Planet Minis

frdvschvy · 06-21-2005, 04:31 PM

I have a couple different 24mm carbs that I am looking at purchasing. I know some of the newer big bikes run flat slide carbs. What are some of the biggest advantages or disadvantages of a flat slide carb vs. round slide?

3rdGearPinned · 06-21-2005, 04:58 PM

flat slides are usually harder to tune, but make more power when tuned right.

Thats all i really know lol.

Motarded · 06-21-2005, 05:07 PM

I always wonder why people say they are harder to tune! LAZIES!

frdvschvy · 06-21-2005, 05:41 PM

Yeah, I don't mind spending some time tuning the thing. I am just curious if one offers better perfomance than the other.

Pinky · 06-21-2005, 08:41 PM

flatslide look cooler

I actually dont know if there is a performance gain since the only time Ive converted to a flatslide I also went up in size, so I dont know what just going to a flatslide would do. but since basically all big bikes that are carbuerated use flatslides, there has to be a good reason.

Pimpindahoes · 06-21-2005, 08:47 PM

doesnt a flat slide give it more of a 2 stroke characteristics? and the round slide more liek a 4 stroke???

the whole heart of the power band difference of the two????

3rdGearPinned · 06-21-2005, 08:49 PM

Are there any 26mm flatslide carbs out there for the 50s?

Like classic honda only sells a 24mm flatslide

imported_Kurlon · 06-21-2005, 09:05 PM

http://www.sudco.com/mikuni3.html

Mikuni has 24 and 28mm units, no 26's listed that I saw.

3rdGearPinned · 06-21-2005, 09:10 PM

Why did they have to skip 26mm?

imported_Kurlon · 06-21-2005, 09:25 PM

Dunno, looks like Kehin does the same thing.

cyclerider57 · 06-21-2005, 11:31 PM

Flat slides are known to be higher performance because there is less area in the slide region of the carb. The air can get across the slide quicker allowing for increased air flow earlier.

Pimpindahoes · 06-22-2005, 12:53 AM

thanks cr57.....

i was taking a stab at it.......wasnt sure myself...

Motarded · 06-22-2005, 03:01 AM

MINIGUNZ Sells a 26mm Flat Slide Carburetor that we have been testing with GREAT success!

imported_WFOfromthegetgo · 06-22-2005, 07:35 AM

flatsides will usually make more power at WOT but are a little trickier to get right at smaller throttle openings. A round slide will feel a bit smoother as far as power delivery goes but you will make more power with a flatside. If you're usually going full out and you're OK with a little jerkiness donw low (you might not even feel it) then go with the flatsides.

that's what I found on all my streetbikes anyway...

plus flatsides look way cooler and rattle at idle which sounds way cooler

Pimpindahoes · 06-22-2005, 08:57 AM

yea thats pretty much what i was talking about with my first post.....

but using a stroke power band compared to a 4 strokes........

2 strokes power is at the top and the 4 strokes power is at low to mid....

thats kinda how this is, right?

2 stroke = flat slide
4 stroke = round slide

imported_Kurlon · 06-22-2005, 09:20 AM

Depends entirely on the motor.

Build a way oversquare 4 stroke, big ports, overcarb it, and you'll have a mill that screams up top, has a bottom end thats useless, and a midrange that hurts to crawl up through.

Build a stroker two stroke, small carb, powervalve or equivilent in the exhaust, and you've got a bike with good bottom and mid but a lackluster finish up top.

In theory the flat slide should give better throttle response. The difficulty comes in sizing it, getting the right shape slide cutout, and needle profile. Most small flat slide 'performance' carbs have slides and needles geared for two stroke motors out of the box. Other slides and needles are available, but most people don't bother.

Some digging shows Dellorto makes a 26mm flatslide, the VHB series. Dunno who imports them in the states though.

06-21-2005, 04:31 PM	#1 (permalink)
frdvschvy 2nd Gear Member Join Date: Aug 2004 Location: Corona Posts: 494	Flat slide vs. Round slide carb??? I have a couple different 24mm carbs that I am looking at purchasing. I know some of the newer big bikes run flat slide carbs. What are some of the biggest advantages or disadvantages of a flat slide carb vs. round slide?

06-21-2005, 11:31 PM	#11 (permalink)
cyclerider57 Got Un-disappeared Join Date: Nov 2003 Location: Kansas Posts: 4,329 My Mood:	Flat slides are known to be higher performance because there is less area in the slide region of the carb. The air can get across the slide quicker allowing for increased air flow earlier. __________________ The wise understand by themselves; fools follow the reports of others. Goodness speaks in a whisper, evil shouts. -Tibetan Proverb

06-21-2005, 04:58 PM	#2 (permalink)
3rdGearPinned 3rd Gear Member Join Date: Dec 2003 Location: Annapolis, MD Posts: 5,971	flat slides are usually harder to tune, but make more power when tuned right. Thats all i really know lol.

