After buying a new pilot jet size 30 to replace the 25 that appears too small , I find the 30 is far smaller than the 25 ! .looks like I will be making my own . What exactly does the 30 represent . perhaps 3 thou ?.
25 and 30 refer to the flow…
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Thanks John, I suspect…
Thanks John, I suspect that I will have to drill out to 18 thou to get somewhere close.
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Hi Robert. Also make sure…
Hi Robert. Also make sure that the jets are genuine Amal. I’ve had some non-genuine ones that are a mile out of spec. The genuine ones have rectangular cut-outs across the hex sides of the jet.
Regards
Tony
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All of this is worth knowing…
All of this is worth knowing, thanks for posting the question and the responses
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After a close examination of…
After a close examination of my new 30 pilot , I think its a pattern part and I have had to pass an 18 thou bit through it to clear away swarf. . I will let you know how it runs and if it helps the by pass supply deal better with the progression from pilot to slide cutaway.
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pilot jet
Well that worked. The uneven and unreliable idle has gone and the spit back with it. whether its due to the bigger pilot or perhaps a minor restriction in the 25 its hard to say. A session with the colourtune and a warmed up motor is next. Its only taken a whole riding season to sort this, what chance anything complicated?.
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25 and 30 refer to the flow rate in ml. So the 25 flows 25ml of fuel per min.
In fact the flowrate for pilot jets can be equated to a size, 25 jet is 17 thou, 30 jet is 19 thou. Once you get to main jets then exact sizes cannot be set to a size as the shape of the hole and markings from the drill cutting have an affect so flow rate is the sole measure.