3ma problems

[deonillovo]

Hi Edd thanks for that but we seem to miss each other and some times it is quite difficult to receive calls at work as we are quite busy and no easy to hear the phone just sms me your details and i will contact you where about are you situated and what body panels have you.
I have a complete set of carbs they are 32mm mukunis all in working order only 1 air screw head not so good but it will help you many thanks for your help
Could you explain to me how and the correct way to set the float level and should the small piece that holds the needle and seat should this be level or raised or sunken a bit.

Many Thanks;Deon

[deonillovo]

Hi Warick please could you tell me how and which is the easiest way to adjust the float levels must the small cut out piece that holds the needle and seat be level/raised or downwards and the float levers how much do i adjust your input will be appreciated.

Cheers;Deon

[Warwick]

The process is illustrated in the manual, Deon - with some useful pics.

It's a little involved to get them absolutely accurate but ideally you should set the float heights by adjustment of the central tang of the thin brass float levers - where it touches the shut off valve. Make sure that the arms of the float lever thing are equal. You'll get the float height close enough by tipping the carbs upside down and measuring from the bottom of the upper carb body to the bottom of the float and adjusting them to around 19mm if and as necessary.

Measure the fuel height itself with the carbs on the bike by putting a piece of suitable clear tube on the carb overflow, holding it up vertically against the carb body and undoing the carb overflow screws. This will allow fuel to enter the tube and settle at the height the fuel is on the inside of the carb so you can view the fuel height. You are aiming to see a measurement of 5-7mm above the float bowl gasket face. If the fuel height rises when the bike has been stood for a while you'll know the fuel shut off needle valves or seats are not doing their job.

All that can sound a little complex if you haven't done that sort of thing before, but have a look at the pictures in the manual for illustration and give it a go. It's very straightforward really.   

[Edd]

Hi Deon;

Agree with Warwick, That in my view is the only way you can do it if your neeldle valve and o'ring is worn. Once they get old the float height changes your floats needs to push harder on the needle valve to get it to close off the fuel supply.

[Edd]

Hi Warwick;

Done most of the conversions you are refering to; to my track bike, i have cut my airbox on the two pillars left and right that way my radiator brackets stay put. The outside diameter of those pillars are is 63mm and I got hold of pvc pipe with a 63mm inside diameter black cant even see the modification. Like the battery idea especially for the track bike will do that if i need a new battery.

[deonillovo]

HI Edd i am still waiting for you to send me your contact details so that we could meet i have a complete set of 32mm carbs as you requested

many thanks Deon

[deonillovo]

Hi Warwick thanks for the technical info i will try this over the weekend and let you know how it goes one more thing i am getting a very bad fuel consumption from the bike is this due to the levels that are incorrect as well as a slight moisture mixture coming out of the exhaust this might be a silly question but i need to start somewhere

Thnks;Deon

[Warwick]

If the carburation isn't set up well (especially at smaller throttle openings) and if the carbs are overflowing too, then that's not going to help with fuel consumption in everyday use. That said the 3MA - like all 250 strokers - is hardly frugal on the juice. For reference I get about 150-160kms before reserve from a full tank.

[louis]

Hi Deon, I pm you my email address.

But i have the same advice as the rest, think your float needles are not closing right.

(I have the same problem with my tzr125 4dl it is annoying)

Cheers

[rz350]

I have noticed that my 3ma, is a bit slow from the start...looks like it is struggling a bit compare to the RZ350, untill 7-8000 revs, could it be because I installed 205 jets and cut the air intake boots? It also looses power at 11000, like cuts out... otherwise it is perfect, start and goes etc.
Really dont want to take it apart again as long as I know what to do- what do you think to rich or too lean?  You think I can do a difference by just adjusting the air screws? They are 2 turns out now needle position 2.

[louis]

Hi rz350,

205/210 mains with cut snorkels will be pretty good i think.
But than again, the carbs setup will be a never ending discussion

At 11000 rpm you have rich the max power from your standart exhausts, it will rev a bit more but you will not gain power.
Think the standart 3ma1 exhausts pipes has it's max power between 10.000 and 11.000rpm
The 3ma3 exhausts pipes power will be a bit lower a bout 9.500 till 10.500 rpm

the struggling at lower rpm is something that the 3ma's does.
You can try to switch the cables from the air jets solenoids, perhaps you connected them wrong 2 is 3 and 3 is 2
Switch them en feel if it is making any difference, it coed be the problem

Cheers

[rz350]

Really? I thought it doesnt matter how you connect them...
Thanks louis.

[louis]

The two solenoids have diverend air jets

MJ2 has 50
MJ3 has 160

So when connected wrong the carb will get more or less fuel by certen rpm

But don't expect miracles, under 6000 is not the strongest point off a 3ma

[rz350]

louis,
Tried it, didnt make much difference...still kind of dies at around 11,200 rpm. What if I install a bigger airs? Would it help at low and high end...no right?

[louis]

rz350,

what do you mean with dies at 11.200.
Can you rev it up till 12.000rpm, ore does it suddenly stops at 11.200rpm?


Normally with cut air box snorkels, and rings removed in the exhausts, mains are good around 210/220
Don't think you should change airjets because yours is quite standard.

Do you have removed the rings in the exhausts pipes?

Rings removed and removing or cut air box snorkels will gif your 3ma more power (those are the restrictions fore the standard 45ps)

If you have the rings in your exhaust pipes, perhaps this will affect your high rpm's (sadly cant tell you how a 3ma rides with rings in the exhaust, it was the first thing what i removed when i had my 3ma)

Perhaps you can put 200 mains in it a bit leaner will allow your bike to rev higher, but be carefull