1990 force 90 rebuild questions

[ERA]

im rebuilding my 1990 force 90 hp coz my third cylinder is reading 0 and the whole block already tear down . all three pistons is not good so im replacing them with another used pistons but thay r perfect with new rings .my first question is the first cylinder from the bottom needs to be bore has lil mark in it so i went to the machine shop today and thay said 300$ i was like what noway and im gonna need to buy 3 new pistons oversize .so i was thinking not bore or anything and just put the 3 used pistons prefect shape and new rings . im gonna have any problem if i do that ?

another Q . what is the height level for the carbs float ?

p.s if bore my block and pay that much money and new pistons i will end up payin like at least 600 and i saw new whole blocks on ebay for 700 $

can i bore ma self if yes then how ?

your help is highly appreciated

 

[pnwboat]

Re: 1990 force 90 rebuild questions

The problem with using your old block and used pistons is the piston to cylinder wall clearance. The tolerance for wear is just a few thousands of an inch. Maximum out of round tolerance is .0005". Maximum taper from top to bottom of the cylinder is .002". You need a machinist to measure the cylinders and pistons to see if they are out of tolerance. If you use parts that are out of tolerance, then you will end up with a poor running motor, or one that does not run for very long before it does more internal damage.

If you install the used pistons with good used rings in your block without measuring, them, then you may be wasting you time and money, or it might work out just fine. You never know. From what I've seen, it usually does not work out in the long run.

New forged Wiseco pistons usually run around $100 each. Most machine shops charge $30 - $40 to bore each cylinder.

Unless you have the special boring equipment, you cannot bore the cylinder(s) yourself.

 

[ERA]

Re: 1990 force 90 rebuild questions

Thats what i thought its gonna be 30 or 40$ per cylinder but Machine shop ask for 300$ to bore 3 cylinders .

 

[pnwboat]

Re: 1990 force 90 rebuild questions

I've never heard of a shop charging $100 to bore a cylinder. They must be really proud of their work! Maybe there is a misunderstanding?? I don't know.

I'd check with a couple of other shops. Preferably ones that do outboards. I find that a lot of machine shops that primarily do automotive machine work are reluctant to do outboard work. Maybe this is the case in your situation?

 

[ERA]

Re: 1990 force 90 rebuild questions

Thnx for ur response pnwboat . They could be reluctant to it . I'm not sure . But I will never pay 300 $ for bore three cylinder .
Wht about the carbs question ?

 

[jerryjerry05]

Re: 1990 force 90 rebuild questions

Where you located? Profile? Locaton?
The carb,upside down. The float should be level.
The drop,carb right side up.The float drop should be so that it doesn;t touch the main stem.
There was a guy on here that paid $200 to have his cylinder bored and the others honed. I paid $60 for the same thing.
The shop had a new machine and he was the first customer.
A GOOD shop will ahve the specs when boring and honing.
They should tell you if anything is out of spec and if you should bore the whole block or just 1 cylinder.
Like I said where you located?

 

[ERA]

Re: 1990 force 90 rebuild questions

hi jerry .im in Hermiston Oregon . and the machine shop that told me 300$ is AMS hermiston

 

[pnwboat]

Re: 1990 force 90 rebuild questions

Might want to check in Kennewick, Pasco or Richland area to see if there are any Machine shops that are more reasonable.

Just to clarify what Jerry said about the carburetor float. Here is a diagram of what the float should look like. Like Jerry mentioned, the carb is off the motor and turned upside down with the fuel bowl removed to check this setting.

 

[ERA]

Re: 1990 force 90 rebuild questions

thnx jerry and pnwboat. now i know how to do it but i was watching this video on youtube and the guy say the height suppose to be 13.32 . here is the video watch it and please tell me which way should i go with SETTING CARB.FLOAT ON A 2 STROKE - YouTube
ok so i give up boring my cylinders no body around here is doin it and if they does they asking for too much money 300$ i even heard 430 $ can u believe it ( . anyway i decide to go ahead and buy another used block out of ebay and i found one for 850 $ the seller say compression reads between 120 to 130 on all 3 cylinders i think thats good .what you guys think ?
so i bought this block and its on its way now now i have some questions again lol
flywheel do i have to put it back on in specific position ? sorry i know it could be dump question to some ppl but as i said earlier im still learning and this is ma first boat
do i need to adjust anything alse on carbs other then float level ?
i heard about fuel and water separator so can i put that on ma motor if yes then how and where can i buy it from
thants enough for now i will come back with more questions when my block arrive

thanks everybody

 

