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Tuning 2 stroke - 2003 ATK 250

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Hi, Anonymous for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix or parts inquiry. If necessary transport your vehicle to the dealer or shop and have a professional technician take it for a test drive, if it is in running condition, and give you a written estimate of repairs and answer any specific questions you may have about your issue. For more information about your issue please visit the website below. Good luck and have a nice day.

Posted on Oct 31, 2015

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How do I set timing?

I don't think mercury has changed their engines much in the past few decades with the exception of the newer high tech & 4-strokes. You can probably get the procedure from a shop manual that covers their 2-stroke 65hp from the 90's or later. The easy part is that with it being a 2-stroke there will only be 1 top dead center as opposed to a 4-stoke which appears to have 2 until you figure out if the rotor is pointed 180 degrees the wrong way. The only other thing you need to know is which cylinder is #1. Bring that cylinder all the way up. The markings will be on the fly wheel and the engine block. What's left... a few degree before or after. You should be able to get it going with some trial & error & maybe fine tune it by ear. I did this with a Mercruiser & found out I had it perfect 5 years later when I got the shop manual. Good luck.

Aug 24, 2015 | Cars & Trucks


How to tune / de-restrict a 2 stroke

2 strokes in lower ccs are usualy slow, so heres a list of things you can do to de-restrict and tune your 2 stroke.

1) Get a racing exhaust, Key part too most 2 strokes is a good exhaust, this will remove some restrictions. Gianelli, Big One, fmf and many others are available on ebay or your local bike shop.

2) Big Bore kit, adding a big bore kit can give up to 30% more performance, and will usualy de-restrict the bike. search ebay for (Bike Model) (year) Big Bore kit. it will come usualy with everything you need for the upgrade.

3) Carbon Reed Valves, are a key part too your acceleration, also removing the little cages that stop them opening all the way and replacing with big washers is another good step, make sure theres nothing for your reeds to nock on when removing the cage.

4) Boost Bottle, a boost bottle will help 2 strokes with no reed valves more then reeded bikes but will give alot more low and high end performace. search ebay for (bikes cc) boost bottle.

5) Jets, are a key thing when getting a bore kit or race exhaust. you MUST change the jets if you change exhaust, get bigger ones if you get an exhaust go a few sizes over and check the spark plug if its a brown tan/ grey collor you got it all right, if its black it means you have to much fuel so go smaller, and if its white it usualy means not enough fuel. you can buy jets from any motorcycle shop usualy around $1 a peice. you onyl need to change the Main jet.

6) Air Filter, you dont need it on most bikes but it could add extra acceleration, measure your carbeurator intake and search it on ebay for a K&N style filter, Power filter.

7) Restrictors in the intake, some 2 strokes have restrictors between the carb and the cylinder, it is key to remove these or drill them out to the size of the carb/ cylinder hole size.

8) Sprockets, if your lucky enough to have a chain and sprockets, its a nice trick to change sprockets on your bike.
For Top Speed - Bigger front sprocket & smaller rear sprocket
For Acceleration - Smaller front sprocket & bigger rear sprocket
by bigger or smaller i mean more or less teeth on the sprocket. if you go for speed your acceleration will lack and vice versa if you go for acceleration you will loose top speed.

9) Electical Restriction, Some bikes are restricted in the CDI, if yours does not want to reach a good RPM search up CDI, de-restriction. usualy it involves cutting a wire between the CDI and engine. and will unlock that slow engine into a screaming 2 stroke.

If you follow all these steps your 2 stroke will no longer be restricted and slow and will be the fastest arround.

on Feb 16, 2010 | Motorcycles

1 Answer

Yung honda ko may usok parang two stroke ang usok

1. carb tuning air/fuel mixture
2. sobra sa langis dapat 1 litre lang
3. blow by ka na , halo na langis sa combustion chamber

Aug 25, 2013 | 2005 Honda CG 150 Titan ESD

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Yamaha wr125r 2012

Yes. Spend 1500 GBP on the parts and then fit them. You will need to replace the exhaust and the ECU and as you will have spent a lot of money on it already you will have about another 4 bhp. To get anymore you will need to get a tweaked head and cam plus a bore and piston kit to take the engine out to about 185cc. You would be better selling your bike and spending the extra money on a bigger machine or an older one. The Yamaha RD125DX has 16bhp and the early RD125LC made 21bhp. If you really want to tune an engine you should look for a 2 stroke. Tuning is easier and cheaper than 4 strokes. With 4 stokes the tuning involves cam timing and head and piston crown shape.

