Need Help With Force Motor

maxum_man

Petty Officer 2nd Class
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May 2, 2010
Messages
167
Re: Need Help With Force Motor

If you torqued the nut down to 90 lb. ft. then I would say that flywheel is pulled down all the way. Mine is the same way. Was your old one flush with the top?
 

pnwboat

Rear Admiral
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Oct 8, 2007
Messages
4,251
Re: Need Help With Force Motor

You should be fine. If you can see the key in place then you're good to go. To double check, rotate the flywheel clockwise (looking down), and check for any wobble by looking at the edge of the flywheel (ring gear). If none, you're OK. If the key is out of place and flywheel not properly seated, it will wobble.
 

brianvolt7

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Jun 7, 2008
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423
Re: Need Help With Force Motor

Great, there is no wobble and I deffinetly see the key with a flash light. Tomorrow morning I will put the exhaust back on and set the motor.
 

brianvolt7

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Re: Need Help With Force Motor

I have been out of town all week but Monday. I did get the motor on and all electronics hooked up as well as carbs. Tomorrow (Saturday) is the big day. I am hoping I can share a success story.
 

brianvolt7

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Jun 7, 2008
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Re: Need Help With Force Motor

:D:D:D

I guess you guys know what that means!

Fired right up, first crank.

Only one odd thing, super high idle, I dont have a tach but I am thinking around 3000, like I am on plane. I have turned the idle screws all the way in and still super high idle. Any ideas?
 

brianvolt7

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Re: Need Help With Force Motor

Got the idle down but after running for a few minutes and shutting off, smoke slowly rolled out of the bottom carb and out of the two holes on the upper part of the leg where the rubber boot connects to the lower area of the motor. I have never seen this before, is this normal?
 

PaulO

Petty Officer 1st Class
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Jan 25, 2010
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225
Re: Need Help With Force Motor

Are you referring to part 30 here

I had gases entering past this rubber seal so I removed the back cover and sealed all around it. I haven't had it in the water yet to see if it has been successful but I believe it will be.
 

brianvolt7

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Jun 7, 2008
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423
Re: Need Help With Force Motor

Nope that?s not it. Anyway I figured it out, it is smoke from overheat.

I spun the cup inside to the waterpump housing. I have replaced the cup with an old one and remounted a good impeller. She is pumping great now, even out of the hole in the top when I removed the plug behind the thermostat.

My last problem now is the overheat buzzer is ringing. I have confirmed water spraying out of the exhaust snout, at the thermostat, and I even checked the stat in boiling water and it opened fine, long before boiling. I have a spare overheat thermostat that I can try. I don?t want to take to the water if it keeps buzzing.

Any ideas on the overheat with full water pulling out of the exhaust snout and apparently full circulation?
 

PaulO

Petty Officer 1st Class
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Jan 25, 2010
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225
Re: Need Help With Force Motor

Take the thermostat out and run it. Does the horn sound?
Maybe the horn has a spurious cyl head thermo switch.

Is the horn sounding when in the water or on muffs?
Water flow from pee hole is far greater in water than when on muffs. I was surprised.
 

brianvolt7

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Jun 7, 2008
Messages
423
Re: Need Help With Force Motor

I will try removing the t stat in a couple of hours when it is light out. I do have one of those cylinder head thermostats that activates the horn and I have replaced this with a spare from my first motor. same result.

It is only on muffs right now, but I have never had this problem before:confused:.
 

brianvolt7

Chief Petty Officer
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Jun 7, 2008
Messages
423
Re: Need Help With Force Motor

Just a few other things-

I want to check the timing. I have done this on a motor about 20 years ago and all I remember is hooking it to the number one plug line and battery. also I used white fingernail polish on the mark.

Can you explain the exact proceedure? I have a timing light and have reviewed the post's in this thread from around mid May, but can't find the info to actually perform the test.

Also what should it be set at? I believe the new block is a 1989 125.

My other concern is that I have a lower end of an 85 HP a motor leg of a 120 horse and a powerhead of a 125 horse. I noticed that the water pump kits are different numbers in the sierra catalogue. Do you think they pump at different rates and this may be why it is overheating? right now I have the 120 waterpump housing and impeller in the motor.
 

nathanhooper

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Apr 21, 2010
Messages
176
Re: Need Help With Force Motor

What a great thread!! When I first started reading I skipped to the end first to see the latest update, then went back and read the rest. Hindsight is 20/20 and it was interesting the compression check did not come up till it did. But thats the nature of the beast when diagnosing.

