Author Topic: Mikuni RS34's & CB 750 (Read 40517 times)

Leino · « **on:** March 14, 2011, 02:25:49 AM »

CycleX sells Mikuni RS34's spaced to fit the 750.I assume they can be used with late model carb boots.

Has anyone tried these? I know they are very nice carbs and easy to deal with, both my GS's work great with RS40's and tuning them is made extremely easy.

Would be a lot cheaper option than the TMR32's I've been dreaming about

Before anyone says they are WAY TOO BIG for a stock engine, my engine isn't exactly stock

Juha

Retro Rocket · « **Reply #1 on:** March 14, 2011, 02:35:36 AM »

Subscribed. Very interested to hear the reply's Juha I wish to use some on a second engine i have {no where near stock} and i am curious, if you buy someand If you have any Suzuki rubber velocity stacks can you post here if the stock GS stacks {34mm} fit the Mikuni 34mm carbs. I wish to use some sort of airbox or Tintops "antipod" and both need rubber stacks....

Mick

Leino · « **Reply #2 on:** March 14, 2011, 03:21:24 AM »

I'll take a look and let you know Mick.
However, I did use the same K&N filters in both, stock GS 34mm Mikuni's and the RS40's and they fit fine.

Juha

Retro Rocket · « **Reply #3 on:** March 14, 2011, 03:58:51 AM »

Ah, ok. If the K&N's work then i see no reason why the stock rubber stacks won't then......

Thanks mate...

Leino · « **Reply #4 on:** March 14, 2011, 04:01:39 AM »

Quote from: Retro Rocket on March 14, 2011, 03:58:51 AM

Ah, ok. If the K&N's work then i see no reason why the stock rubber stacks won't then......

Thanks mate...

That's what I thought too, no worries mate

mick7504 · « **Reply #5 on:** March 14, 2011, 04:09:52 AM »

Hi Juha

I have a set of these 34mm Mikunis on their way now with K&N's for the Billet Block Engine.

The TMR32's are still in my dreams at the moment, and while they'll be in my dreams for a while longer, these RS34's are very realistically priced.

I don't know what the setup is for adapting with the late model carb boots but I would assume that it's doable.
Mike or Ken would know.

Mick

Doctor_D · « **Reply #6 on:** March 14, 2011, 07:40:16 AM »

Not like I'm in the market for new carbs, but I'm as interested as anyone in a report on the RS34's and/or TM32's.

My CR's work well enough on the dyno, but an accelerator pump and a few more cfm's can't hurt.

dragracer · « **Reply #7 on:** March 14, 2011, 06:27:27 PM »

I've got a set of 36 Flatsides on my F" model and i love the performance. I drag race the bike only- no street riding though. 1030cc with an RC 327 cam on a ported F model head with stock valves.

http://www.newdayphoto.phanfare.com/5044525 Note the dial in. I ran quicker on the first run out of the trailer but dialed it up for first round of eliminations. The bike has run a best of 6.55 in the 1/8th mile when i was about 10lbs lighter and raced it weekly.

Leino · « **Reply #8 on:** March 16, 2011, 03:56:22 AM »

Quote from: mick7504 on March 14, 2011, 04:09:52 AM

Hi Juha

I have a set of these 34mm Mikunis on their way now with K&N's for the Billet Block Engine.

The TMR32's are still in my dreams at the moment, and while they'll be in my dreams for a while longer, these RS34's are very realistically priced.

I don't know what the setup is for adapting with the late model carb boots but I would assume that it's doable.
Mike or Ken would know.

Mick

Hi Mick.
I agree on the pricing, TMR's cost more than most cars I've ever had

Please post some pics when the carbs arrive.

Juha

Leino · « **Reply #9 on:** March 16, 2011, 04:05:18 AM »

Quote from: dragracer on March 14, 2011, 06:27:27 PM

I've got a set of 36 Flatsides on my F" model and i love the performance. I drag race the bike only- no street riding though. 1030cc with an RC 327 cam on a ported F model head with stock valves.

http://www.newdayphoto.phanfare.com/5044525 Note the dial in. I ran quicker on the first run out of the trailer but dialed it up for first round of eliminations. The bike has run a best of 6.55 in the 1/8th mile when i was about 10lbs lighter and raced it weekly.

That's one quick SOHC you got there. What did you use for carb boots?

Retro Rocket · « **Reply #10 on:** March 16, 2011, 04:08:52 AM »

Hi Juha, how about some pics of that Suzuki ...

Leino · « **Reply #11 on:** March 16, 2011, 04:13:41 AM »

Quote from: Retro Rocket on March 16, 2011, 04:08:52 AM

Hi Juha, how about some pics of that Suzuki ...

I don't mind posting them but there's a lot of people here who seem to like Honda's quite a lot

Ok, one picture

If you like some more pics, I can send some by PM.

turboguzzi · « **Reply #12 on:** March 16, 2011, 04:41:41 AM »

hei Juha

dont know how vintage drag racing is run, but in road racing, carbs have to follow the bike's period = no flat slides till 83'.... dont you have similar limitations in your class?

TG

mick7504 · « **Reply #13 on:** March 16, 2011, 04:45:22 AM »

Quote from: Leino on March 16, 2011, 03:56:22 AM

Quote from: mick7504 on March 14, 2011, 04:09:52 AM
Hi Juha

I have a set of these 34mm Mikunis on their way now with K&N's for the Billet Block Engine.

