Thread: bigger carbs = more rpms
07-11-2007, 10:47 PM #1
bigger carbs = more rpms
I've been at this for a while on my ski trying to properly jet gp1200 carbs on my raider.
I got a chance to throw my PET2100 on a stock raider over the weekend. It was spinning 6500+/-
I was testing a stock prop on my ski witch is almost perfectly jetted(just need to lower popoff, I think) and it was turning 6800+
So there you have it, roughly 300 rpm's when you throw 44's off a gp1200 onto a raider 1100.
07-12-2007, 08:19 AM #2
the only thing you need now is a larger fuel tank.....along with the increase in rpms you'll see an increase in fuel consumption....also a whole lot more smiling.
07-12-2007, 09:09 AM #3
TJ, says that 48s are 7 hp better than 46s on a ported 1200.
07-12-2007, 09:33 AM #4
I have always experienced good results with the larger carbs. Even put 48s on a stock 1200 and picked up everywhere.
07-12-2007, 06:21 PM #5
the 1100 fuel supply line is smaller diam.
I hooked up to both reserve and the "on" line and tee'd into the carb fuel lines between the carbs..also ran a restrictor jet.
07-12-2007, 06:37 PM #6
What I did was run a gp1200 selector switch. It is .5mm larger ID than a 1100 selector. Stock routing, filter, ect. Actually have too much gas. Running. . . 110pilots and 100 mains. VF3's, stock bore, comp, ect. 1200 cdi.
07-12-2007, 06:40 PM #7
stock 44 carbs or Buckshot 44 carbs
Plus your reeds would account for some rpm over stock.
07-12-2007, 07:21 PM #8
stock 65u carbs. vf3's i'm sure are helping. I've rejetted alot, and each time gain rpm's. once I am happy with the jetting i will try to do a back to back on the stock vs vf3's. I am curious. . . I can tell you that they are screwing with my jetting, and that the midrange hit is unvelieveable!!!
07-14-2007, 03:55 AM #9
Great info here....>> I`m following along, as I am planning a carb upgrade......
07-15-2007, 09:54 PM #10
After playing with popoff and needles, rpm's are up to 6950 on a stock prop 61.5mph before it started bouncing uncontrollably. I have some shimming to do. . .
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