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Post by superbrita on Jun 13, 2019 15:52:38 GMT -5
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Post by ThaiGyro on Jun 13, 2019 19:46:33 GMT -5
Hmmm, curious numbers/letters. No zero there. The right, lower symbol could be a "6". The box symbol? dunno. The symbol by itself...looks like a "4". 70 = 七十 In Japan, all numerals are the same as China. I found nothing for the rectangular box... Curious though...a slotted brass jet in a Mikuni, with Chinese stampings...from a 16mm carb. Is it one of these?    I sent your photo to a mechanic/engineer in China to see what she can offer. Regardless of what it is...or isn't, with a 70cc cylinder and good pipe? You should be in the 90's easily, with an air box...into 105+ if just a pod filter. Which BBK? Which pipe? What is the pilot size and setting.
Do you wear different color socks? Premix fuel or pump oil?
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Post by ThaiGyro on Jun 14, 2019 5:40:47 GMT -5
Hahaha! My friend just replied! She said "fuel jet for carb? Not Chinese writing, unless crazy code". She also say Fake Trump News. Buy a good jet. That one look like formed over coat hanger. Bwaaaahahahaha!
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Post by superbrita on Jun 14, 2019 6:01:06 GMT -5
Thanks for the reply.Hahaha i thought the same.This is some kind for secret "cheat code" for faster bike  . I have stock pipe,stock filter and 4,5g rollers.On my filter box i mad a bit of modding-drilled 1 hole and removed intake pipe and instantly got more power.I will look for a new jet.I also get a spark knock at full throttle when engine is hot could it be from this stupid jet. |
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Post by geoffh on Jun 14, 2019 15:09:05 GMT -5
The mad mod you made to the air box will have leaned the mixture and your engine may be over heating,read up in the tech section.
Geoff
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Post by superbrita on Jun 14, 2019 15:49:37 GMT -5
Thats why im going to replace my main jet with bigger one
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mattyslimz
Scoot Enthusiast
Posts: 222
Location: Northern Virginia
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Post by mattyslimz on Jun 14, 2019 17:29:06 GMT -5
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Post by repherence2 on Jun 14, 2019 20:18:19 GMT -5
6 jets from 75-100 is like increments of 5. 75, 80, 85, 90, 95, 100. that's a broad range, but it should get you in the ball park. |
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Post by superbrita on Jun 15, 2019 2:29:04 GMT -5
i will measure what my jet sizes are.Thanks for the link
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Post by ThaiGyro on Jun 16, 2019 9:32:35 GMT -5
You/me...cannot always put down China stuff. What mattyslimz said above: Came from Shenzhen, China. Shenzhen is quite the motorcycle and car part city of Southern China. Spent many days there. It is a big shipping port, has a new massive airport, and is but a 45 minute ferry ride direct to Hong Kong, including express to the HKG airport. Word a few years ago...with the success of VW in China, that Porsche was to build a Shenzhen plant. (For China only sales) Taxes are stoooopid on car imports there. Just for fun...keep looking at Ali Express and Alibaba. The key is finding the right key words, as translations do not mix well, but they are improveing. Here is an example for De'Orto and clones...  |
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mattyslimz
Scoot Enthusiast
Posts: 222
Location: Northern Virginia
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Post by mattyslimz on Jun 16, 2019 11:27:25 GMT -5
You/me...cannot always put down China stuff. What mattyslimz said above: Came from Shenzhen, China. Shenzhen is quite the motorcycle and car part city of Southern China. Spent many days there. It is a big shipping port, has a new massive airport, and is but a 45 minute ferry ride direct to Hong Kong, including express to the HKG airport. Word a few years ago...with the success of VW in China, that Porsche was to build a Shenzhen plant. (For China only sales) Taxes are stoooopid on car imports there. Just for fun...keep looking at Ali Express and Alibaba. The key is finding the right key words, as translations do not mix well, but they are improveing. Here is an example for De'Orto and clones... Indeed Mr. ThaiGyro! There is plenty of good stuff on Ali. You do have to know what your looking for though as you mentioned their wording on specific parts is a little off. I do hope they improve that. If you have a Minerelli clone (1e40qmb) there is a lot of hard to find panels/lights on there that are otherwise hard to find here in North America. A lot of things i.e Jets, panels, body parts, speedo pucks can save you a lot of money in the long run. I tended to pass on the performance parts though, wanna-be Koso and the like. ”Qimore” seller is a good individual who has a wide selection and usually ships out the next day. Qimore’s prices are of course VERY reasonable too! |
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Post by ThaiGyro on Jun 17, 2019 8:24:31 GMT -5
More word to the wise regarding air box mods...In general, you should exercise extreme caution before mutilation of a near perfect box. I mean that! On a 2T the air dynamics have a similar, but greater effect on air-fuel "through-put". More that you urban legend, seat of the pants friends can imagine.
The issue that most have is the "NEED" to modify because Joe Blow said so. You like Joe. Please break away from that need and use your own brain to simplify the needs...
Install a BBK? OK...maybe that air box was already oversized? A smart OEM designer would! Do you know? Meaning, your 49cc had no issues (Likely) and the 70 may be spot on! Ohhh, but you did the deed and knocked her up! Too late! Now she gives birth to performance questions, or soft seizes...too many changes, some not required. Pills, condoms, viagra...
Just did a 4T 250cc upgrade...using cams from a 286cc, (CBR300R)...2mm bigger throttle body and removing the backfire screen. Stocker made 18.2 hp with OEM air box. Mods created 22.6 hp, but NOT the best head flow however. Swapped out the 250cc box and intake snorkel for the 286cc box, (much better flow design + bigger) and we saw 24.8 hp. No other changes! Honda? Not stupid! Same engine, longer stroke and a touch of cam.
BTW, that "upgrade" did not need a new ECM map, though border line...the cost was under $200 USD including shipping. (The air box was used ebay from AU) Not lean on top, but nearing lean deceleration) Bottom end torque was great! Ohh, yeah...we put a CBR pipe on it with softer bends..and made 25.3 hp!
It can be done!
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Post by christopher on Aug 19, 2019 19:10:13 GMT -5
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