Super Jet another superjet that won't start

[sdoublea]

I'm a new member, first time poster, long time site follower. I've been wearing out the search function for a week now with no luck. You guys have a vast sea of knowledge, so let'er rip.

Here we go:

1990 SJ 650

ROGO head (180 PSI cranking on both cylinders)
Protec exhaust
mikuni 46, rebuilt last year
new plugs
new coil

Will turn fine, will not run. Ran fine all day, then at random it shut off and would not start. let it sit for an hour, then it ran fine again. Then again, it shut down on me and would not crank. Now the problem is no longer intermittent.

compression is 180
has spark, with new plugs and new coil, maybe the spark is faint, but i'm not sure
confirmed the carb is getting fuel by removing the main line and return from the carb to the tank and blew into the return line.
sprayed WD40 into the carb intake, nothing.
I've bypassed the start/stop switch, so that's not the problem
battery is good, and I've used a booster. starter turns the engine over plenty fast, just no fire.
Ohms meter confirms good ground to the engine and cylinder head.


The little icon that bangs his head into the brick wall doesn't even sum up my frustration.


It seems I have checked all parts of the equation except timing. Any ideas on this? could the timing have jumped?

Please, help a fellow rider keep his sanity. thanks in advance!

AA

 

[sdoublea]

anyone?

 

[tor*p*do]

check to make sure you didnt break the key and slip the flywheel
if you have compression, fuel and spark
it must be timing

 

[WaveDemon]

I'd double check to make sure the ground in the ebox is good (ohm the ebox aluminum back to motor). Torpedo's idea of checking woodruff key under the fly wheel is good too. If you have a cdi to swap out I'd do that too.

 

[BruceSki]

cut back the plug wires and try a little premix down the carb instead of wd40.

 

[bhy]

superjet wont start!!

I am having a similar problem. My 04 superjet was running like a dream and then I pushed the stop button and it wouldnt start back up. Kept clicking, wouldnt even turn over. Waited for about an hour and then it started back up, rode for about 10 minutes, shut it off and now it wont give any sound at all when I go to start it. I already swapped out the battery for a brand new one. The Yamaha service manual is useless, does anyone have any ideas? Im new to the superjet.

 

[sdoublea]

UPDATE:

thanks for the replies. I had already tried all the above suggestions. Found the repair manual here on the X and checked the ohms specs on the CDI, they were way out of spec. found a company that stocks them new for about $160 out of St Petersburg called Jetskiparts.com. I've bought a few parts from them, good pricing, super fast shipping. I'd recommend to anyone of the east coast. (no affiliation) Replaced the CDI box and she fired up like there was never a problem.

to BHY: sounds like a start/stop switch problem, unplug the harness with the white and black wires coming out of the elect box about 6 inches out and see if she fires.

Thanks again guys!