Random Misfire sounds almost like air leak

[jamman]

Thanks for the info .. will pull the tank and replace the vac hose with fuel line and an elbow and see how it runs

[jamman]

Redid the vacuum lines with fuel line made sure none are pinched ... no change ...

When its cold idles ok right at 1000 RPM when pulling in the clutch to stop ... when it gets good and warmed up dives to 200-300 rpm and sometime recovers slowly back to 1000 RPMs but most of the time it dies unless I let the engine slowly wind down coming to a light before pulling in the clutch ..

I remember when I first got TuneECU going I changed the IACV setting by accident I think it was -2 if I remember correctly and it is set to 0 now .. not sure if that could affect this ...

Any suggestions are welcome thanks much !

[JoeDirt]

Sorry the fuel hose didn't do the trick...

Other things to check:

Fuel - How long have you had your fuel? Has it sat for a while allowing water to condensate?
Spark - Have you checked your spark plugs and set the gap?
             Are you getting 12v+ when running?
Air - Throttle bodies might need sync'ed.
        http://www.tigertriple.com/forum/index.php?topic=6473

One more thing, is there a lot of slop in your throttle cable before you "rev" up? Might need adjusted.

[Timbox2]

Redid the vacuum lines with fuel line made sure none are pinched ... no change ...

When its cold idles ok right at 1000 RPM when pulling in the clutch to stop ... when it gets good and warmed up dives to 200-300 rpm and sometime recovers slowly back to 1000 RPMs but most of the time it dies unless I let the engine slowly wind down coming to a light before pulling in the clutch ..

I remember when I first got TuneECU going I changed the IACV setting by accident I think it was -2 if I remember correctly and it is set to 0 now .. not sure if that could affect this ...

Any suggestions are welcome thanks much !

Well, thats the same problem I had with the last Tiger and in the end I had to replace the stepper motor. But, I hadnt messed with the Tune ECU setting so maybe you can recover it, but Im not sure how. Thing is, when started from cold the motor should sit at anywhere between 2000 and 1500 revs depending on temperature and then slowly drop to 1200 as it warms up, how cold is it where you are at the moment? If you just turn the ignition on and off do you hear the stepper cycling? Oh, and dont be tempted to dismantle the stepper assy, it will end in tears.

[Chris Canning]

As Bixxer's has said a billion times on here F about with these things at your peril,I put a new stepper on mine last year with new pipe and a balance even after 500 miles it was still sorting itself out and got better every time I rode it.

[Bixxer Bob]

I can't remember what you have and haven't done so sorry if I'm repeating myself.

Throttle bodies need to be balanced (not part of this issue but is key to getting them running right, and a bugger to do if they're not.  I don't faff with trying to hold 2k revs on the throttle while doing them, I fit T pieces with an additional piece of pipe so the IACV is connected as well as the balancer the whole time.  You get a more accurate result because the throttle bodies are closed as they should be and you are only balancing the IACV flows.  And I know that is done by cracking the TBs open slightly but you get my drift).


Using TuneECU cycle the IACV with the engine off and listen for it cycling. If the tank is off it watch it, should move smoothly through out it's range.

The stepper setting should be around 35 steps.  Make a note of what it is before you start, try setting it at 35 first (bearing in mind -2 to 35 is a masssive jump) and see what happens.  When it's right blipping the throttle will have a clean pick up without bogging and overrun shouldn't pop and bang too much.  If 35 is nearly right only change a couple of steps at  time because it only needs small changes.  It could be it's trimmed itself down to -2 due to the pipe problem.

[jamman]

Thanks

Where is the stepper setting in tuneECU ?

[JoeDirt]

Thanks

Where is the stepper setting in tuneECU ?

Highlighted... not arrow.

[jamman]

so I should set the IACV to 35 ? It  was set to 0

[JoeDirt]

only change a couple of steps at  time because it only needs small changes.

I would say what Bixxer Bob says...

[Dev_1]

Redid the vacuum lines with fuel line made sure none are pinched ... no change ...

When its cold idles ok right at 1000 RPM when pulling in the clutch to stop ... when it gets good and warmed up dives to 200-300 rpm and sometime recovers slowly back to 1000 RPMs but most of the time it dies unless I let the engine slowly wind down coming to a light before pulling in the clutch ..

I remember when I first got TuneECU going I changed the IACV setting by accident I think it was -2 if I remember correctly and it is set to 0 now .. not sure if that could affect this ...

Any suggestions are welcome thanks much !

I'm having the same issues... almost like the bike hiccups after warmed up and sitting at idle or coasting. I too have replaced the vacuum lines, installing an elbow isn't a bad idea. Have been leaning towards replacing my coils. 
Can't seem to get TuneECU to work... maybe because the headlight fuse also kills the fuel pump (as I've read here).

Watching this thread very closely. 

[Bixxer Bob]

so I should set the IACV to 35 ? It  was set to 0

Sorry mate,been offline for a while.  Yes, adjust toward 35 in small steps.  It should work out to be around 35.  The optimum is when you blip the throttle and the revs pick up cleanly without hesitation and drop back to idle without too much popping.  One side of optimum it'll bog  before picking up and drop back smoothly, the other side of optimum it'll pick up cleanly but pop abd bang dropping back.

AS always, make a noteof take a phot of the readings before you start so you can go back to them if necessary.

[jamman]

All

Yes adjusted up to 35 and it runs great !! idles nicely now no more issue ...

Enjoying the ride once again !!

Thanks everyone especially Bixer for the help !!!

Gary

[Bixxer Bob]