jensvonbustenskjold Posted January 20, 2022 Posted January 20, 2022 Hi all, Question, Has anyone used RS-D21-K for a GS1000? Got a 81 model with 34mm inlet. I see in the Mikuni manual that they recommend RS36-D3-K for GS1000. I've got a set of new 34mm inlet. Are they soft enough to push the 36mm into? Stock engine. Any takers, cheers Quote
Gixer1460 Posted January 20, 2022 Posted January 20, 2022 No reason not to use 34's - remember these recommendations are based on racing applications where outright performance is key! If the rubbers are new then they should accommodate some 36's but be prepared for skinned knuckles and use of ratchet straps ! The 34's may make for a better road bike ie good torque and mid range with a little loss at top end which is rarely used anyway! 1 Quote
jensvonbustenskjold Posted January 20, 2022 Author Posted January 20, 2022 My thoughts exactly! Thank you @Gixer1460, I really needed to hear that in my insecure brain 1 Quote
TonyGee Posted January 20, 2022 Posted January 20, 2022 yeah if its for road use I'd go for 34mm. 1 Quote
jensvonbustenskjold Posted January 20, 2022 Author Posted January 20, 2022 Would you go for 120 main jet with K&N pods? Since the manual states 120? Quote
Gixer1460 Posted January 20, 2022 Posted January 20, 2022 Start at 120 but you'll probably go smaller - Smaller dia carb means increased air speed through it, so increased airspeed through the venturi means lower pressure = better draw on the jet = it'll be richer than if carb was a 36mm with a 120. 2 Quote
agemax Posted January 30, 2022 Posted January 30, 2022 Sorry to hijack the thread but i too am planning on fitting a set of RS34's. I have a head from a 81 GS1000G so it has the bigger inlet ports but what inlet rubbers do i need to get for the RS34's? Is it standard GS1000 rubbers or from something different? TIA 1 Quote
Mike711 Posted January 31, 2022 Posted January 31, 2022 I have RS34s on a std 1100ET engine & it runs beautifully. 1 Quote
jensvonbustenskjold Posted January 31, 2022 Author Posted January 31, 2022 21 hours ago, agemax said: Sorry to hijack the thread but i too am planning on fitting a set of RS34's. I have a head from a 81 GS1000G so it has the bigger inlet ports but what inlet rubbers do i need to get for the RS34's? Is it standard GS1000 rubbers or from something different? TIA I'm aiming for original inlet Quote
wraith Posted January 31, 2022 Posted January 31, 2022 Was speaking to a well known bike tuner once and he told me that anything bigger than a 35mm carb is wasted on a CV or slide carb head gs1000 as they are to big to get the best out of the engine and carbs. 1 Quote
Ole Posted January 31, 2022 Posted January 31, 2022 The RS 34`s goes with the inlets from 34cv carbs. Done that back in 88 2 Quote
Gixer1460 Posted February 1, 2022 Posted February 1, 2022 17 hours ago, wraith said: Was speaking to a well known bike tuner once and he told me that anything bigger than a 35mm carb is wasted on a CV or slide carb head gs1000 as they are to big to get the best out of the engine and carbs. Possibly, but throw a 1085 or 1135 kit at it with RS36's and it'll wake right up . . . . . who builds std. GS1000's anyway 2 Quote
wraith Posted February 1, 2022 Posted February 1, 2022 5 hours ago, Gixer1460 said: Possibly, but throw a 1085 or 1135 kit at it with RS36's and it'll wake right up . . . . . who builds std. GS1000's anyway My comment was just for a GS 1000 bord to 1085 or 1100cc don't know about a gsx or bigger bore than a gs1100 and if you went any bigger than a 1100cc bore on a GS motor you really need to start looking at bigger values to get the most out of the bigger bore, you then maybe ok to go for a 36mm + carbs on a gs1000. Just repeating what Roger Upton told me when he was doing a motor for me. 1 Quote
TonyGee Posted February 1, 2022 Posted February 1, 2022 6 hours ago, Gixer1460 said: who builds std. GS1000's anyway plenty of people, I bet theirs more standard GS1000's on the roads than tuned ones. 1 Quote
Gixer1460 Posted February 1, 2022 Posted February 1, 2022 3 minutes ago, TonyGee said: plenty of people, I bet theirs more standard GS1000's on the roads than tuned ones. Tongue in Cheek remark, sarcasm ! ! ! Besides RS34's ain't standard are they! LOL! Quote
wraith Posted February 1, 2022 Posted February 1, 2022 Anyway, if he's running a stock gs1000 the RS34mm will be ample the 36mm will be to big for stock motor. Quote
Dezza Posted February 1, 2022 Posted February 1, 2022 Who builds stock GS1000s? Err, members of the SOC? Good luck to them, I say. A stock classic Jap machine is infinitely more interesting than almost any modern (road) bike 3 Quote
cnap504 Posted February 2, 2022 Posted February 2, 2022 (edited) On 1/20/2022 at 2:47 AM, jensvonbustenskjold said: Hi all, Question, Has anyone used RS-D21-K for a GS1000? Got a 81 model with 34mm inlet. I see in the Mikuni manual that they recommend RS36-D3-K for GS1000. I've got a set of new 34mm inlet. Are they soft enough to push the 36mm into? Stock engine. Any takers, cheers Have you bought any carbs yet? If the motor is going to remain basically stock, 31mm Keihin round slide CR Specials just might hit the sweet spot. 5mm’s larger than the stock 26’s, they’ll boost top end without giving up low end. A bit pricey tho Edited February 2, 2022 by cnap504 Quote
jensvonbustenskjold Posted February 2, 2022 Author Posted February 2, 2022 16 hours ago, cnap504 said: Have you bought any carbs yet? If the motor is going to remain basically stock, 31mm Keihin round slide CR Specials just might hit the sweet spot. 5mm’s larger than the stock 26’s, they’ll boost top end without giving up low end. A bit pricey tho I did. Waiting for the postal service. I looked at Keihlin, but it was quite expensive compared with mikuni 1 Quote
wraith Posted February 2, 2022 Posted February 2, 2022 Had a set of 35mm CR carbs on my old gs1000 board out to 1148cc and boy did it shift, but a pain to set up. 2 Quote
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