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Post by jdl357 on Oct 22, 2017 19:10:04 GMT -5
What size oko or pwk flat side carb should I go for with a 70cc bbk, Malossi wild lion pipe, stock airbox snorkel removed?
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Post by ryan_ott on Oct 22, 2017 20:32:30 GMT -5
The PWK is a large carb and won’t just “fit” without some persuasion, different intake, modified and possibly new brackets for the stock box. I’d go with a PHBG, and this is coming from an old Keihin guy. They are easier to setup with a stock airbox. 19mm should suit you just fine, 21 if you want room to grow in the future.
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Post by jdl357 on Oct 22, 2017 20:54:31 GMT -5
Yeah, I've got a phbg 21 clone now but it's messed up due to stripped bowl screws. It never runs right. I just noticed the okos and pwks are pretty cheap on eBay but don't know much about them. Is there any other carb besides a phbg you'd recommend that's not very expensive that would fit?
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Post by ryan_ott on Oct 22, 2017 21:07:05 GMT -5
Here is a genuine PHBG for cheaper. To have trouble free tuning I only believe in genuine carbs. I’ve never had good luck with the cheap copies. You could also look into the 17.5 phva Dellorto. www.ebay.com/i/221722551626 |
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Post by tsimi on Oct 22, 2017 22:07:50 GMT -5
PHBG clones are from what I read a hit or miss kinda thing. A genuine PHBG would be preferable.
As Ryan mentioned, PWK carbs are lot bigger then the PHBGs.
No matter the carb size the PWK body is always the same. Different intake, different throttle cable and a DIY custom adapter to fit the stock box. Worst case you might have to cut something away from the seat bucket to fit the PWK in there.
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Post by benji on Oct 22, 2017 22:36:37 GMT -5
30mm chromed-out oko. Go big or go home.
All Kidding aside, it's kinda up to you. I'm currently running a mikuni vm26 and it's way to big but a cheap and reliable carb that's fairly easy to tune. Along time ago a guy who claimed to have a 90cc race motor said his 19mm phbg was actually too big in his opinion, ran better with a 17.5mm
I ran a 21mm pwk for along time on a Honda af05 with a 65cc kit. Sucked gas but ran great.
It seems like the phbg's work good when you have a good one, like a dellorto or mikuni or other reputable brand. The upside is not having to change everything to get it to fit.
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Post by gsx600racer on Oct 26, 2017 17:36:56 GMT -5
First, there are "OKO" carbs and then there are "Clone OKO" carbs. www.mid-atlantictrials.com/Copies.htmlIf you have a clone, good luck tuning. For mild 70cc builds,19-21mm will give you good all around performance.  |
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Post by pigkut on Nov 15, 2017 20:51:18 GMT -5
I run a 21mm dell clone with genuine internals except the slide with good success.
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Post by repherence2 on Nov 20, 2017 22:29:03 GMT -5
get the OKO 24  I ran a Polini CP 24 with stock rear facing manifold and air box for 70cc kits. the shop that I bought the Polini from also had a transition adapter to for the carb mouth to the air box rubber hose. later i bought a OKO clone 26 with power jet and the "performance" forward facing intake manifold, no air box. I have had success with the OKO clone, but it took a lot of tuning. I bought a huge assortment of main jets and a few pilot jets to get it tuned. tach and temp gage makes carb tuning a lot easier. |
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Post by fugaziiv on Nov 21, 2017 9:07:08 GMT -5
If it's an OKO, it's cheap and it's on Ebay... it's a knockoff. Don't buy that. You're just throwing money away at that point as you'll never be able to tune it. We're the US importer of authentic OKO. You don't have to buy if from us directly, but make sure that carb came out of our warehouse. That way you'll know.
Matt
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Post by repherence2 on Nov 21, 2017 21:03:20 GMT -5
If it's and OKO, it's cheap and it's on Ebay... it's a knockoff. Don't buy that. You're just throwing money away at that point as you'll never be able to tune it. We're the US importer of authentic OKO. You don't have to buy if from us directly, but make sure that carb came out of our warehouse. That way you'll know. Matt The OKO clone is tunable, but it takes a lot of time and patience. Lots of headaches. The power jet was wonderful at full throttle once I understood the concept. I'm currently running a genuine OKO 28 on a 54mm bore. It's big, sucks a lot of gas, and it took some time to get the mid range throttle smoothed out. Genuine OKO carbs are quite cheap here in Hawaii. The OKO clones are much more cheaper too. Clones can work, but it can be a headache to get it tuned properly. |
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Post by fugaziiv on Nov 22, 2017 10:13:34 GMT -5
If it's and OKO, it's cheap and it's on Ebay... it's a knockoff. Don't buy that. You're just throwing money away at that point as you'll never be able to tune it. We're the US importer of authentic OKO. You don't have to buy if from us directly, but make sure that carb came out of our warehouse. That way you'll know. Matt The OKO clone is tunable, but it takes a lot of time and patience. Lots of headaches. The power jet was wonderful at full throttle once I understood the concept. I'm currently running a genuine OKO 28 on a 54mm bore. It's big, sucks a lot of gas, and it took some time to get the mid range throttle smoothed out. Genuine OKO carbs are quite cheap here in Hawaii. The OKO clones are much more cheaper too. Clones can work, but it can be a headache to get it tuned properly. The OKO knockoffs are known to have a casting flaw that makes tuning very difficult. The genuine OKO product has fixed this but the knockoffs still use the old design. Matt |
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Post by repherence2 on Nov 23, 2017 12:05:41 GMT -5
.[/quote]
The OKO knockoffs are known to have a casting flaw that makes tuning very difficult. The genuine OKO product has fixed this but the knockoffs still use the old design.
Matt[/quote]
So true! It took me a few days to get the Clone tuned and smoothed out. But once it's there, it works fine. Hindsight, the Clone is a headache. The Genuine oko is Easier to tune. Plus, the Clone was only $40 bucks when I bought it.
The good thing about it all is that the Clone is such a pain to tune properly, you need determination and persistence. I learned a lot about jets and carb tuning because of the Clone and now I'm way better at carb tuning because of the struggles.
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Post by ThaiGyro on Nov 23, 2017 22:19:10 GMT -5
HI again repherence2, I do like that you have tried with the lesser clones. Us too, as Thailand gets parts easily from China/Taiwan/Japan...and actually make some for many manufacturers.
In another similar thread, we discussed this. When we do assemblies on carb parts, clone or not, we use thread sealers on nearly everything. Nyloc or RK, there are many. Not everything is fuel compatable, but air is no issue that we have found. None that work well become permanent in our experience, so you must be careful during assembly/disassembly.
The nice thing about little tubes of goo, is that you can do a quicky road repair, when needed. Often we just need a wrap of teflon tape to make a proper fit.
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Post by pete130 on Jan 1, 2018 2:03:34 GMT -5
Here's a lot at carb and jet size for 28,30,32and 34mm koso hope it helps someone
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I ran a Polini CP 24 with stock rear facing manifold and air box for 70cc kits. the shop that I bought the Polini from also had a transition adapter to for the carb mouth to the air box rubber hose. later i bought a OKO clone 26 with power jet and the "performance" forward facing intake manifold, no air box. I have had success with the OKO clone, but it took a lot of tuning. I bought a huge assortment of main jets and a few pilot jets to get it tuned. tach and temp gage makes carb tuning a lot easier.
