TLZone Forums banner

1 - 20 of 67 Posts

·
Registered
Joined
·
389 Posts
Discussion Starter #1
Over the next few weeks (or months) I'm going to attempt to systematically inspect and correct anything that would affect my TLR's performance UNDER 4k RPM's. The bike runs near perfect over 4k RPM's. Throttle response is smooth, quick, and predictable at all RPM's over 4k. Throttle response under 4k RPM's improved some when I put the right IAPS on the bike. Thanks again to Six5 for identifying the problem!
However, it still feels like something is wrong. I'm assuming it's either electrical or fuel related. But I'm a nurse... not a mechanic.
The purpose for this thread is I would like to compile a list of ALL factors that could effect throttle response and performance under 4k RPM's. I understand the bike has several things that change around ~3750 RPM's. I've put together a list of ideas from reviewing several other threads. But I'd like to have one list to go from and hopefully some recommendations on what order to go through this list while trying to correct the problem. So anything you can think of that would effect throttle response under 4k RPM's... please list it here. Thanks!
 

·
Registered
Joined
·
3,485 Posts
A common(ish) problem with TLs is a rough spot around the 3-4K rpm mark. This is usually down to overfueling. As mentioned elsewhere, ensure the vac system is up to spec and if the problem persists seek out someone with a Yosh box. They will be able to correct the fueling and it should fix the problem.

Your local Dyno shop should be able to assist.
 

·
Registered
Joined
·
13,114 Posts
I recently yoshed jappiemike's bike.
I took 5% out of all the low mid and top ranges
Added 4% to the idle to correct the transition from idle
bike is smoother and does not fart on deceleration and picked up 4 Hp on the dyno
And increase the mileage on a tank of gas
 

·
Registered
Joined
·
3,485 Posts
A Yosh box is something a dyno shop is likely to have. Its not guaranteed but its a good place to start.
 

·
Registered
Joined
·
3,485 Posts
Try this lot.

http://motorcycle-repair-shops.cmac.ws/moto-madness/663/

Its a bit of a hike from Vivian but probably worth a call.

Been a long time since I was in that part of the world. I visited a place in Kenner/Metarie that did tuning work on Japanese bikes. Somewhere on I10 as I recall but that's about all I do remember.
 

·
Registered
Joined
·
389 Posts
Discussion Starter #7
I found a shop that has a Yosh box. I'm gonna do the TPS & TB Sync first. But when I'm done... What is the difference between dyno tuning and using a Yosh box?? I have 2 shops to choose from. One says they dyno tune. One says they have a Yosh box.
 

·
Registered
Joined
·
316 Posts
I found a shop that has a Yosh box. I'm gonna do the TPS & TB Sync first. But when I'm done... What is the difference between dyno tuning and using a Yosh box?? I have 2 shops to choose from. One says they dyno tune. One says they have a Yosh box.
you put the bike on a dyno, hook it up and run it, and get the data on what to adjust, and then you adjust it with the Yosh box....
 

·
Registered
Joined
·
389 Posts
Discussion Starter #9
Ok, so if I really want to get the bike tuned right... I need to choose the shop with the dyno. The other shop that only has a Yosh box might not know what adjustments to make... right? Or would a simple test drive give a mechanic all the info needed to make the right adjustments with a Yosh box??
 

·
Registered
Joined
·
3,485 Posts
Depends how clever the guy with the dyno is and what tools he's got available. He should have an EGA with the dyno but he'll need something to make the adjustments with. You do come across these spooks who can tune a motor by sense of smell almost. Trouble is they are few and far between. There's a lot more cowboys than brain surgeons. Talk to the dyno guy. Explain what you think you want and see what he comes back with.

If you don't like the sound of it go to the guy with the yosh box. He may have a good idea of the changes needed. You've also got Ring-in's numbers in the earlier post which might be a good start if you have to "trial and error" it. I don't think he's working today but I can try calling the guy who did my tiller and see if I can get the numbers for the changes he made. Sorted the exact same problem beautifully.

Update: Just spoke to him and he says that unfortunately TLs tend to be all different when it comes to setting up the fueling right. Do one and it wants +5% richer and the next one wants 5% leaner. Fraid he also couldn't remember what he did to mine to make it behave.

He suggested you get the guy with the Yosh box to meet you at the guy with the dyno's shop and you bring the beers.
 

