December 15th, 2014
Another job to keep the Allens workshop busy! Not the billet Throttle position sensor adaptor on this special rack of smoothbore Keihin CR33 carbs for a Suzuki XF650 Freewind engine powered CCM. Pictured here next to the original Mikuni BSR CV carbs
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December 10th, 2014
Jet: A component controlling flow of a fluid, restricting by means of a calibrated orifice size. In the case of a carburettor this fluid could be fuel or air.
Float Valve: A component designed to allow or prevent the flow of fuel. A float valve prevents fuel flow when the level in your float chamber is correct. Exactly like your toilet cistern.
Metering Screw: A tapered screw allowing adjustable flow restriction of fluid. (In this case fuel and/or air.)
November 26th, 2014
The function of this part is to maintain a consitant fuel level in your carburettor float chamber. As the fuel drops the floats will sink, opening the valve and allowing more fuel to pass through.
November 21st, 2014
| Jet Size CC/Min | Jet bore |
| 10 | 0.273 |
| 15 | 0.335 |
| 20 | 0.387 |
| 25 | 0.432 |
| 30 | 0.474 |
| 35 | 0.511 |
| 40 | 0.547 |
| 45 | 0.580 |
| 50 | 0.611 |
| 55 | 0.641 |
| 60 | 0.670 |
| 65 | 0.697 |
| 70 | 0.723 |
| 75 | 0.749 |
| 80 | 0.773 |
| 85 | 0.797 |
| 90 | 0.820 |
| 95 | 0.843 |
| 100 | 0.865 |
| 105 | 0.886 |
| 110 | 0.907 |
| 115 | 0.927 |
| 120 | 0.947 |
| 130 | 0.986 |
| 140 | 1.023 |
| 150 | 1.059 |
| 160 | 1.094 |
| 170 | 1.127 |
| 180 | 1.160 |
| 190 | 1.192 |
| 200 | 1.223 |
| 210 | 1.253 |
| 220 | 1.282 |
| 230 | 1.311 |
| 240 | 1.339 |
| 250 | 1.367 |
| 260 | 1.394 |
| 270 | 1.421 |
| 280 | 1.447 |
| 290 | 1.472 |
| 300 | 1.498 |
| 310 | 1.522 |
| 320 | 1.547 |
| 330 | 1.571 |
| 340 | 1.594 |
| 350 | 1.617 |
| 360 | 1.640 |
| 370 | 1.663 |
| 380 | 1.685 |
| 390 | 1.707 |
| 400 | 1.729 |
| 410 | 1.751 |
| 420 | 1.772 |
| 430 | 1.793 |
| 440 | 1.814 |
| 450 | 1.834 |
| 460 | 1.854 |
| 470 | 1.874 |
| 480 | 1.894 |
| 490 | 1.914 |
| 500 | 1.933 |
| 510 | 1.953 |
| 520 | 1.972 |
| 530 | 1.990 |
| 540 | 2.009 |
| 550 | 2.028 |
| 560 | 2.046 |
| 570 | 2.064 |
| 580 | 2.082 |
| 590 | 2.100 |
| 600 | 2.118 |
| 610 | 2.135 |
| 620 | 2.153 |
| 630 | 2.170 |
| 640 | 2.187 |
| 650 | 2.204 |
| 660 | 2.221 |
| 670 | 2.238 |
| 680 | 2.255 |
| 690 | 2.271 |
| 700 | 2.287 |
| 710 | 2.304 |
| 720 | 2.320 |
| 730 | 2.336 |
| 740 | 2.352 |
| 750 | 2.368 |
| 760 | 2.384 |
| 770 | 2.399 |
| 780 | 2.415 |
| 790 | 2.430 |
| 800 | 2.445 |
| 820 | 2.476 |
| 840 | 2.506 |
| 860 | 2.535 |
| 880 | 2.565 |
| 900 | 2.594 |
| 950 | 2.665 |
| 1000 | 2.734 |
| 1050 | 2.802 |
| 1100 | 2.868 |
| 1150 | 2.932 |
| 1200 | 2.995 |
| 1250 | 3.057 |
| 1300 | 3.117 |
| 1350 | 3.177 |
| 1400 | 3.235 |
| 1500 | 3.349 |
| 1600 | 3.458 |
| 1700 | 3.565 |
| 1800 | 3.668 |
| 1900 | 3.769 |
| 2000 | 3.867 |
| 2100 | 3.962 |
| 2200 | 4.055 |
| 2300 | 4.146 |
| 2400 | 4.236 |
| 2500 | 4.323 |
January 15th, 2011
Here at Allens Performance we are pleased as punch to be featured in this month’s Classic Motorcycle Mechanics magazine. Here’s how the article starts…
“Intricate detailed and demanding: there’s a real black art about the carburettor, but not to the wizards at Allens Performance.”
Words: Bertie Simmonds Pictures: Joe Dick
Classic Motorcycle Mechanics – January 2011 (Download the 6 page article here in PDF format)
Visit www.classicmechanics.com for more from this excellent publication.
March 26th, 2000
125 Bantam has become a championship contender after only 3 years development!
