95 SPX runs good for 10 minutes then barely runs/dies

[NoelNicklasson]

The spark plugs are brand new (NGK br8es) and the battery is also brand new. And the compression is 150psi on both jugs. is 150 good? or should it be higher?

i will test the trigger pickup. i found a vid on youtube on how to do it.

 

[mikidymac]

Compression is perfect.

 

[POPPS]

Compression gauges, all of them, (even snapon), are not exact, usually it's the 10 % rule, that the compression between cylinders is 10% of each other. therefore a weak cylinder does not appear to be an issue.

 

[POPPS]

Almost seems to appear to be a fuel flow problem at this stage, is your fuel filter/water separator full if you remove it?

 

[NoelNicklasson]

Almost seems to appear to be a fuel flow problem at this stage, is your fuel filter/water separator full if you remove it?

Yep it's getting fuel. Can it be the CDI?

 

[NoelNicklasson]

It's now working! It runs great! I re wired all the grounds, and the reason I think I thought it wasn't working is that it was fouled up really bad after i changed the ignition coil. So I dryed the spark plugs, and it fired right up. Damn this thing is fun! So the issue was either the ignition coil or bad ground. Thank you to everyone who helped me! One question, it says 657x on the engine, but it does not have the same exhaust as my 1994 xp, it's way smaller. Is it still a 657x or is it a normal 657?