Help me decide

T_Dub wrote: Yeah I knew about that page, but he doesn't talk about the KZ1000 VM28's.

Aren't the "later" VM28s basically bored out VM26s from the 900/1000s equipped with the better linkage?

They look almost identical other than the accel pump, so that's a possibility.

my 80 LTD has 28's with pump. If they are original to bike?

I am not in any way going to stand up as a carb expert - my knowledge comes mostly from what I have read. And this suggest that smootbores are only desireable for racing since they do not carburate as well as normal carbs during small throttle openings, nor at lower revs. So for street riding, chances are that you'll be much happier with a set of 26 or 28 mm standard piston carbs.

faffi wrote: I am not in any way going to stand up as a carb expert - my knowledge comes mostly from what I have read. And this suggest that smootbores are only desireable for racing since they do not carburate as well as normal carbs during small throttle openings, nor at lower revs. So for street riding, chances are that you'll be much happier with a set of 26 or 28 mm standard piston carbs.

you may not be a carb expert but i think you nailed it
yes rare race carbs are cool
yes they look cooler then shit
yes they deliver more horsepower
yes they cost more coin
theyre like a beautiful woman that will do it all
but happens to be crazy as a bag of farts
will you keep going back?
depends on you intentions i reckon

My experience, again, my experience is with smoothebores is the 29's are absolutely the smoothest through the entire range of any carb I have ran, from idle up, even on an almost stock 750. The 33's run GOOD! but you have to be awake when you have them, they will bog if not in a sweet spot. 33's don't have the greatest street manors but the 29's do. Like I said, my experience!

Les Holt

les holt wrote: My experience, again, my experience is with smoothebores is the 29's are absolutely the smoothest through the entire range of any carb I have ran, from idle up, even on an almost stock 750. The 33's run GOOD! but you have to be awake when you have them, they will bog if not in a sweet spot. 33's don't have the greatest street manors but the 29's do. Like I said, my experience!

Les Holt[/quote

plus 1

Ok I'm gonna chime in here, not sure what cams you are gonna run in that 810, I spent most of last summer tryin to make some RS34s work on my 810 with 118 web cams, thought it was a carb problem, turns out the engine got warm and the cams were loadin up and foulin the plugs. I put stock 650 cams in the engine and the rs 34s run just fine.


Godfrey

What do you mean by loadin up? I'm running GPz750 cams in a Cavanaugh Racing stage 1 KZ650 head. I have KZ750 intake valves, KZ650 exh valves and APE springs.

Boy did this thread just go south. :S
Jeffasaki says faffi is right about smoothbores being race only carbs that run terrible on the street, which they are NOT, then he agrees with les holt 100% that they are absolutely the smoothest running carb you can run. WHICH I TOTALLY AGREE WITH.

Jeffasaski, man, what side of the fence are you on? :laugh:

faffi, I don't know where you got your info, but it couldn't be further from the truth.

les holt nailed it.

Godfrey, how do cams "load up"? :whistle: That's a "loaded" question.
Cams don't load up. Your tune causes the engine to load up(with excess fuel) and foul plugs. Ignition timing, compression ratio, cam timing and then carb jetting, can cause plugs to "load up".
Everything has to be set correct for a certain cam grind to work properly.
Sounds like you had too much overlap for the C/R, cam set-up, and ignition timing you were trying to run with that combo.
What pistons did you use in your 810. C/R?

The 810 kit is a 10.25:1 CR. Unless he had his head decked. The cams "loading up" is a weird thing for sure.

Anyways, the point of this thread was to help me decide what carbs. I've decided I'm gonna buy a set of RS34's from Schnitz Racing, as they are the cheapest. My good friend who knows more about big 650's than anyone I know says that Mikuni themselves admitted that the needles are for racing 750's. I bet they'll work real well. I'll report back about it in a month or so.

race carbs dont run crap on the street
race carbs ask for everything all the time
street carbs are fine if thats what you want or need
for a older gentleman with a old bike
whose ran both setups
I ll use the street setup on the street
BUT if I wanna go racing for the weekend
then I ll install the appropriate equipment on the old girl
to achieve the desired results
I guess you could say im on both sides of the fence