Whaler Central - Boston Whaler Boat Information and Photos

Posted by alienhelper on 12/16/09 - 4:52 PM

i have a 1998 conquest 21 with a 200hp yamaha series II and 92 gal gas tank does anyone know the best average mpg and crusing range for a setup like this or comparable setup? i cannot find any performance charts for this combination for comparison to my situation. thanks.

Posted by Conquest21 on 12/29/09 - 9:42 AM

Finally someone /w the same boat! I have the same whaler /w a '98 Johnson 225 Ocean Runner 2 stroke. It's a gas and oil hog. I haven't performed any actual test but I think I get around 8 gph cruising. I haven't taken it on any long trips yet to determine the range. I'd love to know that myself. It seems like I'm always filling it at the fuel dock. One problem I have is I'm not sure how much fuel the main tank vs. the reserve holds (I think it's about 40 gals. in the reserve) and I never use the reserve (so I know it's full). I think these Conquests are pretty heavy and burn more fuel than many other Whaler models, but the advantage is the drier and more stable ride than many other models. At least that's what my other whaler owner friends have told me. Anyway--I'm interested in knowing how you like your boat and what sort of performance you're getting. The top speed is pretty low too, only around 30 knots. But I love this boat.

Posted by kamie on 12/29/09 - 1:08 PM

You will get best performance from engines mounted at the correct height with the correct props. Have either of you tested your boats to ensure that the engines reach the recommended RPM's at WOT?

if you have the engines setup correctly, you will get the best speed, best MPG for your boat and the way you drive.

Posted by Mambo Minnow on 12/30/09 - 7:29 AM

I have a 1999 Conquest 21, but I have an OptiMax 200 HP Direct Fuel Injection 2 stroke. The motor was an important option to me when shopping for this particular model, which I love for my family (swim step transom, high gunnels). It makes a big difference in fuel economy, but it's still a very noisy engine compared to the E-tec or four stroke. I'd eventually like to repower with a Verado for the noise reason. The Ventura 210 still available new is normally outfitted with a Verado 225 HP now. I'd repower to this engine when you can afford to replace the conventional two stroke.

I don't have a fuel flow scan meter, but I do get good performance (top speed 38 mph) at 5500 rpms. I find you really need the trim tabs for hole shot and once at WOT you really need to tilt the engine up to get max speed. Play with your tilt/trim once on plane and place it just under cavitating out of the water for optimum speed.

Posted by DWinter on 01/04/10 - 4:02 AM

Mambo makes a greateat point. Many boaters don't know how or just fail to do it, but trimming out all boats especially the Conquest is essential. They are more bow heavy and you need to get her up and out of the water. Less hull in the water equals less drag equals higher speed, rpms and better fuel economy. You will not get your engine in the recommended WOT rpm range without trimming plus you really put unnecessary loads on the engine. You'd be surprised how many boats i've delivered to experienced boaters who are clueless to properly using/adjusting drive trim.