Ok, now that you explained the differences I can now realize that Im running rich instead of lean. So after I check this header seal. Im going to put the stock 45 pilot jet back in and put my needle clip back to the standard 3 groove instead of the 5th.Afterfire is common in over rich conditions or re-ignition situations where there is too much fuel in the exhaust. It can also happen if the valves are hanging, or too tight. The combustion chamber literally is open to the exhaust through the hanging valve that was supposed to be shut.
Back fires are common in lean situations as the over-stoichometric fuel condition can burst quickly back through the open intake valve that is feeding the hot cylinder.
-BIG DAN
Popping on decel cause???
- Thread starter TheChasers
- Start date
This extended end, is that considered the gasket? Otherwise there is nothing else here, just the pipe.Remove the header and inspect the header seal up in the head. It may be folded over or pinched.
-BIG DAN
(Second photo) It doesnt even look like its room to sit a seal/gasket there?
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The air induction system (AIS) injects air into the exhaust port to help burn any unburned gasses. A side effect of that is decel popping. Usually the first thing people do is remove it and block off the fittings.
Bummer, that would’ve been the easiest thing to fix.
Should be a crush gasket in there.
Yo, I want to mention I may have gone overboard in my basic description.
A good running 4T WILL BE RICH and will normally have extra fuel in the exhaust. This keeps the cylinder cooler and provides the best overall power for running.
This is not normally an issue, unless you have an air leak, where it will pop.
So don't go any leaner than a #45 and 1.5 turns on the screw. From the looks of the hot start application, your jetting is very close.
-BIG DAN
Yo, I want to mention I may have gone overboard in my basic description.
A good running 4T WILL BE RICH and will normally have extra fuel in the exhaust. This keeps the cylinder cooler and provides the best overall power for running.
This is not normally an issue, unless you have an air leak, where it will pop.
So don't go any leaner than a #45 and 1.5 turns on the screw. From the looks of the hot start application, your jetting is very close.
-BIG DAN
Ok. Just got done tossing my 45 back in and putting needle clip back to groove#3.Should be a crush gasket in there.
View attachment 33838
Yo, I want to mention I may have gone overboard in my basic description.
A good running 4T WILL BE RICH and will normally have extra fuel in the exhaust. This keeps the cylinder cooler and provides the best overall power for running.
This is not normally an issue, unless you have an air leak, where it will pop.
So don't go any leaner than a #45 and 1.5 turns on the screw. From the looks of the hot start application, your jetting is very close.
-BIG DAN
I never had one of those seals in my exhaust. Because of the extending edge on my exhaust, it doesnt even look like it has room to fit but I will buy one from Partzilla since Chapparral doesnt even have that part number in their system.
On another thread someone suggested throttle slide plate seal could be bad and causing air leak so Ima check some videos on that too.Should be a crush gasket in there.
View attachment 33838
Yo, I want to mention I may have gone overboard in my basic description.
A good running 4T WILL BE RICH and will normally have extra fuel in the exhaust. This keeps the cylinder cooler and provides the best overall power for running.
This is not normally an issue, unless you have an air leak, where it will pop.
So don't go any leaner than a #45 and 1.5 turns on the screw. From the looks of the hot start application, your jetting is very close.
-BIG DAN
I have been in my garage since noon changing shit, test riding, lol. Never ends. Just put bike back together and pretty sure will have to take carb off to get to throttle slide plate seal
On another thread someone suggested throttle slide plate seal could be bad and causing air leak so Ima check some videos on that too.
I have been in my garage since noon changing shit, test riding, lol. Never ends. Just put bike back together and pretty sure will have to take carb off to get to throttle slide plate seal
wouldn't that give you a lean condition? -BIG DANOk, lol. Closer to figuring out my problem. Good news finally. Ima order seal now. Its no dirt bike shops up here that actually sell gaskets and seals. I was willing to drive to Chapparral but I guess because that part is somewhat "new" as manual said, Chapparral dont have part number in their system. Might try giving them a call tomorrow morning
Yes, it will, lol. Thing is, what Im noticing online. Most people are confusing the 2(backfire and popping) thats why I was confused. Whenever I google or YT popping on decel, everyone is saying its running lean, so it seems majority of people think they are the same.
Missed a 0 when I copied and paste, thats why, lol.
Thanks. Will be picking one up tomorrow morning
