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Discussion Starter #1
Hi guys.
Need some help.
Only had a stripped down bike for a couple of months.
Rode it about 100 miles over the weekend. Left it parked up in garage.
One week later, it simply won't start. Sounded like putt putt putting on one or two cylinders.
All electrics seem to be all working. Neutral light on. Turns over strongly.
Oil pressure switch wire had come off but I've put a new connector on and refitted.
Taken tank off and checked HT leads and plugs. All look good.
Put auxiliary fuel tank straight to carbs.
Checked fuses.
Not firing on any now.
Any sensors or switches that would stop it firing?
ECU.? Hope not only had it a few weeks. Am I that unlucky? Hmmmm.
Thanks in advance.
 

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Discussion Starter #2
I'm now thinking ECU or ECU signal sender.
Found ECU but where is sender located on this bike?
Or any other thoughts? Thanks
 

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Welcome.

Try www.carlsalter.com for a service manual for that bike. It should help you with component location and testing.

Even if you can't find the exact manual, check one for a similar year and model. Suzuki is pretty good keeping things pretty standard between many models.
 
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Technically this bike doesn't have an "ECU", it has an igniter. Have you checked for spark? my guess is the carbs are wasted, and need a good cleaning, and rebuild. Start with spark if it ran a couple weeks ago, then go with fuel. Shoot a little ether, or carb cleaner (the extremely flammable, not the Gunk shit), and see if it's a fuel issue. You mentioned an external fuel source, so likely not the petcock, YET... Again, make sure your getting spark on ALL cylinders.
 

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Discussion Starter #5
Hi guys.
T thanks for getting back.
Some progress.
Put a spare spark plug in 3 of the ht. leads.
Getting second from left is a complete bigger. But all 3 others gave a good spark.

Soo that does leave fuel or compression.
Can't be compression. I hope.

So fuel... It's fresh fuel, 4 weeks old.

Must tell you I have had the carbs off. It was running rich so I checked t the floats.
They were miles out.. So set them horizontally with the carb tops.
Ran so much better.
Did a 100 miles.
One week later will not start.
Can't understand it!
Thanks
 

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SuperMod of the North
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Have you checked the vacuum line that goes to the petcock? If you turn your petcock pointing down it will free flow. If it starts facing down but not pointing left or right it is the vacuum supply to the petcock.

Like Spyder said, spray some WD40 or something in the carbs while you crank and if it goes it is a fuel issue.
 

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Discussion Starter #7
Will try carb cleaner.
But fuel is straight from external fuel tank. So bypassing petcock.

I just don't understand how fueling can change whilst parked in garage for a week. Bizarre.
Thanks anyway. Karl.
 

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SuperMod of the North
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Ah, yeah, petcock isnt the problem. Have you checked the choke assy?
 

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Discussion Starter #9
I haven't got a choke assembly.
Just a ring pull on end of carb rack.
Moves ok and springs back.

Is it easy to post pics on here?
 

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SuperMod of the North
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Yup. Click the postcard looking picture on the bottom of the reply window and follow the prompt. That or right click on an image on the web and copy the image address. Toss it in and if it screws up I will try to fix it.
 

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Discussion Starter #11 (Edited)
Okay. This is making no sense to me.
Checked all ht leads with spare spark plug resting on engine.
Could see a spark on all leads.

Took air filters off.

Sprayed carb cleaner into carbs, whilst hitting starter button.

Absolutely nothing.

The only logic I see is that all 4 plugs packed up simultaneously.

Is that even possible.?
Can there be a weak spark.?
Strong enough for me to see easily butt not enough to light gas or carb cleaner?
Dirty connection? Where to clean?
Thanks again.
 

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Possibly have your coils backwards? when you pull your plugs, are they wet?
 
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