Author Topic: Main Jets  (Read 2431 times)

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Motorrad

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Main Jets
« on: July 29, 2011, 05:33:42 PM »
Has anyone else noticed the differance between ORIGINAL Keihin Main jets and the aftermarket ones (think they are sudco (stamped with a AB 168 (jet number)...

 :|

Yet another thing to drive me NUTS  :x

Offline Friar-Tuck

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Re: Main Jets
« Reply #1 on: July 29, 2011, 07:47:39 PM »
Yes,
  There are several other jet manufacturers, Kehin and mikuni originals are all flowed.
   They are more expensive however they are more accurate.  I have had three occasions the off brand jet was the culprit.
     Tuck\o/
« Last Edit: July 30, 2011, 06:31:13 AM by Friar-Tuck »
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Motorrad

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Re: Main Jets
« Reply #2 on: July 30, 2011, 04:48:39 AM »
Good point Tuck..

I was reffering to actuall PHYSICAL design differance..

On Keihin branded jets, there is a Taper at the bottom of the threads (base) that seats into the carb..

On the AB ones I have... it is Straight cut.. and never feels like it bottoms in the carb... Just when it feels like ti does, the threads bust.. (I have never busted main jet's before I bought these ones)...

Also the external dimentions are the same... except for that taper, which on the AB jet.. is taller..

Offline Friar-Tuck

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Re: Main Jets
« Reply #3 on: July 30, 2011, 06:40:39 AM »
And I also hadn't broken any Keihin's or Mikuni in carbs.

 Imagine my surprised when I snapped the main on a brand new 450CRF with the jets the owner bought for the project.
I had been surfing for what seemed to be the best bet and the owner bought the jets with the understanding I would help.
  (I wanted to go with JD but he wanted more jet for his money, oh well)
Brother my heart sank when I felt that snap. 
 I luckily had an easy out small enough to get the buggard jet out and used one of the Keihins I had from my box....
I wasn't even sure they would fit.   

 lesson 1: Use the torque wrench
          2 :  buy the good stuff
          3 :  FCR Jets are Same as PWK
  Tuck\o/
"The Truth Has No Agenda"

Offline Polar-Bus

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Re: Main Jets
« Reply #4 on: August 03, 2011, 11:30:34 AM »
I buy nothing but OEM jets. While I cannot comment about direct experience, a buddy of mine had issues with EBC aftermarket clone jets not achieving correct desired jet change results.
01' KX500
'84 GPz1100
'87 GSX-R  750
'06 HD Fatboy
'73 Kawi H1
'03 CRG KX500 Shifter kart