Can't decide what carbs to use

I'm far from an expert, but I've personally ridden this bike and the combo is outstanding. 1075 kit, stock cams, some port matching, BS34's, pods, yosh pipe and dyna jet kit.

That's too pretty to run good!! :laugh: :woohoo:

"That's too pretty to run good!!"... He doesn't run it, only for pictures.... :laugh: :laugh: :laugh:

Extra $10 to sit on it and go rum, rum, rum (engine noise).... :laugh: :laugh: :laugh:

I want more images of this sweet ass beauty... KZ-PORN!

Old Man Rock wrote:

Via Nads...

"I've never had a set of cv's hesitate whatsoever, unless the airbox was off or jetting wrong.

Ask Larry 'c what happens when the dyno talks on this issue? Only prob is when u whack the throttle, the bike bogs and the front drops down proceeding are two consecutive front rolls."

You started off spewing I don't know shiza by quoting my response, then in the very next post you write about the problem the bogging effect... Somewhat as I wrote, low/mid range performance issue...hmmm, interesting.

Am I a carb expert, hell no, never claimed to be but I did do my research and have found here in KZR and other locations using search and in speaking with others with experience all state the same, stay away from them for a PITA to tune for ideal and desired performance/operations especially in my mild build..

BTW, Larry was one of the mentioned reliable sources regarding the preferred carb based on as I mentioned, riding style and engine/head mods...

Sure if you ride mid to WOT all the time, 34's will perform no doubt but who here truly rides that way more than 80% of your riding time on a street Kawi....

And this would still only truly work out regarding performance if the head porting and valve build is accomplished for the ideal air flow requirement.

If your into drag racing, 28mm would not be the way to go but as mentioned, his question is in regards to a street ride...

Dude, take your meds... :whistle:

A street ride is where the 34's will work well I'd gather. And you seemed to have testified to that by mentioning this "bog" seems to only happen when the butterflys are opend quickly not? . In the post I meant the 34's were supposed to bog terribly not the 28's. Now being that you were new to tuning may have been the reason noone wanted to see you having problems with 34's. I do believe they atomize the fuel better, but if better isn't what your after it's that is your call. You must realize inbetween shock treatment that at least, that you never actually ran 34's but intead opted for better carbs. I'm the same way, if I could afford taco bell anyday I'd NEVER eat at taco johns. Kawasaki made 34's work. Shame on you dissing them. Better take the scope along for the next ride, I think I'm hearing the definite sounds of a bearing going out. :ohmy:

fordtruck wrote:

I'm getting ready to put a 1075 kit in my 77 KZ1000 and I'm going nuts trying to decide what to do about carbs. I have VM26's on now. Here's a list of mods that will be done:

1075 10.5:1 pistons
Head rebuilt and probably mild port job
V&H megaphone with baffle
Air Pods
Dyna S with green coils

I won't be able to afford smoothbores. I'm torn between BS34's and VM28's. I had planned on running the stock VM26's for a while, but I may be able to squeeze enough money out for a different set. Can someone help me make up my mind? This bike won't be on the strip, I just want a strong street bike. And with 28's you will notice a diff. but 34's will make for a much stronger street set up, It's like comparing a red rider to a pump.

Thanks

PLUMMEN wrote:

i realize they put vac secondarie carbs on street driven cars which is much more drivable than mechanical,but putting a quadrajet capable of flowing 900cfm on a 283 chevy still dont work as good as a small 500cfm carb! :woohoo: a motor can only use as much air/fuel as it can suck into its cylinders at a given speed. try pulling a line of people that are 5' tall and weighs 400 lbs each through a 32"door then try pulling a line of people who are 6' tall and weigh 175lb each through the same door and tell me which one is easier to fill a room with. :laugh:

You went way over my head. Who gave you permission? I know when to duck but running vac secondaries like ducking school. And you know what that'll get you. I would never in my life run vac secondaries. Double pump open mechanical wumps on that set up. It's like this, if your engine can't handle the air you have no buisiness with such a carb on the machine. And I'm not even going to ask how you did it, but it was wrong. I tuned the quads by air valve spring pressure to create smooth predictable opening and max port velocity. It's all about that and you know that. Have you been down the road where you've tried every spring in the kit and not ONE worked for notin. I put a screw in the linkage and that's how you might win a race. I must be a lucky guy, my motors work! Had a quadrojet in my dresser drawer from a pontiac 400. I started early, I finished late, in the end ev thing was great. I just put a holley rebiult quad on a 305, performance guy said to my buddy it would be better than a 600 holley. Don't know but I by nature doubt it. The primarys are mush on those. Ev. one diff. Hey I'm wasting paper not?:lol:

You can't bog a set of BS 34'S. Roy

I boxed up your carbs. I am sending along one set of 120 mains and a set of 122.5 mains. Also four shims that go under your needles if you need them.

I couldn't find a 20 pilot jet but ordered them from Z1enterprises and will foward them when they come in.

If there are any problems let me know.

These carbs were on a friends bike a month ago while i rebuilt his. Roy

Well damn Roy... Since you're being so generous, can you send me another set of CR specials for my next build...
29 or 31mm would be fine nothing more than that is required.... :laugh: :laugh: :laugh:

OMR

Send me your old ones first!

roy-b-boy-b wrote:

I boxed up your carbs. I am sending along one set of 120 mains and a set of 122.5 mains. Also four shims that go under your needles if you need them.

I couldn't find a 20 pilot jet but ordered them from Z1enterprises and will foward them when they come in.

If there are any problems let me know.

These carbs were on a friends bike a month ago while i rebuilt his. Roy

Roy I never expected you to order jets if you didn't have them! Thank you so much! I take it that the needles are not adjustable, hence the shims. Putting a shim under the needle will richen it, correct?

Thanks again Roy. I can't wait to tear into this bike!

Yes, The shims will gas it up quicker.


I would try the carbs first without the shims.I just put them in there in case you wanted to try them.

I layed a set of non adjustable needles beside a set that was adjustable and they were the same. Same taper and all.

Now if i could only find the adjustable set. Roy