Compression Question

[Boss Hawg]

I'm starting to get a 1987 70hsp Johnson going - I checked the compression & the top showed 130 - middle 145 & lower 135 - Is it worth fixing up?
It came on the 16' Starcraft pictured I want to fix up I bought for $1000- was told it had about 30hrs on a rebuild but you know how that goes
After some adjustments & a good de-carb it seems pretty good but i'm pretty new to this stuff-
Preciate any input

 

[tashasdaddy]

Re: Compression Question

well worth fixing up. delivers the most hp for the weight of any motor.

 

[Boss Hawg]

Re: Compression Question

well worth fixing up. delivers the most hp for the weight of any motor.

Thanks!! Makes me feel better

 

[HybridMX6]

Re: Compression Question

Doesn't sound too bad to me. You are right on the 10% within each other, but a good decarb may well fix that.

 

[Boss Hawg]

Re: Compression Question

Doesn't sound too bad to me. You are right on the 10% within each other, but a good decarb may well fix that.

Thanks- just came in from doing one but its dark & will wait till tomorrow to check compressin again :redface:

 

[jonesg]

Re: Compression Question

Wow great deal for the boat.

I had the same problem, did a decarb and kept startron in the fuel, it got better as I used it last year.

 

[Boss Hawg]

Re: Compression Question

Wow great deal for the boat.

I had the same problem, did a decarb and kept startron in the fuel, it got better as I used it last year.

Another thanks! I've got about 20ozs of Seafoam in about 3/4 of a tank & plan a good running tommorrow

 

[etex driller]

Re: Compression Question

That boat looks familiar what part of east texas are you from boss that's a great lil motor though.

 

[Boss Hawg]

Re: Compression Question

That boat looks familiar what part of east texas are you from boss that's a great lil motor though.

Howdy then
I'm just north of Lufkin
Bought it 2 weeks ago from a guy in Grapeland.

 

[Robj]

Re: Compression Question

You should be thrown in jail!! You stole that thing. Not sure how much those are worth over there, but here they are worth a fair bit more. As far as the compression, personally I would not open up a motor based on those compression numbers. Just do a de-carb and keep you eye on it. Hopefully the numbers will get better.

Have a great day

Rob.