2-stroke engine problem

[Marls]

I need a vague idea of what this problem could be.
Yesterday after taking the bike on a long ride out west auckland to wellsford, and on the way back the bike just lost power , after riding it another 20mins in traffic on state highway1...i got the bike towed home, and then figured out that the one cyclinder wasnt firing, plus there is a knocking sound at idle.
When I disconnect the lead it ran fine on one cyclinder, wen i connect the lead it dies, i opend the plug and cleaned the one with the cyclinder that was not working, and the black fuel left on the plug had fine granules in it....

some one, please, let me knw the bad news, wat must i do to fix?
ths is my first bike and i need some experienced 2stroke advisors...

yamaha TZR250 3xv 92' (maybe sp model) its got dryclutch system
bike just clocked 40k, and i bought it with 39...

[WRT]

What do you mean by fine granules? Are we talking carbon or metal here?

[Ixion]

Well, you're a brave man. Or something. I guess one could find a less suitable bike for a mechanically illiterate novice. If one looked really hard.

At a pure guess, assuming you've done all the obvious stuff, like checking for sparks, bits fallen off, dead rat up the zorst, I'd say you've blown a piston. At least, maybe big end or power valve as well .

At any rate the top end's going to have to come down.

Do, as to what you do to fix it, answer is trailer it to your friendly local Yamaha dealer. Keep the trailer hitched up, you can use it to bring the money to pay the dealer back from the bank

That's two smokers for y'. We luvs them we does

[Conquiztador]

A beer says there is a hole in the piston...

[FilthyLuka]

A beer says there is a hole in the piston...

ill take that bet

[Marls]

What do you mean by fine granules? Are we talking carbon or metal here?

Hard to say, everthng is black, and its fine so i couldnt be sure.

[Marls]

Well, you're a brave man. Or something. I guess one could find a less suitable bike for a mechanically illiterate novice. If one looked really hard.

At a pure guess, assuming you've done all the obvious stuff, like checking for sparks, bits fallen off, dead rat up the zorst, I'd say you've blown a piston. At least, maybe big end or power valve as well .

At any rate the top end's going to have to come down.

Do, as to what you do to fix it, answer is trailer it to your friendly local Yamaha dealer. Keep the trailer hitched up, you can use it to bring the money to pay the dealer back from the bank

That's two smokers for y'. We luvs them we does

lol, crap
now all that fun is paid with frustration...

[Marls]

A beer says there is a hole in the piston...

Remedy? the steps i can take to fix, i got tools, and the bike not goin nowhere.

[k14]

Remedy? the steps i can take to fix, i got tools, and the bike not goin nowhere.

Pull the head. First you will need to drain the coolant and then you can undo the head bolts (should be 5 or 6) of the cylinder that is not running and you should be able to see what is wrong.

First though, to determine if the cylinder has no compression. Take both plugs out and then put your hand over the plug hole on the cylinder you think is dodgy. Then turn the bike over by hand using the kick starter and you will soon know if there is any compression. If you can't feel anything pushing your hand then you will probably need a new piston or maybe more.

Check that out and report back.

[tri boy]

Head and Barrels off. Then you'll know. But any sign of dusty black deposits has me agreeing with Ixion.
You will enjoy the learning experience. (maybe not the $ depletion).
Fingers crossed for a simple Piston/Ring job.

[Conquiztador]

ill take that bet

U'r on. Steinlager pleeze...

[Conquiztador]

Remedy? the steps i can take to fix, i got tools, and the bike not goin nowhere.

Ten first steps in order:

1. Kids and missus away for the day.

2. Get 1/2 doz of favorite beer.

3. Phone off hook and battery out of mobile.

4. Clean up workshop so you have space and all tools are where you know they are.

5. Bike on central stand.

6. Plugs out.

7. Open first beer.

8. Finger in holes (one side at time) and turn motor over. You are looking for difference between the good one (air is pushed out past finger no matter how hard you push the finger in, a little like trying to stop a fart...) and the bad one (no such adrenalin pumping excitement)

9. Time to sit down and do some thinking. Here the beer you opened at #7 comes handy.

10. If there is a difference then head off. (Not yours or the beers but the bikes) Others have already told you what to do here. But if you are noob to this, then get a mate who also enjoys beer or buy a manual before starting. You will also need a torque wrench when re-assembling after all your beer money has gone on a new piston)


Good Luck!!

[Richard Mc F]

Ooooh Ooooh can I join in ?

You may have got real lucky and run a big end.......try somthing magnetic on the granules and see if they stick to it.............if they do you have.........may god have mercy on your wallet

ps if you want a true cynic to look at it pm me

[Marls]

Pull the head. First you will need to drain the coolant and then you can undo the head bolts (should be 5 or 6) of the cylinder that is not running and you should be able to see what is wrong.

First though, to determine if the cylinder has no compression. Take both plugs out and then put your hand over the plug hole on the cylinder you think is dodgy. Then turn the bike over by hand using the kick starter and you will soon know if there is any compression. If you can't feel anything pushing your hand then you will probably need a new piston or maybe more.

Check that out and report back.

Ok, lower cyclinder has no compression, acording to the finger test, ther is noticable difference between the two wen turning the engine over,
ill attempt at opening the head later today, and take a look at the piston, where can I go buy new pistons and parts from?
and what else would u recomend i change while its in peices..?

[Pancakes]

Pictures would be good for us following your adventure.