Engine swap from TS250/1 to 250 ETZ

[Rob NL]

Hi All,

My TS 250/1 has a worn engine.
I've been offered to buy a ETZ 250 engine.

I always thought these both engines are somewhat the same, but I want to make sure before buying one.
So what is needed to fit it into my 1979 TS250/1? Is it plug and play? What are the differences between a TS angine and an ETZ engine? (besides ignition).
What adjustments are needed?

Thanks in advance!

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[Kruh]

Yeah, especially since you've got the 5 speed transmission. The etz and ts/1 have pretty much the same transmission, clutch, etc. So you won't gain anything there. The slight power increase of the etz, from what I hear isn't that benefitial. In fact people prefer the TS because of its low end power. Not to mention, you will probably need the etz exhaust if you want the best performance. Although, not sure how the ts would affect it.
I'd personally just get it rebuilt. Pretty sure it wouldn't be more expensive, considering something on the etz engine might require attention.

I do think, as well, that the engines are very similar. I imagine the rear mounts would fit.
But I do know for a fact, that the etz cylinder is bigger in size. Therefore, when put on a TS it sits angeled down and might be an issue with fitment of that rubber mount. Also it might affect the pipe.
Personally, the etz engine looks quite out of place on the ts, and it doesn't fit the look of that bike at all.
There is a fair amount of photos of TSs with etz engines.

[Rob NL]

Thank you for your answers. The original engine is not lost. It needs some new sealings, bearings and a new crankshaft (and probably new cilinder/piston). So, actually it needs a rebuild. I'm pretty sure it can be done, but I'm not sure it can be done by me

So I think it is easier for me to just replace it with another engine.
I'd checked some pictures and most important parts looks like the same or easy to adjust to fit with TS parts. It looks like the exhaust will fit also. TS downpipe looks a bit more bended though.

I think I'll ask the guy for what price he will sell and if he can say anything about the state (he has 5 of them). And if the price is right I'll give it a try.
And otherwise I'll rebuild my original with some help of a real mechanic.

It does look a bit "different" I agree...

[Kruh]

I see, fair enough. Once you add the labour to the price... Hard to disccuss until you know the true extent of the damage. There is a chance that the engine is better than you think. From what I can tell, you haven't had the engine apart, so the crank might be just fine, maybe even the cylinder. Maybe all it needs are new seals and bearing.

The downpipe isn't an issue, since it mounts under the ignition cover. What happens beetwen that clamp and cylinder doesn't matter. It would mean that an etz downpipe is requeride atleast. Only thing to think about is the angle of the pipe at the clamp. Pretty sure its flat like the ts, so its probaply not an issue.

[Rob NL]

I've found this topic by the way:
https://mzriders.com/viewtopic.php?f=5&t=2941

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[Guesi]

Don´t forget that you have to change all electrical parts to 12 V.
ETZ engine and alternator has 12 V. So you need a Battery, rectifier, regulator, bulbs etc.

[Rob NL]

But you probably won't really know what you're buying - may get lucky, may get burned.

That I know. But it can hardly be any worse than what I have now

Don´t forget that you have to change all electrical parts to 12 V.
ETZ engine and alternator has 12 V. So you need a Battery, rectifier, regulator, bulbs etc.

Original TS alternator will never fit? Good to know!

[Rob NL]

I didn't hear anything from the guy with the ETZ engine.
So I've decided to start dismantling the engine myself and see how far I will get myself in refurbishing the engine.

It means I need some specific tools to split the engine.
Does anyone know this guy?
https://sprzedajemy.pl/mz-etz-250-narze ... nr62513163

He's offering these tools for around 100 euros.

[Blurredman]

The only tool you really need is the clutch puller. All the other items just make it nicer to do..

I've also considered buying such kits, but alas the clutch puller, and an improvised crankcase splitter (just a long piece of metal with some holes in it), is all you actually need/want...

[Guesi]

The polish guy wanted more than 1000 Euro for the toolset.

A good clutch extractor costs about 35-40 Euro. The cheap ones are avaiable for 5-6 Euro, but with these you ruin your crankshaft or maybe more.

The "Montagebrücke" costs about 80-90 Euro and makes many things easier on dismantling and reassembling the engine.

But the only thing you really need is a good clutch extractor. All other tools make it easier.

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[Rob NL]

Thanks for the advice.
I figured out already that the puller is the most important.
I've also been thinking of making a bridge myself, can't go anyware anyway. :S

The polish guy wanted more than 1000 Euro for the toolset.

Strange, he offered me the whole set for 450 polish money (~100 euro).
Last summer I ordered some parts at your website, so If I can't anything close to home I know where to look

[Guesi]

The offer on the link to the polish seller says that the price ist for the bridge. Not all the tools.