead, because I wanted to polish the aluminum out first because you know looks over functionality right? It has Valvoline for stroke 1040 in it as well. Also I don’t know what I did with the dang thumbnail for the program that compresses files so we can put them in here I think it started with a P kit

As mentioned, your stock clutch can handle the power of the stock engine without issue.  If yours is slipping - the clutch cable is too tight and needs adjusted, or somebody used the wrong oil in the engine and contaminated the clutch with "friction modifiers" that are in energy conserving oils....or there is something else wrong.  It takes a lot of miles to wear a clutch to the point is will slip from wear.

OK y’all I appreciate the info. Now I’m currently on the  side of a highway in St. Louis but all I do is talk about my motorcycle while I’m gone so by the time I get home I can pretty much make the old lady move out the way so I can start eliminating things on the motorcycle LOL and because I got the thing for 100 bucks, and now I have it running you already know what she says. You need to sell that so we can pay some stuff off I don’t think so Tim. sorry guys I’m just happy it’s Friday I’ve been on the road for three weeks anyway I adjusted the clutch per the clymer. Utilizing the 2 to 4 mm of FreePlay. But the two lines on the side of the clutch, cover the lever supposed to ride in between those or the bottom down to the bottom I really hear what y’all have to say that book. I don’t believe the belt is slipping, because what’s the adage? If you can turn it 90° in your hand without too much trouble it’s just right? I’ve done that. I’ve change the oil twice with Valvoline four stroke motor oil and filter. Previous to my possession new headset and dude‘s yard covered for probably 2 1/2 years you can literally see the rust line inside the tank where there was fuel when you parked it. Period. Would the exhaust valves opening feel like that though maybe the D cop is out of whack. Because all I did was burn up the controller from trying to start it too much, I bypass that it starts fine and runs fairly decent according to me but that doesn’t mean a whole lot because it’s foreign to me to have a Single cylinder under me, it really feels weird when you’re just loping along at the top of first gear or in the bottom a second just thump thump thump but when I roll the throttle and get into it from there it feels great but when I’m really trying to make about 70 or 75 miles an hour at the top of fifth and I’m hitting it something just isn’t there. I think it might be a fuel issue because I’m not sure about the intelligence of this guy got it from I smell a carb removal again when I get home. Also when I got your attention I would have to have the cylinder board out to put the Wiseco piston in correct I don’t know what the stock size is. Sorry guys I’m just spitball in here but I really like the bike it’s fun…Especially for 100 bucks LOL