Yes theres no need to go to bigger exhaust valves

Steve...will you have enough room for the liner and a 105.5mm piston?

it will be close to the water jacket.....

Rev Limiter

Dynojet haven't got anything that will up the rev limit.

The only thing they suggested is to get a Stand Alone ECU......but they are �600......

So, I am trying other alternatives. I have looked at Ecu Flashing, but no-one has the stuff for the Denso Ecu. Although maybe in New Year there will be the technology.

And I don't have much faith in the Magnum -type rev limiters.

So, does anyone know how to up the rev limit on a XT660, WITHOUT running a special ECU?

only thing I can think of is to wire up a raptor ECU.

I'm sure that so long as you can get a pinout diagram of the XT and Raptor's ECU connectors and where what electrical connection from 'soandso device goes there' and so long as the vital information is still available to the Raptor ECU, I don't see a reason why it shouldn't?

Just because they may be different connectors, fundamentally, they wont be much different internally.

They both still need a feed from all the same sensors and everything.

Why would you fit a Raptor 700 ECU yes it will offer a wider RPM range, I already did all the + & - of fitting one & have mentioned it a few times. The Raptor ECU + Raptor wiring loom as it has a different ECU connector to the XT ECU + an ignition module is needed for this mod, you add up the $ & see what the mod will cost in the end.

If you are going to use the Raptor 700 ECU then you need to buy an ignition advancer system as well, as the 700 ECU has the ignition timing retarded big time in the upper rev range, have a look at any standard Raptor dyno runs.

It would be cheaper & quicker to fit a Rapid Bike ECU or a Power Commander ignition module to the XT.

Dynojet said that none of their products would change the rev limiter on my XT. They also say the Raptor 700 PCV does not work on a XT660Z/X/R & we all know it works perfectly. They aslo say the Auto tune does not work on a XT660 & we know it does.

That includes the Dynatek ignition module, I have news for them. (now thats what they say, but DO any of their products work "unofficially"??) Kev, did you say the Dynatek was being used on a XT? Yes by a guy in Greece, there is also a guy running a Rapid bike ECU with the a rewritten ignition map & has moved the RPM limiter. For an extra 500 REVS? I can't find the thread....an extra 500 revs would be ideal. Do some home work & have a look at how the Dynotek or dynojet ignition modules connect on a Raptor 700.

Does anyone know if our XT's a 16 bit or 32 bit ECU? Not sure

PIASINI ENGINEERING in Italy have just started to do bikes, and they make ECU Flashing equipment. They are apparantly trying to have all the Big Four bikes covered in the New Year........but I have e-mailed them with the details of ALL the XT ecu's, along with a nice email anyway...as I suspect they will only do the Sportsbikes.....so fingers crossed my email will get them going.... Sounds interesting, I deal with flashing ECU's everyday of my life, I do around 5 a day, engines, gearboxes, ABS, A/C ETC.

And Steve Athens has no dashboard now.........so a race ecu sounds a pain.......


And going back to Big Bores...and Steve Athens new project..how would you bore out a XT cylinder to 105.5mm, and Nikasil plate it? An Iron bore can't be Nikasil'd. ?? For a 105.5mm bore, it would have no skirt left! So, unless a Alu bore is put in, I can't see how it would be done on a XT barrel....huh?? I have asked the engine builder to look into it, but I am more inclined to stay at a 102mm bore, as I think it would be sweeter. (plus Kev will start groaning if I change my mind yet again...) You resleeve the XT660 cylinder to 105.5mm & run the cast iron cylinder, bore the XT660 casings by 1.2mm, I did my casings as I wanted to go to 105.5mm on my last XT.

As an afterthought.......I went out on my bike twice over the weekend....it runs so well and nicely, it makes me wonder why I am doing this project AT ALL!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Because you can, all the home work has already been done for you, so your conversion is a sure thing.

Kev...this may be a "long shot" but.....

You have a Speedo Healer, right?

Say you were to "correct" your speedo (which reads off the engine revs, right?) to read a MUCH MUCH lower speed than you are really doing, it MAY fool the ECU rev limiter......................and that should work in all the gears.....ok , your speedo will be out, but this is just an exercise.

You would have to set your Speed Healer as low as you can.....

It may work, may not, but surely worth a try?

If you have a rev counter, i think you do, then would that be worth a try?..it would certainly tell us a little more about how the rev limiter works/ runs from..???

