Burble/Hesitation Question?

[SUPERTUNER]

Does anyone have this kit working without this problem???

By now there should be tons of these out there!

Perfect example that the dyno can't tell us everything unfortunately that we need to know!!

It'll all work out!

BR

If you are referring to the air filter kit, the answer would be yes. There are lots of them out there not experiencing this problem. 2 in particular that came directly from ECP and off the dyno too. These 2 did not burble or hesitate on the dyno nor did they hesitate or burble in the field. I do however agree that both dyno and field testing is a must. More appointments are scheduled in our shop for this mod and I would love to experience the burble on the dyno, come up with a cure and tell you all about it.

I also have witnessed myself this burble in stone stock RX1's. The airbox acts a bit like a muffler and hides the sound to some degree. By and large when a modification of any kind is apparent, most always blame whatever they did last for the cause of the problem. I think it is quite possible that some RX1's are more prone to this than others. Until I have the opportunity to experience it, I cannot do anything but speculate what may cure it. The next RX1 we are doing is presently in the shop...if it works out well, I will post in extreme detail the step by step method that we did the work in the order it was done in.

I even had one customer who called me and claimed that there was indeed a slight burble but that it went away by itself??? Can't quite figure that one out but we will continue to work on this and report back if we have anything concrete. You all please do the same.

Freddie

 

[MR.HAPPY]

FREDDIE, Do you think that if your sled doesn't do this burble with the Holtzman springs & stock airbox that it probably won't with your filters!

Also does the two that you have done in the shop have aftermarket exhaust?

BR

 

[Cubby's RX-1]

Good question there BRX-1! I got the same pipe Ride Blue has so I ordered the exact kit from Freddie. Ride Blue's sled is working perfect so I am hoping mine does the same. I will defineatly post here my findings as soon as my kit gets here.

 

[snowbeast]

My kit is not in yet,but it is ordered,and if mine has a burble at 5,000-5500 i am not worried at all,as at that low of a rpm you would have to be coming down a hill or steep terrain,w/brakes on to notice it,or have it give you fits,do most of us run around at 5,000 grand, i dought it,but if it can be fixed it would be cool to, i think most of us that have not even installed the kits are getting all worked up for nothing,just my 2 cents. :lol:

 

[GUKROKIT]

I've been following all the posts regarding the filters springs and of course this burble issue.I have yet to see anyone mention richening up the pilot jets to compensate for all the air you get with the k+n's.Hauck was sending out richer pilots,160 mains with his filters.Could this burble be a momentary lean condition at lower throttle settings that goes away when you start to get into main cicuit (165's)at larger throttle openings?I would love to test this theory but sled not together yet still waiting for my wide a-arms from pioneer! at what throttle opening does the pilot stop having an effect?does the pilot only affect idle or does it overlap into the mid range?

 

[RocklandRX1]

GUKROKIT...where are you from...Albany area......if so do you ride in the Woodford, VT area?

 

[redbarron]

burble hesitation question

I have posted my results like them or not and i will keep changing springs until i can find hesitation. my clutch engagement is 4500. 5000rpms will hardly move the sled. I have read all the information posted on this subject and i see that there is troubles with stock air box and springs.I guess ECP should solve this too you guys should be thanking him.Anybody that wants to trail ride at 5000-6000rpms i have a good deal on a elan getitdone

 

[SUPERTUNER]

FREDDIE, Do you think that if your sled doesn't do this burble with the Holtzman springs & stock airbox that it probably won't with your filters!

Also does the two that you have done in the shop have aftermarket exhaust?

BR

I think that the ones that are not doing it did not do it regardless of what springs they have in the carbs.

One was Ride Blues sled with a Bender loud exhaust. The other had stock muffler.

Gukrokit asks:

"Could this burble be a momentary lean condition at lower throttle settings that goes away when you start to get into main cicuit (165's)at larger throttle openings?I would love to test this theory but sled not together."

Yes it could...that is why I explained in detail the simple tests about LA/MA...Less Air/ More Air. Has anyone done this yet?

mnmsnowbeast states:

"My kit is not in yet,but it is ordered,and if mine has a burble at 5,000-5500 i am not worried at all,as at that low of a rpm you would have to be coming down a hill or steep terrain,w/brakes on to notice it,or have it give you fits,do most of us run around at 5,000 grand."

There is a possibility that a hesitation/burble/stumble/breakup/whatever will affect the rate that the engine is capable of responding to an increase of throttle. If the powercurve is deficient early in the acceleration sequence, it is possible for it to affect the rate of acceleration as it has to recover from the offending area first in order to straighten out and run properly for the remainder of the acceleration run. This means a duration of time is involved. If a duration of time is involved, and there is a poor area of acceleration even though you are not using this area a lot, it could still take a longer duration of time to overcome the offending area thereby taking longer to make the newly improved power that it does have.

Did that make sense?

 

[RX-1snow]

I also experienced this burble at 5500-6000 RPM and am convinced it is directly related to the green carb springs I installed , as this was the only mod I made. I also think it might be a momentary lean spot.

To try and test this therory, I plan to remove the interior of the airbox or the complete air box and then test . If it improves, its a rich spot , if it worsens , its a lean spot. I will drop back soon to let you in on my results.

 

[low flying missile]

It is just my gut feeling that the burbling might be caused by the infamous enrichener plungers not being fully closed or leaking. I have read that changing needle or air screw settings does not improve the condition.We know it will be impossible to have proper carb sync if any of the plungers are incorrectly set or sticking due to varnish buildup.That may also explain why a customer of Supertuner said that the condition went away on its own. A 4stroke may run poorly on gas from last season but won't burn down.The carbs may clean them selves with the first couple of tanks of the season and fix the problem.

 

[redbarron]

burble hesitation question

Rx-1 snow + Low f m Nowyou guys are thinking these are the ideas that will help solve this problem for you. redbarron getitdone

 

[Blue shadow]

Freddie did you get a chance to send my filter ket ?THANKS

 

[True Blue]

Hey freddie,

Installed & tested my K&N kit today with new plugs and Red Holtz
springs it is very crisp on the throttle and sound awsome along
with the Bender can. :twisted: Will advise if any " burble " problem.

Also installed fuel shut-off valves and something else that dresses
up the engine compartment will post pics in the next day or so. 8) 8)


TB

 

[Toolman]

Hello? Hello? Hello? I don't have the ECP filters. Don't blame Freddie. Yes I tried richening the pilots, worse. It is definitely rich not lean. Stock airbox and green springs. How about this, would someone try the stock springs with the filters just to verify the problem leaves with the filters in place. The burble only comes on with the stock airbox and the lighter springs. Lets see if it goes away with the filters and stock springs.

 

[yamadave]

I installed the filters last night with the silver springs, I took a short spin and did not notice the burble. I cleaned the carbs up while I had them out. I didn't ride very long as we have no @#$%@#% snow. Personally, I would not really care if it does have the burble. My past experiences with bikes and K&N's always seemed to have some issues @ lower rpm's, but in my opinion the gains in throttle response and power offset the minor annoyances.

Just my .02