750sx hesitation while starting, help appreciated

[Lanmoe]

Hi guys this is my first post on here, it seems like there’s many credible people on their forum so wanted to throw a problem I have out there. I have a 1992 750sx with a fully rebuilt oem engine, 170psi, coffman rocket pipe with inline silencer, SBN 44.

I have constantly had this starting problem and can’t figure it out for the life of me. The ski has a good flywheel with all teeth, new stator, good bendix, good starter. I also have replaced the starter relay, cdi with a wsm one, ignition coil and regulator have also been replaced. Battery is brand new and is good.

When I start the ski it hesitates and pauses until it starts, but it starts everytime. I should note that I can have the spark plugs in with the caps off and it turns over great, but as soon as I put the spark plug caps on and give the cylinders spark it has the pause hesitation sound before it starts. if anyone has had the same problem or knows what going on, I appreciate you very much. Thanks

 

[Myself]

Sounds like a weak starter OR too much timing advance. You can check advance by bringing front piston to TDC and marking the pto coupler with a sharpie.....relative to the cover bolt hole or something....mark it "0". Then do the rear piston the same.....mark it "180". Then use 2 equal length dowels or even straws into the cylinders and rotate until both are at the exact same height and mark again, make sure this mark is between the other 2 in the correct rotating direction of the engine. You would now have marks for 0, 90, and 180 degrees of timing. Now you can use a seamstress tape or string and divide that 0-90 in 9 equal sections. Now you have a proper way to measure timing with a timing light. I've seen stock AND aftermarket cdi's throw timing way out of whack.

 

[JC-SuperJet]

Are you using all three Resistor Plugs, Resistor Wires and Resistor Caps? All three together would give too much Resistance to the Igntion Coil Voltage supply. Use only 2 Resistor Components, not three.

Also clean the Start/Stop Switch Metal Contacts.

 

[Lanmoe]

Are you using all three Resistor Plugs, Resistor Wires and Resistor Caps? All three together would give too much Resistance to the Igntion Coil Voltage supply. Use only 2 Resistor Components, not three.

Also clean the Start/Stop Switch Metal Contacts.

Are you referring to the spark plugs caps and wires? Or something inside the ebox