Allens Performance Ltd.

Suzuki XF650 Freewind Special Carb Set with TPS

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

.Special Rack of CR33 Smoothbores for Suzuki XF650 Freewind CCM with TPS

What are Jets/valves/metering screws?

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.)

Float Valve

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.

Jet Size Chart

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

The wizards at Allens Performance

January 15th, 2011

Classic Motorcycle Mechanics January 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.

125 Bantam Class

March 26th, 2000

125 Bantam has become a championship contender after only 3 years development!

ab-bantam

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