problems with yet another 89

Ga_goat

Have an 89 that I did a top end on 2 years ago and it had been doing well until about a month ago , it first started by not wanting to crank when it was hot ( after continual running for more that 20 min or more ) then 2 weeks ago my grandaughter was riding it and it just stopped, and hasn't cranked sence then , what I've done so far is, 1 - pulled the carb took it apart and cleaned it with a bath soak in liquid carb cleaner , washed it off blew it out with air and put it back together and back on , checjing all vents and holes with a torch tip cleaner .2- it has a very good blue spark at the plug .fuel pump is pumping at near full line volume ,3- pulled the reed valve took it apart cleaned it seemed to be in good shape (except dirty) ,4- removed the air cleaner and cleaned it well ,, I can get it to fire after putting fuel directly into plug hole . I'm at a loss .
seems to have good compression ( have no way to test ) and fuel pump is pumping but no gas seems to be getting to plug .

BGW

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royaldude

Hi i think if the fuel pump is pumping but no fuel is getting to the carb, it has to be a stoppage in the fuel line. Why not try to disconect the fuel line at the top end and get it to pump and see if you are getting fuel coming out at the top end? If the pump is pumping and you get no fuel coming out at the pump, try the fuel filter. Those lines should not be too expensive.

Dave Box

To clarify, you say that the engine will not crank, that means that the engine does not turn over when you try to start it. Then you say that you have a spark which can only happen if the engine is cranking. I assume that you mean that the engine does not fire although it does turn over when you try to start it. If this is the case and you did a great job cleaning the carburetor, including the needle valve that is controlled by the float try this.
Remove the rubber hose to the air intake of the caburetor and squirt some two stroke mixture into the air intake. If the engine fires, however breifly then you still have carburation issues. If it still does not fire then it is probable that you have popped a crankshaft seal.
Let us know what happens.
Dave

Dave Box

Actually I just reread your post and you say that you took it apart and soaked it. Did you take the main nozzle and jet and the slow running jet out to clean them? If not then you did not clean your carburetor and we should address that first.
Dave

Ga_goat

had every part off of the carb that has threads in the basket soaked for 15 min as per dirctions washed all parts with water then checked all openings with a welding torch tip cleanes and blew it dry wirh air . all fuel lines are new and clear plastic ,
didn't mean to say engine wouldn't crank it turns over fine has good blue spark just won't start ,, I found another carb locally that i'm going to try this weekend ,, If the shaft seals are gone would the vaccum fuel pump still work ?

Dave Box

The fuel pump will work but at a reduced output. As you are aware the pump works by virtue of the oscillating crankcase pressure. This pressure is also required to move the fuel mix from the crankcase to the cylinder via the transfer ports. If the seals are leaking there may well be enough pressure to vibrate the diaphragm of the pump but not push the fuel out of the crankcase. This is why I suggest squirting some fuel into the air intake of the carburetor.

Dave

pachanga90

Did you try starting it in reverse?Sometimes the case-seals will take up a better seal in reverse since they wear more in forward-rotation.Sometimes it works,sometimes not,but it may narrow your search.Also has it had any backfires lately?This can blow the seals.Hope this helps.

Phillip

I would say the problem is the Crank Case Seals.

Ga_goat

O K - time for update / jacked up back tire and sprayed starting fluid into open end of carb with engine turning over and no try to start , pulled plug and put gas directly into top of cylinder and it tries to start . / so I have the seals in hand ,,, man I'm dreading pulling that engine again . but we do what we must. Thanks all for the insite to my problem .

Lawn Dart

I am in the same boat as you. I was riding mine over the weekend and it popped and backfired a few times and shut off. It is not getting fuel in the carb now and it won't start off starting fluid in the carb. It will almost start. I am willing to be my seals are blown out also. Does anyone have a write up on this? i have been searching a lot before i posted.