forums.mytzr.com

first of all hi guys, well the problem is ive had my bike stored for 2 years now and just the other day put some fresh fuel in it and got it running, it ran ok but nowhere as good as it should (mainly fouled plugs i think), the next day i went to take it for a warrant of fitness and it wouldnt start first kick like normal, i eventually got it running and then it just kept on dying as it returned to idle, long story short i found about 2 liters of fuel in the bottom of the air intake pipe, not sure of the problem, im a truck mechanic and have never had 2stroke petrol experience, [b]PLEASE HELP[b] Peter from NZ

Hi Smokin3ma

If she doesnt idle your pilot jets are blocked. I will remove the carb give it a good clean and reset the float levels. In the manaul you will see some pics on how to set your carb float levels.

Edd

Hey Edd, thanx for the quick reply, that sounds like a great start, the only problem is i dont have a manual to look at to set float levels etc, any idea where i can look at one or get hold of one??
Thanx for all the help

Peter

Hi,
3MA files are here but most in Japanese because bike was mainly for domestic market.
http://www.pure-2-stroke-spirit.info/filebrowser/3MA

sounds like the floats are stuck the reason it wont idle is due to the fuel sitting in the air intake it will be running really rich strip the carbs down and clean the needle valves dont adjust the heights as they were fine before it was stood. the needle valves prob have some dirt/gum on them where the fuel has gone off and are stuck open thus letting fuel into the air intake clean all the jets while you are there just to make sure

good luck

hey guys, so the other day i opened up the carbs & in the bottom of one of the bowls i found all these yellowy deposits, i cleaned it all off and cleaned down the carbs too, i just removed the jets and sprayed them with white spirits and then used compressed air to blow dry, the interesting thing i found when taking the main jets/holders out is that i noticed the left hand needle was bent a little, will this cause me any major problems or is this just nothing? i also noticed the main jets say 180 on them, but i know my friend who owned it before me drilled them out, im not sure to what size but none the less the bike is running rich and fouls the plugs unless im on wide open throttle, the sleeves in the exhaust have been removed and the snorkels cut so i understand why the main jets were drilled but what is the best way to determine what main jets it actually requires? DYNO? any ideas or help is greatly appreciated, thanx

Hi peter

As far as I know the bent needle wont affect much unless it is no sliding well and rubbing against the needle jet. With the mains, you will just have to start off big and work your way down until the bike is just right. there are no hard and fast rules as to what size main jets to use especially on the 3ma.

Hi Peter;

Luke is right the nedle can eat into the needle jet. Altitude plays a major role (and wind direction ) if you bought the bike inland. If you had 180 original main jets I am betting it is a 3ma1 with 3ma 00 heads you probably have the long connector tube connecting the reed rubber intakes or manifolds. Have you done the airbox modification to assisst with carb removal? If not I suggest doing that because you will be removing the carb a lot to get it setup properly. You can also get rid of the long connector tube just change the reed rubbers around and interconnect them with a short tube.(If necessary)

Having said all of that with carbs clean and float hight at 5-7mm above the bowl, if the bike was running ok no need to change anything she should still be running fine. I will just check if the variable air jets are still functioning and not stuck maybe that causes the richness on part throttle . I had the same model with same mods at altitude I ran 230 mains with needle clip at 2nd from the top. If I follow ndwedwes recomendations I would have had 220 mains on the right 230 on the left. The guys run one jet size bigger on the left to combat heat issues.

Edd

Hi Edd,
yes it is a 3ma01 with 00 barrels, i couldn't see any rubbing marks on the needle jet when i had it out, so fingers crossed it will be ok , i haven't done the airbox mod yet but i plan to on monday at work, your right it does have the long pipe connecting the reed rubbers, i like the idea of removing that long pipe and just turning the reed rubbers around, will do that too,
you talk about setting the float levels, thats something i couldn't figure out when i had them apart, i couldn't see any adjustment screw or clip heights to change the float level, how do you do it? (feel a little stupid),
i also don't know where the adjustable air jets are (or if it has any), so checking to see if they are blocked will be hard as i dont have a clue again, this is my first bike and i'm loving it, growing and learning about it heaps!!
about it running sweet, i'm not sure as it fouls the plugs quite easily if just cruising on the highway, is this normal for a 2 stroke??
thanx so much for the help Edd and guys, will let you know how i get on,
Peter

Float height adjustment: you have to bend the metal tab that comes up against the needle. up or down depending on whether you want to raise or lower the float level. if you need pics then I will gladly take some for you.

VAJ:


If you stay at lower revs for a long time and dont even rev the bike then the plugs will foul up pretty easy. A 2 stoke needs to be ridden hard at least once in a while.

hey Luke,
thanx for the float height adjustment description, i'll do that on monday too, about the vaj, i dont have one on my bike, haven't seen anything like what your picture shows, also where would the vaj system connect to on the carb? with the bike running resaonably rich how else do you get a better air/fuel ratio (besides changing the main jet and needle height), do you do the fixed air jet mod like Warwick or possibly like Louis with the pilot/air screw mod also?
i'm just trying to get the best out of my old little girl, and appreciate all the help.
thanx Luke

Hi Peter;

You must go to a web site called http://www.pure2strokespirit.com it is a member on the forums web site where you will be able to get the workshop manual for your 3ma1. The manual is in Japanese but at least their are pictures and a picture tels a thousand words.There is a picture on how to set the carb float heights .

Sounds like you have a fixed air jets on your carb. If you read the thread on 3ma performance tuning started by Luke you will find a lot of valuable info and pictures their. We did get of the track a little bit and started other conversations in the post but you will be able to get some good info there.

Edd

Hi peter

I am using the fixed air jet mod, but have yet to perfect it because of PV problems. I have not done the pilot jet mod.

Like Edd says read the 3ma1 performance tuning thread, there is a pic there on the first page actually, of the tube that the airjets connect to. It is a cut off tube with an air jet in it.

Hey guys,
so I cleaned up the carbs completely and cleaned up the chokes, they were amazingly gummy and stiff,
so everything is nice and clean and free, i removed the reed rubbers the other day and turned them around
and removed the big rubber pipe connecting them, that mod is so easy to do and it does away with another
unnecessary pipe, refitted the reed rubbers, refitted the carbs, carried out the airbox mod at work and
just brought it home tonight, will fit tomorrow and get the bike running again, stopped off at yamaha on
the way home today also and tried to get a main jet kit (they will phone tomorrow with any luck), im excited to
get the bike back on the road again, and am looking forward to setting up the carbs and getting it running
mint!!
Thanx so much for all the help so far guys, (i'm sure i'll need your help again though), will keep you posted
with what happens along the way.
Peter

Hi,
Worth checking needle valve assembly, I had a problem with fuel collecting in the air intake and found that the rubber o ring had perished on the assembly, causing carbs to overflow slowley, but was told that even during normal running of the 3 Ma, some fuel will collect in the air intake due to the design of the layout of the engine and carbs, never the less it's worth checking them if it's been stood a while.