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Backfiring when shifting with 1/4 throttle
Hey everyone I just rejetted my bike (mods in signature) and it's now popping when shifting and down shifting (pulling clutch in) with only about 1/4 throttle. It doesn't seem to pop anywhere after 1/2 throttle, even after WOT. It also doesn't seem to pop when letting off the gas quickly, only when clutching it to shift.
What will I need to adjust to remedy this popping? I've heard 1/4 out on the fuel screw. What do you guys think? BTW I'm on Maui, Hawaii so pretty much sea level. (jetting in signature) Thanks all. |
you should be all the way out of it to shift down
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I'm thinking 1/4 turn in ,not out.
IMHO your too rich, unburned fuel is igniting in the exhaust,popping. Might even need to drop needle,by raising clip. good luck marc |
turn in a bit...but, i wouldn't go a full 1/4 turn in...i noticed it's very sensitive with the dj128 or dj132...just turn mm at a time, ride, turn in, ride, etc...do smaller turns in...
Originally Posted by darkmarc
(Post 481805)
I'm thinking 1/4 turn in ,not out.
IMHO your too rich, unburned fuel is igniting in the exhaust,popping. Might even need to drop needle,by raising clip. good luck marc |
+1 you just need to tweak it a little. You'll get it dialed-in in no time.
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@toyotabuilder I fully close the throttle when shifting, I'm talking about having it at 1/4 throttle before and after shifting.
@darkmarc I thought popping is a sign of a lean air/fuel mixture not rich? Also, doesn't the needle only affect 1/4 to about 3/4 throttle? It's popping only when the throttle is fully closed. @ahnh666 I would love to that but I have the stock fuel screw unfortunately so It's most likely going to be a PITA to adjust it that many times. @brieninsac Thanks, hopefully I get it dialed in. BTW I copied your signature layout :D Do you have to rip the carb out to adjust the fuel screw? What methods have you guys used when using the stock screw? Thanks guys |
No, use a flat-head drill bit. Hold it in your fingers and twist. The screw is not that tight, you can adjust it with the bit held in-between your fingers.
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+1...:D
Originally Posted by Brieninsac
(Post 481810)
No, use a flat-head drill bit. Hold it in your fingers and twist. The screw is not that tight, you can adjust it with the bit held in-between your fingers.
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Ok I'll try this method but isn't popping a sign of a lean condition not rich?
Originally Posted by Brieninsac
(Post 481810)
No, use a flat-head drill bit. Hold it in your fingers and twist. The screw is not that tight, you can adjust it with the bit held in-between your fingers.
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Depends on who you talk to, and really it sounds like your close as bad popping is when you cut the throttle at any rpm and it's there.
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