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As most of you know, i rebuilt my 3MA and finished it in January. 105 mod, removed snorkles and zeeltronic 20v CDI.
Well i ran it in, experimented with the fixed AJ, went from 1.3 down to 0.9 and chucked the solinoid unit in the box, used a EGT to monitor temps and notices the biggest problem was running up to 1/3 throttle at say 130km/h and 6000-8000 RPM. the temp would just climb to the point of self destruction.
now i hear the cries, lift your needle and we all know what that does... yes floods the cranks at low throttle and RPM so i went into the zeel and flattened the curve in the 0-33% TPS so it never goes above 18 deg. well, i must say i think that is the cure, i did a 145km ride and never had that problem again.
Then, quite happy i took her to the dyno (i have a pretty lame curve in there, nothing over 25deg) and i clocked 62.9HP!!



http://www.youtube.com/watch?v=9bLeA21sZ28

quite happy i took her to the dyno (i have a pretty lame curve in there, nothing over 25deg) and i clocked 62.9HP!!

That is a verry good resuld Ndwedwe 62,9 is like

How much degree did you use at peak power?

here is a screenprint of the graph, i think it is worth noting to avoid meltdown, the trick is in the 0-33%, see how lame my 66-100 is. proof these bikes just want to go!!!!
yes it is not mathematically perfect but it is where i got the best results, any constructive critisism is most welcome

I cant get over how good your bike looks especially with that paint design and colours, and I mean that. Awesome, great job.

any constructive critisism is most welcome

Well that's a bid difficult as you already have hit the 62+ HP and i have just hit the 60HP
(But I know what my problem was, woring on it )

If you are using a stock 3ma head (will be around 10.5 a 11cc) I had good rusults with 14 degrees at peak power (15 degrees was to much)
As your engine peaks at 10.500rpm you could try 13 or 14 degrees there.

Its a small thing, but perhaps it will gain you a small pony

Cheers

will give it a go louis, cheers

Hey Paul , i am amaized at the quality of your bike camera , i think my oregan camera is a overpriced gimmick .

Nice pic of the bike! Just posted it to the random pic widget on mytzr.com.

Luke 3MA wrote:I cant get over how good your bike looks especially with that paint design and colours, and I mean that. Awesome, great job.

cheers mate, i could have gone to std again but hell, it's my bike not everyone elses, so i used a few pics, a bit of std in there to.

I think that's just why I think it looks so good, a bit of variation and an extra colour. I think I will have to save that paint design for a special 3ma that I will never leave. for the present bike I cannot decide standard orange and white or black and grey?

Hi lads
I bought a set of sugo pipes off gumtee. I had them sandblasted and I painted them up. Fitted them yesterday.





http://i172.photobucket.com/albums/w26/ ... 71ef01.mp4

Bolted straight on. Silencers aren't the best and I will and up making new ones.
Bike feels great but I am brought back on revs now. STD carbs and porting. It kind of drops off at 10500 now. I have sugo carbs I can try but as it's running well on STD carbs I am wondering.
What changes should I expect to be making with a pipe change like this?
I have pushed my zeel curve out a little and can try that. Do you fellas think it could be an advance thing or what?

Hi Paul,

I have the same set here, with about the same results as you have.

For what I can tell you (I'm not a profesinal) its all about the length.
Your sugo pipe are roughly measured 870 a 880mm in length, the 3ma1 pipes are (as you may guess) roughly 880mm
You have shorten the 3ma1 pipe with about 27,5mm (15 an 12,5) so the total lenth will be close to 850 a 860

Also the fitmend of a original 3ma pipe is shorter then a sugo/race pipe because the race pipe uses a flange (the length of the flange will be counted with the pipe length) and a race/sugo or whatever flange you use is longer than the stock bold on off a original pipe.

In short terms
I guess your modified 3ma1 pipe is shorter than the sugo pipe (measured the total length, start piston till the last cone)

Short pipes like to ref more.

