GT650R won't fire?

**Drew** · 27th June 2013, 19:14

Originally Posted by Confrontation

I have checked all the wiring , nothing seems odd with it , the only thing that has changed since it last ran was the battery and me putting the fairings on it.

Sounds like timing to me.

Get those rocker covers back off, and see if the thing is still timed properly.

I'm assuming the last issue has been resolved with the glowing pipe and shit?

**Confrontation** · 27th June 2013, 21:30

The bike went in for a once over, I was told the compression was tested, timing was checked and the carbs were balanced , new spark plug caps fitted and some little bits and prices were done nothing important .

So most things people are suggesting I think have been covered.

Any opinions or ideas feel free to tell, cos I'm lost

**Confrontation** · 27th June 2013, 21:47

Could in be the vacuum on the rear cylinder?? No fuel going through.
Is it possible to put the vacuum hose to the front cylinder as it's only capped off?

**unstuck** · 27th June 2013, 21:56

When you say checked all the wiring, does that mean you have pulled apart all connectors and joints and done continuity tests and stuff, or just had a sort of wiggle and looksee?

**Confrontation** · 28th June 2013, 06:41

Originally Posted by unstuck

When you say checked all the wiring, does that mean you have pulled apart all connectors and joints and done continuity tests and stuff, or just had a sort of wiggle and looksee?

The wiggle and looksee test

**Motig** · 28th June 2013, 07:53

Originally Posted by Confrontation

The bike went in for a once over, I was told the compression was tested, timing was checked and the carbs were balanced , new spark plug caps fitted and some little bits and prices were done nothing important .

So most things people are suggesting I think have been covered.

Any opinions or ideas feel free to tell, cos I'm lost

So was that taking it back after the original service to get them to remedy their possible errors or what they did in your 1st service ? Why are you doing all this fiddling around yourself if the bike packed up after the servicing ?

**unstuck** · 28th June 2013, 08:07

Originally Posted by Confrontation

The wiggle and looksee test

Unless you have an experienced eye, most of the time that sort of a test wont tell you much.

**Drew** · 28th June 2013, 09:05

If the bike didn't run on engine start, your problem is NOT fuel related. At least the biggest issue isn't.

**Confrontation** · 28th June 2013, 18:53

Originally Posted by Drew

If the bike didn't run on engine start, your problem is NOT fuel related. At least the biggest issue isn't.

I found the worksheet they did , it was saying they couldnt balance the rear carb , maybe a vacuum issue.

From what I gather is that the vacuum on the rear cylinder is used to suck the gas through the pump to feed both front and rear cylinders , am i right? If so, how can he not be able to balance up both carbs ?

**Drew** · 28th June 2013, 19:03

Originally Posted by Confrontation

I found the worksheet they did , it was saying they couldnt balance the rear carb , maybe a vacuum issue.

From what I gather is that the vacuum on the rear cylinder is used to suck the gas through the pump to feed both front and rear cylinders , am i right? If so, how can he not be able to balance up both carbs ?

Depends what they meant by balance the carb.
Scan it and post it up.

The vacuum line opens the tap. It's doesn't suck fuel, the fuel is gravity fed on those bikes I think.

Depends what they meant by balance the carb.

**Confrontation** · 28th June 2013, 20:53

Originally Posted by Drew

Depends what they meant by balance the carb.
Scan it and post it up.

The vacuum line opens the tap. It's doesn't suck fuel, the fuel is gravity fed on those bikes I think.

Depends what they meant by balance the carb.

Scan?? gee who has a scanner these days lol , I think he was meaning balancing carbs to get the right mix in each carb , he did ask me in to check it out , what I seen was he had a set of gauges hooked up , I seen the front was measuring 20 ( not sure if it was kpi , bar or psi) and the back was only 10 , he said he cant adjust the back anymore then what it was.

All I cant understand is what happened between the time I picked the bike up and drove less then 5 minutes down the road for it to cut out.
I figured it was just the battery , so I left it a couple days put on the fairings then put a fully charged battery in and fired it up , all it done was back fire then not fire after that.

So far what I have gotten from this forum and ringing places here is that If Im getting a spark its not electrical so must be fuel then... , BUT if the either isnt making it fire then its not fuel.

So if its not electrical or fuel then its mechanical if so...where do I look? (I dont think its mechanical)

**jellywrestler** · 28th June 2013, 21:00

Originally Posted by Drew

If the Pulse generators are doing their thing, and the coils aren't getting a message, you are likely looking at a new ECU. Borrow one first though, to eliminate a wiring fault.

yep an if there's a fault that cooked the ECU to fail then yours is fucked and the one you've borrowed...

**Drew** · 28th June 2013, 21:02

Originally Posted by Confrontation

So if its not electrical or fuel then its mechanical if so...where do I look? (I dont think its mechanical)

You're out of options then I'm afraid.

I would check electrical timing because it's easier. If that's OK, get the rocker covers off and check the cam timing.