REMARKS :
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with fuel pump lobe
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FOR COMPETITION APPLICATIONS ONLY. Following details must be verified:
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the camshafs must turn smooth in the cylinderhead, provide free travel by machining where needed
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distance between valve seal and retainer at full lift must be 0.6mm at least
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minimum valve spring travel of 1.0mm at full lift must be provided
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distance between valve and piston 1.0mm (pref. 1.5mm). check 5-15° before TDC on exhaust, and after TDC on intake
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WHEN USING THE STD VALVE SPRINGS, it is required to check the individual coil bind lengths.
In most engines, these camshafts will work with the original valve springs. However, the coil bind lengths of individual valve springs show differences up to 1mm, so in some engines the maximum valve lift may be critical. Moreover, different valves and valve springs setups have been used.
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XU engines: 2 different valve length steems have been used (109mm & 105mm). This has an influence on the fitted length of the valve spring.
The lower retainer supplied with the upper retainer [ref. 99331] will in most cases provide the proper fitted length of 35-36mm for the springs [ref.99859]. If not please machine or adapt the lower retainer
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ONLY for dirt track applications and pro street use with adjustable engine management or carburettors