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gs1000 - what carbs?

  • Thread starter Thread starter runrx02
  • Start date Start date
R

runrx02

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I'm in the getting parts together to build up my gs1000 motor. Was planning on getting some good cams, port and polish, larger valves, 1100cc kit, weld crank... usual stuff.
My guestion is what size Mikunis should I get with this combo, 36 38 or 40mm?
Or should I go Keihin?

Thanks
 
I'm not an expert, but my guess would be some 29mm smoothebores because of the intake port/boot size. If you want to go bigger get a head from an 1100G, it already has larger valves and bigger ports.
 
On my gs1100 with an 1166 kit I ran 36 and 38 mikuni flat slides. The 38's made more power, but there was some ridability issues. Not as responsive. When I was running my 1100 with stock pistons, head, and cams the 36's acted the same way. I always thought 34's would be perfect for the stock motor. Not sure how this translates to your 1000, but thought I would post up.
 
I have a similar set up to what you're proposing (1085 wiseco, welded crank, Kent cams, flowed head, Eagle pipe) and find the RS36's perfect.

I get 114 bhp at the wheel with no filters, but run a jet size down and with K&N's get 110bhp. The bike is perfectly driveable round town, pulls hard all the way, no holes anywhere, but screams like a banshee above 5500rpm.

Best bit? The carbs were plug and play. Fitted straight from the box and were perfect, other than going down a main jet size when fitting filters.

I've had it like this now for 4 years with no probs. :-D
 
I'm tearing down the carbs for my '80 GS1000G (BS34SS Mikunis). I'm having a hell of a time getting the air screws out, and one of the carbs (so far) has a broken post for the float pivot pin. Buying a spare or new set of carbs is an increasingly appealing option, but BS34SSes don't seem to be easy to find (at least not at a reasonable price, or in better shape than what I've already got). I'd also like to get carbs that have the air screws facing down, so they don't collect so much dirt and crud. The bike is otherwise stock, so what are my options? Would I need to use different carb boots, or get rid of the airbox and use individual pods if I used carbs from a different bike?
 
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