Help/Input Needed - 2002 Speed Triple 955i Stumle/Hesitation Below 3k RPM...

[PhilM]

I think you'll find that for a 12:1 compression engine 160psi is low.
Have you swapped the ECM's?

[inderocker]

Originally Posted by PhilM

I think you'll find that for a 12:1 compression engine 160psi is low.
Have you swapped the ECM's?

Not at 5,368'... guess I should of mentioned that earlier. ECM swap is next.

[DEcosse]

New data!

The baratron is built into the ECM and should accommodate the pressure change - I've had my Daytona up to 10,000 ft and still runs well

There should be a hose from the ECM baratron to the airbox - make sure that hose is not kinked or folded. Doesn't make whole lot of difference if cracked as is really just sensing atmospheric pressure and airbox pressure not significantly different.

So you are obviously 'lean' at the bottom end - which means not enough gas for the volume of air. K&N would actually make situation slightly worse.

Try loading one of the TORS tunes with TuneECU, which will enrich things a bit for you.

[inderocker]

Fixed! It was the ECM. Out of the hundreds of bikes I've owned, both personal and for resale, I've never seen a faulty ECM. On that note the majority of those do not have tunable ECM's... I suppose someone could of half fried this at some point when tuning it.

[DEcosse]

I would doubt it was the ECM itself - probably has different map in it

[inderocker]

I uploaded the same map, 10157.

[12340987]

Originally Posted by PhilM

I think you'll find that for a 12:1 compression engine 160psi is low.

Isn't that a concern? A difference greater than 20% is usually a bad sign. But in this case it's probably just a valve adjustment.

[PhilM]

It is a concern. Does not state whether the throttle butterflies were open when running the compression test as that can be a factor, especially if they are not balanced.

[inderocker]

WOT when testing. 160 was the far left cylinder, which I could not get the tester well seated in.