Running lean (I think) - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 22 Old 05-09-2018, 04:39 PM Thread Starter
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Running lean (I think)

So I'll start off by saying don't crucify me, I've sifted through all the posts I can find but didn't really find exactly my symptom. It's not the clutch basket problem (Which I definitely have and will need to address), and it's not a constant flat spot in the factory tune as that would happen at all throttle positions.

What I'm experiencing is a slight lean out condition, or what I'm assuming is it running lean, anywhere from 2.5k-4 at cruising throttle or very light throttle. Just a light surging and if I let off the throttle when it happens some slight pops from the exhaust. If I power through it it's perfectly fine.

I have a Leo Vince exhaust system with the baffles out. If I put the baffles back in it definitely helps, but it's still there.

I'm coming from the land of carbs so I know a lean condition from tuning them, but my question is shouldn't this be well inside the stock tuning parameters? You'd think the FI would be able to account for the slightly more airflow an aftermarket exhaust would give. Is it a pretty primitive system?

Could this may be tight exhaust valves? Bike has 60,000km on it and the last owner wasn't aware of the valves ever being adjusted. I couldn't find any threads that explains the symptoms of a needed adjustment.

A power commander was always in the future for this bike so if this is just a classic lean out condition because of the exhaust and stock tune then I'll just bite the bullet sooner than I planned to.

Thanks guys, loving the V-strom life so far!

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My Suzuki line-up:
-'11 SX4 AWD
-'07 Grand Vitara
-'03 DL1000
-'01 GS500
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post #2 of 22 Old 05-09-2018, 04:59 PM
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First generation DL 1000's are running lean in that rpm/load range when new. If not in perfect tune, they will do exactly what you describe in stock form. Some even do it when in perfect tune! Install aftermarket exhaust and it can be worse.

Many have used the Power Commander to fix/help the problem. I never completely got rid of it on my Vee. There are problems with Power Commanders, and a drop in range/fuel mileage can certainly be one of them.

'12 DL 650 '14 BMW R 1200 RT

WERKS modified clutch baskets for DL and SV 1000's.
The BEST in chudder control, noise control, and lasting durability! AVAILABLE HERE: www.werksparts.com

Have questions about the clutch in your DL or SV 1000? E-mail Terry [email protected]
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post #3 of 22 Old 05-09-2018, 05:16 PM Thread Starter
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Quote:
Originally Posted by realshelby View Post
First generation DL 1000's are running lean in that rpm/load range when new. If not in perfect tune, they will do exactly what you describe in stock form. Some even do it when in perfect tune! Install aftermarket exhaust and it can be worse.

Many have used the Power Commander to fix/help the problem. I never completely got rid of it on my Vee. There are problems with Power Commanders, and a drop in range/fuel mileage can certainly be one of them.
So it can be tuned out with a PC but not completely? Maybe I'll leave the baffles in until I can get a PC. Just about to spend my weekly motorcycle parts budget on a clutch basket from you!

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My Suzuki line-up:
-'11 SX4 AWD
-'07 Grand Vitara
-'03 DL1000
-'01 GS500
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post #4 of 22 Old 05-09-2018, 05:35 PM
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So you just couldn't find this sticky topic in the 02-12 1000 section huh?

https://www.stromtrooper.com/dl1000-2...ng-issues.html

BRIAN "GO Buckeyes, GO Wildcats"!

2015 DL650 XT "Hector"

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post #5 of 22 Old 05-09-2018, 06:36 PM
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Wagoneer: A PCFC would help you solve the problem and much cheaper would be to get someone to "flash" your ECU to make the low end richer, that would solve the problem too. All this is predicated on your having an early DL 1000. You have the same symptoms as most other early 1000s, including mine. I now use a PCFC and it runs like a top, once tuned by someone who knows what they are doing.
I have, and also recommend, Realshelby's clutches. However, my lean issue, like yours, made me CRAZY. So I'd fix that first so at least you enjoy riding the bike with whichever clutch it has at the time.
Vees run lean at low throttle positions and rich when wide open. If you can correct the low end lean condition you can leave the rest alone. Have fun with it.
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post #6 of 22 Old 05-09-2018, 08:25 PM Thread Starter
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Big B - I did, but honestly that thread is a mess and many posts just get lost.

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My Suzuki line-up:
-'11 SX4 AWD
-'07 Grand Vitara
-'03 DL1000
-'01 GS500
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post #7 of 22 Old 05-09-2018, 08:29 PM Thread Starter
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Bobbyvstrom - I think the plan is to get a PC and try one of the tunes that I hear are available on the site. If that doesn't clear it up, I have a local motorcycle dyno close to my house.

Btw, sorry for not quoting properly - tapatalk will not let me quote posts for some reason on this forum.

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My Suzuki line-up:
-'11 SX4 AWD
-'07 Grand Vitara
-'03 DL1000
-'01 GS500
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post #8 of 22 Old 05-09-2018, 11:42 PM
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Quote:
Originally Posted by Wagoneer View Post
Big B - I did, but honestly that thread is a mess and many posts just get lost.

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Hmmmm can’t say I agree with that, but yeah it’s a big thread for good reason. No question you are too lean, the map I made to share is one of the more popular and I too had Leo’s. There is another thread for maps, but unfortunately are overwhelming for the PCIII and not the PCV. Contact Fuelmoto...they’ll hook you up with a PC and get ya tuned.

Im sure your throttle bodies are also in dire need of synchronization.

BRIAN "GO Buckeyes, GO Wildcats"!

2015 DL650 XT "Hector"

1997 Honda Valkyrie 1500 custom “Dolores”




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post #9 of 22 Old 05-10-2018, 04:37 AM Thread Starter
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Well this turned into an expensive venture. PCV from fuelmoto on the way and whenever I get an invoice for a clutch basket going to order that as well. Found a good thread for the TB sync as well. Hopefully I can get all this done with minimal downtime. Was going to get some new aluminum hard cases but I feel this stuff is more important. I can suck it up and use the OEM cases for one season.

Btw for anyone who might stumble upon this thread in the future, I have a '03 DL1000. I'll make sure to come back to update for archive reasons.

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My Suzuki line-up:
-'11 SX4 AWD
-'07 Grand Vitara
-'03 DL1000
-'01 GS500
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post #10 of 22 Old 05-10-2018, 09:15 AM
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Quote:
Originally Posted by Wagoneer View Post
Could this may be tight exhaust valves? Bike has 60,000km on it and the last owner wasn't aware of the valves ever being adjusted. I couldn't find any threads that explains the symptoms of a needed adjustment.
Wagoneer, check your valve clearances regardless. Valve check/adjust is a maintenance procedure, not a repair procedure, and if you dont know they are within spec, you need to find out they are OK or not and adjust them accordingly.
It's possible that a clearance check/adjustment wont improve your driveability issue. Doesnt matter.
Diagnosis always starts with Engine Mechanical--> Engine Electrical-->then Fuel System in that order.
Never assume all is OK unless you know all is OK. It's easy to miss problems or potential problems otherwise.
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