forums.mytzr.com

Right, seen as the tzr250.com forum is down I will continue on here for the mean time or forever , as you can see in the vid the bike is missing a few parts, By next week I should have had the parts bead blasted and sprayed and run in done. Then it is onto the real fun part, tuning.

My set up at the moment:

standard 3ma1 carbs (32mm)
320 mains
standard needle jets
standard needles set to highest position(richest in mid range)
performance exhausts(thinner ones, will try other ones after run in)
snorkels cut
130 fixed air jet (mod)
everything else standard.

vid of the first start below

http://www.youtube.com/watch?v=_7H6DgETVXA

My set up at the moment:

standard 3ma1 carbs (32mm)
320 mains
standard needle jets
standard needles set to highest position(richest in mid range)
performance exhausts(thinner ones, will try other ones after run in)
snorkels cut
130 fixed air jet (mod)
everything else standard.

Thats looks like a good start Luke.
Be aware of the carb settings, make some runs and look at the plugs
You probably have seen how quick these bikes eat pistons

I think I will go a bit overboard with plug checks seen as though I really don't want another re-build. No harm in doing that though just to be safe

Hi Luke;

I am also at this point with a 3ma1. The needle causes the bike to run rich at 5000 to 6000 rpm. The vaj system opens more airjets at this rev range where the fixed jet only allows so much air. You probably already know this(I appologise). I dont know how to get past this problem without changing of the needles. Louis suggested I fit 3ma3 needles this will assisst with the problem. Ndwedwe has a programmable ignition which helped him overcome this problem. I dont want to change needles I believe warwick had a set up that worked with 320 mains but I can not remember the air jet size.

I am currently running 160 air with 250 mains,I started with 100 air jet, standard jets are 180 with 130 air at most of the rev range and throttle positions. Please keep in touch with your progress as I spend about an hour a week on this bike with setup to many other projects. So will appreciate some input.

Thank You

Edd

No problem Edd, I will post everything I do as soon as the bike is up and riding

I am hoping I can get past the problem without having to buy a new VAJ system.

By the way where do your fixed air jet pipes go to, mine are just cut short at the moment which is a bit dodgy because of the water getting in.

Luke

Hi Luke;

I am tapped the vaj intake pipe on the carbs so I just screw the airjet into the pipes. Once I am close to perfect I will fit it on the front of the carbs.

Edd

Howzit edd
Is that tape or tap? The pipe onto the carbs?
It has to go through the pipe on the left of the bellmouth looking through the bellmouth. The fluffs the fuel in the immulsion tube. It is the same pipe that ran to the solenoids. I am sure you got this anyway. Just checking.
I have has much success with the fixed AJ. I rate it. Even though I can control the solenoids with the zeel, it is more clutter and hassle.

I am a bit confused, where do your fixed airjet pipes lead to? I am thinking of cutting a hole in the top of the air box and shoving them into that.

Hi Luke;

Sorry for the confusion, ndwedwe has got it right. Not the first time I have confused people . I sometimes struggle to explain what I did in words. So lets give it a go. On the carbs their are copper pipes onto which your vaj system rubber pipes are fitted. These copper pipes are on the left or 9 o'clock position on the intake side of the carbs just below the "bell mouth" (my own spelling). What I did was, I tap 4mm thread into the copper pipes to fit the airjets which I got from the vaj box. 3ma1 (01 cdi) has size 50, 130 and 160 air jets fitted. I used the 130 and 160 with 250 mains, too rich at 6000 rpm. I will go to 200 mains seeing that standard is 180 do some test runs.

Edd

aren't you worried about dust/water/dirt getting sucked through them seen as though they don't have any sort of filter.

these are mine at the moment.



what I meant is where do they lead to from the carbs

For setting up I've always run mine just like that Edd. Once you have a size that works well fitting a suitable jet in the alternative bellmouth air intake (you need to remove the blanking ball and tap for a jet) works well, but you could also just run the hoses somewhere safe - fit them onto the air box or something?

Hi Warwick, I think you meant Luke. but never the less good info all sorted now thanks.

Hi Guys;

I had it setup like that with the plastic hoses had a set of air jets from keihin carbs, drilled them out from 100 to 160 doing test runs at ever 0,1 intervals with 250 mains 140 was the best I got with 250 mains. There is just no markable diffrences if there was a change it was very small. So stopped there and decided to fit 130 in the intake tube and then chage main jets and play with needle clip positions (still need to do this). The conversion warwick is refering to will be my final mod once I have sorted the issue at 6000 rpm. I think I will end up on 200 mains with 130 air fixed did some ratio calcs between the diffrent models and the maths indicates that as a starting point.

We will get there I just have the small issue of no airbox as my bike is naked, I only fitted the bottom half .

Edd

We sure will get there Edd.

bead blasting will be done by Thursaday, so hopefully I will get the bike up and riding and get testing by the weekend.

Just putting it out there. On 260 mains and 1.2mm AJ up to 750m AMSL I found run away heat issues on the EGT as mentioned before.
Beware. It will eat your pistons. No sound difference and not detectable any other way.

Hello Luke,

Have some pictures about Edd and Warwick modification's

Edd mod.
M4 tapped inside the tube:

Go's prety nice

With airjet mounted



Warwick mod.
The airjet lokation

Dril a small hole inside the boll

Turn a srew in

Pull it with a side cutter

And whola

Tape M4 in it

Airjet mounted


Persenally i have the same as Warwick but have the pilot jet also with a jet instad off a screw


Hope the pictures will give you ideas

Cool thanks Louis, so did you just block off the original intake for the air jet after you had drilled and removed the ball with the cutters?

My querie with Edds mod, is doesn't water, dust, dirt get in because it is just in the middle of nowhere. whereas yours and Warwick's mod is much safer.

thanks for the great pics and explanation, I appreciate it.

Hi Guys;

To get the right setup I decided to go with mod one on the intake pipes, then when all is well I wanted to do mod two as permanent. But I didnt know Louis had two jets in there. Might as well just do mod two from the start.

Louis what are the jet sizes you used? I saw ndwedwe's comment and I had a incident where I lost a piston once no warning. Can you please supply some guidelines for me as I have a standard ignition system and standard exhausts only restrictions removed.

Thank You

Edd

just to check, you will then block the original airjet, after you have drilled that ball out, because the air is now flowing through the airjet placed in the bellmouth.

I agree with you Edd why not do that from the beginning unless you are considering re connecting the VAJ system!

louis
please explain what the second jet does, you mention pilot, i am lost.
cheers boet