Which carbs to use?

I have a kz1000st with 1045 10.25-1 pistons, 380 lift Harmon cams and a Mac 4-1.
I have the stock set of 28mm non pumper (canadian model bike) carbs on the bike right now. With the new intakes I'm putting on today it should run well. I have a line on a set of 29 smoothies for about $450 or a set of RS34's for about $225.
Now, my thinking is, the 29's offer the simplest install and original look for the bike but, $450 is a lot of money for a set of old tech carbs that will need to be gone through. ( I've never really been a believer in 1mm larger smoothies benefitting power output by much- maybe somebody could clue me in on this).
The RS34's are a bunch lighter, more compact, newer technology, have an accellerator pump, but I will need new manifolds and will have to try and blend the manifolds and intakes for them to work. I will also have to give up the stock airbox and perhaps open a can of worms with pod filters.

Your thought and opinions please!

thanks.
Don

Based on your engine build.... No brainer.

RS34's for the newer technology, smoother operations, easier to jet/dial in when required, easier to obtain parts for and as you mentioned, @ $225 that's a smoking deal for those carbs.

Im using RS34 on my ride....having trouble getting color on plugs.....stock carbs and setup but for these changes.

Main jet from 115 to 125

Moved needle up one.

Pilot screw is 1 turn. Book says 1/4 to a 1/2 turn....why do I have to go out to 1 turn???

Might have to change the Needle Jet up a few sizes. Im at stock 568 P-4 now.

Still abit lean on plug reading with changes.

Going to have Dyno Tuned this spring.....and get it nailed dead on!!

With your setup.....should be a boltup and go....wont have a lean problem.

Go with the RS34's. They are easy to tune and they will give you very good drivability. I have a set of RS36's on my FJ1200 and a set for my 1980 KZ1000.

Old Man Rock wrote: Based on your engine build.... No brainer.

RS34's for the newer technology, smoother operations, easier to jet/dial in when required, easier to obtain parts for and as you mentioned, @ $225 that's a smoking deal for those carbs.

Yeh, I agree, just wanted to make sure I wasn't missing something. I was a little choked that my 28's that I rebuilt were not firing on #1 at idle and part throttle. I blamed the old manifolds that were probably a bit leaky. Today I replaced the manifolds with new and improved one's. I thought it would be a good idea to check the pilot jet on number 1 for blockage. When I took the bowl off, the pilot was no where to be seen!! Doh!! I don't know how I missed that! I found it in my jet box, put it all back together and it now runs PERFECTLY!
I will probably still get the RS 34's and change them out after I get to ride the bike for a while as is ( I've never ridden this bike yet). When i get the seat rebuilt she will be ready to roll.

4TheKZ1000 wrote: Im using RS34 on my ride....having trouble getting color on plugs.....stock carbs and setup but for these changes.

Main jet from 115 to 125

Moved needle up one.

Pilot screw is 1 turn. Book says 1/4 to a 1/2 turn....why do I have to go out to 1 turn???

Might have to change the Needle Jet up a few sizes. Im at stock 568 P-4 now.

Still abit lean on plug reading with changes.

Going to have Dyno Tuned this spring.....and get it nailed dead on!!

With your setup.....should be a boltup and go....wont have a lean problem.

Thanks for the input. How are the RS34's for fuel mileage on your bike? I don't care that much about fuel cost on the bike but its nice to have a decent range.

I really dont know, never checked as its the last thing on my mind.....idles at 1050 rpm due to cams. Have it set pretty fat...if I had to guess....maybe 20 miles to the gallon?