See full version: Outboard bogging down under load
Classic symptom of clogged carb(s). It's customary to do a compression test and spark test first. Since you'll do both carbs (assuming compression and spark check out), the cylinder drop test is moot, but the fuel tank inspection is always a good idea.
Fred I had the same problem under load ,ran fine in driveway , on river it bogged down and no power . i think ur right the carbs need to be torn apart and soaked overnight, then blown thru all the passages to make sure there clear . I ve read b4 not to use air, I use carb cleaner or wd40 and make sure there clear , where it goes in , it has to come out , payin special attn to all the small passages. hope this helps , good luck
Re: Outboard bogging down under load
The 175 ProXS is based on the massive 3.4 V6, and will weigh over 500 Lbs at the end of the day, which defeats the purpose of a mid range outboard. here
1) Yamaha 175 Vmax SHO, 4 cylinder four stroke [links]
For overall value, power, and features, the Mercury 150 ProXS is hard to beat. with it’s affordable price, stiffer motor mounts, and low water pickup, you get a pretty good engine right out of the box. It’s biggest downfall is the gearing. The 2.08:1 gears are just a bit low for this HP range. And, the mounts could be stiffer still, it has quite a bit of sloppiness. But, at 163 HP on the dyno, and the ability to rev up to 6,000 RPM, this stout 150 is really nice.
Surprise, it’ s a Honda. If you like dark blue, and saving money, this is your engine, the Tohatsu 150. [links]
From a visual standpoint, you can barely tell the difference from the big block 3.4L Evinrude G2 from the smaller 2.7L version, they are very close in dimensions, it’s massive. This is an advantage the 4 cylinder engines have. Secondly, the Evinrude G2 2.7L has the worst gearing of the bunch at 2.17:1. That is truly gearing for pontoon boats or light duty tug boats. This is the same SLX gearcase found on the 3.4L with 1.86:1 gears, so theoretically you could swap it out, but that would be costly. here
3-Stage Carburetion For Better Fuel Economy
Conventional 2-circuit carburetors go directly from a lean mixture at idle to a rich setting at full throttle. The BF15 adds a third stage for better economy and smoother operation. more
Large Displacement For Better Performance
At 21.4 cubic inches, the BF15 has one of the largest displacements in its class. Along with the long-stroke design, this provides optimum torque throughout the RPM range.
Integrated Carrying Handle For Easier Transport
An integrated carrying handle makes transporting the engine a breeze. The convenient, foldaway carry handle is situated at the exact top/bottom balance point of the engine. This means the engine carries more easily in a level position. [links]
Drive
Gear Ratio: 2.08:1
Gear Shift: F-N-R
Thanks for the replies. I figured it was not worth the effort. I am also concerned on a new (used) outboard. I know my motor and I know it is good. Good compression, always starts right up, good conditional overall, no work required. A new (used) motor could very well be a lesser quality outboard than what I have. I am thinking maybe a prop change might be a better solution. [links]
Pick the prop which gives max rpm factory listed for that engine, will have best top speed, but will lose best hole shot. can't have both on a single prop. Or have 2 props for different boating applications.
Re: How much power difference between 115 HP and 130 HP
Re: How much power difference between 115 HP and 130 HP more
Re: How much power difference between 115 HP and 130 HP here
Your motor seams to do the job, but if you want to hook up your uncle than I'd drop a 130 on your boat. You will have more power and speed and the joy of helping a family member here