gsxr slingshots on gs1100 float height?, HELP!

[gsBert]

hi,

i need to know what your float height is measured from the gasket surface to the bottom of the float, with the carbs upside down and the float just touching the tip of the valve.

note that i need this info for a set or bs36ss carbs (the gsxr slingshots, semi-flatslide cv carbs) mounted on a gs 1150 or gs1100 engine.

the engine configuration does not allow the carbs to be tilted forward as on the gsxr, so i assume the stock gsxr float height will be wrong.

if you've been experimenting and have gotten these carbs to work on any of these 2 engines with a pipe, pods or even in stock form, let me know what your setup is please, im going crazy.

while youre at it, gimme all your jet sizes (pilot, main, needlejet), number of turns for the mix screws, and needle number (model) and clip position.

also, one of the 2 air holes at the bottom of each slide was epoxied over on my carbs, i'm told this is to compensate for the different engine stroke from the gsxr and the 1150, and was easier than messing with diaphragm spring rates. im really tempted to unclog those holes, should i?

[RacingJake]

I got the 38mm cv's and used a hose clamp on the frame under the tank to pull the carbs up as high as they could go until the petcock hits the top of the carb. I just kept lowering the floats until they stopped leaking out the back of the carbs. I don't used any filters just some cut down 7oz kids sipper cups as stacks and when I wack the throttle the slides go full open. My slide holes are not plugged, stock needles and pilot's just bigger mains. Since it's a dragbike I'm running 160's mains. I have'nt even touch any of the mixture screws. I also use one of those motorcycle filters about the size of a half dollar to keep all the crap out of the carbs.

[lecroy]

I don't used any filters just some cut down 7oz kids sipper cups as stacks

I would expect nothing less!!!!

[stiksave]

Bert,

Maybe this will help. http://www.mikuni.com/pdf/rs_app_parts_lists.pdf Let me know how you make out. I've got a set coming in from e-bay that I want to try.

Chris

[gsBert]

i got a set of rs36 flatslides on the other 1150 (the red one that's for sale). nice carbs, but i want to get my slingshots to work...

the slingshots will give smoother delivery and compensate for user errors.

the mechanical slide carbs (RS) are very sensitive to throttle and you have to be smooth when opening the throttle up (get a feel for revs and engine loads), if you just whack it open at teh wrong rpm/load, youll just drown your engine with way too much fuel.

do not ever forget that these carbs have an acceleration pump, so never ever twist the throttle when the engine is off ok???!!!
some !@##!@ kid did this to my bike while it was parked, i almost drained my battery trying to start the engine... (super flooded i tell ya)

i really like cv carbs, they compensate for altitude/temperature/engine load, and if you want to go fast, just whack it open and let the diaphragms do their thing...

the RS are easier to jet and tune as your brain provides the computing for throttle position, but while they do give more power in the right hands, i find they act too much like an on/off switch for street use (i'll never ever drive the red 1150 in the rain again, the blasted thing goes sideways when you try to pass someone) and they are tiring on the right hand for long tours...

also, i find power delivery to be a bit unpredictable with them (might be the other engine mods in combination), i never know what will happen when i open up the throttle, it's very interesting, sometimes it'll wheelie, sometimes it'll spin the rear tire, and sometimes it'll just bog down...
all from the same speed at the same load same temperature and same rpm on the same road... 4th and 5th gear are ok though unless youre going over 100mph then the power gets twitchy again...

if you're a power-junkie, you'll love the rs carbs though, hope you got a good deal on them... and you do get used to them, going back to a cv carb feels safe and slightly slushy...

back to my slingshots:
i finally got the bike to run!!!
i replaced the pipe with the 4:1 off my 750 (took some hammering but it fit, the supertrapp header will require some machining but is going on this winter)
i also drilled those slide holes (the ones that were epoxied shut) after flow benching the carbs using my vacuum cleaner.

the bike used to run super rich (too much backpressure combined with the slides raising too fast and staying up too long). the slides now follow the butterflies nicely.

im now running too lean on the needle jet but the needle is adjusted at the lowest position ill raise it 2 notches tomorrow (by lowering the e-clip).
i havent been able to do a plug chop at full throttle, i ran out of balls and road, but ill go on a dyno for that....

if im still runnign too lean, ill lower the float height (measured with the carb upside down) when i have the needle all the way up, but i should not need to, im in the ballpark...

[stiksave]

Bert,


I Paid $31.00 plus shipping. They are 36mm RS carbs. I was going to try them on MY 1100, 4 X 1, pods. Any info on your settings in general, or just try them how they sit? To me the cv carbs seem too high maintenance, just my opinion. Probably because I'm still learning. Anyway, I just got a new set of intake boots from my dealer, he loves me $39.50 with tax. Old guy discount I guess. I didn't want to play with the carbs without new boots. If these set level like the cv's, I can use the settings from Mikuni pdf, probably for the gsx-r1100.

Thanks,
Chris

[gsBert]

31$????

it's my understanding that these carbs sell for 1000$ and sometimes more....

build some sort of bracket to hold them in place. or you can ziptie from the frame...

they tilt downward, dont leave the petcock on prime, lol youll flood your engine

[stiksave]

http://www.thegsresources.com/_forum/viewtopic.php?t=41750&highlight=

[Billy Ricks]

Those are stock CV type carbs. They are probably flatslide CVs, but they aren't RS flatslides. Float height is generally around 21mm for most Mikuni CV type carbs.

[gsBert]

sorry dude, those are NOT rs-36 carbs...

the diaphragm cover should have given them away immediately...

the 31$ price couldve also given it away. i saw a set for sale for 1500$ us once...

[RacingJake]

34 to 40RS are between 559 to 599 new.

[moto_dan]

Some additional info
http://www.mikunioz.com/rs_kits.htm

[Billy Ricks]

Some of the Yoshimura modified RS carbs could have run $1500 or more. They used special slides and some of the really serious carbs had the slides riding on needle bearings. I know on the AMA Supersport bikes of the early '90s Yosh was running hollow jet needles with fuel nozzles up and down the needles. As the slides rose more nozzles were exposed. These were for CV carbs but they may have been using the needles in the racing flatslides as well.

[stiksave]

OK, so I made a testicle out of myself. The stock carbs on my 83 1100E have round slides. Are they also cv carbs. What threw me was the slides, they are exactly like the radial flatslides on the RS model. So, getting back to these, can they be set up for my 1100? Will I get any better performance? Put them back on E-Bay? Stop buying stuff?

Thanks,
Chris

[Billy Ricks]

They can be set up for your bike with a little work. If it doesn't already have a jet kit installed contact Dynojet by phone and tell them what you're doing. Chances are they can point you in the right direction and supply you with a kit that will work.