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 Post subject: H2B carb questions
PostPosted: Sat Apr 01, 2017 11:07 pm 
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Joined: Thu Sep 29, 2016 4:32 am
Posts: 615
Location: Indianapolis, IN
My H2B carbs have emulsion tube 'shrouds' that are about 6mm tall, protruding into the airstream. I have a spare pair of carbs that I think are H2 or H2A, and the emulsion tube shrouds are really short, like 2mm. Is there a preference there, should I cut my tall ones down?
Jetting questions, I am running expansion chambers, have done port work and smaller squish clearance. The carbs have 100 main jets in them now, what would be a good guess to start out with? Also, raise the needles a notch or two?
Other question would be base ignition timing, standard or less timing? Thanks to all replies.

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1974 Kawasaki H2B 750, 1981 Yamaha XV750 Cafe, 1986 Kawasaki KDX200, 2003 Honda XR100, 2004 SDG140. 2006 Ninja 500R Turbo intercooled fuel injected.


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 Post subject: Re: H2B carb questions
PostPosted: Sat Apr 01, 2017 11:15 pm 
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Joined: Tue Jun 07, 2011 6:37 am
Posts: 10460
Location: Rio Rancho, New Mexico
Modding shrouds is a can of worms you do not want to open. Go up a couple of sizes on the mains, do the idle screw test for the pilot size, and raise the needles a notch to start. Leave the timing stock.

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Twist the throttle, tilt the horizon, and have a great time. What triples are all about...........


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 Post subject: Re: H2B carb questions
PostPosted: Sat Apr 01, 2017 11:26 pm 
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Joined: Thu Sep 29, 2016 4:32 am
Posts: 615
Location: Indianapolis, IN
Sounds good, thank you.

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1974 Kawasaki H2B 750, 1981 Yamaha XV750 Cafe, 1986 Kawasaki KDX200, 2003 Honda XR100, 2004 SDG140. 2006 Ninja 500R Turbo intercooled fuel injected.


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 Post subject: Re: H2B carb questions
PostPosted: Mon Apr 03, 2017 7:02 am 
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Joined: Sun Jul 31, 2011 9:09 am
Posts: 285
Location: Lowell Indiana
what is the idle screw test for pilots

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1973 Z1
1974 H2 750
1976 kz 1075cc ATP turbo


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 Post subject: Re: H2B carb questions
PostPosted: Mon Apr 03, 2017 7:42 am 
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Joined: Tue Jun 07, 2011 6:36 am
Posts: 2710
Location: Dandridge, TN, USA
Very early H2 had 2mm choke w/5FL14 needle. Then changed to 8mm w/5EJ15 needle.... I think there is a service bulletin on the change?
Finding the correct pilot jet can be found here:
http://www.kawatriple.com/manuals/carbtune/carbtune.htm

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