Question about 2003 Yamaha TT-R 125 LE

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I bought a 2002 yamaha blaster rebuilt top end. New wisco piston and only bored cycl. 20 over. started up second kick. rode great about 3 hrs then parkes it. It ran great. I put 93 gas with yamalube in mix in the oil mix tank. now starts great wont idel well and has a little backfire to it. any ideas? thanks

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Try a new spark plug. Go to a motorsports dealer to purchase a new one as alot of discount or big name store can get a lower grade of sparkplug and this can create alot of grief.

Posted on Feb 03, 2010

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Sounds Like The Carb Is Lean. The 3Hrs. You Rode, Was It Rough Terrain? The Float Got Banged Around And Is Set To Low . Fuel Starvation Worse At High R.P.M. Try Adjusting The Float

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  • Joe Stanton Apr 14, 2013

    Changing Octane Should Not Effect It. I Dont Trust Oil Injection.Install Vinnies Block Off Kit And Mix 24 To 1 Ratio Synthetic Oil.

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1 Answer

Dirtbike kick star


this happened with my sons pw50 where the piston ring had snapped and when it locked it was stuck bewteen the piston & bore

i would seek a shop or mechaninc to look at the top end and isnpect the piston & rings for wear or damage

dont keep kicking as this could result in further damage

Mar 20, 2014 | 2003 Yamaha YZ 125

1 Answer

My 01 yz125,with a Athena big bore kit- i just rebuilt the top end, took it easy with it for the 2 1/2 hrs i rode it...then i went roll up along side my freind and when i pulled the clutch the bike still...


Hi, Anonymous I feel your pain you just dropped a ton of "DRACHMA" on rebuilding all or part of your engine and a couple of hours or days later it dies or locks up and you want me to tell you how much it will cost to fix. Unfortunately due to the magnitude of yesterday's solar flare the batteries in my crystal ball are dead and the circuitry in my mental telepathy headset was melted. Let me break it down for you.
1. Was the work done by an experienced trained professional technician or someone with good intentions that was not qualified to hold a wrench?
2. Was the proper break in procedure explicitly followed using the proper break in oil and changed as directed?
3. If your bike is used for off road abuse or competition there is no warranty in most cases.
4. If you have a street bike that had performance goodies installed no warranty in most cases.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Yamaha YZ125T1 Owner Service Manual
Yamaha YZ125T1 Parts Catalog
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals
Yamaha YZ 125 2002
Yamaha YZ125 Wikipedia

May 27, 2017 | 2003 Yamaha YZ 125

1 Answer

My 01 yz125,with a Athena big bore kit- i just rebuilt the top end, took it easy with it for the 2 1/2 hrs i rode it...then i went roll up along side my freind and when i pulled the clutch the bike still...


Raise the back wheel with a stand and see if it starts and wheel spins. With it still on stand kick down thru gears and see if you really are in neutral. Pull in clutch and try to brake back wheel. To me it sounds like a gearbox issue if you really are in neutral (expensive) but could also be a clutch cable (cheap).

May 27, 2017 | Yamaha Motorcycles

1 Answer

Hi, i recently bought a yamaha blaster 200cc quad bike and when i went out on it i forgotten to put some 2 stroke oil in with the fuel tank, and when out on it. now it wont start, please could you tell me...


you probably seized the engine. The piston rings have most likely scored the cylinder wall. At the very least you will have to rebuild the top end. Oversize rebuild kits are available. You will have to have the cylinder bored to a larger diameter to accept the oversize piston kit.

http://cgi.ebay.com/ebaymotors/Yamaha-Blaster-040-Platinum-Piston-Engine-Rebuild-Kit-_W0QQcmdZViewItemQQhashZitem1c1ad757dbQQitemZ120709404635QQptZMotorsQ5fATVQ5fPartsQ5fAccessories

The crankshaft is also lubricated by the oil in the fuel. There is a possibility that the crankshaft is also toast due to lack of lubrication. You will have to tear the engine down (top end) to verify the damage. you could remove the exhaust and look into the exhaust port to view the condition of the piston.

You may be able to find a used engine at a reasonable cost from the internet. Google search.

Jun 03, 2011 | Yamaha yZF15 Motorcycles

1 Answer

Hi! I just rebuilt my 1974 dt 360 A. and new top end but it smokes badly? new 60 over wisco piston and sent to US Chrome to rework it newly rebuilt crank. all new seals and gaskets. So What Up? can you...


Smoke in a two stroke motor is caused by two things. 1) Even a four stroke will smoke if it has too rich of a mixture or a carburetor that has a malfunctioning choke (a new choke plunger would fix this). Make sure you have a good o-ring on the main jet holder. This was a common problem on old Yamaha two stroke carburetors.2) The type of oil you are using is of a very low grade. Smokeless oils and synthetic oils will smoke less and could solve the problem.
You could just be seeing old residue burning out of the exhaust system, try cleaning the baffle. When you rebuilt the motor did you use a semi drying liquid type gasket material between the two case halves? This would keep transmission oil from leaking into the crankcase. If you have only started the motor in the driveway you may have to just go out for a long drive down the road to clean up all the systems.

Jan 08, 2011 | 1974 Yamaha DT 360

1 Answer

The kick start on my blaster used to work now it just goes to the ground and you can use your hand to do it. are the idler gears bad or is the compression bad? and can a reed valve cause this


If you can turn your engine over by hand easily by pushing down the kick lever, and your not Arnold Schwarzenegger, You have a compression problem. Do a compression check. If your bike has under 100 PSI you need to disassemble the top end , bore or hone the cylinder (depending on condition) and install a new piston, rings, and gaskets. This should fix low compression. If the lever is going down but the motor is not turning over then you need to remove the side cover and check for broken kick gears. Reed valves have nothing to do with this problem.

Jul 21, 2010 | 2002 Yamaha TT-R 250

1 Answer

I have a 1979 Yamaha GT80 that I recently got running, but very poorly. I have rebuilt the carburetor and decoked the top end. It is hard to start and once started, will not idle. When giving it throttle...


did you check the clearances between piston & bore it sounds very much like its time for a rebore & oversize piston that is a top end rebuild rather than just a clean up

Feb 23, 2010 | 1972 Yamaha XS2

2 Answers

My 04 blaster smokes and idles poorly,dies pushing throttle


Hi I am vortash .. firstly 32 - to - 1 may be a tad high I would say ... it would be fine at the same as the ducati ratio 20-to -1 with a good quality oil , you should check that your sump is not filling with oil as this will cause performance problems with backpressure .. but maybe the best thing to do would be to replace the oil pump and run it as it was designed to do ?. I am sure you will get one off the net cheaply or from a local bike breakers .... Regards Vortash

May 18, 2009 | 2003 Yamaha YZ 250

1 Answer

Using oil after 1/2 top end rebuilt what type oil do u rec.


re- strip top end, hone cylinder bore and then re-assemble piston, rings and cylinder dry, yes that's correct use no oil on piston assy. apart from gudgeon pin. Has the valve stem seals been replaced?

Apr 13, 2009 | 2002 Honda XR 200

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