277° Re-phased 763cc Kit with Megacycle Cam:
38mm VM carbs, Megacycle camshaft, Dyna single tower single fire coils, and Wiseco 81mm pistons I milled the dome off to 9.6 to 1.
277° .MPG Movie / Audio Clip: http://www.650motorcycles.com/mov05521.mpg
I cut the ends off of a pre 1980 stock cam and then pressed the bushing and needle bearing (pair) that is in each end out. Needed for the governor rod installation in the Megacycle cam with the Newtronics ignition.
With a TDC mark for each cylinder on the crank rotor you put the timing light pickup on each plug wire and read them on the same timing tags for both cylinders. I added the left front tag to mark 40° and 45° total lead.
The cam sprocket got pressed off and on 4 times and degreed in repeatedly to get this cam timing where I want it. Performance valve springs and retainers shown.
The valve guides I lowered in the heads to clear the .440" lift Megacycle cam.
GS Suzuki copper head bolt washers on the 4 outside studs.
I installed a modified points ignition on this motor, the electronic ignitions failed. It screams now!
http://www.650motorcycles.com/277ign.html
Ceramic coated 1 3/4" Omar headpipes and new chrome classic megaphones.
I mounted the two new high performance Dyna ignition coils on each side of the bike "out in the breeze" with short high tension leads like we do on drag bikes. They are too large to fit under the stock tank properly.
763cc modified Wiseco piston domes.
A 277° firing order engine does not vibrate like the stock 360° engine, and it will pull smoothly on up the rpm scale. We can do "477" engines only (1974-1983)
http://www.650motorcycles.com/277engines.html
XS650 Cycle Links, Images & Info: Click Here!
Return To:
