96 Challenger wont start

[jritt38]

I have a 96 seadoo Challenger. I put a 787 motor from SBT it and I cant get it to run. When I set the rotary valve to where it is suppose to be set it just backfires out of the carbs. I can turn the rotary valve one click counter clockwise and it will start and idle but wont take any throttle. I also hear a bad vibration in the jet pump while it is idling but that could be where it is running rough. Any ideas where to look would be greatly appreciated. Thanks

 

[kustomkarl]

The rotary valve should be set to 147*. If the problem persist call sbt...it's their engine under warranty.

Karl

 

[jritt38]

Thanks, That is where I set the rotary valve and it would not even act like it wanted to start. I called SBT's tech line and they said they didn't know what the problem could be.

 

[timmyboy76]

sounds like, you got it timed, 180* off. with it timed right, 147*/65*, the RV should be block'n the PTO port-hole.

 

[jritt38]

I timed the rotary valve to 146.5 and 64 with the # 1 piston(mag) at TDC. It looked just like the picture in the installation instructions. Is there any way I could have messed up the electrical timing during motor swap? thanks

 

[cjb]

What about the Flywheel. If the key or Keyway are bad then timing will be off

 

[jritt38]

I installed the flywheel with a new woodruff key. I had a friend say he thought the spark was a little weak. Does that mean ignition coil?