Are we sure the rev limiter is in the ECU, and not the CDI as well??

[quote=richardsracingmad;139338]Kev...this may be a "long shot" but.....

You have a Speedo Healer, right? Yes I do V4.0

Say you were to "correct" your speedo (which reads off the engine revs, right?) No it reads off the gearbox out put shaft, has nothing to do with revs.to read a MUCH MUCH lower speed than you are really doing, it MAY fool the ECU rev limiter......................and that should work in all the gears.....ok , your speedo will be out, but this is just an exercise. A engine speed sender & a speedo hall effect sender show completely different wave patterns, can't see how it would work, something to think about though.

You would have to set your Speed Healer as low as you can.....

It may work, may not, but surely worth a try? Something to look at, I already have an easier way of advancing the ignition timimg over all & that is using an off set 4 degree woodruff key, easily made by Kev2.

If you have a rev counter, i think you do, then would that be worth a try?..it would certainly tell us a little more about how the rev limiter works/ runs from..???

Are we sure the rev limiter is in the ECU, and not the CDI as well The CDI is built in the ECU if you want to call it that. CDI is a very old term for Condencor Discharged Ignition, the XT660 from 2004 has a Transistorized coil ignition (Digital) & is made by Denso.

I belong to this forum if you want to learn how to hack a ECU.

http://www.activeboard.com/forum.spark?aBID=99460

I belong to that forum as well...

I am conversing with PIASINI, in regards to getting the XT660 ecu flashed.
This will open up the O2 sensor, rev limiter, ignition advance etc. alterations, so that we can make our bikes run better. It will mean that we can adjust the FUEL /IGNITION when going over 7200rpm in particular, as well as ignition advance etc......

I am sending my ECU to them, Kev is helping as well, and this should be a great move forward, in modding XT's. It will not be a quick result tho.......but I think we will get a good result at the end.....

IF ANYONE HAS ANY LOGGING/DATA WITH REGARDS TO IGNITION FUEL etc.../RAPIDBIKE/DYNATEK/CUSTOM ECU etc... THAT WOULD HELP THE DEVELOPMENT, PLEASE CONTACT ME.

I have sent a XT660 Crankshaft to High Desert Dyno in the States, so they can see it, with the view to making a "drop in" stroker crank for XT660.

Pistons.....Originally I was going for a 103mm, been put off that one.
Then a 102mm, a good choice..and cheaper...but..I like the sound of Steve Athens's 105.5 bore project..so....
Steve Ruth is going to do me a 105.5mm, in a XT cylinder, (not a Raptor cylinder).

The Good News.......
 

My Cylinder Head, Crankshaft and Throttle Body have arrived in the States, at High Desert Dyno for Dan to do his magic....:020:


Unfortunately, the Cylinder Head has been damaged in transit,... but luckily I took out Insurance...but still a bit of a blow.
Dan says he can repair it tho'...:headbang:


PIASINI ENGINEERING. (Italy) ..more of the good news.....

I have got CHRISTIAN PIASINI (the ECU Guru) to join our forum. I have done alot of telephone calls/emails behind the scenes, searching for a solution for upgrading our (my!!) ECU'S, (a re-program/flash) , enabling things such as :
Upping the Rev-Limiter, Altering Ignition Timing, Fuelling, and possibly the O2 sensor as well....

What this would entail, once development is complete, is that you just send your Ecu to one of his UK (or Overseas) Agents, and they will "Flash" your ecu, and send it back to you.
This will not only be cheaper than fitting a Race Ecu, it will mean that your dashboard will still work as well, that you won't have to do a major re-wiring project, and no complicated and expensive Dyno re-program/set up.
So.. far less hassle,you would just have your ECU altered. That's all. Just Plug and Play.

Our Denso ECU on all years/models is a very awkward one to alter, that is why no-one has been able to change anything before.
Piasini Engineering are a very highly respected Company, in Race Car Ecu's, and they are branching into Motorcycles. They have already done some work on our Ecu, along with similar Denso Ecu's, but are still working on the Read/Write part of their program.

We are priviliged that they are taking such an interest in developing our XT's for us.........they obviously get most interest/business from the R1 type of bike, and race teams/drag bikes.

I really hope that this is met with alot more enthusiasm than Kev+Daz's 02 Sensor mod...(with only a pityful THREE customers interested, after TWO years of work and hundreds of people complaining of surging)...even though it is more of a "Specialised Tuning Mod".....