25 electric start evinrude 1998

[2mate]

Right my 25 electric start evinrude 1998 wont start. The compression is 110psi on both cylinders both sparking and fuel is getting in. What else can it be? It just spins on the starter and occasionally back fires?

 

[wifisher]

Re: Where the hell now?

Re: Where the hell now?

Did you check the flywheel to be sure that the key is not sheared?

 

[boobie]

Re: Where the hell now?

Re: Where the hell now?

If your spark will jump a 7/16 " open air gap, do what was said above.

 

[2mate]

Re: Where the hell now?

Re: Where the hell now?

Okay il look tomorrow but surely if it had sheared the pistons wouldn't move? Also do you have a picture cheers

 

[Auxlarry]

Re: Where the hell now?

Re: Where the hell now?

Not necessarily! The flywheel key can shear and allow the flywheel to rotate around the shaft until the broken bits of metal from the key wedge in the taper thus causing the engine to turn over but be way out of time. It is worth a check.

 

[kenmyfam]

Re: Where the hell now?

Re: Where the hell now?

Right my 25 electric start evinrude 1998 wont start. The compression is 110psi on both cylinders both sparking and fuel is getting in. What else can it be? It just spins on the starter and occasionally back fires?

How did you test the spark ???

 

[emoney]

Re: Where the hell now?

Re: Where the hell now?

Probably a silly question, but I hafta ask. Did you check the kill switch?

 

[samo_ott]

Re: Where the hell now?

Re: Where the hell now?

Ah, the real question is, did you accidently reverse the plug wires? It happens a lot. The backfire usually gives it away.

 

[JB]

Re: Where the hell now?

Re: Where the hell now?

http://forums.iboats.com/showthread.php?t=158071

 

[2mate]

Re: Where the hell now?

Re: Where the hell now?

Also would the compression not be affected? Its at 110 psi

 

[wifisher]

Re: Where the hell now?

Re: Where the hell now?

Also would the compression not be affected? Its at 110 psi

Would the compression be effected by what? Flywheel key, no. Plug wires crossed, no. Kill switch, no.

 

[RogersJetboat454]

Re: Where the hell now?

Re: Where the hell now?

Also would the compression not be affected? Its at 110 psi

Not one bit.

It's ignition timing, not cam timing.

Cam timing being off has the potential to change compression, but you don't have to worry about that issue with your 2-stroke.

 

[2mate]

Re: Where the hell now?

Re: Where the hell now?

Okay so the key if shreaded will be in peices? And if i replace that the timing will be back and okay?

 

[RogersJetboat454]

Re: Where the hell now?

Re: Where the hell now?

Okay so the key if shreaded will be in peices? And if i replace that the timing will be back and okay?

If it's sheered, it will most likely be broken in half. One piece stuck in the crank, the other piece stuck in the flywheel.

Replacing the broken key will set the flywheel back where it's supposed to be to fire the ignition at the correct time.

 

[2mate]

Re: Where the hell now?

Re: Where the hell now?

Hi guys,
Took the flywheel of and it was sheered. luckily i had a spare and its started fine only thing is is that the engine starts and missfires and stalls. Although when i spray carb clean in it runs fine, any ideas?

 

[wifisher]

Re: Where the hell now?

Re: Where the hell now?

Sounds like a fuel restriction somewhere. Check your gas tank, fuel lines etc. for obstructions. Filter could be plugged, or the carbs may be dirty.

 

[2mate]

Re: Where the hell now?

Re: Where the hell now?

Other problem is blot of white smoke which I think is due to water in the bore?

 

[boobie]

Re: Where the hell now?

Re: Where the hell now?

After you replaced the key, did you torque the flywheel nut down to the right specs??

 

[2mate]

Re: Where the hell now?

Re: Where the hell now?

Yes as stated in the service manual