ETZ(including Kanuni), ETS, ES, TS, IFA-RT, BK, Saxon,
Moderators: DAVID THOMPSON, phlat65
by alexxx » Fri Apr 27, 2018 10:08 am
Hi Folks,
I am considering to fit an OKO carb (Taiwan made)
Seems to be a popular replacement for a lot of bikes, has anyone here tried one?
I contacted the company and they suggested a 28mm carb for the ETZ251 but I am concerned that it would not fit over the carb mounting spigot, is that 30mm OD (or just under) to match the current BVF?
Here is the US website
http://www.usa-oko.com/
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alexxx
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by dirtsurfer » Fri May 04, 2018 12:23 am
I haven't tried one. Is the price similar to Mikuni?
MZochist
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by Puffs » Fri May 04, 2018 3:59 am
Following a biased and flawed moderator choice (someone posting aggressive personal attacks is rewarded, while my technical posts are removed - behind my back & without any justification!), I have withdrawn from this forum.
Last edited by
Puffs on Wed Apr 05, 2023 4:22 am, edited 3 times in total.
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Puffs
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by Blurredman » Fri May 04, 2018 4:24 am
Interestingly,
It does seem apparent that in previous original articles about the MZ's, it looks like they used a "packing" as the original documentation says, in the inlet. They don't mention what type of 'packing' and why it should be installed. I've never used this item and i've got on fine..
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by Puffs » Fri May 04, 2018 4:28 am
Following a biased and flawed moderator choice (someone posting aggressive personal attacks is rewarded, while my technical posts are removed - behind my back & without any justification!), I have withdrawn from this forum.
Last edited by
Puffs on Wed Apr 05, 2023 4:23 am, edited 2 times in total.
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Puffs
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by dirtsurfer » Sat May 05, 2018 2:38 am
Many years ago , some bikes had a thin fibre bush for packing.
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by Puffs » Sat May 05, 2018 4:14 am
Following a biased and flawed moderator choice (someone posting aggressive personal attacks is rewarded, while my technical posts are removed - behind my back & without any justification!), I have withdrawn from this forum.
Last edited by
Puffs on Wed Apr 05, 2023 4:23 am, edited 2 times in total.
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Puffs
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by dirtsurfer » Sun May 06, 2018 10:29 pm
Puffs wrote:.......see below as an example for an alternative I drove a couple of years with (+ shortened inlet skirt).
RV ETZ, top.jpg
RV ETZ, carb side.jpg
That rubber packing really looks like a piece of re-purposed radiator hose and is that a reed valve in the second picture? and Intriguingly use of 8 screws to hold in place!
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by Andy_C » Mon May 07, 2018 3:32 pm
Puffs wrote:I can imagine one would use something like this:
plastic bush.png
or thinner, but on mine it is (and as far as I can see, has always been with this manifold) just metal on metal, with a good fit.
The original manifold has an M6 bolt on either side to clamp the carb's spigot, but the thick alu will not allow for much movement. So the fit will have to be good & hard, if you want to use that original manifold. But of course you don't have to, see below as an example for an alternative I drove a couple of years with (+ shortened inlet skirt).
RV ETZ, top.jpg
RV ETZ, carb side.jpg
Puffs.
So you grafted a reed valve onto the bike - yes?
Can you give us some details - what did the reed valve come from, what changes were made to the porting etc?
Just curious.
Thanks.
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by Puffs » Tue May 08, 2018 3:27 am
Following a moderator choice that is IMO biased and flawed (someone posting aggressive personal attacks is rewarded, while my technical posts are removed), I have withdrawn from this forum.
Last edited by
Puffs on Mon Apr 03, 2023 5:07 am, edited 2 times in total.
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Puffs
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by Andy_C » Tue May 08, 2018 12:17 pm
Puffs,
Thanks for that - I was just curious.
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by dirtsurfer » Tue May 08, 2018 9:11 pm
Puffs wrote:Yeah, so? Radiator hose comes in exactly the right size, is resistant to petrol, reinforced, and very strong. Pray tell: what would you use for the flush spigot of the stock BVF?...
I would use a high quality product
like this one from my local bmw supplier
Puffs wrote: The reeds didn't come from any other bike, I made them for this reed valve, from aramide & epoxy. I made the entire thing, except for the re-purposed radiator hose and the 8 screws, those were made by someone else. I used it for some 4 years.
well done
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by Puffs » Mon May 14, 2018 4:49 am
Following a biased and flawed moderator choice (someone posting aggressive personal attacks is rewarded, while my technical posts are removed - behind my back & without any justification!), I have withdrawn from this forum.
Last edited by
Puffs on Wed Apr 05, 2023 4:23 am, edited 2 times in total.
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Puffs
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by alexxx » Fri Jun 01, 2018 10:00 am
Thanks folks for all the advice and help.
I think I will try one of these carbs as a cheap alternative to a Mikuni.
I have been looking for a used but good Bing to try but no luck
I am basically trying to get rid of the terrible surging on the over run and erratic tick over.
The surging is so bad that on long downhills I have to pull in the clutch.
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alexxx
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by Andy_C » Fri Jun 01, 2018 11:29 am
Alexxx - before spalshing out on a new carb are ypu 100% sure that the existing (BVF) carb is free from any obstructions, and that your timiing is set correctly ?
When I first had my ETZ is used to buck and stutter and was very unpleasant on the overrun, it is pretty good these days. I spent a lot of time fiddling with carb settings - mine has a BVF and it is happiest with 2.5 turns out on the airscrew, and 4 turns out on the bypass screw.
Finally, do you have any leaks in the exhaust system ? Mine used to have a small leak where the silencer joined the downpipe and that had a huge effect on surging - a small leak and it would surge like mad.
Just a few thoughts, whatever you decide to do, good luck.
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