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safe timing advance for cubs on pump


mike0chek

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so you can see my mods below, what is a safe amount of timiing to run with my setup running on 93oct? i have a slight hesitation really early in the first few gears and i know the drag ported cyls are not very strong down low but could a few more degrees timing help fix that? or if +4 timing the max i should go on 93oct?

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I don't think it's your timing, if your trying to get rid of a hesitation with timing I think your in dangerous waters on pump fuel . Do you know your done characteristics, compression? What pipes and carbs are you using? I've built many Cubs and even a few on pump and never had an issue even tho i would never recommend pump fuel on a cub. I've never ran more than +2 on the plate I think you'll gain more from needle selection

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sb shearer inframes, 35mm carbs with oversized bowls. i can live with the very small hesitation. bottom line i guess is i want to know is running more timing than i am now dangeous on pump fuel? years ago i ran a shee with just bolt on mods nothing internal with +5 timing on pump and the motor ran great for two summers until it lost compression so installed a 4mil

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Do u know how to read the timing marks on the ground steap, are you using a cel needle, if so might wanna try a series needle taper it's longer than a c. With 35 s I liked the dek needle on the last two cubs I built send me your cell number I wanna send u a pic of some literature I have . And no I wouldn't run more timing unless the plugs tell me too

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Do u know how to read the timing marks on the ground steap, are you using a cel needle, if so might wanna try a series needle taper it's longer than a c. With 35 s I liked the dek needle on the last two cubs I built send me your cell number I wanna send u a pic of some literature I have . And no I wouldn't run more timing unless the plugs tell me too

no cell at the moment man but if you can some how pm that to me i would love to read it. if its too much of a pain that way i understand.

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