Wee - Jerky EFI? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 14 Old 08-01-2011, 03:46 AM Thread Starter
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Wee - Jerky EFI?

Hello,

I have been riding a GSX650F for several years now and I am thinking of trading it in on a used Wee, primarily for comfort and economy issues. It is likely to be the last bike I buy for another 10 years or so due to finances.

I have been riding for nearly 20 years now and the GSX650F was the first EFI bike I have ever owned (and also the first - and last - bike I have bought brand new). One of the issues with the 650F is it's jerky EFI. In particular at very small throttle openings the power cuts in and out. It is not at all linear or smooth like you get from carbed bikes, it is either on or off. Usually this is not a problem since you ride with the throttle open in the region where the issue doesnt occur, but it is really starting to get to me, especially in heavy traffic. I is getting to the point that I no longer want an EFI bike.

So...is this a Suzuki EFI thing, or is it just the 650F that is afflicted. I know that the 650F has some of the strictest emmissions controls of any bike so it could be that. If the Wee has the same issue then the decision to go with an older, carb'd Wee becomes easier (cheaper to buy and easier to DIY maintenance). I should note that the jerkiness I describe is a well known issue, so it is not a matter of riding technique or inexperience on my part.
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post #2 of 14 Old 08-01-2011, 06:39 AM
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There are a couple of issues with the Wee, but the EFI itself is just sensitive, not jerky - these might also apply to your current bike.

New, yes, it's jerky. After about 1000km's that went away.

That leaves issue #2:

Stock the front suspension is soft and underdamped - I thought it was jerky EFI until I did some suspension work - what was happening is that the throttle was moving under my hand every time I hit a bump, which made the bike jerk, which made the throttle move, which made the EFI seem jerky - that fixed and it's fine.
Still needs a delicate touch, but it's tractable enough to cope with nasty offroad - so probably O.K. once run in.

The Wee was carbed from the get-go so no get out of jail there.

Peter
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post #3 of 14 Old 08-01-2011, 06:58 AM
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There are no carbed DL's. Gen I SV's had carbs.

I've owned an 05 and an 09 and find the "fueling" as the Brits call it to be good. You'll have to ride one yourself.

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post #4 of 14 Old 08-01-2011, 09:02 AM Thread Starter
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Quote:
Originally Posted by garandman View Post
There are no carbed DL's.
I thought that Wee's had carbs until 2006 after which they got efi. Or am i misunderstanding something?
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post #5 of 14 Old 08-01-2011, 09:02 AM
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All wee's are EFI. In 2007 they changed the throttle bodies and went to the dual-plug system. Read the DL650 through the years.

I recently went from a carb'ed bike to a wee. This is my first EFI bike. I do find the fuel injection to be a bit jerky at low throttle inputs. I'm having a very hard time getting used to going from no throttle to some throttle smoothly.

I honestly don't think it can be avoided with EFI.
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post #6 of 14 Old 08-01-2011, 09:31 AM
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Quote:
Originally Posted by Strange Dog View Post
I thought that Wee's had carbs until 2006 after which they got efi. Or am i misunderstanding something?
You are misunderstanding something. All V-Stroms, 650 or 1000, are fuel injected.

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post #7 of 14 Old 08-01-2011, 10:03 AM
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your 4-banger's EFI could be in need of an adjustment too......

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post #8 of 14 Old 08-01-2011, 05:11 PM
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Adjusting throttle cables for as close to zero free play is a help. Adjusting the throttle position sensor to switch at about 1400 to 1700 rpm is a help. G2's Street Tamer Throttle Tube is a help. Just getting used to the system is a big help.

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post #9 of 14 Old 08-01-2011, 05:35 PM
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Just curious, but how do you adjust the TPS. Guess i need to read through the manual again.

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post #10 of 14 Old 08-01-2011, 06:26 PM
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To adjust the TPS --
--Buy a T25 tamper-proof torx bit
--Warm the engine
--Raise the tank
--Find the TPS just above the throttle on the rear throttle body (round gizmo with two wires)
--Loosen and lightly retighten the T25 screws (2 up to 2006; 1 after that).
--Put the jumper wire in the diagnostic connector red/white & black/white connections (someone hurry and correct me if I'm wrong)
--Start the engine (previously warmed)
--Note the display. On the clock line you'll have --C00. Or maybe the "--" is low or high.
--Open the throttle until you're holding about 1500 rpm.
--Move the TPS as little as you can against its loosened screws so the "--" marks just go high.
--Tighten the T25 screws. Idle, speed up slightly, and note the change rpm. Adjust as needed.
--Double check the tightened T25 screws. Remove the jumper wire. Put everything back together.
--Ride. Enjoy.

"Older people who are reasonable, good-tempered, and gracious will bear aging well. Those who are mean-spirited and irritable will be unhappy at every period of their lives.

"Let each of use properly whatever strengths he has and strive to use them well. If he does this, he will never find himself lacking."

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