[Fot] Stutter at 4K rpm

[Bill]

Your weber floats might be partially full of gas. Makes the float level unstable. 


> On Oct 15, 2016, at 10:30 AM, D V <explore8 at outlook.com> wrote:
> 
> Two races ago I went off track and bent my exhaust pipe enough to break the welded joint near the muffler. In the interest of time, I cut the exhaust at the muffler and secured the pipe to the frame.
> 
> At the last race, I noticed the car would backfire at deceleration which I am not surprised but I also noticed a stutter around 4-5k rpm. 
> 
> At NOLA this weekend it is more pronounced and comes in when shifting hard from 3rd to 4th. After 5k, it clears up and pulls normally.
> 
> It doesn't seem to be affected by turns and more related to full throttle vs easing into the gas.
> 
> Backpressure from the loss of muffler or unrelated issues?
> 
> 1300 spitfire with single Weber 40.
> 
> Sent from my iPhone
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