Service Manual
Page 16 of 50

*NOTE* This service manual is for a NON EN10 modified engine. Whilst most of the information is relevent, there are some critical differences.
For more information on EN10 modified engines, please contact
Mick Broom at Broom Development Engineering on +44 (0)1327 353023

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Examine the chain guides for wear and renew as necessary. The guides should be renewed when the grooves made by the chains are deeper than 2mm. Premature wear is a sign of incorrect camchain adjustment.
To remove the camchain case release the six socket screws (5mm Allen key) holding the chain case to the cylinder head; and the five socket screws (4mm Allen key) holding the chain case to the crankcase. With the engine in the frame, access to the central screw behind the rear case can be gained by using an extended 1J4" drive bit, (Special Tool No. 8229) and a flexible extension. Removal of the remaining screws is simplified by the use of the same tool. To remove the rear chain case with the engine in the frame, it is also necessary to extract the exhaust cam shaft (page 21).
The drive for the front cylinder can be released by following the procedure for removing the mechanism of the rear cylinder. However, in this instance both cam shafts must be removed from the head (page 22), in order to detach the camchain case with the engine in the frame. It has already been noted that the oil pump gear must also be removed.
Remove the crankshaft pinion which is retained by a right hand threaded nut, (32mm spanner). It may be removed with the, engine in the frame by putting the machine into gear and holding the rear brake on. With the engine removed from the frame, the crankshaft may be held using the clutch holding tool to lock the crankshaft (Special Tool No. 8017).. Do not use a hammer when loosening or tightening either of the crankshaft nuts.

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