GT650R won't fire?

[Confrontation]

took my bike in to be tuned up , went to pick it up had to jump it from a battery pack (I think I have a charging problem) got the bike home , parked it in the shed for 2 days.
Put the fairings on yesterday popped in the battery from the 250cc went to fire her up.....one big popping backfire and now she wont fire up.
The engine is turning over just seems like the plugs are not sparking.

Any ideas what I need to be checking out?
I plan on taking out the plugs to see if the spark , anything after that Im not sure what to do.

[Drew]

Could be as simple as a blown fuse, and as difficult as a fucked CDI.

All manner of things in the middle too of course.

[Confrontation]

what things in the middle? I have checked the two fuses under the pillion seat , they are ok.

[98tls]

Fuel mate,is it carbd and if so no doubt it has a drain plug,undo it and see what comes out.

[Drew]

what things in the middle? I have checked the two fuses under the pillion seat , they are ok.

Start testing then I'm afraid.

Check to see if there's spark at the plugs. Followed by checking if the coils are getting signal, (not as easy as it sounds. As the CDI earths the coils normally, untill it's firing time when they stop the earth signal so the current must discharge through the plug instead). Then check that the pulse generators are doing what they do, (this one's simple as they just produce a charge when the pickup goes by).

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.

[Confrontation]

Fuel mate,is it carbd and if so no doubt it has a drain plug,undo it and see what comes out.

Yes it is carbed , just got it back from the shop after a tune up , Im sure they have checked all the fuel and stuff like that.

[Motig]

If it was running reasonably OK before the tune up and isn't now do you think perhaps something was botched during the tune up maybe ? Just saying :sweatdrop

[nzspokes]

Yes it is carbed , just got it back from the shop after a tune up , Im sure they have checked all the fuel and stuff like that.

I would be ringing them and asking if they may have left something lose.

[AllanB]

Ah ........ why have you not called the shop who tuned it up?

Don't fuck about with it or piss about online - call the shop.

After you have checked the kill switch and made sure the tank has fuel in it ..........

[98tls]

Yes it is carbed , just got it back from the shop after a tune up , Im sure they have checked all the fuel and stuff like that.

:oi-grr:What a lovely place you live in.

[98tls]

Start testing then I'm afraid.

Check to see if there's spark at the plugs. Followed by checking if the coils are getting signal, (not as easy as it sounds. As the CDI earths the coils normally, untill it's firing time when they stop the earth signal so the current must discharge through the plug instead). Then check that the pulse generators are doing what they do, (this one's simple as they just produce a charge when the pickup goes by).

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.

Beam me up scotty...this guy still believes that people employed in a motorcycle shop actually know anything about motorcycles.

[Drew]

Beam me up scotty...this guy still believes that people employed in a motorcycle shop actually know anything about motorcycles.I do sort of.

[The Reibz]

Sounds like the ignition fuse might have blown. Happened to me before, massive back fire followed by nothing when the starter is pushed.


After you have checked the kill switch and made sure the tank has fuel in it ..........
And do what he said...

[Rhys]

Beam me up scotty...this guy still believes that people employed in a motorcycle shop actually know anything about motorcycles.

They might not know everything but they know more than me !

[Confrontation]

Sounds like the ignition fuse might have blown. Happened to me before, massive back fire followed by nothing when the starter is pushed.


And do what he said...

What is meant by checking the kill switch?? , I have checked the two fuses under the pillion seat , they are all fine , I cant see where any other fuses are , only the 4 relays under the seat.

I have put more fuel in the tank and checked the plugs and they are sparking.
It is possible to get the CDI check right?

[Pumba]

Kill switch on the handle bar. Normally red and quite large. Make sure it is set to run, or on, or something like that.

Might be worth checking the side stand cut out switch as well on the off chance it has failed

[Pumba]

If you have spark it is not your electrical system (unless the spark is weak). The fore start looking at the carbs. Spray a bit of engine start in there and see if it fires.

If it does, but does not continue to run then you have a fuel issue.

[kiwi cowboy]

I do sort of.

Sort of work in a mc shop?.:girlfight::lol:

[Drew]

Sort of work in a mc shop?.:girlfight::lol:God no! I'd be homicidal in no time dealing with cracker ass crackers, who can't describe what their bike does, but expect it fixed for fuck all.

[duckonin]

God no! I'd be homicidal in no time dealing with cracker ass crackers, who can't describe what their bike does, but expect it fixed for fuck all.

On the other hand, one can describe exactly what their bike does, but tec says, "no thats not the problem" and charges fucken heaps and still never got it right. Cunts don't listern most of the time.

[Drew]

On the other hand, one can describe exactly what their bike does, but tec says, "no thats not the problem" and charges fucken heaps and still never got it right. Cunts don't listern most of the time.

The mechanics at the shop I frequent, I know quite well. Even though I've never taken a bike to them. I imagine they would look into my idea before going in their own direction.

But they are friends, so I guess that makes me kinda different to the situation you suggest.

