Fazer cutting out - Any help appreciated !

[maniaka]

Hello All

Time for me to pop up out of nowhere from the lurkers and ask for help again.



My luck with my bike has been abysmal of late. Over the past few months I had a sheared spark plug !!



clutch slipping :/



 a snapped chain and a whole other list of heart aches ... I've finally got her running however she keeps cutting out and not starting very occasionally.

So ... starts and rides fine. Occasionally there will be a small jolt from riding [almost as if the bike lost power for a second then came back on]. Other times whilst riding it will be fine but when I come to a stop it will cut out. The bike is occasionally hard to start however this only seems to occour after riding for a bit, so the bike is warm ish.

After the bike has a tantrum and cuts out, restarting it results in turning over but no combustion... happens in neutral [so rules out side stand and killswitch]. After 1 - 10 minutes it usually starts again .. can vary. No apparent changes in power, no loss of power at high revs [not starved of anything, no kinked pipes or faulty fuel pumps].

My bet initially is the HT leads or coil overs ... but I wonder why they would be so intermittent with their faults

I am on the verge of entering my final year of my master degree and am running out of spare time to tinker ... *sigh*

I will dive into the electrics tomorrow and see If I can find anything obvious. Does does anyone have any initial hunches ? Cheers in advance !

[sinto]

Hi, did this happen before the spark plug problem or after you put new plugs (presuming you changed all four)?

[maniaka]

This actually was happening before the spark plug problem, the spark plugs were my first guess so replaced them [all 4 are now replaced]

[sinto]

Ok....
All the plug gaps correct?
All the ht leads on tight and in correct order? Really easy to put the wrong lead on the wrong plug, causing firing problems with order etc which will cause you to never get the engine running correctly and throws everything when your trying to sort it.

[maniaka]

I didn't check plug gaps from the new plugs

Orders definitely right, even got the little numbers in order to prove it when it does run (which is 90% of the time) it runs sweet and smooth with good pull, not lumpy.

[sinto]

I didn't check plug gaps from the new plugs

You have to get them checked

Orders definitely right, even got the little numbers in order to prove it when it does run (which is 90% of the time) it runs sweet and smooth with good pull, not lumpy.

Recheck all leads are secure on both ends once you've checked the gaps.

[darrsi]

Water in fuel tank?

[His Dudeness]

It could be an intermittent electrical fault like a loose connection somewhere  or a reg/rec fault that's happening when it gets hot but just because you've got full power at the upper end of the revs doesn't mean it's not starved of fuel at the lower end so I wouldn't rule out a fuel supply or carb issue yet. When it starts how's the idle? When its not starting have you ever taken out the plugs and tested them for spark? Or checked if they're wet or dry? Another thing to check when it's running is the temperature of each header by throwing some water on them and seeing if they dry at the same rate. If one dries slower than the others it points to that cylinder having the issue then you can investigate if it's a fuel or electrical problem

[joebloggs]

It could be an intermittent electrical fault like a loose connection somewhere  or a reg/rec fault that's happening when it gets hot but just because you've got full power at the upper end of the revs doesn't mean it's not starved of fuel at the lower end so I wouldn't rule out a fuel supply or carb issue yet. When it starts how's the idle? When its not starting have you ever taken out the plugs and tested them for spark? Or checked if they're wet or dry? Another thing to check when it's running is the temperature of each header by throwing some water on them and seeing if they dry at the same rate. If one dries slower than the others it points to that cylinder having the issue then you can investigate if it's a fuel or electrical problem

I find putting the tip of my penis on the headers is a good way of indicating which is the hotest.............

[maniaka]

It could be an intermittent electrical fault like a loose connection somewhere  or a reg/rec fault that's happening when it gets hot but just because you've got full power at the upper end of the revs doesn't mean it's not starved of fuel at the lower end so I wouldn't rule out a fuel supply or carb issue yet. When it starts how's the idle? When its not starting have you ever taken out the plugs and tested them for spark? Or checked if they're wet or dry? Another thing to check when it's running is the temperature of each header by throwing some water on them and seeing if they dry at the same rate. If one dries slower than the others it points to that cylinder having the issue then you can investigate if it's a fuel or electrical problem

Good idea with the water I'll try it later ... I usually just tap it with my eyes closed screaming like a woman to see if its hot.


I will check through some connection later when I'm home from the library  - I did have a problem a few months ago where the ignition barrel connection in the little black box under the tank has melted and caused the whole system to go dead !

