4t tuning thread

[richban]

so biggers not always better........?

Tiz a 30mm so bigger is better on this engine. The 28 worked really well on the old standard model. Perfect fueling on the dyno. But when the new beast was born it was a real bitch to tune.

[richban]

Is this the carb your using, the OKO brand from Taiwan.........

Same same but different. Akunra 30mm rip off. OKO do a 28 but not the 30. Anyway the thing I realized was you think you have it sorted and working until you try something else. Lesson never stop messing with your bike.

[Bert]

they are a great type of carb (my 28 is very easy to setup). I'm still waiting for the 30 to arrive for the new build..

I wander if this could be a solution for mudflaps?

[richban]

I wander if this could be a solution for mudflaps?

I was going to try palm off one of my TM28's. I reckon I could jet it for a lunchon really nice. It worked great on the standard engine.

[Bert]

Good Plan.
I'll send him down a single throttle unit then he should be all go

[richban]

Couple of pics of the new pipe. Big hole make big noise. The little shroud does wonders. I reckon it will look very cool when all painted up.

[TZ350]

Very interesting, looks a bit like the small reverse cone seen on megaphones of old Racing singles........ I wounder what do the classic boys do with their megas now, to quieten them down?

Very clever rich, I am impressed by your work.......

[koba]

I wounder what do the classic boys do with their megas now, to quieten them down?

Classic meetings still make your ears bleed if you stand next to the pit wall.

[richban]

Classic meetings still make your ears bleed if you stand next to the pit wall.

Some people put a small baffle in the revers cone. The smaller one I made could almost run open it really was quite quiet but did not make any more power. I am going to make a couple more shrouds with different amounts of perforation to see what noise reductions can be had. They are quick to make.

[Bert]

your bike looks the part Rich, and cheers for the brew.

though about this a bit more last night, not the most exciting evening in welly...

what about a supertrap like baffle system?
I know we had a lot of success with a similar design to quieten down a speedway chair, years ago...

a few disks and you could be away laughing???

http://www.supertrapp.com/technology/index.asp

as discussed,
silencer application: (ok designed for twostrokes but must have some uses) second to last download on this page:
http://www.mh-aerotools.de/airfoils/software.htm
audio spectrum software:
http://www.trueaudio.com/rta_abt1.htm (free) and a $5 microphone for Jcar. could also work as a knock sensor for tuning your CDI??
If you know what your main driving frequency is, then you could gain a lot more with your slit concept..
I think I've posted this up before somewhere......?

[richban]

your bike looks the part Rich, and cheers for the brew.

though about this a bit more last night, not the most exciting evening in welly...

what about a supertrap like baffle system?
I know we had a lot of success with a similar design to quieten down a speedway chair, years ago...

a few disks and you could be away laughing???

http://www.supertrapp.com/technology/index.asp

as discussed,
silencer application: (ok designed for twostrokes but must have some uses) second to last download on this page:
http://www.mh-aerotools.de/airfoils/software.htm
audio spectrum software:
http://www.trueaudio.com/rta_abt1.htm (free) and a $5 microphone for Jcar. could also work as a knock sensor for tuning your CDI??
If you know what your main driving frequency is, then you could gain a lot more with your slit concept..
I think I've posted this up before somewhere......?

Cheers Bro

For some reason I hate supertraps it might just be the way they look but that is enough for me. I think cutting a couple more slits in the end shroud might do it. I've been told with megas you really don't want to reduce the end diameter unless the dyno tells you to. I will bodge up some reducers for testing.

Not even sure I will have enough time to setup the ignition. New engine is going to take a while.

[Bert]

Carbs for a 150 four strokes?
just looking at putting an order in and bring out a a few extras. so what size would suit the standard lonchins?? 28-30-32?

[fi5hy]

any more than 28 and your cheating

[richban]

Carbs for a 150 four strokes?
just looking at putting an order in and bring out a a few extras. so what size would suit the standard lonchins?? 28-30-32?

I recon the 28 for a 2 valve 150 and the 30 for a 4 valve engine. Running a 30 on my FXR and it is mint totally out performs my old 28 mikuni. They are a little brittle but work very well.

[richban]

New Wheels
Well new wheel. Front RS goes straight on just need to take a bit of the rotor and make one spacer. Rear is not such a big issue but a little more dicking around should have that sorted in the next week or so. The new engine is almost ready so time to re think exhaust and intake. What ever happens a new light muffler is in order. Going to try a slightly bigger header. And a new mega. Also looking at a brace for the front and a swing arm improvement. Quite keen to stay with the FXR and not go to another frame. Even though I have a very good option in the shed now. Got rid of the RGV and replaced it with the RS. The weight savings and power should be a big improvement and will hopefully help fend of the 2 strokes that are being developed all over the country. Now all we need are some races to compete in.



pics