Manshed day in Nowra

[oldktmdude]

Pete, Yes for Dyno early Jan, just let me know time and I'll see you there, How do the bigger jets seem?

Alan, only had a short ride since doing the jets but seems to pull harder at the top end. I could be just imagining an improvement as I haven't ridden it for a while. The dyno will show how it's changed.
   Regards, Pete.

[Troyskie]

This shed day just gets better.
We did a little part two to the dyno run.
Pete, Alan & I put our bikes up again to see who had the most improvement AND, who might beat Jools on the 'anti pursuit', 007 style smoke screen.
Pete wins again !
Al & I tied on the smoke screen, but Jools, you still hold title on the best Bond effect .
Anyhoo FJ fans below is the chart.....

BTW- for those wondering why my bike falls off a cliff at 10k RPM, we discovered it has a rev limiter! The other two don't.

[Bones]

Comparing early figures to the new ones show Pete gained 6.13 hp and 2.02 ft-lbs torque, while Troy gained 6.63 hp and 3.53 ft-lbs torque.

Just goes to show that there's horsepower to be found just doing simple things like Pete did and increase jet size, or doing what Troy did and fit a new exhaust system.

They might be a dinosaur engine, but they respond well to tweaks, and although you didn't get the expected 130hp Pete, 126hp is pretty damn good and nothing to sneeze at.

[ribbert]

.......we discovered it has a rev limiter! The other two don't.

This always gets my attention. The rev limiter seems to be a greater mystery than the function of the reserve switch (which is no mystery at all  )

Someone recently posted that Randy had cleared it at a rally a while back.....

Yes all FJ,s have a rev limiter ,however they do not always cut out at the same RPM. Some cut out at 9.5 while others will go to 12k.
This topic came up at the Renegade Rally this year and RPM randy cleared it up. Some of us have found the limit and others hàve not.

.........but didn't expand on what he said.



Manufacturers of vehicles equipped with limiters generally set them very near to redline, that being what they have determined is the safe limit to rev the engine to without damage and beyond where it stopped making more power anyway, not 30% higher. (I wouldn't think an FJ engine would be capable of revving past 12k without a limiter anyway)

If anyone can explain this to me I would be grateful.

Noel

[Troyskie]

One other little surprise is the tacho kept winding up to 12k even though the dyno picked up the cut-out at 10k. Simon, riding the dyno, noted the same.
I did have a fang on the way to the dyno and the tacho was telling me the engine was getting to 12k .
I don't know instruments, but my guess is it could be that the tacho is (after 30 odd years) out of calibration/worn out/sticky, and not really showing what the engine is doing. Plus I assume Yamaha might calibrate a safety margin in to keep the engine in one piece.

[oldktmdude]

Comparing early figures to the new ones show Pete gained 6.13 hp and 2.02 ft-lbs torque, while Troy gained 6.63 hp and 3.53 ft-lbs torque.

Just goes to show that there's horsepower to be found just doing simple things like Pete did and increase jet size, or doing what Troy did and fit a new exhaust system.

They might be a dinosaur engine, but they respond well to tweaks, and although you didn't get the expected 130hp Pete, 126hp is pretty damn good and nothing to sneeze at.

Just ordered some bigger main jets. It's still a bit lean so more fuel can't hurt. Sneaking up to 130 hp. 

[FJools]

Good work lads,

glad to see you keeping it in there, but Troy all being well you will need to find another smoke screen provider for the Rally in March..........and I'm still at a loss which Delkovic slip ons to source. They no longer list any for the 3XW, but how close a fit are the 3CV models ??

[Troyskie]

The slip-ons I've fitted are for the 3CV (FJ1200 3CV 89-90). I went with the 450mm length, I believe they have a 350mm version which I think would be better.

[ribbert]

   .....Just ordered some bigger main jets. It's still a bit lean so more fuel can't hurt. Sneaking up to 130 hp. 

Again!!??

Pete, I've got a roll of 3/8" copper water pipe if you need to go any bigger, I can send you a length.

Noel

[oldktmdude]

Again!!??
Pete, I've got a roll of 3/8" copper water pipe if you need to go any bigger, I can send you a length.

Noel

Noel, I'd take you up on your offer except that would be a backward step. My new jets will be larger that 3/8".    
   Roll on March. Regards, Pete.

[ribbert]

Yes all FJ,s have a rev limiter ,however they do not always cut out at the same RPM. Some cut out at 9.5 while others will go to 12k.
This topic came up at the Renegade Rally this year and RPM randy cleared it up. Some of us have found the limit and others hàve not.

If anyone can explain this to me I would be grateful.

Noel

Can anyone explain how this works?

Noel

OK, third and final call before I give up. I don't ask this just for myself, I am sure there are many here who would like to know just how it works and why it differs from bike to bike.

It would nice to have it cleared up and put to bed once and for all. 

If no one answers I will enquire from someone that knows or be forced to stick with my own delusional ideas on how this works.

Noel

[The General]

Yes all FJ,s have a rev limiter ,however they do not always cut out at the same RPM. Some cut out at 9.5 while others will go to 12k.
This topic came up at the Renegade Rally this year and RPM randy cleared it up. Some of us have found the limit and others hàve not.

If anyone can explain this to me I would be grateful.

Noel

Can anyone explain how this works?

Noel

OK, third and final call before I give up. I don't ask this just for myself, I am sure there are many here who would like to know just how it works and why it differs from bike to bike.

It would nice to have it cleared up and put to bed once and for all.  

If no one answers I will enquire from someone that knows or be forced to stick with my own delusional ideas on how this works.

Noel

[FJscott]

IF, the 92 FJ has a rev limiter.....mine does not work.
Scott

[rktmanfj]

IF, the 92 FJ has a rev limiter.....mine does not work.
Scott

If my '89 has one, it's above 10,500 rpm...

[Bones]

Yes all FJ,s have a rev limiter ,however they do not always cut out at the same RPM. Some cut out at 9.5 while others will go to 12k.
This topic came up at the Renegade Rally this year and RPM randy cleared it up. Some of us have found the limit and others hàve not.

A 9.5 thou rev limiter on a bike with the red line at 9.5 thou makes sense, but having the rev limiter set at 12 thou on a bike with a red line at 9.5 thou to me goes against the manufactures recommendations.

Why would they put the rev ceiling 2.5 thou higher than the red line, at those revs you've gone past the peak power and torque outputs and it'd be like flogging a dead horse.

I've had mine to a bit over 10 thou and its fairly howling, and even though it might be possible to go higher, mechanical sympathy stops me from doing it. If they do have a limiter, I haven't reached it and never will.

Sorry Troy for the thread hijack.