Johnson 1983 115HP V-4

[rscott]

My motor wont perform to its fullest potential.In wot boat only goes 10mph.Compression at 125lbs/1,2,3 & 4.Good blue spark on all 4.Fuel mixture 50:1.Carburater and fuel pump cleaned.New gas tank,lines.When adjusting timing noticed no difference.........Anybody have any suggestions?

 

[USS Neversail]

Re: Johnson 1983 115HP V-4

Checked the reeds and fuel pump? Are the rpm's high with no speed or is she choking out?

 

[rscott]

Re: Johnson 1983 115HP V-4

Thanks USS, my motor runs great at idle,revs good but lacks topend.

 

[Dhadley]

Re: Johnson 1983 115HP V-4

Describe further what you mean by "adjusting timing". Whats the top rpm's?

 

[rscott]

Re: Johnson 1983 115HP V-4

With engine running on water.its impossible to adjust.turned off engine loosened nut and tried to adjust timing with light difference not found.I pulled flywheel,because the timer base didnt seem to be attached...

 

[Dhadley]

Re: Johnson 1983 115HP V-4

So youre saying the timer base doesnt move as you advance the throttle? What was the timing set at?

 

[rscott]

Re: Johnson 1983 115HP V-4

Its suppose to be at 28degrees.....<br />I feel my timing may not be advancing.It takes of fine but only travels about 10mph.It idles good,puffs every once and a while.but it revs strong....

 

[rscott]

Re: Johnson 1983 115HP V-4

Could this problem be my stator.

 

[rscott]

Re: Johnson 1983 115HP V-4

USS the rpms are high wirh no speed........

 

[DJ]

Re: Johnson 1983 115HP V-4

rscott,<br /><br />Is your prop hub spun?

 

[rscott]

Re: Johnson 1983 115HP V-4

Djohns in gear out of water i cant spin my prop.....is there another way to tell if its spun?

 

[DJ]

Re: Johnson 1983 115HP V-4

rscott,<br /><br />I am thinking that your engine winds up (rpm's) but just doesn't move the boat-right?<br /><br />If so, try this. Put a mark on the prop hub and a corresponding mark on the prop outer housing. Run the boat and see if the marks are still lined up.

 

[rscott]

Re: Johnson 1983 115HP V-4

Yes plenty of rpms,my propeller turns and makes boat move through the water but just not very fast.thanks djohn im a new otboard owner but love to fish/need to go down the lake...

 

[rscott]

Re: Johnson 1983 115HP V-4

djohn are my reed valves behind my carbs?

 

[Dhadley]

Re: Johnson 1983 115HP V-4

Does your timer base move when the throttle is advanced?<br /><br />When you had the timing light hooked up, what was the timing set at?<br /><br />What top rpms are you getting?

 

[rscott]

Re: Johnson 1983 115HP V-4

Dhadley the timer base is not moving enough because when i pulled the flywheel with timing adjusted all the way out it wasnt pointing toward the frt of the boat......it suposed to be at 28",but it never changed from being way out....At full throttle not in gear im getting around 4500 rpm.