'07 Wee Strange Cutting Issue - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 9 Old 07-22-2019, 05:19 PM Thread Starter
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'07 Wee Strange Cutting Issue

Hello gents,

I wish this wasn't my first post to the forum, but I'm seeking some help on an issue that has me a little stumped.

This problem first manifested itself last summer as what seemed to be a fuel-cutting issues. A removal and cleaning of the fuel filter seemed to do the trick, and the bike was back to normal.

Recently, it began to manifest the same issue: occasional cut-outs while riding, that could normally be resolved by pulling in the clutch, and giving the bike a second. It seemed to mostly manifest around the 4-5k. Then it suddenly got worse, to the point the bike will not run.

But here's the weird part. If I lean the bike around 25* to either side, it starts, runs and revvs perfectly. I have cleaned the fuel filter and checked fuel flow. One other symptom I was having was that the bike would frequently die at a stop.

In the research I have done, I have seen several people with similar cutting issues, and have seen several suggestions:

Spark plugs/ plug wires
TPS adjustment/replacement
Tipover sensor malfunction
Injectors
Weird electrical gremlin.

I would really appreciate some insight before I dive into this thing. The TPS seems suspect because of it dying at stops, but I have a hard time seeing how that would cause an orientation-related problem. The tipover sensor makes sense for orientation, but I have yet to see any other reports of a similar issue.

Anyway, I'd appreciate any advise for making a plan of attack.

Thanks!

Sam
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post #2 of 9 Old 07-23-2019, 02:27 PM
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The TPS works like a rheostat. It tells the ECU where the throttle setting is. As it gets worn debris builds up inside & shorts the signal. The ECU "thinks' the throttle is at a different position than it actually is. It is a semi-common issue. I did the resistance sweep on mine & it always remained linear. Inconclusive. After eliminating some things, I replaced the lower TPS. Fixed. I'm not saying this is your problem. I've provided this information to help you decide where to go.
You said you "Checked fuel flow"? How? you'll need to do a VOLUME/TIME test per the manual specs.
What did the fuel screen look like when you cleaned it? Was it dark brown & dirty?
Is your clutch switch working properly?
What is the base idle speed?
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post #3 of 9 Old 07-23-2019, 02:46 PM
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Quote:
Originally Posted by Backwoods_wanderer View Post

In the research I have done, I have seen several people with similar cutting issues, and have seen several suggestions:

Spark plugs/ plug wires
TPS adjustment/replacement
Tipover sensor malfunction
Injectors
Weird electrical gremlin.

I would really appreciate some insight before I dive into this thing. The TPS seems suspect because of it dying at stops, but I have a hard time seeing how that would cause an orientation-related problem. The tipover sensor makes sense for orientation, but I have yet to see any other reports of a similar issue.

Anyway, I'd appreciate any advise for making a plan of attack.

Thanks!

Sam

I'm going with the Gremlins.

Seriously, dude...that's a crazy problem. Did you say that it always manifests between 4 - 5k? If so is the bike centered during that time?

Regards,

Sage77
*Proud owner of my 5th motorcycle, although it's the only one I still have. We'll get into those stories later....*
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post #4 of 9 Old 07-24-2019, 09:33 PM
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I would follow the advice of Solo to start with.

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post #5 of 9 Old 07-24-2019, 10:28 PM
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Quote:
Originally Posted by Backwoods_wanderer View Post
.

Spark plugs/ plug wires
TPS adjustment/replacement
Tipover sensor malfunction
Injectors
Weird electrical gremlin.
Side Stand Switch

The tipover sensor makes sense for orientation, but I have yet to see any other reports of a similar issue.
I remember there were some strange things happening caused by the sidestand switch. Can't remember the story if it was boots hitting the sidestand or a weak spring or what. So just make sure that's not it.

I would go with the tipover switch. There was at least one report I remember where that switch caused grieve! Check how it works and bypass it to prove/ disprove that switch.

