1992 -115hp

[punchy]

This is my 1st post and it may be too long.I bought this rig (17' Nitro) new in July 1992.In March of 1993 oil injector stopped and the engine locked up.The dealer(Fin&Feather)replaced bad parts and bored the engine.That engine ran great until 1995 engine locked up and they replaced complete powerhead.My problem now is it takes a long time (if it ever does)to get on plane.When setting on trailer with water hose attached it will rev up plenty fast but in water when you hit the throttle it just bogs down.The boat has not been in the water much in the last 1 1/2 years.I thought the carbs may have alot of varnish so I bought two kits and tore down one carb.It was pretty clean no varnish but alot of oil in bowl about 1/8" deep I figured the gas had just evaporated over time.I am going to try to drain the fuel tank this weekend.<br />I was told by a service guy in 1995 that these engines (carbs) should be rejetted but it would void my warranty so I did not do it.<br />Do you think its a fuel problem causing it to bog down on take off.When it does get up on plane it runs good going down the lake.<br /><br />engine # RSM9033V<br />carb# 335829-CR<br />main jet #67-c<br />small jet #26

 

[fireman57]

Re: 1992 -115hp

Welcome to iboats. Sounds like you have had your share of bad luck but things are getting better. Should be no need to rejet these carbs. Tear them down and clean them thoroughly. You didn't say so but I am assuming that you are mixing your gas and oil. These engines don't run well on oil alone. Use the red search feature at the top for how to properly clean, rebuild, and set your carbs. You may have to do a link n sync also. Again with the search feature. Let us know what happens.

 

[rickdb1boat]

Re: 1992 -115hp

Hi Punchy<br /><br />I would remove and clean all the carbs, since the motor has not seen much use. Was this done during the last rebuild? Did they find the cause of the last failure? Buy new kits for all the carbs and rebuild and clean them thouroughly. You don't want a lean running cylinder to have a repeat performance....

 

[Dhadley]

Re: 1992 -115hp

After you get the carbs cleaned and new kits installed, check the timing. Or maybe you know now what the timing is set at? What spark plugs?

 

[punchy]

Re: 1992 -115hp

Thanks guys for fast replies.To answer your questions,<br />1. no I don't mix the oil,the oil injection is still on it.<br />2.I don't think they checked too much when they replaced the powerhead,they never said much about the cause.Carbs were just taken off the old powerehead and placed on the new one (no rebuild).<br />3. I am running NGK plug they have run the best in this engine for me.<br />4. I have new kits in both carbs and will drain old gas this weekend.<br /><br />Question,how do I check timing and what should it be.<br />What is the RED knob on top of the air intake?It will only turn about 1/4 turn.

 

[punchy]

Re: 1992 -115hp

Forgot one thing.The paper instruction with kits said to set floats parallel to carb body when inverted.These floats were about an 1/4" below that.Would this cause engine to maybe get to much gas?

 

[jrem]

Re: 1992 -115hp

Hey Punchy!<br />I'm not an expert, but I think we have pretty much the same setup. I have a 1992 Nitro FS180 (17') with the Johnson 115 that I bought used and have worked on various issues over the past couple years. One thing I've learned is small changes in the carbs make big differences in results. Case and point - I took it out one time, and it would idle perfectly fine and would run good up to about 7mph. Beyond 7mph, it would sneeze and stall. Cleaned the carbs and put new kits and floats in..Now it SCREAMS!!! I would definitely set both floats correctly. Then do a linc and sync.<br /><br /> <br />When I rebuilt the carbs, there were THREE pairs of jets. (idle, midrange, and highspeed) Perhaps your midrange jets are clogged? They're located in the float bowl, perpindicular to the high speed jets.<br /><br /><br />If you haven't already, get a tech manual. (Seloc,Clymer's, or OMC.) It's worth it's weight in gold, specially for a non-expert such as myself.