06-21-2005, 05:07 PM	#3 (permalink)
Motarded 3rd Gear Member Join Date: Aug 2004 Location: RIVERCIDE SO CAL 951 Posts: 4,977	I always wonder why people say they are harder to tune! LAZIES!

06-21-2005, 05:41 PM	#4 (permalink)
frdvschvy 2nd Gear Member Join Date: Aug 2004 Location: Corona Posts: 494	Yeah, I don't mind spending some time tuning the thing. I am just curious if one offers better perfomance than the other.

06-21-2005, 08:41 PM	#5 (permalink)
Pinky 2nd Gear Member Join Date: May 2005 Posts: 689	flatslide look cooler I actually dont know if there is a performance gain since the only time Ive converted to a flatslide I also went up in size, so I dont know what just going to a flatslide would do. but since basically all big bikes that are carbuerated use flatslides, there has to be a good reason.

06-21-2005, 08:47 PM	#6 (permalink)
Pimpindahoes 3rd Gear Member Join Date: Apr 2004 Location: Ontario, California Posts: 8,338 My Mood:	doesnt a flat slide give it more of a 2 stroke characteristics? and the round slide more liek a 4 stroke??? the whole heart of the power band difference of the two????

06-21-2005, 08:49 PM	#7 (permalink)
3rdGearPinned 3rd Gear Member Join Date: Dec 2003 Location: Annapolis, MD Posts: 5,971	Are there any 26mm flatslide carbs out there for the 50s? Like classic honda only sells a 24mm flatslide

06-21-2005, 09:05 PM	#8 (permalink)
imported_Kurlon 2nd Gear Member Join Date: Feb 2005 Location: Windham, ME Posts: 608	http://www.sudco.com/mikuni3.html Mikuni has 24 and 28mm units, no 26's listed that I saw.

06-21-2005, 09:10 PM	#9 (permalink)
3rdGearPinned 3rd Gear Member Join Date: Dec 2003 Location: Annapolis, MD Posts: 5,971	Why did they have to skip 26mm?

06-21-2005, 09:25 PM	#10 (permalink)
imported_Kurlon 2nd Gear Member Join Date: Feb 2005 Location: Windham, ME Posts: 608	Dunno, looks like Kehin does the same thing.

06-22-2005, 12:53 AM	#12 (permalink)
Pimpindahoes 3rd Gear Member Join Date: Apr 2004 Location: Ontario, California Posts: 8,338 My Mood:	thanks cr57..... i was taking a stab at it.......wasnt sure myself...

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

06-22-2005, 03:01 AM	#13 (permalink)
Motarded 3rd Gear Member Join Date: Aug 2004 Location: RIVERCIDE SO CAL 951 Posts: 4,977	MINIGUNZ Sells a 26mm Flat Slide Carburetor that we have been testing with GREAT success!

06-22-2005, 07:35 AM	#14 (permalink)
imported_WFOfromthegetgo PM Newbie Join Date: May 2005 Location: Toronto, Canada Posts: 97	flatsides will usually make more power at WOT but are a little trickier to get right at smaller throttle openings. A round slide will feel a bit smoother as far as power delivery goes but you will make more power with a flatside. If you're usually going full out and you're OK with a little jerkiness donw low (you might not even feel it) then go with the flatsides. that's what I found on all my streetbikes anyway... plus flatsides look way cooler and rattle at idle which sounds way cooler

06-22-2005, 08:57 AM	#15 (permalink)
Pimpindahoes 3rd Gear Member Join Date: Apr 2004 Location: Ontario, California Posts: 8,338 My Mood:	yea thats pretty much what i was talking about with my first post..... but using a stroke power band compared to a 4 strokes........ 2 strokes power is at the top and the 4 strokes power is at low to mid.... thats kinda how this is, right? 2 stroke = flat slide 4 stroke = round slide

06-22-2005, 09:20 AM	#16 (permalink)
imported_Kurlon 2nd Gear Member Join Date: Feb 2005 Location: Windham, ME Posts: 608	Depends entirely on the motor. Build a way oversquare 4 stroke, big ports, overcarb it, and you'll have a mill that screams up top, has a bottom end thats useless, and a midrange that hurts to crawl up through. Build a stroker two stroke, small carb, powervalve or equivilent in the exhaust, and you've got a bike with good bottom and mid but a lackluster finish up top. In theory the flat slide should give better throttle response. The difficulty comes in sizing it, getting the right shape slide cutout, and needle profile. Most small flat slide 'performance' carbs have slides and needles geared for two stroke motors out of the box. Other slides and needles are available, but most people don't bother. Some digging shows Dellorto makes a 26mm flatslide, the VHB series. Dunno who imports them in the states though.