I know this is probably a commonly asked question, but I have been unable to find helpful posts.
I have a '79 Batavus that I recently ressurected. It starts fairly easily, and idles, but when I go to accelerate it is very slow. It dies with too much gas, and basically I end up having to pulse the gas to get it to go at all- too little gas and it will stall. After a lap around the block at about 5mph, it gets better, and better until it accelerates well. To get full acceleration though, I have to repeatedly drop down from full throttle and come back up, it sounds like I am shifting gears (bystanders might think I had a 10-speed or something).
I have air-blasted the carb, checked compression, good spark... would a clogged exhaust able to accelerate well after a lap around the block? I dont think my clutch is slipping because the RPMs correspond to the low speeds.
Any help would be great