Pop and bang on the overun - .: XT660.com

Ilkleyal · # 1 04-10-10, 21:44

Sorry, another newbie question, please be patient and I will in turn have a lot of useful input myself.

I have had a brand new big bore single before back in 2001 twas a KLR650. I dont recall it popping and banging the way this new tenere does. is this normal, we are talking big pops everytime the throttle is closed

I took it for a 2.4 mile ride tonight, its now got 4 miles on the clock

and the exhaust was smoking like a couple O smith and wessens down at a rootin tootin shootin gun-slinging competition. That will just be residue from the manufacturing process.

Probably normal to bang and pop but there must be unburned fuel in the system for it to do this. Early days yet I suppose. Was inpressed with the gearchange after my BMW and the ride was very smooth. Keeping to 4.5K revs for the first 600 Miles of course

Al

Tony660x · # 2 04-10-10, 22:11

Pops and bangs are normal. Some block off the ais to reduce this. Myself I love the pops and farts. It's character.

dazmatic · # 3 04-10-10, 22:17

Yeah, they're very normal.

There is a system on the bike called Air Induction System (I think) or AIS.

Basically, when the engine is on overrun, it opens a small valve letting COLD air directly into the HOT exhaust. Any unburnt fuel in the exhaust will get burnt up pretty much unstantly causing the back firing through the exhaust.

What a lot of people do to prevent this, like Tony says, is to block the AIS pipe from the airbox prevent the air getting into the exhaust.

XTsheedy · # 4 04-10-10, 22:24

Hi, Im new too, but the pops and bangs sound great and personally I cant wait to get the loud pipes on just to amplify the pops and bangs

and that gearbox is really smooth.

dazmatic · # 5 04-10-10, 22:40

Oh yeah, don't get me wrong, I love the sound of it backfiring!

But, because of the current setup of my bike with having an autotune, any extra air in the exhaust throw the readings out so I had to block the AIS off.

CaptMoto · # 6 05-10-10, 00:01

Ilkleyal, I've moved a few of your posts in the appropriate sections, please be guided that the Newbie Reception Lounge is just for newbies to introduce themselves to the knuckleheads, once you've done that, all technical questions must be posted in the appropriate sub forums, so that we keep all kinds of topics in the correct place.

Thanks.

You now have my permission to come out of the Newbie's closet.

A7 UFO · # 7 05-10-10, 09:02

Quote:

Originally Posted by XTsheedy

and that gearbox is really smooth.

it won't be for long once your cush drive starts going

dazzerrtw · # 8 05-10-10, 12:25

Quote:

Originally Posted by Ilkleyal

Sorry, another newbie question, please be patient and I will in turn have a lot of useful input myself.

I have had a brand new big bore single before back in 2001 twas a KLR650. I dont recall it popping and banging the way this new tenere does. is this normal, we are talking big pops everytime the throttle is closed

I took it for a 2.4 mile ride tonight, its now got 4 miles on the clock

and the exhaust was smoking like a couple O smith and wessens down at a rootin tootin shootin gun-slinging competition. That will just be residue from the manufacturing process.

Probably normal to bang and pop but there must be unburned fuel in the system for it to do this. Early days yet I suppose. Was inpressed with the gearchange after my BMW and the ride was very smooth. Keeping to 4.5K revs for the first 600 Miles of course

Al

at 2.4 miles a day you wont need the 600 mile service doing for 4 months

A7 UFO · # 9 05-10-10, 12:29

Quote:

Originally Posted by dazzerrtw

at 2.4 miles a day you wont need the 600 mile service doing for 4 months

I'm not sure I understand your calculation. 600 miles divided by 2.4 miles per day = 250 days = about 8 months

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