RE: Engine For Kwik FLi Mk. III
If you want the engine to look absolutely new, the Prestone green colored 100% solution antifreeze is your only choice. Sometimes you just have to bite the bullet and be done with it. Nothing comes in a spray can that will come close to cleaning as well as the antifreeze technique. No variations, by the way. Forget the environmentally friendly antifreeze and the red or any other color antifreeze. Prestone, 100%, green antifreeze only. Remember to keep the crock pot on LOW ONLY and to check your engine periodically to ensure that it isn't darkening. Darkening is likely to be caused if Low on your crockpot is too hot.
Ed Cregger