here it is

[capt-stuck]

remember when i told you my motor putted out? well i finally got 10 min so i went out and took some pics for you to see, and maybe we can all put our heads together and figure out what went wrong. my boat

 

[rodbolt]

Re: here it is

wont let me in without your password

 

[capt-stuck]

Re: here it is

o.k i fixed it. try it now

 

[rodbolt]

Re: here it is

judging from the darkened paint and the topplug photo you really need to test tyhe compression before going any futher.<br /> do you know how to run a compression test ?

 

[capt-stuck]

Re: here it is

not really. Don't i hook the gauge up tp the spark plug hole and crank the motor?<br /><br />Before this it did have good compression. it was 125,120,125 top to bottom.

 

[DJ]

Re: here it is

Yes, that's about it. Just make sure the throttle plates are open. Wide open throttle.

 

[rodbolt]

Re: here it is

hello<br /> well ya only have to over heat it once, sometimes there is no second chance. the throttle bores on a two stroke dont have to be wide open however I would prefer they were. screw in your tester,available at wally world for 20 bucks or so, and have some one crank the engine over while watching the gauge. note how fast it climbs and the pressure it goes to. should be about equal on all 3. the max pressure should be within 10 pounds. ground all the spark plug leads or pull the kill lanyard before testing. dont want pesky sparks flying everywhere. a story behind that one day .<br /> do this for all three cyl with all plugs out.

 

[capt-stuck]

Re: here it is

O.k the comrpession are as follows; 110 on top, 35 middle, 95 bottom. so blown head maybe?

 

[novicetech]

Re: here it is

Maybe, you need to remove the head next, if gasket is blown you will be able to tell. You also need to check the impeller and t stat to make sure you have plenty of water flow. when you remove the head you will also be able to see any damage to the clyinder walls. You should be able to turn flywheel rather easy by hand with head removed. Be carefull when removing the head bolts,maybe loosen a quarter turn, then tighten an eigtht of turn until, this will free up any corrosion that may be on the bolt threads.

 

[eurolarva]

Re: here it is

Can you post your model number. Looks like early 70s model. As mentioned before those bolts could be corroded and easy to break. Go to walmart and get some pb blaster and soak the screws as best you can. If you break one they are a bear to get out. Also a heat gun for removing paint might help getting them out. You will also need a good service manual. Hopefully it is just the head gasket. If the pistons are shot you may want to consider parting it out.

 

[capt-stuck]

Re: here it is

Euro the motor is supposed to be a 1985. i never checked the numbers or anything yet, if i can even find them. I hope that this motor can be fixed, because new motors are expensive, and if i have to buy a new motor I should just get a new boat. That is not an option for me right now.

 

[capt-stuck]

Re: here it is

Here are some more pics i just took of the head and pistons. head and piston

 

[novicetech]

Re: here it is

How did the head gasket look?

 

[rodbolt]

Re: here it is

hello<br /> its hard for me to see the cylinder walls but the piston crowns appear intact. oil the walls looks like a touch of rust is forming.<br /> if the walls are not scared have the head surfaced and replace the gasket. the best surfacing machine is a 6 or 8" belt sander. you can use sandpper and 120 grit on plate glass but its a several hour ordeal.the head is warped. no need to check it just have it flattened, in my area the guy charges 15 dollars to do it unless its so warped he has to mill it. use perfect seal on the new head gasket. now ya have to find the cause of the overheat. its either t-stat water pump or pressure control valve. replace/repair all three.

 

[rodbolt]

Re: here it is

anothe ps<br /> check your warning horn.

 

[capt-stuck]

Re: here it is

How do you know the head is warped? what profession is the person who does the shave down? and i do not think the boat has a warning buzzer. the wiring was so f----d up on it when i got it. so if there was one there i didn't see or hear it. The gasket looked brand new like, but the t-stat from what i saw through the head did look coroded. The screws for the t-stat housing are froze. i heated it a little, but still nothing. i dont want to break the screws, or the housing, so i sprayed it with wd40, and hope it works.

 

[capt-stuck]

Re: here it is

what kind of oil should i use?

 

[rodbolt]

Re: here it is

oil most likely wont help. heat is the key. <br /> how do I know the head is warped? cause ya overheated the **** out of it and 30 years of wrenching on them. thats mostly how .<br /> any way you have to make sure the head has less than .002" warpage fom end to end. chysler/force liked to pop head gaskets anyway. do you have a little black thing on the top of the block or in the head that has an orange wire to it? if so that is the heat switch. test it while its out. your going to have to have a service manual. not much other way around it. it will say use silly cone sealent. DONT. use perfect seal. the blackened paint on the head indicates it was hot. heat will warp the head and allow water in the cyl and gas out,hence a loss of compression.<br /> a blown head gasket is a result of a cooling system failure, ya have to correct the cooling system or it will do it again,if the cylinders are not damaged this time they may be next time. use a hand impact and oxy/acetylene on the t-stat screws. propane usually is not hot enough. if they braek its not hard to drill them and rethread the hole. not for me anyay I do 4 or 5 a week.

 

[capt-stuck]

Re: here it is

Hello, <br /> Rodbolt where is the pressure control valve. I cant find it in th manual

 

[bioman]

Re: here it is

Hey Roadbolt, when a headgasket goes (on an 86 Force 50 HP), is there still enough compression to run (compression 125?). My engine runs (poorly), compression is 140 top/125 bottom, with mysterious oily guck accumulating in the back bottom of the engine cover....I REALLY don't want to do a rebuild yet...does this sound like blown Head gasket?<br /><br />Thanks!