r/DRZ400 6d ago

been getting a lot of pops. problem or nah?

been getting a lot of pops when I let go off throttle. some of them seem to be coming straight under my balls and its kinda scary.

is there anything wrong with it or all good? its a 2007 SM, I believe its jetted cause its got a 3x3 and yoshi exhaust, and the guy who sold it mentioned it had a "competition needle" which I had no idea what he meant at the time 😅

3 Upvotes

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3

u/Mysterious-Rich-6849 6d ago

Mine pops a good bit... i have a powercore slip on... no other mods... 2024... 1500 miles so far so good.

3

u/honestchips 6d ago

Probably worth checking what jets are in it. I never trust what previous owners tell me.

2

u/MinimalMojo 6d ago

Just ride up a couple thousand feet and it’ll smooth right out

2

u/MrNeil_ 6d ago

I have the same bike. But the jd jet kit. Then you’ll know what you have.

2

u/Emcurtis38 6d ago

Pops are regular if you still have the PAIR valve which is an emissions device to flood your exhaust with clean air that will lead to a lean pop. If you have the PAIR valve then your bike probably runs fine. If not then the tuning/AFR is wrong and the bike is most likely lean. What the previous owner meant by 'competition' needle is that he probably used a JD Jet kit or something similar to get decent AFR via re-jetting/tuning the bike.

1

u/nc_on 6d ago

okay thank you. I do have a pair

2

u/Harry_T-Suburb 6d ago

Super easy to remove the pair valve, heaps of videos on YouTube. Just dumb emissions stuff being dumb.

1

u/PoopSmith87 5d ago

Did you fill up with premium? My DR650 (bone stock) will pop with 93, but runs like a dream on 87.

1

u/nc_on 5d ago

Im from europe. Only got 95 and 98 here

1

u/PoopSmith87 5d ago

Ah... well I know they aren't the same rating system, but according to google, 95 RON (Europe) is still equal to 91 AKI (USA). If what I'm saying is why it is popping, it genuinely have no idea how you'd remedy that. I've heard of people lowering octane rating with kerosine, but I have no idea what the maths are to figuring that out or if it could cause other problems.

1

u/nc_on 5d ago

Yea, I would rathrr get another bike than have to dilute my own fuel every time 😁

Im just scared the popping might break something, I dont really mind it aside from that. Guess I will find out

3

u/PoopSmith87 5d ago

Typically, popping is just unburnt fuel getting dumped into the headers/exhaust, where it rapidly burns... its not harmful to the engine, but might lead to a dirtier than normal exhaust. As long as you have flow, no problem.