Blaster with 1100 not firing right just popping

[yama-doo]

Me again, this is my son B1 project we do a little here and there so far we have the basically stock 1100 Yamaha (was in parts when we go it) mounted in the B1. I rebuilt the crabs and fuel pump we have fuel to the plugs , we have fire at the plugs when we spin it over mostly will not start but every now and then it try to fire but its like its on the wrong cylinder or something we get loud POPPING like a canon going off out of the exhaust........... is there way we got the wiring in the elec box out of order or does anyone have any other ideas what to check next?????

 

[motoman3000]

Plug wires are cylinder-specific on the triples. Maybe they're backwards

 

[yama-doo]

on the top or inside the elec box on front of engine?

the top plug wire length for the first cylinder has to be the one wire the other two could be switched but length of wire seems like they would be right . If I pull all the plugs I can see all plugs fire but can't really tell witch one fires 1,2,3

 

[motoman3000]

I had my ebox rebuilt and I relocated it w/ the raddudes brackets in front. The shortest lead and longest were backwards which caused backfire.
Luckily the short plug wire reached the rear (pto) cylinder. All was well after.
Not sure how your stock ebox is labelled on the coils inside. I would switch the mag and pto wires to see if anything changes, if it reaches.

 

[Twinturbostang]

open it up and swap the 1 and 3 wires to the coils from the cdi. unplug 1 and plug it in 3 and plug 3 in 1.

 

[yama-doo]

ok thanks I will try to ope it up and swap the 1 & 3 wires inside cause the 1 wire is to short to reach any other plug . the plug ends where cut off when I got it so maybe it was longer before

 

[Twinturbostang]

ok goood, ya thats why you have to swap the CDI plugs inside.