2000 yamaha 200hp ox66 backfiring

southern approach · 01-31-2010, 06:19 PM

Just had motor rebuilt.after found the moon key on flywheel sheared replced that.all wiring grounds etc are in the right spots, plugs look good.engine is backfiring bad.timing is good.need help

Sequoiha · 01-31-2010, 06:24 PM

could be leanspitting, maybe link and sync,, also did they service the o2 sensor,, this is very important,,,

southern approach · 01-31-2010, 06:40 PM

don't know if they touched the o2 sensor.we took it off and it looked fine.we put way to much money in to it to have it rebuilt and now it doesn't run right.what else could it be?

Sequoiha · 01-31-2010, 10:22 PM

I would start with link and sync,,, and I cant look at an o2 sensor and tell if it is ok,, it needs to be checked, I would be glad to help you out on this,,,

01-31-2010, 06:19 PM	#1
southern approach Senior Member Mingo Join Date: Oct 2007 Location: NAVARRE FL Posts: 117	2000 yamaha 200hp ox66 backfiring Just had motor rebuilt.after found the moon key on flywheel sheared replced that.all wiring grounds etc are in the right spots, plugs look good.engine is backfiring bad.timing is good.need help

01-31-2010, 06:24 PM	#2
Sequoiha Senior Member Sailfish Join Date: Sep 2007 Location: Pensacola Florida Posts: 2,477	RE: 2000 yamaha 200hp ox66 backfiring could be leanspitting, maybe link and sync,, also did they service the o2 sensor,, this is very important,,, __________________ Kenny Mann Ms Penny Fishing Team Member NRA 172499461 Minn Kota ASC Dealer for The Super Stick www.thesuperstick.com Emerald Coast Marine LLC Allmost Anything Computers 4610 Saufley Field Rd Pensacola Fl, 32526 1-850-456-8196 1-850-455-8318 Sequoiha@cox.net Kenny_Mann-ECM@cox.net

01-31-2010, 06:40 PM	#3
southern approach Senior Member Mingo Join Date: Oct 2007 Location: NAVARRE FL Posts: 117	RE: 2000 yamaha 200hp ox66 backfiring don't know if they touched the o2 sensor.we took it off and it looked fine.we put way to much money in to it to have it rebuilt and now it doesn't run right.what else could it be?

01-31-2010, 10:22 PM	#4
Sequoiha Senior Member Sailfish Join Date: Sep 2007 Location: Pensacola Florida Posts: 2,477	RE: 2000 yamaha 200hp ox66 backfiring I would start with link and sync,,, and I cant look at an o2 sensor and tell if it is ok,, it needs to be checked, I would be glad to help you out on this,,, __________________ Kenny Mann Ms Penny Fishing Team Member NRA 172499461 Minn Kota ASC Dealer for The Super Stick www.thesuperstick.com Emerald Coast Marine LLC Allmost Anything Computers 4610 Saufley Field Rd Pensacola Fl, 32526 1-850-456-8196 1-850-455-8318 Sequoiha@cox.net Kenny_Mann-ECM@cox.net

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