Low rpm stumble problem

[JohnnyV]

Hey guys, I posted this on the TL forum, but I'll throw it up here as well. I've noticed that if I'm cruising at a steady rpm and throttle position below 4500rpm, say in 2nd gear, and just whack the throttle open, it will bog down, stumble, and then maybe a second or two later it will pick up and accelerate. If I smoothly roll on the throttle it won't do it, but when I just slam it open to the stop it does it quite consistantly. Any ideas? All the bike has done to it is Jardine slip-ons(which don't have exhaust gaskets between the cans and mid pipes at the moment). I also just put in new plugs and a new air filter, as well as changed the oil and filter.

[wylee]

It just means you're riding a TL; you'll learn to like it. Slight hesitation, then monster wheelie.

Seriously though, a TB sync and TPS adjustment will probably help a lot.

[JohnnyV]

Yea someone responded on tlplanet with the same response.... now I just gotta read the how-to for each and have at it.

[LiononaLeash]

02T,

Like Wylee said, TB sync and TPS set. Then take it to a dyuno shop and get a map. You are probably lean in that area. I had an 02 TLR that did that until I got a new map. The TB Sync and the TPS set were not enough to completely fix it in my case.

Also, we need to check the hoses,airbox, and throttle body assemblies for vac leaks.

If you want to head to my place I'll show you how to do it and do it with you the first time(the Sync and the TPS). I do mine once a year.

I know exactly what you are talking about.... no fun cruising along and have your helmet practically smack off your windscreen.

[JohnnyV]

Yea I'd appreciate it.... it's always better to do such things the first time with someone who's been there before.

PM sent

[KB]

TPS fo shizzle yo!! Get it set right or take it out of the loop.

KB

[gmdboston]

It's jetted too lean. The CV carbs can make up for some of the sudden gulp of air, but not all of it. A carb sync and the TPS adjustment do will nothing. You need to get the jetting right. Sounds like you need to go 1-2 sizes bigger on the pilot jet, down a groove or two on the needle and maybe 2-4 sizes larger on the main jets.

[JohnnyV]

The bike is fuel injected

[gmdboston]

Sorry, I was thinking of an other bike (the SV), but the problem is the same, too lean. Get it mapped.

[JohnnyV]

I wouldn't think that with only slip on pipes and the stock ecu, I would need to get a power commander and a custom map. I will try the throttle body synch and tps adjustment first before I look further into it. Most of the TL owners who have responded to my post here and on the tl site feel that those two things are most likely what's causing the problem.

[LiononaLeash]

The problem area is a little lean to begin with as it comes stock(something about emissions and import standards). Changing the cans is often just enough to cause a problem.

Also, some places can flash your bike's ECU and you won't need a Power Commander.

[beet]

wheelie TB sync and TPS set. Have Bob help ya.

[LiononaLeash]

Yeah, he's coming to my house probably this week. There's no point to getting it remapped unless the TB's are sync'd and the TPS is set first.

[JohnnyV]

How much would a ecu reflash cost?

[LiononaLeash]

It varies from shop to shop. But its less than if you bought a power commander. Its not as precise, but its plenty good enough to get rid of the stumble.

[RandyO]

a lot of the strom 1k's have the problem too, alegedly 2800-3200 rpm or so,

I haven't noticed and problems yet with my 07

[LiononaLeash]

Yeah the TLR problem is someplace between 3500 and 4200 rpm

[beet]

With the pc unhooked I get wicked 2800-3200 stumble on the S caugh ptttttttt

[Josephd14]

Also If it does not have a TRE it will do that with a snap of the throttle, it's a safty thing.. And Pete K. is right it needs a PC and a remap or you need to find someone iwth a Yoshi box or a Mak Box or something to remap your ECU.. Hit up this site, you'll find some useful links.. Chuck Sirois.com

[LiononaLeash]

...And Pete K. is right it needs a PC and a remap or you need to find someone iwth a Yoshi box or a Mak Box or something to remap your ECU...

...and the actual TLR owners like us are right too.

[beet]

Also If it does not have a TRE it will do that with a snap of the throttle, it's a safty thing.. And Pete K. is right it needs a PC and a remap or you need to find someone iwth a Yoshi box or a Mak Box or something to remap your ECU.. Hit up this site, you'll find some useful links.. Chuck Sirois.com

Chucks a good guy & a smart ass he even helped me with my feet.
Make sure you ask him about beets feet.

[JohnnyV]

...and the actual TLR owners like us are right too.

Well I'm gonna wait until you get a chance to check out my bike and apply your veteran TL opinion... then we can go from there in terms of whether I need to do something further after the tb synch and tbs adjustment.

[LiononaLeash]

veteran opinion:

If it still stumbles after we do the work, get it remapped.

At least it will be ready for that work to be done.

[wylee]

someone iwth a Yoshi box or a Mak Box or something to remap your ECU..

Or build your own with Steve's schematic.

[highsider]

Burn it.