I’m working on putting a roller together with a wishbone frame. I was using the chart to tap all the holes clean and when I came to the coil blocks the chart called for a 3/8-24 tap but mine needed a 5/16th-18 to get the job done.
Maybe someone else can double check on there frame ?
A 3/8 bolt in that location would seem to me to be too large .
Tim
Tap chart
Tap chart typo ?
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Re: Tap chart
I don't know the year model for the change, but indeed, some are 5/16, and some are 3/8. The Colony kit for the terminal box contains both sizes of double ended studs......
....RooDog....
....RooDog....
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Re: Tap chart
Ok, so it has been confirmed. According to Colony manufacturing parts book all 45 and big twins from 1948-1955 have the 5/16-18 thread in the coil mount and for the big twins from 1956-1982 have a 3/8-24 thread in the coil mount.
So the start of the pan straight leg frame in 1956 was where the change was made.
I am working on a 57 project bike and a Wishbone roller at the same time and checked both. They are as per mentioned above.
So that difference should be added to the tap chart.
So the start of the pan straight leg frame in 1956 was where the change was made.
I am working on a 57 project bike and a Wishbone roller at the same time and checked both. They are as per mentioned above.
So that difference should be added to the tap chart.
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- Senior Member
- Posts: 5327
- Joined: Tue Oct 31, 2017 1:00 pm
- Bikes: 1950 Panhead, Resto-Mod
1968 90", 5 Speed Shovelhead,
1984 Home Built Custom Evo 100" Bagger - Location: Knoxville, Tennessee
- Has thanked: 2801 times
- Been thanked: 2159 times