·
Registered
Joined
·
389 Posts
Discussion Starter #11
...you get the guy with the Yosh box to meet you at the guy with the dyno's shop and you bring the beers.
Well, that sounds like the best option. But I'll start with the Dyno guy first. As jonstorp said earlier, the Dyno guy must have a Yosh box or something for making adjustments. I'll stop by that shop first and see what they can do. But I'm still planning on doing the TB Sync and TPS first. And maybe the airbox mod too while I'm all up in there.
 

·
Registered
Joined
·
1,797 Posts
Well, that sounds like the best option. But I'll start with the Dyno guy first. As jonstorp said earlier, the Dyno guy must have a Yosh box or something for making adjustments. I'll stop by that shop first and see what they can do. But I'm still planning on doing the TB Sync and TPS first. And maybe the airbox mod too while I'm all up in there.
Do the air box mod first or you are wasting money at the dyno, since it would need to be redyno tuned after...
 

·
Registered
Joined
·
1,797 Posts
What if I just remove the flappers? Is that enough of an airbox mod?
You don't HAVE to do the airbox mod, but I recommend doing it. The R airbox mod really isn't hard.

Just remove the flappers. Close up the holes, then cut out the restrictive plastic plating around the airbox with something like a dremel.

 

·
Registered
Joined
·
389 Posts
Discussion Starter #15
I did the airbox mod today. Dremel worked great with the new bits I got from Harbor Freight! But I'm gonna leave the airbox off for a while until I get this TB sync done. I was hoping the flappers had something to do with the low RPM issues... but I ran it a bit today with the whole airbox off and the throttle response under 4k RPM's still feels the same. :(
But the airbox mod is done and that'll give me less to do later.
 

·
Registered
Joined
·
389 Posts
Discussion Starter #16
One thing I did notice is what looks like engine oil around the rear cylinder intake. It's similar to what I found the first time I pulled off the airbox. I was told it's somewhat normal for an oil residue to build up in the rear of the airbox. But I actually found the same oily residue IN the rear cylinder intake! Is this normal? If not, what could be wrong??
cylinder_intake.jpg
 

·
Registered
Joined
·
389 Posts
Discussion Starter #17
Another thing on the subject of the airbox... I had to remove the foam from where the RAM air enters the airbox. It was dried and crumbling and even a little moldy?!?! I figured if I didn't pull it all off it would end up in the engine at some point. Is there any way to replace the foam? Or is there something better to put around the RAM air intake? Is it even necessary to replace the foam?
airbox_foam.jpg
 

·
Registered
Joined
·
4,232 Posts
..... But I actually found the same oily residue IN the rear cylinder intake! Is this normal? .....
Not uncommon to have an oil mist in the airbox - due to the crankcase vent. Was the air filter beginning to disintegrate? Allowing debris through?



...... I had to remove the foam from where the RAM air enters the airbox. ....Is there any way to replace the foam? Or is there something better to put around the RAM air intake? Is it even necessary to replace the foam?
...
You'll never notice the missing foam unless you spend most of your riding time in the triple digits.

However, if it makes you feel better to have it in there, a number of automotive weatherstrip products have been successfully used to replace it. Probably more durable than the OEM foam too.
 

·
Registered
Joined
·
389 Posts
Discussion Starter #19
Was the air filter beginning to disintegrate? Allowing debris through?
The air filter seems to be intact. There's some debris in the filter but nothing seems to be passing thru. But when I opened the airbox the first time, a few months ago, I did notice a lot of oil and that little black filter/screen material in the back of the airbox was disintegrated and allowing a lot of the oily residue into the airbox. So maybe that's what's in rear cylinder intake. And maybe that's why it's in the rear and not the front cylinder intake.

Has anyone ever done a sea-foam treatment on the TLR? If so, what's the best way to do it??
 

·
Registered
Joined
·
389 Posts
Discussion Starter #20
It's been recommended by several members here that I check the condition of all the vac hoses. Now that the airbox is off and I can see it all, the vac hoses all look great! I'm planning on cutting a half inch or so off of each of 'em if I have enough slack, but they all look good. The only thing I've found cracked is this big hose on the left rear of the airbox. I've put some electrical tape around cracked hoses like this before on tillers and lawnmowers. Will that work for this one? Any better solutions? The cracks don't seem to be long enough to leak. I don't even know exactly what this hose does. :(
airbox_hose.jpg
 
1 - 20 of 67 Posts
Top