On side of road tested for spark, no spark, fuel pump primes ok, Trailered home.

After reading thru forum, thought it was the CKP SENSOR, ordered one, installed it, cranks & won't start, cleared error codes P0151/P0152/P0373
Tested spark again, front plug no spark
Checked and cleaned fuse ends.
Could it be the relays,?

 

check the connectors and wiring down there. It’s suspicious that all 3 codes point to sensors with connectors in the same area. Don’t worry about your O2 sensors at this point— you could unplug them and the bike will still start and run. Since you changed the ckp, I would go after the connector. Good luck!

 

leave the plugs in the bike and use an extra plug when checking for spark, as the engine needs to see compression for the ecm to spark. Which leads to the next test, check the compression on both cylinders. Are the plugs wet when you checked them?

 

I tested spark with other plug out of cylinder, didn’t check plugs. Bad coil? ,ECM?

 

put the plug back in and recheck.

 

Paul is right, you won't get any spark unless the rear cylinder has compression. It's the reason why you see spark when only removing the front.

 

Uodate:
Got spark on both plug wires, still won't start, plugs were clean, fuel pump primes before cranking,

 

Next thing is to check fuel pressure.. If you disconnect the fuel line from the bottom of the tank, does it spurt a little gas? Might need a fuel pressure gauge..

You can also squirt a little gas into the intake to see if it will sputter / run a little.. Don't set anything on fire..

 

sounds like that infamous fuel line in the tank popped off....

 

disconnected tank line and gas leaked.