ETZ 250 Inlet

ETZ(including Kanuni), ETS, ES, TS, IFA-RT, BK, Saxon,

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ETZ 250 Inlet

Postby akirasan » Tue Mar 19, 2019 11:51 am

Has anyone replaced the inlet manifold for a shorter straighter one.

Any benefits ????
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Re: ETZ 250 Inlet

Postby DAVID THOMPSON » Tue Mar 19, 2019 4:34 pm

mz was very good a tuning a 2 stroke i would not change anything
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Re: ETZ 250 Inlet

Postby Blurredman » Wed Mar 20, 2019 4:19 am

The problem with that is perhaps location of the carburettor if anything, plus.. airbox..

I'm not sure it's entirely worth it, from carb to barrel, it's fairly straight.
1973 MZ ES250/2 - 17,000 miles
1979 Suzuki TS185ER - 10,000 miles
1981 Honda CX500B - 91,000 miles
1987 MZ ETZ300 - 39,000 miles
1989 MZ ETZ251 - 50,000 miles

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Re: ETZ 250 Inlet

Postby akirasan » Tue Mar 26, 2019 4:41 am

I understand your thoughts but has anyone done it on the road?
Racers do it and i have seen the reed conversion.

But has anyone on here actually done it for a road bike and how did it run?
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Re: ETZ 250 Inlet

Postby Puffs » Tue Mar 26, 2019 9:31 am

No doubt it has been done, also on the road. No, I have not done it.

As always, the most important question is: what do you want to achieve?

You probably found pics of my reed valve elsewhere on this forum; I wanted a broader, less peaky torque band, and that worked. But the carb stayed at exactly the same place, and there were no other mods to the excellent air filter system that the ETZ has. My focus was on usability in day-to-day work.

Shortening the inlet is part of tuning the engine to a higher RPM, in order to increase power output, but IMO you'll end-up with a more nervous engine. Surely quicker (if you get it right, at least), but also quicker to break-down, quicker to the pump, and more difficult to ride (continuously shifting to keep it in a narrow powerband). You'll have to loose the airbox & the rest of the standard inlet tract, and modify that too. Should also include modifying port timings & a tuned expansion exhaust. Racer territory.

Also, I understand that for a tuned inlet length it doesn't matter all that much where the carb sits in the inlet tract; it's the total length that matters.

Anyway, please give it a try & let us know what you find.
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