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check your jet sizes here jetting charts

check your jet sizes here

all links are to MRAXL's fantastic site.
Many thanks

JET SIZES

David

I thought you might appreciate this info for your other H1 customers as I have spent the last few weeks playing with jetting to get my bike to run perfectly.

It’s an H1E with your pipes and Unifilters.

Ivans Needles on middle notch
Ivans needle jets (this is crucial as the ones I got with the cheap kits make the bike run poorly)
112.5 main jets
40 pilots (standard is 30 and is too lean to get good low end performance with your pipes and pod filters)
1 ¾ air screw

This bike now runs beautifully at all rev rangesJ

CONTRARY TO POPULAR BELIEF, THE NUMBER ON A JET IS NOT THE DIAMETER, IT DENOTES THE NUMBER OF CC'S PER MINUTE THAT IT CAN FLOW. WHICH IS WHY YOU SHOULD NEVER TRY TO DRILL OUT A JET TO A DIFFERENT SIZE.
HERE IS A CHART WHICH SHOWS THE ACTUAL SIZE OF THE JET IN RELATION TO ITS NUMBER ,OR FLOW RATE.

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

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