1987 Spree no low end power

[Dyingbreed]

I just purchased a 1987 spree. The machine has no low end pull and doesn't start pulling until about 15mph. I took the carb apart and clean it and made sure it had a #65 main jet. I replaced the plug as well. The stock air filter does have a hole in it so I've ordered a new one. Any advice and guidance would be greatly appreciated.

[Meatball]

Clutch or belt slipping? Does it seem like RPM’s are revving but just no “go”?

[Dyingbreed]

Revs fine on the kickstand but doesn't rev under a load. Very slow take off but starts pulling from 15 up to 25mph where it tops out

[Meatball]

Definately pull the belt cover, front pulley and clutch assembly off and inspect. If the belt is slipping, the V section will be shiny and glazed. If the clutch is slipping, the bell will have a blueish/rainbow color to it indicating excessive heat from slippage. The clutch pads themselves and the inner bell surface can be smooth/glazed from slip/heat as well. Inspect and return with findings...pics help.

When the issue only shows up during take-offs, it leads one to think its belt/clutch related. The grip of the belt/clutch is under maximum stress from 0-15mph. If something is going to slip...it will do so then.

[Meatball]

Compression test is next

[Dyingbreed]

Thanks I'm doing a compression test next weekend as I'm borrowing a buddies tester. This week I'll pull the clutch apart and inspect it. Thanks for the help