help/advice please - decel pop

[04asphalt]

te610 been popping on decel since day one. mounted a Barret muffler then had it adjusted with iBeat. seemed to cure most of it for a couple hundred miles but now it's back
air leak???
I feel a very little leak on the front end of the can by the rivets
how do you get to the bolts to snug the header?

 

[Coffee]

I don't know, hopefully some helpful person with a 610 will reply to you. I do not have a 610.

 

[TheDutchman]

I've always heard that decel pops were normal... Mine does it too!

 

[Coffee]

I've always heard that decel pops were normal... Mine does it too!

Good info. I noticed from your previous posts that you have a 2009 TE610 (with efi). I've got no idea what normal is for the efi bikes in regard to popping on deceleration.


The other bike is question is located in south west Michigan. I know that area extensively and the really is no major elevation changes, and that has bothered me. Decelerating downhill with clutch out popping occurs more than on level ground.

My hunch would be the Barret muffler. If it were my bike I'd put some tape on the air leak... or at least somehow try to confirm there is a leak.

And I've got no idea how to tighten the bolts on the header on a 610 either, I assume that is were the exhaust attaches to the engine.

 

[Nesbocaj]

Dyno after I Beat? Power-up kit?

You may want to determine how lean the bike is running with
the freer flowing exhaust.

A simple check may be to do the resistor mod, then see how it runs.
You can leave the lambda in for a short test.

If you did all of this already, then seal up the exhaust joints with some high temp RTV.

 

[04asphalt]

another issue is when I start the bike with the choke lever as soon as the bike warms up the rpm on idle goes up,down,up,down every second or two.
once I close the lever idle is fine.

 

[Coffee]

another issue is when I start the bike with the choke lever as soon as the bike warms up the rpm on idle goes up,down,up,down every second or two.
once I close the lever idle is fine.

You have an 08 TE610 with efi. Those really don't have a choke, when the 'choke' is 'on' it has the same effect as the idle screw on the other side of the carb being turned for a higher rpm - it adds more air.

That may be normal, or maybe use an ibeat tune up, don't know.

 

[NOTsoHUSKY]

AFAIK singular pops are fine, if it sounded like a machine gun everytime you cut the throttle on decel then i would be concerned. No pops at all would probably be an indicator that you are too rich...

I get the occasional pop on my 08 610.

 

[High-Side]

Mine did he same thing until I finally put the Lamda sensor removal kit on it and now it runs great and no pops.

 

[mxracernumber1]

You have an air leak-more proably an exhuast side leak. Make sure EVERYTHING on the exhaust is tight. Check intake as well.

 

[04asphalt]

You have an air leak-more proably an exhuast side leak. Make sure EVERYTHING on the exhaust is tight. Check intake as well.

are you referring to the decel pop, the warm idle or both?

 

[plcvr4]

Your bike ( all 610 huskys as well ) from the factory is too lean upon deceleration
You need to put the Lambra kit by pass and your bike will run like it never run before ( very responsive , no popping whatesoever)
You will need to adjust your idling down from 2000 rpm to 1600 rpm after the install
You will wonder how you could drive your bike before the mod and think it was running well

 

[palmczak]

Your bike ( all 610 huskys as well ) from the factory is too lean upon deceleration
You need to put the Lambra kit by pass and your bike will run like it never run before ( very responsive , no popping whatesoever)
You will need to adjust your idling down from 2000 rpm to 1600 rpm after the install
You will wonder how you could drive your bike before the mod and think it was running well

The decel poping is normal. Poping on decel can mean a lean condition but not always. My bike pops and I live at 9000 feet I have a hard time believeing it is lean up here. I have also checked the piston with a borescope and it shows 0 signs of burn or excessive heat.

Disclaimer -- This wording is not mine, but explains what is happening very well!

You start out with an engine that is turning high RPM with a carb (FI) that is open, flowing freely. Next, you close that throttle. This has the effect of creating a tremendous vacuum in the intake manifold (CHOKE!). This vacuum does curious things:
1. It pulls air and fuel from wherever it can--including the idle and low speed jetting in the carb.
2. To counteract the vacuum, air will take the path of least resistance--including sucking exhaust gases back into the combustion chamber during valve overlap (the brief period of time that the exhaust and intake valves are open at the same time.

So what does this mean? Well, now you have a disproportionate rich mixture heading for the cylinder AND what little oxygen is drawn in is further diluted by gases that are coming back into the chamber from the exhaust valve. The result is poor, incomplete combustion! Depending on the temperature of the exhaust pipe and gases, reignition is possible once this mixture is introduced into a more oxygen rich environment. This produces the "pop."

Why does a lean running engine have a tendency to excessively pop? The exhaust gas temperature of a lean engine is substantially higher than one that is running on the rich side ( an EGT probe will show this). Therefore, the high EGT serves to heat the pipe more and the gases themselves become a much better source of re-ignition. By richening (power up mode) things up, you are cooling down the exhaust temp and therefore reducing potential re-ignition sources.

Any 4 stroke engine--even those that are flawlessly tuned will pop on decel. It is harmless, but can be annoying--granted. However, I would never alter the jetting of an otherwise performing motorcycle to get rid of it. Go by the seat of your pants and the color of your spark plug rather than the popping as an indication of the jetting of your scoot!

 

[suhr]

te610 been popping on decel since day one. mounted a Barret muffler then had it adjusted with iBeat. seemed to cure most of it for a couple hundred miles but now it's back
air leak???
I feel a very little leak on the front end of the can by the rivets
how do you get to the bolts to snug the header?

I just found out mine was missing the rubber washer and O ring on the needle ! From the dealer in 07 !

 

[04asphalt]

I just found out mine was missing the rubber washer and O ring on the needle ! From the dealer in 07 !

which washer/o-ring?

I put the gutted(removed cat packing and drilled four small holes in the exit end baffle) stock can back on and popping is all but gone.
had the FI adjusted for the Barret, should I be fine with the gutted stocker or do I need the FI adjusted again?
if the stock can is still more restrictive will it run too rich or .....?

 

[audible]

Lambra kit...what is this and does it apply to TE450's??

 

[Dirtdame]

Lambra kit...what is this and does it apply to TE450's??

For fuel injected models.