The TMR32's are still in my dreams at the moment, and while they'll be in my dreams for a while longer, these RS34's are very realistically priced.

I don't know what the setup is for adapting with the late model carb boots but I would assume that it's doable.
Mike or Ken would know.

Mick
Hi Mick.
I agree on the pricing, TMR's cost more than most cars I've ever had
Please post some pics when the carbs arrive.

Juha

No problem Juha
They should arrive within the next week or so and I'll get some photos up on here.
Mick

Leino · « **Reply #14 on:** March 16, 2011, 04:46:35 AM »

Quote from: turboguzzi on March 16, 2011, 04:41:41 AM

hei Juha

dont know how vintage drag racing is run, but in road racing, carbs have to follow the bike's period = no flat slides till 83'.... dont you have similar limitations in your class?

TG

Hi TG.
No limitations to carbs in Streetbike-class.
I wish there was vintage drag racing in Finland but no, I race against all the hi-tech guys

Juha

754 · « **Reply #15 on:** March 16, 2011, 08:40:50 AM »

Using the standard rule of thumb that 6.55 1/8 mile bike.. runs around 9.90 in the 1/4.. is that correct.. or at least Very low 10s../

Leino · « **Reply #16 on:** March 16, 2011, 12:22:44 PM »

My personal best so far has been 6.479 / 9.932 so your calculation must be close 754.

Juha

dragracer · « **Reply #17 on:** March 16, 2011, 08:39:39 PM »

Quote from: 754 on March 16, 2011, 08:40:50 AM

Using the standard rule of thumb that 6.55 1/8 mile bike.. runs around 9.90 in the 1/4.. is that correct.. or at least Very low 10s../

The best 1/4 mile time on the bike was a 10.58. The bike is geared primarily for 1/8th mile racing so its flat out by the time i reach the 1000 foot mark. Backhalf numbers are really terrible.

I think a 6.25 1/8th mile time equates to a 9.90 in the 1/4 mile.

754 · « **Reply #18 on:** March 16, 2011, 09:37:17 PM »

I know some bikes, really low geared ones can be way better in 1/8th than 1/4 mile.
But wayy way back when, I had a formula, maybe it worked better on 10 second & plus stuff..
Add half to the ET, and a 1/3 to MPH to get difference from 1/8 to 14 times..
maybe its more like 1.6 than 1.5.. but more often than not, it was eerily close...

dragracer · « **Reply #19 on:** March 17, 2011, 07:32:34 PM »

Quote from: Leino on March 16, 2011, 04:05:18 AM

Quote from: dragracer on March 14, 2011, 06:27:27 PM
I've got a set of 36 Flatsides on my F" model and i love the performance. I drag race the bike only- no street riding though. 1030cc with an RC 327 cam on a ported F model head with stock valves.

http://www.newdayphoto.phanfare.com/5044525 Note the dial in. I ran quicker on the first run out of the trailer but dialed it up for first round of eliminations. The bike has run a best of 6.55 in the 1/8th mile when i was about 10lbs lighter and raced it weekly.
That's one quick SOHC you got there. What did you use for carb boots?

I had F model boots from a 78 i think. The carbs i selected had very close spacing to the Honda's. They fit both FJ1100 Yammies and 85 Ninja 900's- Mikuni 36mm flatslides that i bought new. I had a stock set of CV's from the 900 that i wanted to use but they were so gummed up i quit with them and went with the new Mikunis. Because the spacing was so close yet the carb boots were a bit to small, i offset ground the boots (stone on a die grinder)to match the spacing of the carbs. I took a little more material off of whatever side of the boot i needed top match the rack of the carbs. It didn't take long as they were really close to begin with. The bike is very responsive with those carbs eventhough they are to big for the motor. I venture to say a set of 34's might have been best for my 1030cc motor.

voxonda · « **Reply #20 on:** March 26, 2011, 08:41:30 AM »

Got a set of 34's too, and want them on my F2 engine. Heard about using the rubber boots of a KZ(DOHC), anyone familiair with that? I know they are big, but like to try them. Hoping to open the engine to 850/900 soon, with a .370 cam. Currently 41a.

Rob.

edit: My mistake no RS34's but VM33's

MRieck · « **Reply #21 on:** March 26, 2011, 09:34:41 AM »

Quote from: voxonda on March 26, 2011, 08:41:30 AM

Got a set of 34's too, and want them on my F2 engine. Heard about using the rubber boots of a KZ(DOHC), anyone familiair with that? I know they are big, but like to try them. Hoping to open the engine to 850/900 soon, with a .370 cam. Currently 41a.

Rob.

The Z/KZ boots have a flange that bolts on to the head Rob

voxonda · « **Reply #22 on:** March 26, 2011, 09:55:03 AM »

Hey Mike,

Yes, the Kawi's have but not the Honda KZ 750 (DOHC)

Cheers, Rob

mick7504 · « **Reply #23 on:** April 04, 2011, 09:03:00 PM »

Here are some photos of the Mikunis that arrived yesterday.
I wasn't sure what I was going to use for the rubber manifolds on these as the spigots are 40mm.
I had a new set of Honda K rubbers which were tight to get on, but they have snapped on perfectly with a small amount of lube and some even downwards pressure.
Mick

Retro Rocket · « **Reply #24 on:** April 04, 2011, 10:03:38 PM »

Gday Mick, are there velocity stacks that suit the RS carbs .?

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Author Topic: Mikuni RS34's & CB 750 (Read 40517 times)