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Thank you for the information, I will compare the 6Sigma jet bore sizes to the standard jets and see where that takes me.

Here are the fitting instructions for the 6Sigma kit.

Thank you for your reply, 6Sigma says to use a 160 or 170 main jet, I am thinking this would not help fuel economy? The exhaust is aftermarket, Inch and three quarter diameter pipes and the mufflers are Supertrapp with a 22mm diameter hole in the outlet they are not using the original stackable...

Hi All, I just wanted some info on carby jets. My 1989 Gen1 VMAX is chewing too much fuel, almost 11 Liters to 60 Kilometers travel but that is in peak hour traffic no highway cruising I ordered a 6 Sigma Jet kit (Stage 1-2-3) but the main jets supplied are a 160 or 170 to choose from. I...

Hi MaxMidnight, Thanks for your response, sorry about the typo it should be cyl 4, It seems to run fine I've re-built carby No1 six times now so looks like I will have to give it another go.

Should the vacuum applied to the Boost Sensor slowly run down (Leak) after being applied to the sensor input tube?

I have a question about carburettors on my 1989 VMAX . I have rebuilt them 5 times the last time I ran all the parts through a heated ultrasonic cleaner . After fitting back on the bike I did the balance procedure and then adjusted the idle mixture screws . Carbies 2-3&5 were easy to set but the...