277 Degree Rephase Ignition Instructions

For a detailed step-by-step walk through, see the writeup by Hugh Owings.

Installation Guide

The 277 rephase application can be used for either the 277 or the so called 443 timing. The rotor has two slots so that it can be installed to accommodate either cam timing scheme, but you have to be able to determine the correct timing for your particular engine.

The picture is with the locating pin in the advance rod at the 12 O'clock position. The cylinder (left) that is on its compression stroke, nearing TDC, will fire now. The other cylinder will fire 277 crankshaft degrees later. (Ensure that the locating pins are not 180 degrees out of phase.)


If your cam shaft was split to rephase it, then you will probably have this timing, also known as the 443 degree timing. The latest rotor has an alternate locating slot for this application

Rotor in 443 Timing

There are at least 4 ways to install the advance mechanism and two ways to build a cam for the 277 conversion so that means that there are at least 8 ways to install the ignition system times the two ways to install the rotor, so that makes 16 ways to install the ignition system, and only one of them is correct for your engine. The best way to ensure success is to methodically "walk" the crank shaft around for at least 720 degrees and check that each cylinder will get it's spark at the correct time.

Wiring for the single output "Green Monster" Part #17-6807 coil. Here is a picture of the coil. The green wire is negative and goes to the green wire on the ignition coil. The red wire goes to your source of switched battery (kill switch) and it is positive.


Home | Standard Ignition for the XS650 Instructions | Ignition Coil Testing | Electronic Ignition with E-advancer Instructions | Ignition Instructions for the XS400 | 277 Degree Rephase Instructions

Webspace Provided By Mikes XS, The XS650 New OEM & Vintage Parts Supply Warehouse.