The reason I post is because I was sold a lemon last year and after having several issues with it, I let it sit all year till I started working on it this spring. Long story short is that it was in need of a major rebuild. But I do not have the money, so I have been doing my best to make it work till I do. One thing is that I believe I had, at one time, the same kind of chip you did on your old block. I will try to post a picture later when I get them off my old computer, but it was repaired by someone, and I received the motor in the shape it is now.

While the chip repair does not look that great, it did not show any signs of leaking from that particular spot on the gasket. In other words, I believe the chip could be repaired, but that is my opinion.

Just thought I would share that with you, maybe you could hang on to the block if it is in good shape other than that and repair it when you get some time.

Two strokes are resilient creatures. Not too complex and not too picky to make them run decent. But to make them run tip top shape it does take some strict standards, but for them to run it is amazing what you can get away with over a 4 stroke.
 

brianvolt7

Chief Petty Officer
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Jun 7, 2008
Messages
423
Re: Need Help With Force Motor

nathanhooper,

Thanks- I agree it has been a great thread and I am glad that the guys I am working with have a lot of perseverance.

I wish I would have had the compression gauge earlier but it took me a couple of weeks to get one once it was brought up. I know now to check that right off the bat. For the most part everything in this thread has been a learning experience for me. Luckily, the motor that I purchased runs like a top and I haven?t adjusted anything as far as tuning. Once I figure out how to get her to cool down, I will be on the water.

One great thing is that I have thoroughly enjoyed doing this project, it?s been a blast!
 

brianvolt7

Chief Petty Officer
Joined
Jun 7, 2008
Messages
423
Re: Need Help With Force Motor

Take the thermostat out and run it. Does the horn sound?
Maybe the horn has a spurious cyl head thermo switch.

Is the horn sounding when in the water or on muffs?
Water flow from pee hole is far greater in water than when on muffs. I was surprised.

OK- I took the t stat out and it ran about 10 minutes no problem. I turned it off for a minute to adjust the idle down and started it back up, within 1 minute the sounder went on. Should I wait until I have it in the water to make the final assessment, or would a garbage can simulate the lake?
 

PaulO

Petty Officer 1st Class
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Jan 25, 2010
Messages
225
Re: Need Help With Force Motor

Check out my engine and flow. It was suggested on this forum to tape around the muffs/intake to get maximum water through the pump and head. It worked

The flow in this video is laughable compared to when you get it in the water and see the result- even at idle. Power of water.

Try without the thermostat and if that works ok try it with the thermostat in.

Franc Acampora also confirmed the video looked about right regards water flow and ear muffs hookup.
 

brianvolt7

Chief Petty Officer
Joined
Jun 7, 2008
Messages
423
Re: Need Help With Force Motor

That's quite a bit more water than I have from my motor. I am taking it camping on Tuesday :D and I will find out then if it continues to overheat, but watching the video I think I will be fine. I am installing a new fish finder tomorrow and just got a GPS that has lake maps so I should be set.

The whole fam is fired up about the trip with the boat, even my 5 year old daughter helped me pump up the tube today. I am more into fishing though.
 

PaulO

Petty Officer 1st Class
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Jan 25, 2010
Messages
225
Re: Need Help With Force Motor

You should be able to hold your hand on the cylinder head cover for 4 to 5 seconds.

The water from the pee hole squirts almost horizontally when in the river compared to that little dribble.

If you have good flow then just keep your eye on it all the time and there shouldn't be a problem.

When you put the power head on did you put RTV sealant around the water pipe to power head joint?
Is the lower end of the pipe sitting snuggly in the water pump housing?
 

pnwboat

Rear Admiral
Joined
Oct 8, 2007
Messages
4,251
Re: Need Help With Force Motor

Great job! The overheat issue that you have right now is small potatoes compared to what you've just gone through. Let us know what the outcome is. Good luck! I would suggest that you get the timing verified ASAP. You wouldn't want to ruin all your efforts due to timing not set correctly.
 

brianvolt7

Chief Petty Officer
Joined
Jun 7, 2008
Messages
423
Re: Need Help With Force Motor

I did use RTV sealant on the motor when I reinstalled, kind of a messy job too because at first I forgot the four bolts that attach the exhaust plate. I had to pull off the motor and attach the plate to it then lowre it back into place.

Can you give me an idea on how to use my timing light and what reading I am looking for?
 
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