[jjdluz]

like to find out why yamaha 200 one cylinder is dead,unplug the ignition core,it didnt change running,swap the plug and core do the same thing,i will check carb give any gas to that cylinder first,if does,what would u look at next?open the cdi box check wire,or check something else?thanks.

[drewmitch44]

Compression test first! Dont do anything else til you do that. It will tell you a lot. Do all the cylinders. What is the model number of your motor. A lot of people here can help you! You need to give as much info on the motor as you can though!

[jjdluz]

compression is 1-3-5-110,2-4-6 115,and have orange color spark all 6 cylinder,ignition core and plugs are good,why color is orange?

[reeldutch]

what year and what engine is it?

some motors dont run on all 6 at low rpm to reduse emisions.

[jjdluz]

i have 1992 yamaha 200 txrq,thanks.

[Capt Ken]

Yamaha's run a weaker spark than their counterparts from Mercury and OMC. If you have compression and spark, drop the air silencer and squirt some gas in the throat of that cylinder and see if it picks up.

[jjdluz]

thanks,ken,that is what i gonna do next,but if does have gas go to that cylinder,what do u sugest i do next or check next?thasnks.

[Capt Ken]

Compression, spark and fuel. Gotta have all three to run. Don't forget it could be flooding the cylinder with fuel and not running also. Make sure its not spitting out the front of the carb. That would be due to reeds not sealing and thus not sucking fuel.