popping on deceleration???

[X2K]

I recently bought a 99 VTR1000, in the US. When i bought the bike it ran great. Its got a full Yosh. exhaust. I brought it back to the dealer complaining about the throttle response, it was very slow and sometimes bogged down if you gave it a quick twist. Also on deceleration it would pop and at times flames would come out the exhaust. ( excess fuel?) So when i picked the bike up after repair they told me that the bike was never jetted when the exhaust was put on, so they did that. Which fixes the throttle response problem. But I still have the popping of the exhaust and wanted to know who may have the same problem or possibly what i should do. I was told to possibly put the bike on a dyno that has sniffers and i may be able to figure it out there if its carb adjusting but otherwise i dont really know what to do. Also one other problem is that at times i know this sounds really weird but i experience a pop or some sort of pressure release in the gas tank. ( while i am riding)

any help would be greatly appreciated

[Pete.L]

Have you done this yet?
http://www.abercon.co.uk/vtr1000/phpBB2 ... php?t=1996

I think Phil,s info is still good

[DD]

Often with open pipes cold air is sucked into the cans (on deceleration) which with a tiny bit of unburnt fuel (or even with out) ignites with the heat inside the can an 'pops' or backfires........... aslong as there isent flame comming out the end cap then this is often normal and nothing to worry about.

[firestorm996]

As he said, unless you're getting flames out the back (usually way too lean) don't worry about it. Even on a closed throttle loads of air is being dragged through the engine but hardly any fuel, it's more noticeable on big twins and big singles but most engines do it to some degree or another.

If you're really bothered by it get the mixture checked during a dyno run tho. Personally I think it just sounds

[Pipstorm]

Must admit, I miss the poppoing on the overrun, that said the bike runs so much better with the kit dyno jet fitted. I wasn't to bothered until Del said that the hot running was due to a lean mixture and that can cause long term damage, mealting pistons etc.

So decided to check it out on the dyno and hey presto with the Hi level cans the bike was running quite seriously lean despite being told they will run on standard settings.

1 jet kit later, everything settled down, the bike runs cooler, the cans are nowhere near as hot as before, no flames, much smoother, I know what I would do if I was in the same position again.



Phil

[vtrider]

Also one other problem is that at times i know this sounds really weird but i experience a pop or some sort of pressure release in the gas tank. ( while i am riding)

any help would be greatly appreciated

I have this problem as well, it's like a little pop under the tank... Mines a UK bike (2000) with remus cans on (so should not need jetting/carb alteration.)

You can’t predict when it’s about to happen, it just does. Any ideas

Cheers

Phil

[simon t]

Also one other problem is that at times i know this sounds really weird but i experience a pop or some sort of pressure release in the gas tank. ( while i am riding)

any help would be greatly appreciated

I have this problem as well, it's like a little pop under the tank... Mines a UK bike (2000) with remus cans on (so should not need jetting/carb alteration.)

You can’t predict when it’s about to happen, it just does. Any ideas

Cheers

Phil

Think you'll find it's coming from the carb and they all do it. Particularly noticeable when waiting at stoplights when it hits you in the nadgers.

Simon

[X2K]

Have you done this yet?
http://www.abercon.co.uk/vtr1000/phpBB2 ... php?t=1996

I think Phil,s info is still good

Yes, and no. I have had the bike jetted and carbs adjusted. But i have not put it on a dyno yet.

[DD]

Also one other problem is that at times i know this sounds really weird but i experience a pop or some sort of pressure release in the gas tank. ( while i am riding)

any help would be greatly appreciated

I have this problem as well, it's like a little pop under the tank... Mines a UK bike (2000) with remus cans on (so should not need jetting/carb alteration.)

You can’t predict when it’s about to happen, it just does. Any ideas

Cheers

Phil

Think you'll find it's coming from the carb and they all do it. Particularly noticeable when waiting at stoplights when it hits you in the nadgers.

Simon

Correct.... it is coughing (back firing) through the carbs most often when given a little rev before down changing.
Nothing to worry about, however I have heard of intake manafold rubbers comming of but this would have to be a big carb back fire.

[X2K]

I figure i might as well keep the same topic open about my bike being buggered up. I am leading to belive that i may have an electrical issue. While going down the highway if i keep the throttle at the same pace, cruising at about 75-80mph it almost feels like the bike cuts out, but with the wheel still spinning it keeps the motor running, and just pop starts itself in about a second or two. Possible ignition coil? somthing, I am starting to get pissed off about this seeing as i have had nothing but problems with it since i bought it. I love the bike but its making me consider selling it.

[RAINMAKER]

suggest you check seal/joint around the link pipes as air entry here on the overun causes popping. this happened to me cos i had not fitted exhaust gaskets (silly me) when i bought and fitted gaskets the popping has almost completly disapeared.

[Pete.L]

Sounds like it's going to be one of possibley four things.
1) still running weak: Try lifting the needles a click or two
2) leak in the exhaust system: look for poor joints/connectors
3) muck in or faulty carb: strip, clean/repair
4) electrical fault: not likely but possible. It woud be happening al the time and not when cruising.

Most likely yor mid range is too lean. After checking air leaks around the carbs and exhaust I would then raise the needles one and see if it improves. If you don't have access to a shop that can check the mixture for you the only way forward will be to run the bike at a constant speed for a few miles and without moving the throttle hit the kill switch. Pull over and remove the plugs, see what colour they are. If they are white it,s too lean. If they are dark brown and sooty it's too rich. If the plugs are white lift the needles if dark lower them. Not the best way to do the job but it should get you close to smooth running.
Pete.l

[Dandare2]

I've had my Storm jetted and K&N'd after fitting some Scorpions about 18 months ago. It ran really well, no popping on the overrun, hardly any stalling once warmed up, smooth as etc.

I took the bike to Hartgate Honda in Mitcham, London for a service and asked them to change the oil and balance the carbs. Now the bike backfires through the carbs a lot more than it used to, stalls at the lights even when warm and seems to have lost a bit of torque at the bottom end. It also seems to use even more more fuel!

I think they've adjusted the mixture and now it's running a bit lean, but am not sure.

Has anyone got any other ideas as to what I should do about it?

Cheers,

Dan

[Pete.L]

Hi Dan.
Sorry to hear that. I've only got one idea,but I think it's a good en

Take it back. Tell em your complaints, find out what they have done to it and tell them to put it right.

Pete.l
Remember: They've taken your money so it should'nt be worse than when it went in