todays mad fettle

[D-Rider]

I did give them a quick "once-over" a few weeks back and didn't notice anything. Will look them over again (arse - that's the airbox coming off again to get at the front ones ).

With two plugs per cylinder though, I'd have thought it not so likely .... but I will have another look .... at some point ....

[Aladinsaneuk]

ok, did a few miles this evening, and looked at the backfire situation

my bike backfires between 3500 and 4000 revs with a closed throttle

when i have finished my new exhaust i will look closer, but i think that adjusting the fuel map there will sort it :)

[D-Rider]

OK - similar - maybe a bit further up the rev range but you have a different air box so maybe that would account for some difference.
Does yours run really rough at that engine speed if you are just pootling along on an almost closed throttle - trying to keep a constant speed?

[joecrx]

my bike is standard but it misfires when im low on fuel , only when im at lights and pulling awat just as i let the clutch out , iv got to catch it , i dosent stall but it happens now and then , so can it be low fuel presure , just a thought

[Aladinsaneuk]

no andy, no roughness at low revs - I think the tickover is a bit low however

thanks joe, but I am convinced this is a fault with the fuel map - and mine is self inflicted as I have no back pressure on the pipe at all....

[D-Rider]

Cheers Pete and Joe.

Not to wish an additional problem on you, Pete, but I had rather hoped we were chasing the same symptoms ... looks as though there are some differences so things may or may not be the same.

Joe, I'm ruling nothing out but if fuel pressure is an issue, I think it's not the only issue as my problem is in such a narrow rev band.
Certainly fuelling is something that can be controlled very closely to the engine speed so that really has to be top of the list .... but experience of problem solving suggests it would be foolish to exclude all other possibilities.
Thanks for your thoughts.

TBH I've had no opportunity to investigate during the past few days - been off work all week but been sorting out my sons' bikes clearing up the garage and making insufficient progress on the list that the mrs has prepared ..... some summer holiday eh?!

Hopefully find a moment to look at it sometime soon .....

[Nooj]

Mr. Rider, have you checked the HT leads at the coil ends? Have you set the plug gaps correctly? Are the CO2 sensor plugs screwed into the down pipes properly? Are the down pipes fitted to the ports properly?

It does sound like a mapping thing though. When you say it's running rough, does the exhaust note sound kind of fluffy or wooly* and and the bike is slow to pick up the pace or does it feel like it's trying to keep lurching forward on a steady throttle?

Pete, your is just down to your mentalist exhaust fetish.




*Odd description, but you'll recognise the noise.

[D-Rider]

Replies in Blue

Mr. Rider, have you checked the HT leads at the coil ends?
No - but I will

Have you set the plug gaps correctly?
Yes - and they're the Iridium jobbies so should not need to be adjusted frequently - if at all

Are the CO2 sensor plugs screwed into the down pipes properly?
Yes - and sealed in with high-temp silicone as this was one of my earliest suspects

Are the down pipes fitted to the ports properly?
Yes - with new gaskets - fitted them 3 times as this was my first area of concern - but I'm sure they are fine.

It does sound like a mapping thing though. When you say it's running rough, does the exhaust note sound kind of fluffy or wooly* and and the bike is slow to pick up the pace or does it feel like it's trying to keep lurching forward on a steady throttle?
Feels like it's misfiring

Pete, your is just down to your mentalist exhaust fetish.
.... but we've both gone 2into1 .... It seems to be a common factor



*Odd description, but you'll recognise the noise.

[Nooj]

Could well be the cause then.

Are you both running different chips? Stick the originals back in and see what it does. If you both have PCIII's try exchanging maps and see what happens, see if you end up with each other's symptoms.

[Falco9]

Replies in Blue

Mr. Rider, have you checked the HT leads at the coil ends?
No - but I will

Have you set the plug gaps correctly?
Yes - and they're the Iridium jobbies so should not need to be adjusted frequently - if at all

Are the CO2 sensor plugs screwed into the down pipes properly?
Yes - and sealed in with high-temp silicone as this was one of my earliest suspects

Are the down pipes fitted to the ports properly?
Yes - with new gaskets - fitted them 3 times as this was my first area of concern - but I'm sure they are fine.

It does sound like a mapping thing though. When you say it's running rough, does the exhaust note sound kind of fluffy or wooly* and and the bike is slow to pick up the pace or does it feel like it's trying to keep lurching forward on a steady throttle?
Feels like it's misfiring

Pete, your is just down to your mentalist exhaust fetish.
.... but we've both gone 2into1 .... It seems to be a common factor

*Odd description, but you'll recognise the noise.

Been following this thread with interest. When I went this route ( 2 into 1) I continued to run the bike on the Carbon SL chip and it was perfect. I don't think the exhaust configuration is your problem unless you have leaks in the system (possible but highly unlikey). Just for info you cannot adjust Iridium tipped plugs so please don't try as you'll break them.

I think you can experiment with various maps for ages but at the end of day you'll always have someone elses map which was for their engine. Wouldn't it be worth spending some time on a local dyno and get them to map your PC111 to your bike???

F9

[D-Rider]

Hi Rich.

Yes I do plan to get a custom map made for my PCIII - and I had planned to get it done this week while I've been off work.
I've held back as I don't want to waste my cash if the problem is not fuelling alone.

If it is fuelling, I think I ought to be able to find a map that, although not perfect, at least smooths things out a bit and stops it backfiring.
Once I've got to that stage and effectively eliminated "other factors" I'll get a new map done.
Pete rang me tonight and suggested I try a map for a stock (derestricted) Tuono.
I've just downloaded that into my PCIII and I'll give it a go a bit later.

Yes, you're right about the Iridiums (I've never actually fiddled with them as I knew they came "right" from the factory .... just didn't want to complicate the thread). Besides, I've got to trust them as they are one of our company's products. {..... and No - you vultures, I can't lay my hands on sets of these at knockdown prices .... getting hold of a set for myself was not exactly easy ....}

Cheers,
Andy

[Aladinsaneuk]

I will also be getting a map done, but not just yet

some of you know that "aladinsane skunkworks" has been busy working on something, and until that is finished, I will not be making that jump.... if what I have planned does not come off, then I will think again and then do the custom map

(I will be using shawn taylor racing in norwich btw)

I think that fueling is the key - both for myself and for andy - but we will see

finally, just doing something normal is just so boring!

[D-Rider]

We're Half-Way There

Loaded the base Tuono map tonight, went for a run and it's fixed the rough running. Thanks for the suggestion Pete.


Backfiring still there though



I notice this map really increases the fuel delivery at small throttle openings in the rev range that had been the problem.

Ah well, one problem down, one to go.
Can't help thinking that the next one might not be so easy .... surely the addition of fuel that seems to fixed the rough-running is not going to help the back-firing?

[Falco9]

With all this talk of skunkworks and shortened cans I thought I might show you my latest bit of fettling.
I also fancied some shorter cans so..............I took a std set of RCVR / Tuono exhausts, took 125mm off the end, cored them removed the CATs and wrapped the acoustic matting tightly around the replacement perforated steel tube core before filling the rest of the void. Mirror polished all the stainless steel and heel plates (I luv my bling!) put it all back together again and voila!. I managed to convert both cans from standard to these in a day. The Leo stickers are just a couple I had lying around so I thought I'd see how they looked

Can photobucket or some other site hold a sound bite file, if someone can tell me how to do it I'll post one up because the noise @ 5k revs is superb (it really does set off my car alarm!) totally addictive (lol)







F9

[Aladinsaneuk]

Very nice!
And am glad someone recognised skinkworks as well
Funnily enough my cut down tuono exhaust took about a day as well