2 Stroke Question?

[Jenks]

Hey all, Im quite new to the world of 2 strokes -so this might seem abit stupid!

Basically. i have a 1978 MZ TS 250... - Runs on Premix 2t.

Now when i first got it, it smoked like a crack whore...

Now since i emptied the fuel and put a fresh load in with the correct mix, it really hardly seems to smoke. In fact ive videoed my friend on it down the road, and there is no smoke at all..

Is this bad? Good? I thought they were 2 smokes for a reason??

Any help would be brilliant!!!
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1978 MZ TS 250 1 Supa 5
1992 yamaha fzr1000 exup
1998 aprilia af1 sintesi

[Ant132]

Mine runs on an oil pump at the correct ratio. In the morning it smokes a fair bit, and will continue to smoke for the first 10-20 seconds of riding after a full warm up, then throughout the rest of the day there will be no smoke at all.

If you're worried about it, it might be worth increasing the ratio of 2-stroke oil just for peace of mind. They all smoke, so being able to see some just for your own benefit would be better than having none at all. Always good to have a bit too much than not enough

Ant
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1980 Suzuki TS50 ~ 1984 Honda CB400N ~ 1992 Triumph Trident ~ 1998 Suzuki Bandit 1200

[mca6969]

yeh when i first start my engine it smokes like a bitch but as it warms up i dnt think i can see it sooo
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Yamaha Aerox 07 Rossi rep De restricted variator + polini belt

[Frost]

when warm its normally best to check for smoke with your nose

[tutton]

My 50 dosnt smoke at all really, 8 months and hasnt seized yet
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Past: '05 Peugeot XPS '99 Aprillia RS125 '94 FZR600R
Current: '02 ZX636 A1P '51 CCM R30

[ms51ves3]

My scooter leaves a nice cloud as I set off but once I'm at the end of my road (about 150 metres) it's stopped.

My dad's scooter is the same as mine, smokes a bit then disappears at the end of the road.

My RX-S smokes until it's warmed up then it's smokeless. Used to smoke a shed load until I adjusted my oil pump.

My dad's RD 250 smokes a little bit and on full throttle smokes a fair bit (It looks cool as it comes out in a twirl and smells nice ) yet his oil seems to last him ages.

I wouldn't worry if it's not smoking but if you are just increase the premix ratio.

[petemell]

Too much oil can cause the bike to run lean, as more oil means less petrol in the mixture.

It may be ok but it could make the engine run hotter using extra 2t oil.

[cal91]

i belive it might be to do with the ratio before being incorrect. Maybe to much oil.

But mine is the same, smokes more than a old double decker bus when cold but after 30 secs its usally clear.
It might be to do with the engine warming the gases after 30secs so they are clear.

I wouldnt be too bothered about it tbh. As long as the its the correct ratio to whats on the oil bottle it should be fine.
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We are the Patriots! Love your country.

[Jenks]

Awesome, Thanks!

Ill drop it out then and use another mix!
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1978 MZ TS 250 1 Supa 5
1992 yamaha fzr1000 exup
1998 aprilia af1 sintesi

[cal91]

[ms51ves3]

[cal91]

[quote="ms51ves3
If he hadn't mixed it properly the engine would have seized from lack of oil.[/quote]

i think its more oil if there more smoke.
____________________
We are the Patriots! Love your country.

[Gazdaman]

If you've got the petrol to oil ratio correct it won't actually smoke all that much.

Too much oil = loads of smoke.
It normally smokes a bit when it's cold, and when accelerating hard.

My MZ barely smoked when it was on the oil pump. Smoked like hell when I ran premix as a race bike, but I suspect I cocked up the sums.

Gaz

[Rockhopper]

Too much oil also makes your mixture lean and you risk siezing it that was as well!

[smegballs]

My MZ ETZ250 hardly smokes at all when I use the correctly measured amount of oil and is warmed up. Usually tho i tend to approximate a bit rather than the using the measuring bottle so runs smokeyish but nothing like a proper screen.

I always mix a little bit overoiled than underoiled, altho over oiled can be just as bad as under oiled. This is because the oil displaces a similar volume of petrol. As the mixtur is sucked thru into the crankcases most of the oil drops out of suspension and onto the big-ends, mains etc as in normal 2t lubrication

As now there is a disproportionate amount of air to petrol now (too much air), hence running weak. Your engine will have a tendency to overheat and hole your piston.

Fun times abound for everyone.

Also what do other people think of the MZ oil pumps, mine has been converted to premix as apparently the MZ pumps have a reputation for failing hence its safer to have your oil in the tank.,

Hope this helps

Rich

[Jenks]

thanks

Mines the TS so i dont have the oil pump!
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1978 MZ TS 250 1 Supa 5
1992 yamaha fzr1000 exup
1998 aprilia af1 sintesi

[Gazdaman]

I used to trust my ETZ 251 oil pump implicitly.

Same with the ETZ 125. Never had a problem.

Gaz

[smegballs]

Is your TS the Supa5??

Apparently the Supa5 engine was more powerful and torquey than my ETZ 250 block.

I would be interested to see if a Supa5 block would find its way into my frame or whether the engine mounts are different

[salty21]

[69.9mph]

[69.9mph]

[salty21]

one guy said more oil will make the engine overheat and the other said too much oil would seize the engine, im not saying im a mechanical god but i definately wouldn't say a mix with too much oil would do either of these.
so they have either been seriously mislead or just like to guess in the hope that they may look knowledgefull, as for "practice what you preach". the theoretically lean mix in which you speak of will cause no serious damage to the engine therefore was not in my interest to incorporate in my previous post.
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04 NSR 125(sold) ---- 03 CBR 600rr(sold) ----90 pan euro ST1100 '' ----02 CG 125
94 CB400 Super Four ---- 2000 VTR SP1 (sold) ---- 08 ninja p8f(sold, meh) ----05 CBR600rr

[Gazdaman]

Salty21...

A lean mixture runs hotter. A piston will expand and heat seize. Therefore both overheating and seizing.

So please, if you don't know. Don't post.

Gaz

[salty21]

did you even read the posts wally if you did you would see that is what i am trying to say ffs
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04 NSR 125(sold) ---- 03 CBR 600rr(sold) ----90 pan euro ST1100 '' ----02 CG 125
94 CB400 Super Four ---- 2000 VTR SP1 (sold) ---- 08 ninja p8f(sold, meh) ----05 CBR600rr

[Gazdaman]