Jun 08, 2013 | Motorcycles

1 Answer

What speed,dudy,volts be at for shading and lineing

depends on the work. 12v or so with a well tuned machine and a fast stroke of the hand along with good washing skills will produce really smooth shading. The bugpin rounded shader mags are also pretty legit. Lining should be 6-8v depending on your tuning. maybe higher if you line better with fast strokes. be careful though. high voltage comes with high heat if youre not tuned right. the stroke depth is also really important. with a liner my stroke is around 3.8mm while my shader is set at almost 5mm which is deep for some artists but i like to see the needle since i only use 11 diamond tips for lining if it were a tight fitting round tip i wouldn't really need to see the needle as much. so different strokes for different folks. Remember though, Darker is DEEPER and lighter is shallow. but never go too deep. no one likes a blow out. -Professional tattoo artist- Brian @ Foxy Tattoos, Raleigh NC

Feb 04, 2012 | ART Cast Iron Coil Tattoo Machine Liner &...

1 Answer

Where is a power band at on a 2 sttroke

The 'poer band' is not an object in the engine. It is a term that refers to the RPM range in which an engine produces the most power. All engines have a power band but it is a term that is most commonly associated with a two stroke because almost all other engines have a very smooth transition of power yet the tuned, performance 2-stroke engine has a very clearly defined RPM range where it produces substantially more power - hence the term.

The power band in a 2-stroke is typically in the upper RPM but it can be moved and altered by changing the compression of the engine, the weight of the flywheel, the carburetors settings, the port timing of the cylinder, the shape of the combustion chamber and the exhaust tract among other less popular mechanical alterations.

I hope this clears things up.

Oct 23, 2011 | 2003 Yamaha YZ 125

1 Answer

Carby tune up air/fuel mixture screws how many turns in/out Idle screw turns in/out

Make sure the fuel filter, air cleaner, and muffler are not clogged. Turn both jet screws CW to stops (lightly), then back out 1-1/2 turns CCW each. This is a basic setting which should allow the engine to start and run. Allow the engine to warm up, then pull the throttle full on--it should be 4-stroking. Turn the H screw CW until the engine speeds up somewhat, but still 4-stroking. Proper setting is 4-stroking unloaded, but immediate 2-stroking when cutting. Release the throttle and adjust L CW until the engine runs fairly smoothly, yet allows the engine to 'follow-the-throttle'. Set idle speed screw so that the chain stops turning, but the engine continues to run. Hope this helps!

Jun 07, 2010 | Garden

1 Answer

Hi how to tune homelite 330 chain saw carby, idle

Before adjusting anything, check the fuel filter, air filter, and muffler for plugging. Check the condition of the fuel lines for decay or other damage. Tighten all carburetor fasteners. Make sure you have fresh fuel mix in the tank. Does the primer bulb pull fresh fuel into itself when pumped? Turn both jet screws CW to stops (lightly), then back out CCW 1-1/2 turns each. This is a basic setting and should allow the engine to start and run. Start the engine and allow it to warm up, then pull the throttle full on. Adjust H needle CW until the engine starts to speed up, but still 4-stroking. Proper final adjustment is when the engine 4-strokes unloaded, but immediately 2-strokes when cutting. Release the throttle and adjust L needle CW for fairly good idle, but still allows the engine to 'follow the throttle'. Adjust idle speed screw so that the chain stops turning, but the engine will continue to run. Hope this helps!

May 09, 2010 | Homelite ZR10926 16" Chain Saw

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Tune a ryobi two stroke motor

Turn Both Air Mixture Screws In Until Seated. **DO NOT JAM SNUG ONLY** Turn Both Screws Out 1 1/2 Turns. Set the Throttle to Full Open and Start the Engine. Override the Throttle by Pushing the Governor Arm by Hand and Turn the High Air Mixture Screw(bottom of the bowl) In Until the Engine is Revving Properly. Now Slow Engine to Idle. Set the Low Air Mixture Screw so there is No Hesitation when Throttling from Idle to Full Throttle. Now Set the Idle if Required.

Nov 09, 2009 | Electronics - Others

1 Answer

Loss of power...

hi kev,

thank you for using fixya.

i'm a 2-stroke fan myself, all my bikes are 2 stroke. with the issue you currently have, i would say that the culprit will be the following.

1. carb mixture for oil, air and gas. you may need to have this tuned making sure that the 2-t oil is not more than the gas.

2. body {background-color: #FFFFFF;font-family: "Verdana"; font-size: x-small;} p { margin: 0px 0px 0px 0px; } overheating, there are many points for a 2 stroke engine to overheat even on in idle, one reason is too much oil or too little oil (transmission oil that is). when it overheats, the gas/oil/air mixture will be heated and too denced to burn, leaving it with low combustion and smokey burn.

best way to get through this is to check your piston and rings of any scratch for a possible blow by, and have parts replaced if possible. for the carburator, just set the timing and the tuning to 1:4:5.

should you have other questions, please let me know.



Apr 20, 2009 | Yamaha DT 125 R Motorcycles

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