[ERA]

Re: 1990 force 90 rebuild questions

anybody will answer ma questions . where is the expert members . i got more questions but im still waiting for answers for the old ones

thnx

 

[healey8390]

Re: 1990 force 90 rebuild questions

When I rebuilt my 4 cyl Chrysler I got two pistons, one bore, three hones, rings for the two pistons. A gasket set and big end rod bearings for all four pistons for $400 bucks. That shop is rediculous. The guy that owns the shop worked for his dad and now runs it at hours good for him. I'm sure he's got money and sold me the parts at or just above cost so yes I got a deal but you're getting robbed.

 

[jerryjerry05]

Re: 1990 force 90 rebuild questions

ERA, if you don't get an answer within a few minutes,be patient.
We got lives,plus the wife gets upset if I don't give her my undivided attention
The carbs,the front air/fuel screw, needs to be set at 1 turn out for inital fire up.
The flywheel only goes on one way.Just make sure the key is in right.It also needs 95# of tourqe.
Some people take advantage of others. B%^&&&*.
You should do this as soon as you get the block.
Do another comp test. Then pull the head and check the cylinders.
120-130. It might show the cylinders are scored.
Comp should be even across all 3.
I had a 125 block for sale,comp 145 all 4.
I don't sell junk,I took the head off, just to be sure.
Found 1 scored piston.
I stopped the sale.

 

[ERA]

Re: 1990 force 90 rebuild questions

k jerry i will try to be patient lol .
i will adjust air /fuel screw .and i will do comp test for sure when i get the block .
what about this video SETTING CARB.FLOAT ON A 2 STROKE - YouTube .can i adjust ma float like that or no

thnx again jerry

 

[pnwboat]

Re: 1990 force 90 rebuild questions

The video shows pretty much how to do it, however, the newer manuals don't specify a measurement of 13/32. It just states that the float should be parallel to the casting.

 

[ERA]

Re: 1990 force 90 rebuild questions

thnks pnwboat . ma block will be here in da morning yeaaa so excited .
anyways now i have another question i think i made a big mistake when i was changing the oil for ma lower unit i did not see the plug in bottom of the lower unit so i drain and filled it up from GEAR SHIFT ARM PIVOT PIN # 43 it was pain in ***** to put this screw back in . so now what should i do im thinking to drain it again and use an air compressor and blow it out and then put the screw back what you guys think what should i do with dumb mistake please help

 

[jerryjerry05]

Re: 1990 force 90 rebuild questions

Don't take it out again. You need to try to shift it. Turn the prop shaft or drive shaft and shift through the gears.
If it works????Then you missed a big bullet.
If not then you need to take the gear housing cover off and reinstall it through there.
Once you do that and reinstall?? You need to pressure test the unit.

 

[ERA]

Re: 1990 force 90 rebuild questions

thnx jerry . i did what u said and its working just normal . so should i just leave it like that is it suppose to have gear oil in there anyway or not . could it cause any issue later on ?

 

[ERA]

Re: 1990 force 90 rebuild questions

ok i got my block today in the morning and i put everything together but i have some questions again lolz
1- i got new seal and retainer for the upper Drive shaft but im not sure which way they suppose to be .check pics

2-seal for the lower drive shaft check pics and let me know one is the right one

3- how to adjust the cam right i tried million times cant get the butterfly to open right it just open lil bit on wot


plz i need an answers ASAP so i can put everything together and go fishing
you guys help is highly appreciated
thnx in advance

 

[ERA]

Re: 1990 force 90 rebuild questions

4- new head cylinders has something like nozzle in the front i have no idea what to do with it or should i connect somthing to it please help ? check pic

5- where is the wire on the cylinders head goes to ? check pic

6-i bought new stand tube but im not sure if i installed them right or wrong ? check pic

my old cylinder head dose not have any nozzle


thats it for now

Again plz i need an answers ASAP so i can put everything together and go fishing
you guys help is highly appreciated
thnx in advance

 

[jerryjerry05]

Re: 1990 force 90 rebuild questions

#1
#2
#3 do the linc and sinc in the first post of the Force forum.
That fitting is a pisser tube.Hook a hose to it and drill the lower cowl.Not many had that built in.
That is the overheat sensor it goes to the Orange or tan/blue lead in the wiring harness.
Tubes are right.