dead cylinder... confused

[Justrawbee]

so my 94 max acted like it fouled a plug the other day. I gimped home (a mile or so) and i can't figure out what is up with it. rear right cylinder is dead. has spark. and plug is wet... when i put on the choke it seems to heat up with the others. i pulled the gas line and ran a bunch of seafoam in to the carbs and let them sit. drained bowls/refilled several times. nothing. i pulled the airbox, using a plastic syringe i shot seafoam through the jets. nothing. i am thinking plugged slow jet? problem is i have no book for the bike.. is the slow jet in the top of the carb next to the main? there looks to be one that maybe is pressed in? but looks to have a pretty large orifice... idk.... frustrating. any ideas?:bang head:

 

[johnpclynch]

Maybe the mixture screw is blocked?
Air leak around the rubber carb mounts/balancing port?
Spark is too weak/plug gap too wide?

I get a dead cylinder now and again but it's almost always after I was working around the battery and moved the coil connectors (even though I have COPs now)
Just check that everything is plugged in nicely and the spark plug covers are properly insulated etc

 

[DMAN999]

Here's a link to the Haynes Manual:
https://dl.dropboxusercontent.com/u/55030067/Haynes%20VMax%20Service%20Manual.rar
And the Yamaha Service manual, Owners manual and Microfiche:
https://dl.dropboxusercontent.com/u/55030067/VMAX Manuals.rar

PS
Pictures of our Carbs (with Jets noted) are here:
http://vmax.lvlhead.com/tips/shotgun.htm

This might help also:
http://www.youtube.com/watch?v=xItRzty9_hA

 

[johnpclynch]

And one to the shotgun procedure
http://vmax.lvlhead.com/tips/shotgun.htm

 

[Justrawbee]

very helpful guys. thank you so much. I will let you know how I make out. I'm finishing up a xs650 bobber and I will be back on the max this weekend.

 

[johnpclynch]

xs bobber... mmmm
I would never be able to decide between a cafe/tracker/bobber - one of each maybe?

 

[06VMAXIMUS]

Needs spark, timing, fuel, and compression to fire. Plugs wet so your getting fuel. Timings ok or it wouldn't run at the other 3. So that leaves spark and compression. I would check to see your are getting a strong spark, then do a compression test. Good luck with it, let us know what you find!

 

[wildweasel_pt]

I would also go for plug replacement and check gap on the new one...

 

[Justrawbee]

Should have stated this before.... i had great fire, and switched plugs (thinking maybe it wasn't sparkimg under compression) same cyl dead. So anyway did the shotgun blast thing. And it came right out of it. Thinking i should pull the rest of em apart and do em all. But for now she's running like a champ again! Thanks everyone! Back to the xs. that is till the old ladys bike needs something. Lol