If it seems to lose power on the top end, that a good indicator that the engine is running lean. If your oil/ fuel mixture ratio is off with too much oil, your “fuel” may not have enough gas to mix with oxygen to provide enough power. A good way to determine a lean burn is 1. Check the spark plug color. If it looks gray or chalky, you might be too lean and 2.when you run the engine at full throttle and back off the throttle a touch and the engine speeds up, it is too lean on the top end. Check for leaks around the carb and intake manifold. Spray a little starter fluid Near the manifold and if the eNgine speeds up, you have an air leak. Should you find the plug to be black and Sooty, you have the opposite problem, too rich. Again , check mixture ratio. Not enough oil in the premix can make a difference, causing incomplete combustion at full throttle. Finally, modern gasoline doesn’t mix well with oil and alcohol tends to separate the oil from the gasoline. That can mess with your fuel as well, making part of the fuel storage critical to a good running motor. Aren’t engines fun? Chuck Gilchrest Half Magic Padanaram MA Sent from my iPhone
> On Jun 7, 2020, at 9:29 AM, David Risch via CnC-List <cnc-list@cnc-list.com> > wrote: > > > So instead of giving it away I rebuilt the carb and half dozen other fixes > this winter. > > Runs and idles great, but at full throttle she bogs down continues to run, > but sounds rougher. When out gear it goes right to full throttle. > > Perhaps overpropped? > > Sent from my Android. Please forgive typos. Thank you. > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each and > every one is greatly appreciated. If you want to support the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray >
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
