is motor to high125 force

[19732009]

i have a 1988 baliner 18f 125 force and at 4100 RPM wot all i can get is 32 or 33 i think the moter is to high shud it go faster. i have sum pic to look at

 

[jerryjerry05]

Re: is motor to high125 force

Looks like you have a short shaft instead of a long shaft.It will need a longer motor or cutting down the transom.
Post some more pics of the bolt holes and transom where it goes thru.J

 

[19732009]

Re: is motor to high125 force

i put sun new pic up. is that why i can not get speeds over 32

 

[john from md]

Re: is motor to high125 force

The anti cavitation plate should be even with the keel of the boat. Your is a couple of inches too high. This will cause some loss of performance but not what you are seeing.

The high engine is not the cause of your speed being slow. Your engine rpm is way too low. You should be getting 5000 to 5500 at WOT. What size propeller do you have on the engine?

John

 

[19732009]

Re: is motor to high125 force

13x17 prop

 

[john from md]

Re: is motor to high125 force

If you are running a 13x17 prop and are only getting 4100 RPM, you have a dead cylinder.

You need to do a spark check on all four cylinders. If that checks out, do a compression test. Either you have one cylinder with no spark or a dead cylinder from low compression.

John

 

[19732009]

Re: is motor to high125 force

i did a compression test 3 of them at about 119 and one at 114 i have good spark at idol i rebuilt the fuel pump replaced all the gas lines cleaned carbs like 3 times and i had the boat about two years never ran over 4100rpms wot could i have a weak coil that is not puttin out enogh spark at high power

 

[roscoe]

Re: is motor to high125 force

You could have a coil going bad, but they usually work ok when just started, then would start to fail when they get hot.

I think you should run her, get her warmed up, then do a spark check.
It needs to be a bright blue spark and be able to jump a 7/16 to 1/2 inch gap.

 

[john from md]

Re: is motor to high125 force

Also, I would try a couple of good decarb treatments. Your engines compression should be in the 150 psi range. You are pretty low all around.

John

 

[19732009]

Re: is motor to high125 force

could the RPM be down just because i have low compression i now the book seas the it should be in the raing of 135 to 165 i do have a in line gas tank could it have a lot of moisture in tank.

 

[john from md]

Re: is motor to high125 force

What is mostry?

John

 

[shytownborn]

Re: is motor to high125 force

i believe its moisture

 

[john from md]

Re: is motor to high125 force

That was weird. This morning when I read the post, it said 'mostry', now it says moisture. Maybe my browser is shot.

No, moisture won't cause a constant rpm of 4100. It will cause the engine to miss and run erratically but you have not indicated that this is the case.

John