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post #6 of 9 Old 07-24-2019, 11:31 PM
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The stand switch can cause issues but only if the bike is in gear, if the bike is in neutral it should play no part so that is another test to go through.


If your clutch switch is bypass it can cause the bike to stall but the 4k to 5k problem sounds like lack of fuel or poor quality fuel but then again I could on the other side of the world.

How many keys do you have on your keyring ?

I have a number of times found the problem to be the weight of keys on a ring wearing out the ignition switch on other vehicles.

The first test on any bike is: are your battery terminals clean and tight ? unlike a car a bike will often start with poor connections.

You should then check the big plug on the left side above the radiator, look for loose, corroded or burn terminals.

The area you live can play a part in the answers you get so updating your profile to include location may help.

Some of the 19 rides in my shed
2014 V2, Snoopy
2009 Wee, Pumbaa the pig
WR450F, The Blue Postie Bike
YZ250N smoker with rego, Stinky.
Yamaha MT09 (FZ09), The Scud missile.
Club Lead not Club Med.
He with the most toys wins.
Out of my depth in a puddle.
Live life on the edge you will see more that way.
Ridding a motorcycle keeps things in balance.
At the end of each trail and at the end of each day history is made.

Last edited by Rolex; 07-24-2019 at 11:35 PM.
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post #7 of 9 Old 07-26-2019, 09:59 PM Thread Starter
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Thanks for the replies!

So first thing I learned, is that the 07 and up Vstroms actually need the clutch safety switch for the bike to run properly. I had infact by-passed mine because I was using an aftermarket lever. I started by swapping that back and re-connecting the clutch switch.

Second thing I did was pull the three easily accessible plugs. They were nasty. Two were just very dark/fouled, but one of them had a bit of oil/build up on it. I cleaned them, and am going to buy some new plugs today and swap them. After cleaning the plugs last night, the bike started and ran pretty well. I rode it to work today without incident except for a couple very small hiccups. I'm not convinced I've totally solved teh pro

@Solo

Admittedly my fuel-flow inspection was visual, not scientific. I was mostly looking for steady/strong flow in the upright position, rather than a true volume/time interval measurement. It wouldn't hurt to do that.

The low-pressure fuel was quite dark, and after soaking it in acetone and running some compressed air through it, I got a good amount of fine residue out of it. Nothing crazy, but it was definitely dirty.

I can't confirm base idle speed right now, because I've swapped the dash for a Trail-Tech Vapor, because I decided to go the Thinstrom route after I did some facial destruction to the bike last summer. The tach isn't super accurate on the Vapor.


I don't suspect the stand switch, as the problem occurs in neutral, at idle. At the worst points, I could start the bike on the side-stand, and as soon as I stood it upright, whether at idle, or with a bit of throttle held, it would die. And this was repeatable multiple times.

I did check battery terminals. They are clean and tight, and my battery is only a couple months old.

I did a brief electrical inspection last night, and didn't find any loose, damaged, corroded or otherwise questionable electrical items. Other than my plugs looking very old and crusty, the plug wires were all tight and clean.

I'm going to replace the plugs and keep riding. If the problem persists I will start digging deeper into it.

Thanks for all the input!

Sam
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post #8 of 9 Old 08-05-2019, 04:40 PM
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If I found oily plugs I would do a leak down to confirm cyl/piston okay.
Did this issue start when you removed the OE dash? I ask because some F.I. computers use feedback from it. I DO NOT know if our V-Stroms do, just a thought.
You have verified the proper location of the tip sensor? Have you tried moving it around while it's running?

2007 DL 650 with assorted upgrades
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post #9 of 9 Old 08-06-2019, 04:30 AM
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It sounds like an electrical connector not fully connected or a harness shorting the coils / ecu, like in a kill switch effect. Another thought, check the tip over sensor (TOS). It could have come loose from the mounting position and laying at the wrong angle.
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