auzziejim
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| posted on 17/10/06 at 06:38 PM |
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jetting mikuni carbs
need a little help in jetting my bike carbs, taking off the float bowls i think im right when i assume the largest screw in the middle of the float
chamber is the main jet and its this that needs drilling out.
cheers
james
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takumi
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| posted on 17/10/06 at 06:52 PM |
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1.6-1.7mm main jets
redrill to 1.6-1.7mm
I am using 1.6mm drilled jets on my Mikuni BSR34 carbs pinto running , works great. I suppose if you are using larger carbs 36mm+ I would go for
1.7mm just to prevent the greater flow from running lean.
The drill cost me a few quid tho.. might be worth checking drills at model shops, they might have 0.1mm increments..
tak
RobinHood 2B 2.0i pinto, Keihin 38mm Carbs, lightened flywheel, O'Mori remote filter kit, 10 row oil cooler. Modified head, 10.2cr, special
valves FR22 cam, 4- 1 header.
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Peteff
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| posted on 17/10/06 at 07:57 PM |
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Rolson do some small indexed drill sets that go up to 1.6mm. I use them in a dremmel type drill. They were from the flea market tool stall and only
cost a few quid.
Some here on ebay but mine were cheaper.
[Edited on 17/10/06 by Peteff]
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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auzziejim
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| posted on 17/10/06 at 08:01 PM |
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i have the drill but im just unsure of what i need to drill and am afraid of screwing up.
i have uploaded a pic to my archive named bike carbs i think i need to drill the large screw in the middle of the 3 together with a hex head below
it...am i right?
cheers
james
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Coose
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| posted on 17/10/06 at 08:15 PM |
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New jets are only a couple of quid each! A 160 Mikuni jet is 1.6mm, a 170 1.7mm etc....
Believe this if you will - my 250cc v-twin Grand Prix bike came with 560 main jets! That's 5.6mm on a 125cc cylinder!!!! 
I now run around 400's, which is still obviously 4mm!
Spin 'er off Well...
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oliwb
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| posted on 17/10/06 at 08:24 PM |
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I use 175's in my mikuni carbs on a 1.6 pinto. Yes the bit you are reffering to IS the main jet. Just wait till you get onto setting the
needle height etc....thats where the fun begins! Oli.
If your not living life on the edge you're taking up too much room!
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auzziejim
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| posted on 17/10/06 at 08:26 PM |
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pray tell then oli  how do i go abouts setting the needle height?
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takumi
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| posted on 17/10/06 at 08:54 PM |
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take the top off..
take the top off the carb..
The needle height is set by a tiny circlip and spacers in 1 of 4 grooves at the top of the needle - and hence adjust the height it sits at... you take
off the top of the carb -beware that it is which is under spring pressure.. once off, you can lift out the diaphragm and slide choke mechanism.. the
needle is mounted in the slide
the needle is held in place with a push in/pull out friction clip, and is easily plucked out with needle nose pliers and just as easily pushed back
in.... the rest should be very obvious, with regard to adjusting the height. I would only move it 1 groove at a time, and see how it performs..
atb
tak
RobinHood 2B 2.0i pinto, Keihin 38mm Carbs, lightened flywheel, O'Mori remote filter kit, 10 row oil cooler. Modified head, 10.2cr, special
valves FR22 cam, 4- 1 header.
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triumphdave
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| posted on 18/10/06 at 12:21 AM |
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Is the main jet the only jet that needs drilling?,if so I assume its a combination of that the needle height and mixture screw, is that right.
If you always do what you have always done you will always get what you have always got
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