[nodrog]

But they are friends, so I guess that makes me kinda different to the situation you suggest.

No, that just makes you special.

[Drew]

No, that just makes you special.Don't you have a purple shirt to iron?

[98tls]

I do sort of.

No offense intended D,had to many Bourbons when i typed that and didnt mean to generalise,what i meant was guys in bike shops are well capable of fucking up..me bad.This bike sorted yet?

[nodrog]

Don't you have a purple shirt to iron?

No, I have a wife for that.

[98tls]

Read your last post fella,you can put all the gas you like in the tank you need to see if its getting to the carb,you seem a bit caught up with the plugs so are they wet or dry?

[Drew]

No, I have a wife for that.

I have a wife too, but she is worse with an iron than I am.

[Confrontation]

If you have spark it is not your electrical system (unless the spark is weak). The fore start looking at the carbs. Spray a bit of engine start in there and see if it fires.

If it does, but does not continue to run then you have a fuel issue.

sprayed a bit of engine start , got a bit of a back fire after a couple attempts other then that nothing.
i have no idea what to do now.

I also put the tank on from my 250 just to see if its the cock still nothing , also put the 650's tank on the 250 and it was working fine.

I just have no idea

[Fast Eddie]

I also put the tank on from my 250 just to see if its the cock, still nothing

I don't think you needed to swap fuel tanks to find out if its the cock thats the problem.

if it started and ran before what has changed since it last ran.. if you're mucking about with batteries n stuff then check the battery itself holds good charge and good cca. then check your wiring and electrical components etc.. maybe somethings rooted or shorted out/blown.

could be something completely different too.. ya just never know until you get to testing stuff. take it back to the bike shop.

[Confrontation]

I don't think you needed to swap fuel tanks to find out if its the cock thats the problem.

if it started and ran before what has changed since it last ran.. if you're mucking about with batteries n stuff then check the battery itself holds good charge and good cca. then check your wiring and electrical components etc.. maybe somethings rooted or shorted out/blown.

could be something completely different too.. ya just never know until you get to testing stuff. take it back to the bike shop.


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.

[Drew]

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]

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]

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]

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]

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]

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]

The wiggle and looksee test

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

[Drew]

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

[Confrontation]

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]

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]

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]

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]

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.

[jellywrestler]

[QUOTE=98tls;1130569184are they wet or dry?[/QUOTE] are we still talking about wives here???

[Drew]

are we still talking about wives here???If you had one, we would be.

[jellywrestler]

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

they're only putting a measuring instrument on it to check the vacuum, so there's something wrong in this area if they can't balance them, dunno what it should be but it should be even, i'm surprised they can't give you a scenario on why not.
Not sure about Hyodungs on fuel tap suction, usually bikes have access points on more than one pot and with a longer pipe it can be changed, still doesn't negate you bad balance though
have you thought about a one way trip to a dunedin wharf, and a taxi home? make sure you pay cash for the taxi and wear a Maori Burkha (Balaclava) and don't post it on KB

[jellywrestler]

If you had one, we would be.
I've never been married, I haven't made the same mistake once!

[Confrontation]

I got a feeling the bike stop outside my drive becos it only had enough gas in the carbs to get it that far , I told the bike shop that and they said bring it back in. so we shell see.......

[98tls]

are we still talking about wives here???

Key word here is "obey".

[Motig]

So the problem was ??????

[Confrontation]

So the problem was ??????

Well after taking it back to the shop I was told it was a fucked spark plug ( that was just days old , and cost 30$ ) also he took of the rear cam cover , cam housing and cam followers to find a colic had popped out.

From there I have had a friend check and refit all the velves in the rear head , i have just put the head back on the bike (after waiting for the gasket to turn up from the states)
only for it not to fire up again....

I took the tank off , sprayed some engine start in and the bike fired up , so now Im thinking its a fuel problem.

i cant feel any air coming out the vacuum.

any ideas people?

[Drew]

Vacuum line to th fuel tap? The little hose is the vacuum one.

[Madness]

Well after taking it back to the shop, I was told it was a fucked spark plug (that was just days old , and cost $30). Also he took of the rear cam cover, cam housing and cam followers to find that a collet had popped out.

From there I have had a friend check and refit all the valves in the rear head. I have just put the head back on the bike (after waiting for the gasket to turn up from the states), only for it not to fire up again...

I took the tank off, sprayed some engine start in and the bike fired up, so now I'm thinking its a fuel problem.

I can't feel any air coming out the vacuum.

Any ideas people?

Air doesn't normally come out of a vacuum line, it goes in. Just like the hose on a vacuum cleaner really.

Another suggestion might be to go back to school & learn how to spell.

[Confrontation]

Air doesn't normally come out of a vacuum line, it goes in. Just like the hose on a vacuum cleaner really.

Another suggestion might be to go back to school & learn how to spell.


I don't need to know how to spell , and fuck you.

[Madness]

I don't need to know how to spell , and fuck you.

You really do you know. You're welcome :niceone: