mercury 150

This topic has 9 replies, 6 voices, and was last updated 17 years, 10 months ago by oldtimer57.

Viewing 10 posts - 1 through 10 (of 10 total)

Author

Posts
July 25, 2008 at 1:35 am #341401

Stepper
Participant

My friend just bought an older, I think about an 1988 boat with a Mercury 150. Whats the compression supposed to be on this motor.

July 25, 2008 at 5:26 am #341421

Bass Cat Boats
Keymaster

Good question. My first guess is somewhere between 125psi to 145psi if you are using a compression tester. But the best test is to just test all cylinders and if they are within 10% of each other, the motor is probably in good shape… If it is an XR4 those were pretty good motors.2008 Pantera Classic2014 Mercury Pro XS 200

July 25, 2008 at 2:04 pm #341440

Bass Cat Boats
Keymaster

We dont remember the specs, though here is a site that a few good Merc Techs can help you on. A 1988 could be an XR-4, or a standard 2.5 block. http://bbcboards.zeroforum.com/zeroforum?id=53 BCB

July 25, 2008 at 4:39 pm #341456

oldtimer57
Participant

Actually I think it is a 2.4 block. But the XR4 motors really seemed to run well, and had a bit more “snarl” (exhaust note) to them than the XR6 (2.5 block) motors although the XR6 would probably run a tad faster.2008 Pantera Classic2014 Mercury Pro XS 200

July 25, 2008 at 7:30 pm #341469

Shap from La
Participant

That old XR4 was pretty quick for its time. We had a mariner MagII on a Venture 17-v and it would flat out boogie. That was the boat I cut my teeth on driving a Pad Bottom. I think it was more like 1986 though when we had that one. It was a 70 mph boat which was very fast then, especially for a 150. Enough about the past. Point is as Oldtimer said, this was a very good motor at the time. 20 Years is a long life for an outboard, so make sure it is checked out good. On top of the compression check , Perform a leak down test as well!! Chris Coupel Paulina, La.Chris CoupelPaulina, La.

July 25, 2008 at 8:50 pm #341488

Stepper
Participant

thanks for all the infor, it is indeed an xr-4 on a 17 1/2 procraft. I told him if it run that it should be a quick boat. I appreciate all the responses. happy trails

July 25, 2008 at 9:02 pm #341507

john1112
Participant

Make sure he checks under the deck. I had a 94 procraft and the stringers were rotted. Once the boats skeleton is shot, you might as well take it to the lake and sink it. And it certianly wouldnt be a good idea flying around at any speed.Last edited by john1112 on July 25th, 2008, 9:45 pm, edited 1 time in total.

July 25, 2008 at 9:30 pm #341531

oldtimer57
Participant

I believe the pros only came with 10 year warranties back then, and most still today although I think their top-line models might be limited lifetime. They definitely had a lot of wood in em, and the interior plywood in the rear was sealed with a chopper gun so a good inspection would be worthwhile. Even remove the floor drain and see what can be seen/felt under there as well as that is often a moisture wick on a boat with plywood floors. If you could find someone that knows what the weight of the hull ought to be, that would be another good test to see if it had put on a little weight (or a lot) which can only come from water soaking in where it doesnt belong.2008 Pantera Classic2014 Mercury Pro XS 200

July 26, 2008 at 2:06 am #341551

Hooter
Participant

I had a 1987 Procraft 1780, and the listed hull weight for the boat was 1200 pounds, as best as I recall.

July 26, 2008 at 5:00 am #341568

oldtimer57
Participant

Ive not done it, but it would probably be a good idea when you buy a new boat, to fill the tanks, and drive it to a scale and weight the entire rig, trailer and all, but no tackle or extra junk aboard. Then if something ever seems to slow it down, another trip to the scale can show whether it has gained any weight or not. Dry hull weight is not so useful unless you can remove the motor and lift the boat off the trailer to weigh it as they do at drag races…2008 Pantera Classic2014 Mercury Pro XS 200
Author

Posts

Viewing 10 posts - 1 through 10 (of 10 total)

You must be logged in to reply to this topic. Login Register