Air Mixture Screw Identification Help

[Applepi]

I recently bought a 1978 XS400 on the cheap. I am looking to replace the air mixture screws because the tip broke off one of them. I want to make sure that I order the right part the first time. What better way than to ask the experts.

So when I search the Mike's XS site. I cant find any that are specifically for the 78 xs400 with the mikuni CV carbs. These are the two parts that look very similar to the screws that I have but I'm not sure if the would work. I can upload pictures when I am done with class for the day. Thanks! Any help would be appreciated!

http://www.mikesxs.net/parts/yamaha-xs650-carb-mixture-screw-kit-80-84-bs-34-oem-12r-14105-00

http://www.mikesxs.net/parts/yamaha...bs-oem-3f9-14118-00-3h1-14147-00-3h1-14962-00

 

[HoughMade]

I have a '79 and they look more like the first one, but not identical.

Were it me, I'd take it out...as that's the ultimate goal anyway, and compare them directly.

 

[xschris]

Those are different than what the 77-79 sohc xs400 takes. Those are for the 80-82 sohc ones. Mike don't carry them for 77-79 bikes. Post pics of what you have to make sure of your year as people tend to swap out different year parts on these bikes.

 

[Applepi]

Here is a picture of the mixture screws I have now. No sign of a O-ring. I can get pictures of the carbs Monday.

 

[xschris]

Those are off the 80-82 sohc carbs. Should have a washer and o-ring also.

 

[Applepi]

Those are off the 80-82 sohc carbs. Should have a washer and o-ring also.

Ok so I saw on another thread that the bs34's for the xs650 is mainly the same as my carbs besides a select few parts. Is that correct? Also thanks for your help on this! It is much appreciated.

 

[xschris]

Gaskets, jets( main and pilot), slides, float valves and o-rings, idle mix screws, pilot jet plugs. The things that are not the same are slide needles and needle jets.