MZ/MuZ Riders
A community for owners and riders or MZ Motorcycles, Scooters, and ATVs.
OKO carb for ETZ251
Moderators: DAVID THOMPSON, phlat65
38 posts
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Koso carb for ETZ251!
by Puffs » Fri May 08, 2020 4:01 am
Removed
Last edited by Puffs on Mon Jan 06, 2025 7:10 am, edited 2 times in total.
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Puffs - Posts: 2008
- Joined: Tue Jan 16, 2018 11:20 am
- Location: Ardennes, Belgium.
Koso carb for ETZ251
by Puffs » Wed May 13, 2020 10:01 am
Removed
Last edited by Puffs on Mon Jan 06, 2025 7:10 am, edited 2 times in total.
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Puffs - Posts: 2008
- Joined: Tue Jan 16, 2018 11:20 am
- Location: Ardennes, Belgium.
Re: OKO carb for ETZ251
by Blurredman » Thu May 14, 2020 6:09 am
And yet I thought a plug that looked like that was too lean? 
1973 MZ ES250/2 - 17,000 miles
1979 Suzuki TS185ER - 9,000 miles
1981 Honda CX500B - 91,000 miles
1987 MZ ETZ300 - 38,000 miles
1989 MZ ETZ251 - 50,000 miles
ftp://blurredmanswebsite.ddns.net/Vehicle_Documents/MZ_Documents/
1979 Suzuki TS185ER - 9,000 miles
1981 Honda CX500B - 91,000 miles
1987 MZ ETZ300 - 38,000 miles
1989 MZ ETZ251 - 50,000 miles
ftp://blurredmanswebsite.ddns.net/Vehicle_Documents/MZ_Documents/
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Blurredman - Posts: 1253
- Joined: Sat Feb 09, 2013 3:59 pm
- Location: South Wales
Re: OKO carb for ETZ251
by Puffs » Fri May 15, 2020 4:40 am
Removed
Last edited by Puffs on Mon Jan 06, 2025 7:10 am, edited 2 times in total.
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Puffs - Posts: 2008
- Joined: Tue Jan 16, 2018 11:20 am
- Location: Ardennes, Belgium.
More on carb tuning & plug reading
by Puffs » Sat May 23, 2020 6:56 am
Removed
Last edited by Puffs on Mon Jan 06, 2025 7:10 am, edited 2 times in total.
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Puffs - Posts: 2008
- Joined: Tue Jan 16, 2018 11:20 am
- Location: Ardennes, Belgium.
Re: OKO carb for ETZ251
by alexxx » Tue Apr 13, 2021 7:45 pm
Great work Puffs,
Your koso carb is the same as the OKO I bought, they are all Kehin clones.
I bought the made in Taiwan model as they are meant to be the best of the clones. (http://www.mid-atlantictrials.com/Sales.html)
Good web site with lots of helpful set up info.
I fitted two of those OKO carbs on a T140 I have and they are fantastic, easy to tune and very cheap for the hex jets, also a nice light throttle, the small size helps a lot.
I expect the same results as you when I fit the OKO but the ability to be able to tune the carb with the huge variety of jets could make it a better carb to live with.
My OKO is a 30mm, I chose that as I am not intetested in a higher top speed and lesser dia could help the bottom end a bit more..I think.
I will have to buy another inlet manifold to modify.
Regards
Your koso carb is the same as the OKO I bought, they are all Kehin clones.
I bought the made in Taiwan model as they are meant to be the best of the clones. (http://www.mid-atlantictrials.com/Sales.html)
Good web site with lots of helpful set up info.
I fitted two of those OKO carbs on a T140 I have and they are fantastic, easy to tune and very cheap for the hex jets, also a nice light throttle, the small size helps a lot.
I expect the same results as you when I fit the OKO but the ability to be able to tune the carb with the huge variety of jets could make it a better carb to live with.
My OKO is a 30mm, I chose that as I am not intetested in a higher top speed and lesser dia could help the bottom end a bit more..I think.
I will have to buy another inlet manifold to modify.
Regards
- alexxx
- Posts: 120
- Joined: Sat Mar 04, 2017 8:06 am
- Location: Edinburgh Scotland
Re: OKO carb for ETZ251
by Puffs » Wed Apr 14, 2021 4:54 am
Removed
Last edited by Puffs on Mon Jan 06, 2025 7:11 am, edited 2 times in total.
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Puffs - Posts: 2008
- Joined: Tue Jan 16, 2018 11:20 am
- Location: Ardennes, Belgium.
Re: OKO carb for ETZ251
by Kruh » Wed Apr 14, 2021 8:16 am
When I had the 30 mm OKO version, i too found the power jet not making a whole lot of difference.
I think MZ are just too low revving to take advantage of that. In fact I almost never find myself going over 3/4 throttle, even at harder accelerations.
I've also seen people installing 28 mm carbs on 250 MZs. And they seem to be plenty. While offering better low end performance due to the intake resonace shifting lower in the revs. I assume the increased velocity might help tuning as well.
Although, I'm very happy with my current version of the 30 mm (ZSDTRP).
I think MZ are just too low revving to take advantage of that. In fact I almost never find myself going over 3/4 throttle, even at harder accelerations.
I've also seen people installing 28 mm carbs on 250 MZs. And they seem to be plenty. While offering better low end performance due to the intake resonace shifting lower in the revs. I assume the increased velocity might help tuning as well.
Although, I'm very happy with my current version of the 30 mm (ZSDTRP).
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Kruh - Posts: 149
- Joined: Tue Nov 26, 2019 4:15 am
- Location: In the shed
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