1990 force 90 also

[puzzled]

Motor ran fine yesterday. Today couldnt get it to go more than 5mphs with throttle all way open it would totally die, starts right back up but wouldnt go any faster. any help out there??? ASAP PLEASE!

 

[chads15]

Re: 1990 force 90 also

Check the spark plugs. they may be fouled. that would be aa start.<br /><br />Chad

 

[puzzled]

Re: 1990 force 90 also

thank you, will check that out today and get back to ya.this is new to me, so dont laugh, how many plugs should it have? And if this aint it,what else could it be?? embarrassing<br />watching a little fishing boat pass us as well as a boat towing another, they were all going faster than we could.haha

 

[puzzled]

Re: 1990 force 90 also

update: put new plugs in, ran little better<br />got up to 10mph still no power. Any suggestions anyone???

 

[kev_79]

Re: 1990 force 90 also

I was once the proud owner of a 90 model 90 horse force. HA I hated that **** thing, but I have known people with them that have had very little trouble. My advice, is not to push it. Don't run it again until you have checked the fuel filter, and dropped all of the bowls on the carbs to check for trash. Those carburators are a prehistoric model that look a lot like the one's on a lawnmower. The main jet is directly at the bottom pointing down. If it sucks up trash on one cylinder, it will run like a 25 hp. If you push it, you will lean out one of the cylinders and burn it up, and trust me on this one, I did it twice in my early days. If that is no fix, check timing, then compression, b/c you probably already dropped a cylinder. Good Luck

 

[puzzled]

Re: 1990 force 90 also

are cylinders expensive? How would we know if we dropped a cylinder?

 

[kev_79]

Re: 1990 force 90 also

take off head gasket to see if detonation has taken place, or you melted down a piston. You may be able to look with a flashlight into the spark plug hole, but this will be limited to what you can see. Hopefully, it isn't that bad yet, I would start with the carbs, then see what's up. A compression check will tell you if a cylinder is bad also, and wouldn't hurt to check timing. On that motor, there are two marks. The single mark is idle, and the three marks to the right of the one is wide open timing. Line the mark on the block with the middle mark. Also, make sure to check timing in gear. If you need more help, write back, and I will walk you through it.<br /><br />Good Luck

 

[puzzled]

Re: 1990 force 90 also

thank you, will give it a try and let you know.