[His Dudeness]

It could be an intermittent electrical fault like a loose connection somewhere  or a reg/rec fault that's happening when it gets hot but just because you've got full power at the upper end of the revs doesn't mean it's not starved of fuel at the lower end so I wouldn't rule out a fuel supply or carb issue yet. When it starts how's the idle? When its not starting have you ever taken out the plugs and tested them for spark? Or checked if they're wet or dry? Another thing to check when it's running is the temperature of each header by throwing some water on them and seeing if they dry at the same rate. If one dries slower than the others it points to that cylinder having the issue then you can investigate if it's a fuel or electrical problem

Good idea with the water I'll try it later ... I usually just tap it with my eyes closed screaming like a woman to see if its hot.


I will check through some connection later when I'm home from the library  - I did have a problem a few months ago where the ignition barrel connection in the little black box under the tank has melted and caused the whole system to go dead !

Same thing happened to me where a poor connection off the ignition caused the ignition connector to melt and the whole bike shut off dead. But a worn ignition or poor connection off the ignition or even a worn key that's not making good contact in the ignition barrel can cause your symptoms. That's where you should start if it's been an issue in the past. If the problem happens again try jiggling the key in the barrel and see if it comes back to life and if that doesn't work try jiggling the connector coming off the ignition. If it comes back to life then you know that's the problem

[maniaka]

Bike wouldn't start after riding earlier ... turned on and off gave the keys a jiggle and they came right out of the barrel (in on position) guessing you were right about a poor connection.  Guess this could be the main issue (or another one too add to the list )

[fazersharp]

On a side note ---- do you Actually  live in Coronation Street ! And whats on your head.

[maniaka]

Haha that made me chuckle. That's an old Plymouth backstreet and I have no idea what's on my head ... Some kind of lesbian velcro spaceship if I'd had to guess O.O

[His Dudeness]

Might be worth getting a new barrel or you could try getting a key cut off the fuel tank

[Val]

Too much info here...tldr;

The bike is occasionally hard to start however this only seems to occour after riding for a bit, so the bike is warm ish.

After the bike has a tantrum and cuts out, restarting it results in turning over but no combustion... happens in neutral [so rules out side stand and killswitch]. After 1 - 10 minutes it usually starts again .. can vary. No apparent changes in power, no loss of power at high revs [not starved of anything, no kinked pipes or faulty fuel pumps].

Hello Maniak

I hope you have read your own very accurate description of the issue 

Because when I read it there is no way this is an electrical fault. You have said it turns over all the times and it happens only when hot.

I bet my bottom dollar that is fuelling issue.

Means start with the tank. Looking for issues with the fuel supply. Next the carb.

I am afraid that carb for me means some proper mechanic fiddling jets and some other gadgets there that I cannot give you any sensible advice 

I nie yademe bonboni tic-tac i pushim cigari Kent 

[Jules-C]

Carry a spare spark plug in your pocket, then the next time it does it you can quickly check if it's sparking or not.

Check the choke cable and mechanism on the carbs to make sure it isn't holding choke on which even slightly

[BBROWN1664]

next time it happens open the fuel cap carefully and listen for a hiss as you open it. (it wont be very loud).

My money is on kinked breather pipes at the moment.

[His Dudeness]

Too much info here...tldr;

The bike is occasionally hard to start however this only seems to occour after riding for a bit, so the bike is warm ish.

After the bike has a tantrum and cuts out, restarting it results in turning over but no combustion... happens in neutral [so rules out side stand and killswitch]. After 1 - 10 minutes it usually starts again .. can vary. No apparent changes in power, no loss of power at high revs [not starved of anything, no kinked pipes or faulty fuel pumps].

Hello Maniak

I hope you have read your own very accurate description of the issue 

Because when I read it there is no way this is an electrical fault. You have said it turns over all the times and it happens only when hot.

I bet my bottom dollar that is fuelling issue.

Means start with the tank. Looking for issues with the fuel supply. Next the carb.

I am afraid that carb for me means some proper mechanic fiddling jets and some other gadgets there that I cannot give you any sensible advice 

I nie yademe bonboni tic-tac i pushim cigari Kent 

It might be an electrical fault. It could be turning over and not sparking if the ignition is not making all the contacts. He needs to take out the plugs when it's not starting and test for spark and visually see if they are wet or dry.

[joebloggs]

Only problem with checking for wet plugs is cylinder temp drying out the plug while your trying to find out which cylinder's not firing. I still think putting his penis on the down pipes would be a better way of determining which pots not firing

[His Dudeness]

Judging from the swelling it's number 3 that's not firing. Now.....off to the hospital

[joebloggs]

Judging from the swelling it's number 3 that's not firing. Now.....off to the hospital

Just remember to ask the nurse to take away the pain but leave the swelling.........

[His Dudeness]

I think we've helped him. Always glad to pass on the bit of biking experience I've had

[maniaka]

Yeah thanks for all the feedback guys I will continue to inspect with all advice given.  Very much appreciated.


Sadly the time I get to spent tinkering is pretty much none. Its currently 2.30 am and I'm in the library designing concrete slabs ... what is life