<html><body><div style="font-family: Arial; font-size: 12pt; color: #000000"><div aria-label="Compose body">May be time to look at the accelerator pump. My brother had a similar issue with his 40 IDF's. He WAS using gas with ethanol</div><div aria-label="Compose body">and it was leaving crusty deposits in the carbs every race & now buys non-ethanol ( av-gas ).</div><div aria-label="Compose body">jim g</div><div><br></div><hr id="zwchr"><div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;" data-mce-style="color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><b>From: </b>"D V" <explore8@outlook.com><br><b>To: </b>"Scott Barr" <sbarr@McCarty-Law.com>, "fot" <fot@autox.team.net><br><b>Sent: </b>Sunday, October 16, 2016 9:14:15 PM<br><b>Subject: </b>Re: [Fot] Fwd: Stutter at 4K rpm<br><div><br></div>Thanks again everyone. I checked the header to head and the exhaust to header connection and everything seemed tight. However I went 2 off hard at turn 4 this morning and my strap that was holding the exhaust is now mostly gone. I never figured out that 180 degree off camber turn all weekend.<br><div><br></div>To answer Scott's question, yes. I can brake downshift to 3rd in a turn. Full on the gas out of the turn and it stutters between 4-5k. If I do the same and ease into the gas I can most of the time keep it steady.<br><div><br></div>Re working the exhaust system as well as checking the float will be added to my winter maintenance. <br><div><br></div>Sent from my iPhone<br><div><br></div>> On Oct 16, 2016, at 2:21 PM, Barr, Scott <sbarr@McCarty-Law.com> wrote:<br>> <br>> Is it temporary? Just as you get on the gas out of a corner and then clears up as the revs rise?<br>> <br>> If so, do you have no oil in your dashpots or have you removed the dashpot pistons?<br>> <br>> Scott (B.)<br>> <br>> <br>> <br>> <br>> <br>> -------- Original message --------<br>> From: D V <explore8@outlook.com><br>> Date: 10/16/16 12:53 AM (GMT-06:00)<br>> To: Greg Blake <gblake58tr3@icloud.com>, fot@autox.team.net<br>> Subject: Re: [Fot] Fwd: Stutter at 4K rpm<br>> <br>> Thanks everyone for the replies. I will inspect the pipe to manifold and manifold to head to see if anything is loose or any leaks apparent in the morning.<br>> <br>> I actually went down a main jet 145 to 140 and that seemed like it helped some but didn't clear up the issue (which is going leaner; opposite of what Greg said).<br>> <br>> It is missing and backfiring when I am full on the gas. I can prevent it by easing into the gas.<br>> <br>> I did notice some gas at my air cleaner to velocity stack connection. I wonder if it is a float issue?<br>> <br>> <br>> Sent from my iPhone<br>> <br>> On Oct 15, 2016, at 7:35 PM, Greg Blake <gblake58tr3@icloud.com<mailto:gblake58tr3@icloud.com>> wrote:<br>> <br>> Don't know if my other email made it to you. Backfires on deceleration can be a lean condition. Have you checked your plugs? Maybe something got "adjusted" with the bump.<br>> <br>> Sent from my iPhone<br>> <br>> On Oct 15, 2016, at 12:27 PM, D V <explore8@outlook.com<mailto:explore8@outlook.com>> wrote:<br>> <br>> <br>> <br>> Sent from my iPhone<br>> <br>> Begin forwarded message:<br>> <br>> From: <explore8@outlook.com<mailto:explore8@outlook.com>><br>> Date: October 15, 2016 at 10:30:51 AM CDT<br>> To: <fot@autox.team.net<mailto:fot@autox.team.net>><br>> Subject: Stutter at 4K rpm<br>> <br>> 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.<br>> <br>> 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.<br>> <br>> 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.<br>> <br>> It doesn't seem to be affected by turns and more related to full throttle vs easing into the gas.<br>> <br>> Backpressure from the loss of muffler or unrelated issues?<br>> <br>> 1300 spitfire with single Weber 40.<br>> <br>> Sent from my iPhone<br>> _______________________________________________<br>> fot@autox.team.net<mailto:fot@autox.team.net><br>> <br>> http://www.fot-racing.com<br>> <br>> Donate: http://www.team.net/donate.html<br>> Archive: http://www.team.net/archive<br>> Forums: http://www.team.net/forums<br>> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/gblake58tr3@icloud.com<br>> <br>> <br>_______________________________________________<br>fot@autox.team.net<br><div><br></div>http://www.fot-racing.com<br><div><br></div>Donate: http://www.team.net/donate.html<br>Archive: http://www.team.net/archive<br>Forums: http://www.team.net/forums<br>Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/toodamnfunky@comcast.net<br><div><br></div><br></div><div><br></div></div></body></html>