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Old 03-03-2015, 02:07 AM   #61
SpudRider   SpudRider is offline
 
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Originally Posted by hect75 View Post
Spud, the main jet 132 in of mv28 is equivalent to what keihin or mikuni size? The main jet does not have any mark on it only 132.

Saludos
The stock, size 132, Teikei main jet is roughly equivalent to a size 130, Mikuni main jet. Therefore, to enrich your mixture, begin experimenting with a size 132.5, Mikuni main jet.
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2015 Zongshen ZS250GY-3 (RX3)
2006 Zongshen ZS200GY-2 (Sierra 200)
2005 Honda XR650L
2004 Honda CRF250X
1998 Kawasaki KDX220

Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894


 
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Old 03-03-2015, 10:19 AM   #62
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Originally Posted by hect75 View Post
Still white but using the original mainjet (used drill bit 1/16").
I think the drilled jet is so large, that not enough fuel is drawn into the air stream. A venturi requires a narrow range of sizes, and I believe that 1/16" is far too large. When you try the jet that Spud has recommended, I bet the colour will improve. White is dangerous.
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Old 03-03-2015, 05:47 PM   #63
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Quote:
Originally Posted by SpudRider View Post
The stock, size 132, Teikei main jet is roughly equivalent to a size 130, Mikuni main jet. Therefore, to enrich your mixture, begin experimenting with a size 132.5, Mikuni main jet.
After installing a keihin 140 and rode 20 miles did the plug chop, know is black. I think will try with the 138.



Some pics of my vento at the work (in the middle of the Chihuahuan desert), someday will paint the plastics in black or white. As you can see, the DT gas tank is a bit bigger than the stock one. I don´t like the space between the saddle and plastic but, again, someday will fix it.



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Old 03-03-2015, 07:25 PM   #64
SpudRider   SpudRider is offline
 
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You did a nice job; your Zong/Vento looks good.

Indeed, that plug is very black. I think a size 132.5 Mikuni jet will be just about right.
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"Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain

2015 Zongshen ZS250GY-3 (RX3)
2006 Zongshen ZS200GY-2 (Sierra 200)
2005 Honda XR650L
2004 Honda CRF250X
1998 Kawasaki KDX220

Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894


 
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Old 03-03-2015, 09:47 PM   #65
Weldangrind   Weldangrind is offline
 
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Your bike looks really good. That black plug is much safer. I agree with Spud on the 132.5.
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Old 03-04-2015, 01:56 PM   #66
hect75   hect75 is offline
 
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Originally Posted by Weldangrind View Post
Your bike looks really good. That black plug is much safer. I agree with Spud on the 132.5.
I´ve been doing my research and found that mikuni 132.5 = Keihin 150 or 155 (don´t remember). Is this true? if so, need to visit all motorcycle store because some stores only sell jets for 125cc. Only Yamaha, Honda, Suzuki and Kawa could sell the main jet but not sure if will find the 150 or 155 Keihin or even Mikuni. Anyway I will check and hope I could find it.

Saludos Chineros
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Old 03-04-2015, 02:29 PM   #67
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Good looking bike! I like the tank swap.

That black plug would be a relief if it was white/hot before. The exhaust header paint looks like it was heating up quite a bit? Good to know the Keihin jets can work in the TK.
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Old 03-04-2015, 03:20 PM   #68
Weldangrind   Weldangrind is offline
 
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Quote:
Originally Posted by hect75 View Post
I´ve been doing my research and found that mikuni 132.5 = Keihin 150 or 155 (don´t remember). Is this true?
I don't know the answer. The bottom line is that your engine is much safer now, so all you need to do is find a smaller jet that creates a tan / grey colour.
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Old 03-04-2015, 08:38 PM   #69
SpudRider   SpudRider is offline
 
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Quote:
Originally Posted by hect75 View Post
I´ve been doing my research and found that mikuni 132.5 = Keihin 150 or 155 (don´t remember). Is this true? if so, need to visit all motorcycle store because some stores only sell jets for 125cc. Only Yamaha, Honda, Suzuki and Kawa could sell the main jet but not sure if will find the 150 or 155 Keihin or even Mikuni. Anyway I will check and hope I could find it.

Saludos Chineros
Quote:
Originally Posted by dh View Post
Good looking bike! I like the tank swap.

That black plug would be a relief if it was white/hot before. The exhaust header paint looks like it was heating up quite a bit? Good to know the Keihin jets can work in the TK.
I seriously doubt the Keihin jets will fit the Teikei carburetors. Therefore, I really don't know how the jet sizes compare.

The Minkuni jets are uniformly employed by the TW200 owners who have the same engines and carburetors as we Zongshen owners. Therefore, I think it is best to stick with the Mikuni jets, where all the information has been verified and tested.
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"Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain

2015 Zongshen ZS250GY-3 (RX3)
2006 Zongshen ZS200GY-2 (Sierra 200)
2005 Honda XR650L
2004 Honda CRF250X
1998 Kawasaki KDX220

Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894


 
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