But I can have it wrong ofcourse, so this are just my thoughts
Cheers

Well louis. Nice to know you shared a problem there.
I wonder what the deal is as they were bolt on pieces sold by sugo.
I have the feeling the bike suffers from air and maybe a bit of advance.
Louis I see your one bike has no airbox (I hope it was you and I ain't got it wrong) what are you doing there?
How do you run your carbs where there is no space for pod filters? I was thinking about fitting the bottom of my airbox and putting 2 pods on the uprights.
I have another challenge I see. I was hoping there would be a response from guys who have fitted them and got good results. Early days, I am sure I'll get it right.
I must say bike is very crisp and enjoyable.
Have you considered shortening yours, now you have new welding skills?

I wonder what the deal is as they were bolt on pieces sold by sugo.

Think it was a good replacement for a road bike because they spread the power wide (no real peek, like a race bike)
You see them quit a lot I'm not sure if they are sugo's.
(here you have a (new) set)
http://www.ebay.com/itm/TZR250-SP-JACKAL-RACING-EXHAUST-MUFFLER-EXPANSION-CAHMBAR-3MA-/180898822499?pt=Motorcycles_Parts_Accessories&hash=item2a1e68f963&vxp=mtr

I have the feeling the bike suffers from air and maybe a bit of advance.

That could be, difficult to say from the movie

Louis I see your one bike has no airbox (I hope it was you and I ain't got it wrong) what are you doing there

I'm building a (semi 90's) race bike they have no airbox but don't worry. ones the tzr125 race fairing is fitted the belly of the fairing will be the airbox.
There will be (carb) foam and it will be bended from radiator to the back of the carbs then going down to the belly of the fairing.
In theory the foam will be like a big airfilter but I'm not that far, I have the foam all ready.

I was hoping there would be a response from guys who have fitted them and got good results

I had 59hp with them, but with one wrong pv's in the cylinder, so think you will hit the 60's with them on a good engine
But i don't think they are dream pipes. You can measure them correctly and give the dimensions to Eeknows think he can calculate where they peek is and where they are designd for.

Have you considered shortening yours, now you have new welding skills?

I have so Manny plans you can make a book from it (a large book), I really have to focus on one bike a time.
Otherwise I will end up with no running bikes, but only bikes where I'm building at.
Dont forget, Got six of them

maybe they are jackal's, thanks for that
i really like the power delivery, it pulls through that 4000-6000 3ma-sh1t-spot a lot better.
if i tap off and roll on again i get a hesitation which i think is airbox restriction. making me think it needs more air, will go up on mains first. what size were you running with these louis?
6 No. qty 3ma's!!!!!!!! bliksem OCD.... man, i can't get over that one!!!!

I'm running them with 300 mains and ignitech controled ignition (airjets only open in the low revs)

6 No. qty 3ma's!!!!!!!! bliksem OCD.... man, i can't get over that one!!!!

Well it was not planned, but the collection just kept growing

When the 3ma hybrid bike is ready, it will pouched of here work space and a new project will be pouched on it.

Can you post a curve you are using. What pilots and airscrew setting. Is it 3ma1?

I can post more then a curve
Here you go
http://tzr250.webs.com/testingspexhausts3ma.htm

Setup bike:
3MA3 bottom
3MA1 cylinders
32mm carbs
mains 280 (was to small, so have 300's in them now)
pilots stock
air jet screw stock (2,5 turns out)
Airjets open in the low revs

It had +/-60hp (but with wrong pv in one cylinder )
Small note:
At that time I dident knew than that the base advange of a 3ma3 engine is 21 degrees, so the whole curve you see is axially two degrees more.

Curve is not spectacilar at all, this is one of my first plays with the ignitech.
You can see the differends to the engine with one degree differend at 10,750rpm

hi love the look of your 3ma are these panels originals as they look awsome or did you have yours painted

Thanks louis. Will digest it today. When things start happening fast, like after 9000, it is as you know, a combination of things to get it right. From the little I have seen of the sugo curves, they hold out longer. I will test and post as always.
Roystzr, it's is a paint job. The lad I use here in Pinetown, custom designs, is really super. I have given him my tatty Honda. Will give before and after.