 

[Dhadley]

Re: 1992 -115hp

If you must run NGK's make sure you back off the timing and/or add fuel. They run a bit hot for that motor. If that's what you've been running it could have contributed to your piston damage. Probably more than you realize. If the dealer knew you were going to run them he may have backed off the timing to prevent another failure and therefore you'll have less power.<br /><br />If you're running old gas or something other than 87 octane that will add combustion heat too. <br /><br />That red knob is the manual release for the primer. It should be parallel to the body. If it's turned to the side it opens the primer and allows gas to freely flow into the intake.

 

[punchy]

Re: 1992 -115hp

JREM I ordered a Seloc manual today and all the jets were clear.<br /><br />Dhadley what plugs would be best?I was running Champions until spring of 2004.They seem to run better with NGK but I will take them out this week.

 

[rickdb1boat]

Re: 1992 -115hp

Ditto on changing to the Champion Plugs...QL77JC4 gapped at .040 (Better low speed operation than at .030)<br /><br />And yes, the float needs to be set parallel to the carb body(Bowl) or it will run rich...1/4" is quite a bit to be off...

 

[punchy]

Re: 1992 -115hp

I am a member of alot of forums mostly guns/hunting/fishing.This site beats them all on information, a great place.

 

[emdsapmgr]

Re: 1992 -115hp

Suggest you do a compression test, just to be sure the powerhead is still OK. Make sure your plugs are all out.

 

[Cricket Too]

Re: 1992 -115hp

If your gonna tear those carbs down, make sure you soak them good, even if they look clean, there's a lot you can't see in the spots that matter, just throwing kits in them won't help as much as soaking everything. Also make sure you do the link and synch, that may be the reason it's running the way it is right now. Has it run like this since you got the new powerhead from the dealer, or just since it's been layed up?

 

[punchy]

Re: 1992 -115hp

Originally posted by Cricket Too:<br /> If your gonna tear those carbs down, make sure you soak them good, even if they look clean, there's a lot you can't see in the spots that matter, just throwing kits in them won't help as much as soaking everything. Also make sure you do the link and synch, that may be the reason it's running the way it is right now. Has it run like this since you got the new powerhead from the dealer, or just since it's been layed up?

I soaked the carbs for about 20 minutes.It ran good after the new powerhead it just been getting worse the last 2-3 seasons.

 

[punchy]

Re: 1992 -115hp

I think I may of found one of my problems.I soaked the carbs(1 at a time)and put kits in both.Reset the floats they both were set way to deep.Put carbs on set the linkage between the carbs by the manual.I was checking the cam follower pickup as the manual said.The cam follower should be inline and touching the boss on linkage and carbs should be shut.This thing had a 1/8" gap between the boss and follower.The timing was advanced about 3/8" before the throttle started to open.This would cause alot of my problem I think.

 

[Walker]

Re: 1992 -115hp

Is the clear bushing still on the cam roller. It is common for it to crack and come off. A new one is very cheap.

 

[punchy]

Re: 1992 -115hp

Originally posted by Walker:<br /> Is the clear bushing still on the cam roller. It is common for it to crack and come off. A new one is very cheap.

I replaced it with a new one.The old one was cracked but still hanging on.

 

[punchy]

Re: 1992 -115hp

I think its time for a blasting cap or a match in the gas tank. <br />I finally got to the lake today to try it out.Nothing has changed still will not reach any rpm out of the hole.Bow comes up and never drops motor is trimmed all the way down.It never gets over a couple mph.BUT when I was loading back on trailer i missed it alittle so I put in reverse and it has plenty of go.In reverse it will rev up great!<br />I have soaked the carbs,new kits,set floats.<br />New plugs<br />set link/sync.<br />drained all gas from tank<br /><br />Any ideas,my little brain has about had it.

 

[punchy]

Re: 1992 -115hp

Can i check timing with the boat tied to trailer on a lake ramp with prop on? Manual say's I need a wheel instead of prop installed.<br />I can't find a fuel filter anywhere.Is there one in the VRO pump.

 

[punchy]

Re: 1992 -115hp

Rick or Dhadley what do you think?