More Help Needed!

CountryBoy · Post by **CountryBoy** » Tue Jun 06, 2006 9:37 am

Sorry to bother you all again but i'm having no joy with my running problems at high revs (see earlyier posts).
I've now changed the plugs and leads, checked all hoses and pipes etc are connected to the carbs correctly, checked the diaphram in the fuel tap, drained the carbs incase of any muck in them, and still no joy!,
Any other suggestions - coils? , CDI unit? , throttle position sensor?, or anything else you can think of, please help!.

Thanks.

Post by **sirch345** » Tue Jun 06, 2006 12:19 pm

Did you PM 'Stratman' as I suggested in link below

Chris.

http://www.vtr1000.org/phpBB2/viewtopic.php?t=6586

Stormin Ben · Post by **Stormin Ben** » Tue Jun 06, 2006 12:21 pm

Oh dear.
Next stop rectum-fryer??

Is the problem speed related (ie only in the upper few gears) or rev related (happens at same revs in every gear)

does sound like an electrical problem which could be
1) Rectifier allowing overcharging which is freaking out the ECU
2) Coils breaking down at high revs -do a search of workshop coz I remember someone else had a similar problem not so long ago
<edit> http://www.vtr1000.org/phpBB2/viewtopic ... light=coil

CountryBoy · Post by **CountryBoy** » Tue Jun 06, 2006 12:34 pm

Stormin Ben wrote:Oh dear.
Next stop rectum-fryer??

Is the problem speed related (ie only in the upper few gears) or rev related (happens at same revs in every gear)

does sound like an electrical problem which could be
1) Rectifier allowing overcharging which is freaking out the ECU
2) Coils breaking down at high revs -do a search of workshop coz I remember someone else had a similar problem not so long ago
<edit> http://www.vtr1000.org/phpBB2/viewtopic ... light=coil

Ben,
Seems to be all gears but the same area in the rev band everytime, what does that tell me?

Stormin Ben · Post by **Stormin Ben** » Tue Jun 06, 2006 1:20 pm

Its not fuel related then. Sadly, thats about all

Does it make a difference if you have the lights on or off?

Is it large or small throttle openings? ie can you gently coax it up to the higher revs if you don't have the throttle wide open?

What revs is it at?

CountryBoy · Post by **CountryBoy** » Tue Jun 06, 2006 2:06 pm

Stormin Ben wrote:Its not fuel related then. Sadly, thats about all

Does it make a difference if you have the lights on or off?

Is it large or small throttle openings? ie can you gently coax it up to the higher revs if you don't have the throttle wide open?

What revs is it at?

Ben,
Have'nt tried it with lights off as mine are normally on, how will that make a difference?

If you coax the revs up its alot better, whilst the problem is happening if you relax the throttle a little it gets better but not perfect, always seems to happen from around 6.5 thou and up.

Squiffythewombat · Post by **Squiffythewombat** » Tue Jun 06, 2006 4:25 pm

i dont know if this is going to help or not butttttt:

I had exactlly the same problem on the ZXR, turned out to be coils and rectifier. You can test both with a multimeter, if you dont have a haynes, let me know and i will post the tables.

CountryBoy · Post by **CountryBoy** » Tue Jun 06, 2006 4:37 pm

Squiffythewombat wrote:i dont know if this is going to help or not butttttt:

I had exactlly the same problem on the ZXR, turned out to be coils and rectifier. You can test both with a multimeter, if you dont have a haynes, let me know and i will post the tables.

Yes i've got a haynes, is it tricky to do?

Stormin Ben · Post by **Stormin Ben** » Tue Jun 06, 2006 5:06 pm

If the rectifier is putting too much voltage into the system tehn having the lights on will be draining some of that
If you turn the lights on and it gets worse, you're on the right track

Testing the rectifier is simple -
Remove seat
Access battery terminals
Start bike
Measure voltage across terminals **
Rev bike and measure voltage
It shouldn't rise by more than ##

I don't know the exact figures off the top of my head but I think ** is 12.8V and ## is about 0.5v
If the voltage goes too high the rectifier is on the way out.
Change it ASAP before it kills your battery

Can't recall how to test the coils off the top of my head

Have you made sure all the connectors to earth are good?
Its possible a bit of crap has got in there and if it isn't earthing properly the spark can be degraded -hence poor running

Beast · Post by **Beast** » Tue Jun 06, 2006 11:29 pm

I would suggest to test the R/R as in the method Stormin Ben has suggested.

If all is well, i would maybe say the coils are breaking down under load.
Can you borrow a set of anyone for testing?

Squiffythewombat · Post by **Squiffythewombat** » Wed Jun 07, 2006 9:51 am

I have the manual as a .pdf so will post the diagram tonight- it might help others later on down the line!

Testing the coils on my ZXR was really easy, a simple resistance test across the two points and check off against testing chart. I persume its the same process for the VTR just with differenet values!

As ben says, a fried rec will result in a dead battery quite quickly, believe me i know!

There was a test that as you rev your engine you should see an increase in the brightness of the lights, if not then somethings not right! (although im not sure if this was an alternator test?)

If the earth has crap it in it, would it not throw off the whole rev range not just a specific band as the spark would be inconsitant all the way through?

Stormin Ben · Post by **Stormin Ben** » Wed Jun 07, 2006 4:02 pm

Squiffythewombat wrote:If the earth has crap it in it, would it not throw off the whole rev range not just a specific band as the spark would be inconsitant all the way through?

Think its to do with the resistance of the circuit to earth
At lower revs there's enough time for the electricityness to get through the crap and down to earth
At higher revs the electricamybobsit doen't have time to reach earth before the next load comes along
I think

gcs · Post by **gcs** » Thu Jun 08, 2006 8:20 am

I had prob with coil, but the bike ran rough thru all the rev range, making it impossible to start at the end (which is when i trailered it home). Workshop tested everything possible to test ( started doing same tests over and over) but could not find prob untill they took parts off another bike , one by one, till the prob solved. No one expected coil to play up, especially when it TESTED ok.

Squiffythewombat · Post by **Squiffythewombat** » Thu Jun 08, 2006 10:23 am

Stormin Ben wrote:
Squiffythewombat wrote:If the earth has crap it in it, would it not throw off the whole rev range not just a specific band as the spark would be inconsitant all the way through?
Think its to do with the resistance of the circuit to earth
At lower revs there's enough time for the electricityness to get through the crap and down to earth
At higher revs the electricamybobsit doen't have time to reach earth before the next load comes along
I think

LOL @ electricityness!

I would imgaine that its more how much electrictyness is going through rather than time. The faster the engine revs, the more currant is generated by the alternator, therefore a larger amount of electricy trying to go through, thus at lower revs there is less so it gets through. Either that or its reversed and to do with the draw...

/\ educated guess anyway!

RE: diagram, i fell alseep at 5pm yesterday and woke up for work today so havent had a chance to look yet, sorry