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 Post subject: Popping and backfiring
PostPosted: September 8th, 2017, 11:16 pm 

Joined: September 8th, 2017, 10:35 pm
Posts: 4
Recently bought a XL600V 1994 model with quite a bit of mileage. But Engine sounds good, there's a surprising amount of torque/punch in the bike and it rides very well.

However, on idle speed downhill there's quite a bit of pops and explosions. The bike does not have original exhaust, and that this is the reason for the issue. Some has suggested pilot screws or fuel/air mix needs to be adjusted properly. Furthermore that change to a non-OEM exhaust means handbook adjustments might not apply.

I've been looking at the carbs and picture but I cannot work out exactly where/what the pilot screws are?

Thanks in advance for any help/insight

PostPosted: September 10th, 2017, 12:16 pm 
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Joined: July 14th, 2014, 4:55 pm
Posts: 444
Location: California USA
Welcome Nordalp, Nice looking bike.

It would be helpful if you would fill out your profile and let us know where you're from.

Before playing with the Idle screws make sure there are no exhaust leaks. Small popping can be caused be the Idle screws being out adjustment. Loud back firing under deceleration is usually caused by an exhaust leak allowing fresh air to ignite un-burned gases in the exhaust system.

Ride Now, Work Later!

89 Transalp XL600V X3, 01 Goldwing GL1800, 99 Varadero XL1000V
05 CRF450X Plated, 01 XR650L, 84 Passport C70

PostPosted: September 10th, 2017, 2:42 pm 

Joined: June 12th, 2016, 2:38 am
Posts: 118
Location: Tauranga, NZ
I had that with my -95. I took the pipe down, cleaned (the inside welds in the headers too!) and sealed all the joints and the popping was gone. I'm running stock exhaust thou...

Whereabouts are you?



I'm from Finland, live in NZ and ride Transalp XL600VR 1995

PostPosted: September 16th, 2017, 4:52 am 
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Joined: July 8th, 2011, 7:02 am
Posts: 1114
Location: Mackay, Queensland, Australia
I have read that aftermarket exhausts can cause the popping etc on overrun, like running down hill on a closed throttle. If I remember correctly it's because they are usually more free flowing than original and that affects the fuelling and causes the popping.
Take notice of what Skyliner and neppi said because I'm a train driver not a mechanic.

Born to be MILD
2003 Honda XL650V Transalp; 1977 Kawasaki Z750B twin;
2006 Hyosung GT250R; 2001 Yamaha FZS1000.

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