Help is anyone local motor has pushed my buttons for the last time

[firstboat25]

Hey guys <br /> Not sure if we are allowed to post this but I figured I would give it a shot <br /> I live in ny and im at wits end with my motor<br />I have tried everything it is a 75 115hp. It runs like crap backfires misses wont idle nothing <br />There isnt a boat mechanic locally so I figured I would try this <br /> So far the carbs have been rebuilt, new power pack, coils, plugs, fuel hose<br /> Not matter what I do get same result and it has pushed my buttons for the last time <br /> If you are in the area and intrested please let me know <br /> Thank You again for all the help

 

[Solittle]

Re: Help is anyone local motor has pushed my buttons for the last time

Hope you find your guy dave. Next time you might try to troubleshoot it first.

 

[Dhadley]

Re: Help is anyone local motor has pushed my buttons for the last time

If its backfiring out the exhaust and the flywheel key is not sheared, there are probably 2 primary or plug wires crossed. Everything is labled. Follow the wires closely. From the wires out of the stator and timer base to the coils to the plugs. Youll find it.<br /><br />The most common thing is the coil mounting. The two port coils will be mounted what looks to be upside down from the starboard coils (or vise versa -- however you want to look at it). That is the way its supposed to be. On one side the plug wires come from the bottom of the coil and on the other side the plug wire come from the top of the coil. If they are mounted so the wire comes from the bottom (or top) on all 4 then I'd bet thats the problem.<br /><br />Follow the wires very carefully to make sure nothing is crossed. Its very easy to cross them.

 

[MCM]

Re: Help is anyone local motor has pushed my buttons for the last time

Hi Dave,<br /><br />Read this old post, its looong but it covers alot of ground & topics<br /><br />You kinda need to read & pay attention to the whole thing but I think you'll probably find something in there that will help.<br /><br />Gave it to another member & next thing ya know his motor acting like it should.<br /><br />Check it out<br /><br /> http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=28;t=030676#000025 <br /><br />Good Luck,<br />Mike

 

[firstboat25]

Re: Help is anyone local motor has pushed my buttons for the last time

Hey Guys<br /><br /> Thank you very much for the replies I will give it one more shot. I dont think anything is crossed but I will double check with out a doubt.<br /> All these parts were replaced due to the fact of the missing and stalling. Found weak spark out of coils changed them, found then losing spark changed power pack, now have great spark and same problem thats why I have had it <br /> Thanks guys

 

[firstboat25]

Re: Help is anyone local motor has pushed my buttons for the last time

Also when she misses lets out puffs of smoke

 

[Harker]

Re: Help is anyone local motor has pushed my buttons for the last time

What is your compression numbers? What do the plugs look like?

 

[Dhadley]

Re: Help is anyone local motor has pushed my buttons for the last time

When it misses or when it backfires out the exhaust?

 

[firstboat25]

Re: Help is anyone local motor has pushed my buttons for the last time

Yes <br />When it misses or backfires it comes out the exhaust

 

[Dhadley]

Re: Help is anyone local motor has pushed my buttons for the last time

I'd bet somethings crossed. Do you still have the cover for the pack with the schematic / lable on it?

 

[firstboat25]

Re: Help is anyone local motor has pushed my buttons for the last time

yes I do <br />When I connected the new one I took one wire off at a time <br />But this problem was there even before that was changed <br />Im so lost

 

[dajohnson53]

Re: Help is anyone local motor has pushed my buttons for the last time

Are you sure the flywheel key isn't sheared?

 

[firstboat25]

Re: Help is anyone local motor has pushed my buttons for the last time

how would I check the flywheel key ?

 

[firstboat25]

Re: Help is anyone local motor has pushed my buttons for the last time

also what does that control

 

[djzyla1980]

Re: Help is anyone local motor has pushed my buttons for the last time

You have to pull the flywheel off using steering wheel puller or like tool, when tightening make sure to tighten them to specs.<br /><br />Theres a key that keeps the flywheel from moving, it's purpose is to keep the timming on the motor right. A sheard timming key would cause your timming to be way off... Causing your plugs to fire with valves open. <br /><br />It's easy to check...and easy to replace.. but make sure the nut is tight..I think 105 lbs. Failure to do this step will cause future sheared key...EVEN in the Idle position.

 

[Goodoleboy]

Re: Help is anyone local motor has pushed my buttons for the last time

Dave...I think you made a typo. Two strokes dont have valves. Four strokes have valves...but I bet you knew that tho.<br /><br />White puffs of smoke may indicate water leaking into cylinder. <br /><br />Head gasket or exaust cover gasket.<br /><br />Sheard fly wheel key is highly probable, for back fireing.<br /><br />Good luck.

 

[firstboat25]

Re: Help is anyone local motor has pushed my buttons for the last time

When I raise the idle up threw the cable adjustment miss seems to go away or atleast be less noticable<br />What could that mean ?

 

[jfm1]

Re: Help is anyone local motor has pushed my buttons for the last time

did you do a compression test? if so what are the numbers?

 

[firstboat25]

Re: Help is anyone local motor has pushed my buttons for the last time

I have not done a compression test <br />I have to get ahold of a compression tester hopefully tomorrow I will get one<br />Also guys when I put a load on her she stalls <br />If I give a shot of gas into carbs she will take off I open the butterflies by hand <br />Any ideas ?

 

[djzyla1980]

Re: Help is anyone local motor has pushed my buttons for the last time

Yep Goodoleboy...knew that... and after the recent reed purchase... you'd thunk I'd remember to type it right. The prob is... I've been workin latley on my 75 chevy truck.... you knew what I meant right? Oh well <br /><br />Did we check the flywheel key???<br />As Jim states run the comp test