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

 

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...

 

+1 you just need to tweak it a little. You'll get it dialed-in in no time.

 

@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

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.

 

+1...

 

Ok I'll try this method but isn't popping a sign of a lean condition not rich?

 

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.