1st Gen XVZ Idle Mixture Screws

[fmandcac]

Hi, this is my first attemp at this so please bear with me? My wife, Claudia Ann and i have 2 of the 1st Gen XVZs, a 1984 and a 1990. I have purchased shop manuals for each but find nothing in the manuals about either setting the idle mixture screws or how to find them on the carbs. I've read other threads that talk about the proper setting being 2 - 2 1/4 turns CCW from very carefully closed position. That's great, but i've looked at the carbs on both bikes several times and have not found what would even seem to me to be 'idle mixture screws'. I have even purchased parts manuals for both bikes and the exploded parts diagrams of the carbs and accompanying parts list does not list 'idle mixture screws' anywhere so i cannot tell even looking at these diagrams where they might be. Does anyone know what Yamaha calls these screws if it is something different than 'idle mixture screws'? It might be less confusing for those of us that new to this sort of thing if in the threads everyone would use Yamaha's term/names for parts and what is being discussed. How about a few pics to show where they are located? Anyway, thanks in advance for any help offered!

 

fmandcac

[Squeeze]

Part no 19 in the Fiche

 

Pilot Screw

 

http://images.powersportsnetwork.com/fiche/images/Yamaha/1990/Motorcycles/385_carburetornoncaliforniamodel.gif

[Squeeze]

They are beneath the Diaphragm Bowls. If there are Brass Plugs (#20 in the Fiche) nobody touched them before.

[hipshot]

following the diagram that squeeze posted, if you see a brass cap, on the external side of each carb, then they are still at factory settings.

if the slotted head of part # 19 is visible,way down inside the opening, then they have been adjusted/ tampered with, and may need resetting.

in the first gen tech. section, there is a lot of GREAT info about your carb set ups.

if you need further assistance, some one will be along shortly! oh. welcome to our house!

just jt

[fmandcac]

This is really great guys! Thanks so much for helping me with this one. I have just returned to the PC after reading your replies, i grabbed the nearest flashlight and a 1/8" cabinet-type screwdriver and headed to the garage on a mission of discovery. Having located the idle mixture screw for the #1 carb (I think) rear carb on left, i was curious to see what i'd discover by turning it CW until very lightly seated. Was i surprised when it was 4 turns CCW from very slightly bottomed in the seat. Well, i proceded to back it out 2 1/4 turns CCW from very slightly bottomed. Now i'm excited to check out the other 3 but as i'm sure you guys know, i'll have to remove the lower fairing pieces that coverup the 2 front carbs. I picked up this bike (1984 Venture Royale) north of Denver last May and rode it home to Houston with it running pretty badly so I've been trying to learn about these pesky screws to adjust for many months. Having read many of the 'threads' posted here, it took me until this afternoon reading someone else's thread, how to write a thread and how to reply to one. I know it sounds pretty dumb, huh?!! )

 

Thanks again for the tips!

 

fmandcac

[Dano]

Get that done, get ahold of some of our guys down there, get it carbtuned, colortuned (if you can) and most definately Synched up. Then sit back, hold on, shut your mouth (you can still smile), grab a big handfull of right wrist action, and have some fun!!!! Oh, you might have to wait on your wife if she's riding that MK11 bike, as she won't be able to keep up with you!!!!

You might be careful when you hit second gear though, as you're not yet sure about the dreaded 2nd gear issue with your 84. If you hear it jumping out, get off the throttle quick. If you take it easy in 2nd, it could last a long time till you get up the courage to fix it. I just did mine, if you're mechanically inclined, not a big deal!!!

 

Good luck,

 

Dan

[Venturous Randy]

Ok fm, if you rode your bike and it was running poorly after sitting awhile, I bet that you need to clean out your pilot jets. Clogged up pilot jets will do a big number on how the bike runs. That would be either #40 or #42 in the picture. The holes are very small, but they can have a big impact.

RandyA

[fmandcac]

Hey RandyA, won't i have remove the carbs from the bike to do what you suggest in your reply to me? Thanx a lot for trying to help me learn about these great bikes. We have 2 of them actually. The other is a 1990 and it runs great, but does have a few oil leaks here and there, a slight coolant leak i've not been able to track YET, and the fork seals began leaking a while back. We've put almost 13K miles on it since buying it last July. FM

 

[Squeeze]

Good Morning,

 

in my Experience, i'd say not to tinker around with the Carbs if you want to keep the Ride for a longer Time.

 

Get them off the Bike, take them apart completly, bring them somewhere and have them cleaned with a ultrasonic Cleaner. Then put them back togehter and have a secure Point made and it's done right without leaving any Doubt.

 

The Result is Loss of some Money, gained Power and gained Consumption.