Re: 4200 RPM Att. Paul Moir
Sorry I didn't respond. I haven't had a chance to do a definitive test but I kept expecting to do one imminently, so I kept holding off on my reply. I have a laser tachometer to confirm with but unfortunately, it hasn't all come together just yet. <br /><br />Ideally you want to be right around 4500RPM, so you're not that far off. But I think you should be able to swing the 12" prop no problem. What is your compression like? Also, since you don't have the adjustable high speed needle it might be worth checking to see if you're running a little rich or lean. Shut down the engine as quickly as possible after a couple minutes at WOT. Let it cool off and remove the spark plugs. Examine the firing ends to see if there's evidence of running a little rich or lean. Ideally the plug colour should be tan.<br /><br />You didn't happen to have a GPS with you did you? <br /><br />Also, feel free to jack up the engine on the transom quite a bit. Usually this will work pretty well with a BT. Keep an eye on water flow at start and in reverse while you do.<br /><br />You're not running up in the mountains I take it? Just about 2000 ft or so?
