Smooth Bore Carbs staying open how to get them to close faster

[IronPawz]

Sounds like preloading the spring as per sidecar Bob's patented method is one option, finding a longer spring another or your mechanic may have a better answer.

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Yeah longer spring makes sense. I've not been able to google anything useful but the mechanic is smart and well hooked up so I'm sure if he needs to he will be asking about the community. Any open day I come home from with the bike in one bit is a winner so either way I'm going and will just try ride accordingly.

[IronPawz]

I've the 92 Gixxer for the next track days. Nut for steering head his on order, got a race battery for it last week. That bike I'll try going nuts on, get some stickies and potentially bin it. I really do not want to drop the Kat that ideally will be a daily long distance ride. So having the carbies shut off is important to me. I can see people dealing with it on the track (get on the breaks) but it would be rubbish on the daily so it needs to get sorted out of I'd have to put the standard carbs back (where is the fun in that).

[jellywrestler]

Smoother than a porn stars sniz?

smoothbores is a term referring to the inside of the carb layout, not the outside....., a lot of people refer to all slide carbs (as opposed to CV ones) as smoothbores.
is there any facility for a return cable from the handlebars?

[jasonu]

Sidecarbob was on about something like what you ask.

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That cunt...


Sorry mate I couldn't resist.

[Grumph]

smoothbores is a term referring to the inside of the carb layout, not the outside....., a lot of people refer to all slide carbs (as opposed to CV ones) as smoothbores.
is there any facility for a return cable from the handlebars?

The pics I've seen certainly looked like Mikuni 33 smoothbores. There will not be any internal springs for throttle return - they're all on the external linkage.
There are a couple of alternative spring anchor positions, someone may have backed off the return spring tension to get a lighter action.
The correct fix is as jelly says a return cable - there should be provision on the linkage for one.
The 33's don't have a rep for vacuum sticking - certainly not like the early RS flatslides.

[jasonu]

The pics I've seen certainly looked like Mikuni 33 smoothbores. There will not be any internal springs for throttle return - they're all on the external linkage.
There are a couple of alternative spring anchor positions, someone may have backed off the return spring tension to get a lighter action.
The correct fix is as jelly says a return cable - there should be provision on the linkage for one.
The 33's don't have a rep for vacuum sticking - certainly not like the early RS flatslides.

Do whatever this guy says. He knows what he is talking about!!!

[IronPawz]

The pics I've seen certainly looked like Mikuni 33 smoothbores. There will not be any internal springs for throttle return - they're all on the external linkage.
There are a couple of alternative spring anchor positions, someone may have backed off the return spring tension to get a lighter action.
The correct fix is as jelly says a return cable - there should be provision on the linkage for one.
The 33's don't have a rep for vacuum sticking - certainly not like the early RS flatslides.

Nice thanks very helpful. It is in with the man and I've passed him this thread. I will go through it again in detail and try get some schematics etc to get a handle on it.

[Katman]

The correct fix is as jelly says a return cable - there should be provision on the linkage for one.

Trouble is, if it's running the original switchblock and throttle grip it won't have provision for a return cable. (Even if there is down at the carb end).

[IronPawz]

I rode this bike in this morning to get it started for certification. With fresh gas it stopped all forms of hesitation with mild roll on (I never really opened it up mind low profile ride). No issue in the shut off not under power so that is good (it is road ride able). Idle is a bit lumpy but it is ok. After riding the standard Kat most of last week and yesterday this bike is fantastic in terms of power from down low, ride comfort, handling, breaking all so much better.

The throttle is really heavy is my only issue. So mechanic is looking at that as part of the mix (saw wrist just holding it at road speeds and I ride 10+ hours a week, the old Kat was ok on the wrist). I wonder if some riding (given it sat a long time) will also free this up. The owner did mention it happens (sticks open, known for the carb and get on the breaks). He also mentioned it was never fully tuned but it was rebuilt and only did around 1500kms from the build of the bike in general.

So mechanic / builder is looking to soften the throttle and improve the return. I can confirm the clippons are setup for push pull but looking there the carbs do not cater for this. Bike made me smile the whole ride and I might have failed to resist the detour over Paekakariki. The front wheel is so pointy it was trying to steer in (under gentle riding). I was wondering why when the mechanic pointed out the tire.

Grateful for all comments here, I'll be taking those details to google also and trying to understand it better. I trust these are smoothies based on the engineer that created the bike and his thread and character (good decent guy has a wire wheel Kat sitting in the shed along with a sweet 90's GSXR1100) he builds Bink carbs from scratch so I trust his skills. Still if there is anything better images I can put up I will (bike in shop probably till Wednesday now).

[Katman]

The throttle is really heavy is my only issue.

That's slide carbs for you.

[Grumph]

The throttle is really heavy is my only issue.

You may have a quick action throttle if there's provision there for a return cable. That does make them heavy. They're not usually bad, have a look at the cable for kinks.

If there's no provision on the carb bank then someone's cut it off. The bits are available.

Not exactly IronPawz are you....That's a mans bike you've got.

[jellywrestler]

Not exactly IronPawz are you....That's a mans bike you've got.

that's what the women up there call him after he did community service ironing their clothes.....

[IronPawz]

That's slide carbs for you.

Fly by wire conversion? On a standard carb it would seem simpler than fuel injection.

Are there ways to make is easier generally? I like those carbs but I'm not sure I could really live with it all week they are really heavy. Even then they don't shut off. Am I hoping to much for something that is essentially a racing setup..

[IronPawz]

You may have a quick action throttle if there's provision there for a return cable. That does make them heavy. They're not usually bad, have a look at the cable for kinks.

If there's no provision on the carb bank then someone's cut it off. The bits are available.

Not exactly IronPawz are you....That's a mans bike you've got.

You might say so but I ride about 70 minutes each way twice a day five times a week, rain - hail - shine - winter / summer etc, and then I do every track day available from Taupo and Manfield and then I get out on some pretty epic rides with friends or visiting family. I'm no weekend around the bays type.

Maybe I should change it to iron arse limp wrist but it seems a lot of typing. I'm past 30 and by the end of a long week (especially if the weekend has rides) I have limits. So I want to bend a 'real man's bike' into a heavy commuter that is going to take some mods.

[IronPawz]

You may have a quick action throttle if there's provision there for a return cable. That does make them heavy. They're not usually bad, have a look at the cable for kinks.

If there's no provision on the carb bank then someone's cut it off. The bits are available.

Not exactly IronPawz are you....That's a mans bike you've got.

Good point on the cable mechanic is checking it all over. It is 1/4 turn so maybe that can be changed. I think the clippons etc are all early GSX-R. My daily ride currently is a CBR1000RR so I'm use to sports bikes but that is pretty mild on the wrist and also 1/4 turn.

I'll ask about the return cable I know they are there on the bars but not sure if attached.