Disclaimer: All information within this document is believed to be correct and is given in good faith, the author is not liable for any damage that may be caused using this information. If you are in any doubt, then take it to an approved dealer or tuning specialist.

Time your cams up with regard to the chain as

with the slotted sprockets in the midway position,set the bike at TDC using the timing mark from the igniter pick up (see blown up view in timing picture) having bought yourself a timing disc attach this to the end of your crankshaft, make a pointer with a point on the end and attach this using a clutch casing bolt and set at zero. Checking TDC. Wind the bike round in the normal direction (CW) until about 40° Before TDC. Fit a positive stop into the spark plug hole on No1 piston (assumption made is that you've removed all spark plugs to make it easy to turn over!), If you don't have one make one by breaking up an old spark plug remove all the gubbinns, drill and tap it M8 and fit a long bolt. At this 40° point wind the bolt in gently till you feel it touch the piston. Carefully wind the engine backwards and read what the disc say, if all is spot on the it should read 40° After TDC if not split the difference and move the degree disc backwards or forwards that amount, ie: 38° ATDC move the disc forward to 39°ATDC, then wind the engine forward and check what it reads should be 39°BTDC. Having done this lock up the timing disc and remove the stop. Fit a dial guage indicator which has at least 25mm of travel so it is resting on top of the spring on the inlet valve, allow about 12mm travel either way. (You'll need to make a jig up to mount it it off a cam cover bolt) with valve closed.
Rotate engine until valve is 1.27mm(.050") off seat and write down reading on degree wheel. Continue to rotate engine until valve is 1.27mm (.050") from closing. Note the number. To figure lobe center for intake cam subtract opening number from closing number, divide difference by two and add that number to 90. For the exhaust subtract the closing number from the opening number and follow the same formula. Inlet should be 105° and Exhaust 107°. If you want more bottom-end torque, advance your exhaust cam by 2 degrees. If you want more top-end, then advance the intake cam by 2 degrees. The adjustment is made by slackening the bolts on the sprockets and allowing the sprocket to turn slightly in relation to the fixed cam (ie: the chain is pulling the sprocket round. When Happy tighten the bolts holding the sprockets in place up very tight and loctite in place (thread Adhesive). With the pistons for 1-4 on top dead centre, the dial guage on the valve spring manually push the valve down untill you feel it gently come into contact with the piston top, the distance travelled on the dial guage should be at least 1.27mm (.050") plus. If not check your cam timing and re-check, if you don't get at least this clearence you've got something wrong.

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