1980 XS850 Carburetor Mikuni OR?? HELP

[bab59]

Building a 1980 XS850G has 8150 miles on it. Been parked since 1992 with a bent exhaust valve. Got the motor tore down getting ready for reassembly. I want to scrap the hitachi carbs since I am getting away from using the air box. iam looking for carburetor choices and opinions. The ones I have my eye on are from a 1987 GSXR 750 BST34SS carbs.(of course I will have to use 3 intstead of 4 and make new carb mount)
Are the intake sizes the same?
Any help is greatly appreciated as all this is semi new to me. I do not think I want to mess with the stock hitachi carbs they are looking real bad inside the bowls.

HELP

 

[xb33bsa]

just a show bike right ? not for street use ?

 

[bab59]

This one will be a daily street bike.

 

[xb33bsa]

then put a muffler on it
there are already way too many assholes running no muffs
are you that needy for attention ? ???
besides why would you want to reduce the performance of the bike ?

 

[teazer]

"Daily street bike" and "no muffler" cannot peacefully coexist in the same sentence. That's an oxymoron.

 

[bab59]

I am in the building stages here. Mufflers I currently have are junk. I WILL be running mufflers.
Any suggestions on the GSXR carbs?

 

[xb33bsa]

you are still looking at dialing in some carbs nothing will be bolt on and go
why not just restore the hitachis? it will be less work than anything else

 

[bab59]

I understand. But it seems like everyone is talking about alternatives to the stock hitachi's. For parts, adjustment etc. I want to be able to tune it in nice. And since the hitachi's that came on the bike may be junk, I want to upgrade and rebuild something worth rebuilding.

 

[xb33bsa]

the cylinder/carb manifold spacing on your bike is an issue,it has cam chain at one end and even spacing finding a set of carbs with same spacing off a 4 cyl is proly going to be limited to the 4's that did not have a center cam chain but still then the spacing matched is what makes or breaks the deal
go with whatever is proven to work for the bike, if somebody has a proven retrofit copy that lashup is my best suggestion

 

[sharperdill]

Best use of the time and money right now would be to carefully inspect the Hitachi's and see if they are salvageable.. Hours and Days can be spent jetting a carb to run right if the correct equipment to check air/fuel ratios is not readily available. I have seen guys spend alot on jets and needles trying to find the right combo. Yamaha has already done the R&D on the Hitachi carbs I would take advantage of that.

If you insist on setting up some different carbs, there is lots of info on yamaha-triples.org http://yamaha-triples.org/forums/thread-view.asp?tid=19292&DisplayType=flat&setCookie=1